Colorado business filing dates, 2027

State-level due dates for businesses filing in Colorado. Every line links to the official page it came from, with the date that page was read. Where no official source has been verified, the line says so instead of showing a date.

Add to Google Calendar Add to Apple or Outlook Download .ics36 dated lines in the calendar file · sources last read 2026-09-23

Income / franchise tax return

2 dates

The annual return for the business’s tax year, and in franchise-tax states the report that keeps the entity in good standing. Which form and which date depend on the entity type and the tax year. Where the source grants an extension, it extends the time to file; the source says whether it also extends the time to pay.

Obligation	Applies to	Due rule	2027 dates	Source · retrieved
Form DR 0106 partnership / S corporation returncalendar-year S corporation or partnership Source text “You must file this return and pay any amount owed by the fifteenth day of the fourth month after the close of the tax year, which is April 15 for calendar year filers. For filing your return there is an automatic extension of six months, or until October 15 for calendar year filers. However, no extension is available for payment. To make an extension payment before filing, see form DR 0158-N in this book. If the due date falls on a weekend or legal holiday, return will be due the next business day.”verbatim · tax.colorado.gov · retrieved 2026-09-23 “(3) If the date for filing any report, claim, tax return, statement, remittance, or other document falls upon a Saturday, Sunday, or legal holiday, it shall be deemed to have been timely filed if filed on the next business day.”verbatim · C.R.S. §39-21-119(3) · olls.info · retrieved 2026-09-26	Applies toA partnership or S corporation files and pays by the 15th day of the 4th month after its tax year closes (April 15 for calendar-year filers). Filing is automatically extended six months (October 15); payment is not. Weekend and legal-holiday dates move to the next business day.	Due ruleDR 0106: 15th day of the 4th month after the tax year endsIf this date falls on a Saturday, Sunday or a Colorado legal holiday, it moves to the next business day — C.R.S. §39-21-119(3). Not every such holiday is compiled: Days appointed or recommended by the Governor or the President as a day of fasting or prayer or thanksgiving (§24-11-101(1)) are not listed. Public-office closure days are not listed: §24-11-110 continues only a document due at a closed public office (not a remittance), while this set's authority (§39-21-119(3)) also rolls remittances, so a closure day in this list would move a remittance later than the law does — e.g. the Department of Revenue's published closure on Friday, July 3, 2026 is left out.olls.info/crs/crs2026-title-39.htm (official source, opens in a new tab)retrieved 2026-09-26 · C.R.S. §39-21-119(3)	2027 dates Apr 15ThuDR 0106extended: Oct 15 State legal holidays are not compiled: if this date is a state holiday, the deadline moves to the next business day.	Source · retrievedtax.colorado.gov/sites/tax/files/documents/DR0106_2025.pdf (official source, opens in a new tab)retrieved 2026-09-23
Form DR 0112 C corporation returncalendar-year C corporation Source text “Colorado C Corporation Income Tax Returns are due on the 15th day of the fifth month following the close of the tax year. For calendar year filers, returns are due May 15th of the next year. All C corporations are allowed an automatic six-month extension for filing of their income tax returns. If either the regular or extended due date falls on a Saturday, Sunday, or legal holiday, the due date will be extended to the next business day.”verbatim · tax.colorado.gov · retrieved 2026-09-23 “For filing there is an automatic extension of six months, or until November 15 for calendar year filers, but no extension is available for payment.”verbatim · tax.colorado.gov · retrieved 2026-09-23 “(3) If the date for filing any report, claim, tax return, statement, remittance, or other document falls upon a Saturday, Sunday, or legal holiday, it shall be deemed to have been timely filed if filed on the next business day.”verbatim · C.R.S. §39-21-119(3) · olls.info · retrieved 2026-09-26	Applies toA C corporation files and pays by the 15th day of the 5th month after its taxable year closes (May 15 for calendar-year filers). Filing is automatically extended six months (November 15 for calendar-year filers); payment is not. Weekend and legal-holiday dates move to the next business day.	Due ruleDR 0112: 15th day of the 5th month after the tax year endsIf this date falls on a Saturday, Sunday or a Colorado legal holiday, it moves to the next business day — C.R.S. §39-21-119(3). Not every such holiday is compiled: Days appointed or recommended by the Governor or the President as a day of fasting or prayer or thanksgiving (§24-11-101(1)) are not listed. Public-office closure days are not listed: §24-11-110 continues only a document due at a closed public office (not a remittance), while this set's authority (§39-21-119(3)) also rolls remittances, so a closure day in this list would move a remittance later than the law does — e.g. the Department of Revenue's published closure on Friday, July 3, 2026 is left out.olls.info/crs/crs2026-title-39.htm (official source, opens in a new tab)retrieved 2026-09-26 · C.R.S. §39-21-119(3)	2027 dates May 17MonDR 0112 · moved from Sat May 15extended: Nov 15 State legal holidays are not compiled: if this date is a state holiday, the deadline moves to the next business day.	Source · retrievedtax.colorado.gov/corporate-income-tax-guide (official source, opens in a new tab)retrieved 2026-09-23tax.colorado.gov/sites/tax/files/documents/DR0112_2025.pdf (official source, opens in a new tab)retrieved 2026-09-23

Form DR 0106 partnership / S corporation returncalendar-year S corporation or partnership

Source text

“You must file this return and pay any amount owed by the fifteenth day of the fourth month after the close of the tax year, which is April 15 for calendar year filers. For filing your return there is an automatic extension of six months, or until October 15 for calendar year filers. However, no extension is available for payment. To make an extension payment before filing, see form DR 0158-N in this book. If the due date falls on a weekend or legal holiday, return will be due the next business day.”verbatim · tax.colorado.gov · retrieved 2026-09-23

“(3) If the date for filing any report, claim, tax return, statement, remittance, or other document falls upon a Saturday, Sunday, or legal holiday, it shall be deemed to have been timely filed if filed on the next business day.”verbatim · C.R.S. §39-21-119(3) · olls.info · retrieved 2026-09-26

Applies toA partnership or S corporation files and pays by the 15th day of the 4th month after its tax year closes (April 15 for calendar-year filers). Filing is automatically extended six months (October 15); payment is not. Weekend and legal-holiday dates move to the next business day.

Due ruleDR 0106: 15th day of the 4th month after the tax year endsIf this date falls on a Saturday, Sunday or a Colorado legal holiday, it moves to the next business day — C.R.S. §39-21-119(3). Not every such holiday is compiled: Days appointed or recommended by the Governor or the President as a day of fasting or prayer or thanksgiving (§24-11-101(1)) are not listed. Public-office closure days are not listed: §24-11-110 continues only a document due at a closed public office (not a remittance), while this set's authority (§39-21-119(3)) also rolls remittances, so a closure day in this list would move a remittance later than the law does — e.g. the Department of Revenue's published closure on Friday, July 3, 2026 is left out.olls.info/crs/crs2026-title-39.htmretrieved 2026-09-26 · C.R.S. §39-21-119(3)

2027 dates

Apr 15ThuDR 0106extended: Oct 15

State legal holidays are not compiled: if this date is a state holiday, the deadline moves to the next business day.

Source · retrievedtax.colorado.gov/sites/tax/files/documents/DR0106_2025.pdfretrieved 2026-09-23

Form DR 0112 C corporation returncalendar-year C corporation

Source text

“Colorado C Corporation Income Tax Returns are due on the 15th day of the fifth month following the close of the tax year. For calendar year filers, returns are due May 15th of the next year. All C corporations are allowed an automatic six-month extension for filing of their income tax returns. If either the regular or extended due date falls on a Saturday, Sunday, or legal holiday, the due date will be extended to the next business day.”verbatim · tax.colorado.gov · retrieved 2026-09-23

“For filing there is an automatic extension of six months, or until November 15 for calendar year filers, but no extension is available for payment.”verbatim · tax.colorado.gov · retrieved 2026-09-23

“(3) If the date for filing any report, claim, tax return, statement, remittance, or other document falls upon a Saturday, Sunday, or legal holiday, it shall be deemed to have been timely filed if filed on the next business day.”verbatim · C.R.S. §39-21-119(3) · olls.info · retrieved 2026-09-26

Applies toA C corporation files and pays by the 15th day of the 5th month after its taxable year closes (May 15 for calendar-year filers). Filing is automatically extended six months (November 15 for calendar-year filers); payment is not. Weekend and legal-holiday dates move to the next business day.

Due ruleDR 0112: 15th day of the 5th month after the tax year endsIf this date falls on a Saturday, Sunday or a Colorado legal holiday, it moves to the next business day — C.R.S. §39-21-119(3). Not every such holiday is compiled: Days appointed or recommended by the Governor or the President as a day of fasting or prayer or thanksgiving (§24-11-101(1)) are not listed. Public-office closure days are not listed: §24-11-110 continues only a document due at a closed public office (not a remittance), while this set's authority (§39-21-119(3)) also rolls remittances, so a closure day in this list would move a remittance later than the law does — e.g. the Department of Revenue's published closure on Friday, July 3, 2026 is left out.olls.info/crs/crs2026-title-39.htmretrieved 2026-09-26 · C.R.S. §39-21-119(3)

2027 dates

May 17MonDR 0112 · moved from Sat May 15extended: Nov 15

State legal holidays are not compiled: if this date is a state holiday, the deadline moves to the next business day.

Source · retrievedtax.colorado.gov/corporate-income-tax-guideretrieved 2026-09-23tax.colorado.gov/sites/tax/files/documents/DR0112_2025.pdfretrieved 2026-09-23

Estimated tax

no fixed date

Installments paid during the year toward the year’s tax. Whether a business must pay them depends on its expected liability, which this page cannot know; the lines show when installments fall due for those who must.

Obligation	Applies to	Due rule	2027 dates	Source · retrieved
Corporate estimated tax (DR 0112EP) Source text “If next year’s Colorado tax liability will be greater than $5,000 after subtracting credits, you must make estimated tax payments using the DR 0112EP. For more information, see Part 9 of the Corporate Income Tax Guide.”verbatim · tax.colorado.gov · retrieved 2026-09-23	Applies toA corporation whose next-year Colorado tax will exceed $5,000 after credits must pay estimated tax on Form DR 0112EP. The installment dates are not stated on this source, so none are shown.	Due ruleNo date: see the source text	2027 dates—	Source · retrievedtax.colorado.gov/sites/tax/files/documents/DR0112_2025.pdf (official source, opens in a new tab)retrieved 2026-09-23
Electing pass-through entity estimated tax Source text “electing pass-through entities are subject to the same requirements for estimated tax payments as C corporations. In general, an electing pass-through entity must remit four quarterly estimated tax payments if its net Colorado tax liability for the tax year exceeds $5,000.”verbatim · tax.colorado.gov · retrieved 2026-09-23	Applies toAn electing pass-through entity (SALT Parity Act) makes four quarterly estimated payments, like a C corporation, when its net Colorado tax for the year exceeds $5,000. The installment dates are not stated on this source.	Due ruleNo date: see the source text	2027 dates—	Source · retrievedtax.colorado.gov/sites/tax/files/documents/ITT_SALT_Parity_Act_Feb_2024.pdf (official source, opens in a new tab)retrieved 2026-09-23

Withholding

1 date

Returns and deposits of income tax withheld from employees’ wages. The agency assigns each employer a deposit frequency, usually from its past liability, so the dates differ by frequency.

Obligation	Applies to	Due rule	2027 dates	Source · retrieved
W-2 filing with the Department (paper filers: DR 1093 transmittal) Source text “Every employer that is subject to Colorado wage withholding requirements must file with the Department any W-2 reporting Colorado wages or Colorado withholding. The required W-2s for any calendar year must be filed with the Department on or before January 31st of the following year.”verbatim · tax.colorado.gov · retrieved 2026-09-23	Applies toAn employer the preparer attests is subject to Colorado wage withholding files its W-2s reporting Colorado wages or withholding with the Department by January 31 of the following year (paper filers attach the DR 1093 transmittal). The source states no weekend rule for this filing, so the stated date is shown.	Due ruleDR 1093: January 31 of the year after the calendar year ends	2027 dates Jan 31SunDR 1093 Falls on a Sunday; the source states no weekend rule.	Source · retrievedtax.colorado.gov/withholding-tax-guide (official source, opens in a new tab)retrieved 2026-09-23
Wage withholding filing frequency Source text “Quarterly \| Less than $7,000 \| Each calendar quarter ending March 31st, June 30th, September 30th, and December 31st \| Last day of the month following the close of the calendar quarter”verbatim · tax.colorado.gov · retrieved 2026-09-23 “Monthly \| At least $7,000, but not more than $50,000 \| Each calendar month \| 15th day of the following month”verbatim · tax.colorado.gov · retrieved 2026-09-23 “Weekly \| $50,000 or more \| Each week beginning on Saturday and ending on Friday \| 3rd business day following the Friday that concludes the week”verbatim · tax.colorado.gov · retrieved 2026-09-23	Applies toFor an employer the preparer attests withholds Colorado tax: filing frequency by annual Colorado wage withholding — less than $7,000 quarterly (last day of the month after the quarter); $7,000 to $50,000 monthly (15th of the next month); $50,000 or more weekly (3rd business day after the Friday ending the week). Shown as information; no date is generated.	Due ruleNo date: see the source text	2027 dates—	Source · retrievedtax.colorado.gov/withholding-tax-guide (official source, opens in a new tab)retrieved 2026-09-23

W-2 filing with the Department (paper filers: DR 1093 transmittal)

Source text

“Every employer that is subject to Colorado wage withholding requirements must file with the Department any W-2 reporting Colorado wages or Colorado withholding. The required W-2s for any calendar year must be filed with the Department on or before January 31st of the following year.”verbatim · tax.colorado.gov · retrieved 2026-09-23

Applies toAn employer the preparer attests is subject to Colorado wage withholding files its W-2s reporting Colorado wages or withholding with the Department by January 31 of the following year (paper filers attach the DR 1093 transmittal). The source states no weekend rule for this filing, so the stated date is shown.

Due ruleDR 1093: January 31 of the year after the calendar year ends

2027 dates

Jan 31SunDR 1093

Falls on a Sunday; the source states no weekend rule.

Source · retrievedtax.colorado.gov/withholding-tax-guideretrieved 2026-09-23

Wage withholding filing frequency

Source text

“Quarterly | Less than $7,000 | Each calendar quarter ending March 31st, June 30th, September 30th, and December 31st | Last day of the month following the close of the calendar quarter”verbatim · tax.colorado.gov · retrieved 2026-09-23

“Monthly | At least $7,000, but not more than $50,000 | Each calendar month | 15th day of the following month”verbatim · tax.colorado.gov · retrieved 2026-09-23

“Weekly | $50,000 or more | Each week beginning on Saturday and ending on Friday | 3rd business day following the Friday that concludes the week”verbatim · tax.colorado.gov · retrieved 2026-09-23

Applies toFor an employer the preparer attests withholds Colorado tax: filing frequency by annual Colorado wage withholding — less than $7,000 quarterly (last day of the month after the quarter); $7,000 to $50,000 monthly (15th of the next month); $50,000 or more weekly (3rd business day after the Friday ending the week). Shown as information; no date is generated.

Due ruleNo date: see the source text

2027 dates—

Source · retrievedtax.colorado.gov/withholding-tax-guideretrieved 2026-09-23

Unemployment insurance

4 dates

Employer contribution and wage reports for unemployment insurance: the state program, and FUTA at the federal level.

Obligation	Applies to	Due rule	2027 dates	Source · retrieved
Quarterly UI wage and premium reports Source text “The quarterly reports and premiums owed for the quarter are due on the last day of the month following the end of the calendar quarter (example: first quarter ends March 31, so first quarter reports are due by April 30).”verbatim · cdle.colorado.gov · retrieved 2026-09-23	Applies toAn employer the preparer lists as a quarterly Colorado unemployment-insurance filer: the quarterly UI wage and premium reports and premiums are due the last day of the month after each calendar quarter (April 30, July 31, October 31, January 31). The source states no weekend rule, so the stated date is shown.	Due ruleQuarterly wage and premium reports: last day of the month after the quarter ends	2027 dates Jan 31Sun†Quarterly wage and premium reports Apr 30FriQuarterly wage and premium reports Jul 31Sat†Quarterly wage and premium reports Oct 31Sun†Quarterly wage and premium reports † Falls on a Sunday; the source states no weekend rule. Falls on a Saturday; the source states no weekend rule.	Source · retrievedcdle.colorado.gov/sites/cdle/files/Employer_Guide_0.pdf (official source, opens in a new tab)retrieved 2026-09-23

Quarterly UI wage and premium reports

Source text

“The quarterly reports and premiums owed for the quarter are due on the last day of the month following the end of the calendar quarter (example: first quarter ends March 31, so first quarter reports are due by April 30).”verbatim · cdle.colorado.gov · retrieved 2026-09-23

Applies toAn employer the preparer lists as a quarterly Colorado unemployment-insurance filer: the quarterly UI wage and premium reports and premiums are due the last day of the month after each calendar quarter (April 30, July 31, October 31, January 31). The source states no weekend rule, so the stated date is shown.

Due ruleQuarterly wage and premium reports: last day of the month after the quarter ends

2027 dates

Jan 31Sun†Quarterly wage and premium reports
Apr 30FriQuarterly wage and premium reports
Jul 31Sat†Quarterly wage and premium reports
Oct 31Sun†Quarterly wage and premium reports

† Falls on a Sunday; the source states no weekend rule. Falls on a Saturday; the source states no weekend rule.

Source · retrievedcdle.colorado.gov/sites/cdle/files/Employer_Guide_0.pdfretrieved 2026-09-23

Sales and use tax

17 dates

Returns for sales and use tax collected under a permit. The agency assigns each permit holder a filing frequency; the dates differ by frequency.

Obligation	Applies to	Due rule	2027 dates	Source · retrieved
State sales tax return (DR 0100)annual filer Source text “Returns are due the 20th day of the month following the close of the filing period. If the 20th is a Saturday, Sunday, or legal holiday, the return is due the next business day. Monthly Returns: due the 20th day of the month following the reporting month. Quarterly Returns: 1st quarter (January – March): due April 20 2nd quarter (April – June): due July 20 3rd quarter (July – September): due October 20 4th quarter (October – December): due January 20 Annual Returns: (January – December): due January 20”verbatim · tax.colorado.gov · retrieved 2026-09-23 “(3) If the date for filing any report, claim, tax return, statement, remittance, or other document falls upon a Saturday, Sunday, or legal holiday, it shall be deemed to have been timely filed if filed on the next business day.”verbatim · C.R.S. §39-21-119(3) · olls.info · retrieved 2026-09-26	Applies toSales tax returns are due the 20th of the month after the filing period: monthly returns the 20th of the next month; quarterly returns April 20, July 20, October 20, January 20; annual returns January 20. A Saturday, Sunday or legal-holiday date moves to the next business day. Self-collected home-rule city taxes are not covered.	Due ruleSales tax return: 20th day of the month after the calendar year endsIf this date falls on a Saturday, Sunday or a Colorado legal holiday, it moves to the next business day — C.R.S. §39-21-119(3). Not every such holiday is compiled: Days appointed or recommended by the Governor or the President as a day of fasting or prayer or thanksgiving (§24-11-101(1)) are not listed. Public-office closure days are not listed: §24-11-110 continues only a document due at a closed public office (not a remittance), while this set's authority (§39-21-119(3)) also rolls remittances, so a closure day in this list would move a remittance later than the law does — e.g. the Department of Revenue's published closure on Friday, July 3, 2026 is left out.olls.info/crs/crs2026-title-39.htm (official source, opens in a new tab)retrieved 2026-09-26 · C.R.S. §39-21-119(3)	2027 dates Jan 20WedSales tax return State legal holidays are not compiled: if this date is a state holiday, the deadline moves to the next business day.	Source · retrievedtax.colorado.gov/sites/tax/files/documents/DR0100_2024_0.pdf (official source, opens in a new tab)retrieved 2026-09-23
State sales tax return (DR 0100)quarterly filer Source text “Returns are due the 20th day of the month following the close of the filing period. If the 20th is a Saturday, Sunday, or legal holiday, the return is due the next business day. Monthly Returns: due the 20th day of the month following the reporting month. Quarterly Returns: 1st quarter (January – March): due April 20 2nd quarter (April – June): due July 20 3rd quarter (July – September): due October 20 4th quarter (October – December): due January 20 Annual Returns: (January – December): due January 20”verbatim · tax.colorado.gov · retrieved 2026-09-23 “(3) If the date for filing any report, claim, tax return, statement, remittance, or other document falls upon a Saturday, Sunday, or legal holiday, it shall be deemed to have been timely filed if filed on the next business day.”verbatim · C.R.S. §39-21-119(3) · olls.info · retrieved 2026-09-26	Applies toSales tax returns are due the 20th of the month after the filing period: monthly returns the 20th of the next month; quarterly returns April 20, July 20, October 20, January 20; annual returns January 20. A Saturday, Sunday or legal-holiday date moves to the next business day. Self-collected home-rule city taxes are not covered.	Due ruleSales tax return: 20th day of the month after the quarter endsIf this date falls on a Saturday, Sunday or a Colorado legal holiday, it moves to the next business day — C.R.S. §39-21-119(3). Not every such holiday is compiled: Days appointed or recommended by the Governor or the President as a day of fasting or prayer or thanksgiving (§24-11-101(1)) are not listed. Public-office closure days are not listed: §24-11-110 continues only a document due at a closed public office (not a remittance), while this set's authority (§39-21-119(3)) also rolls remittances, so a closure day in this list would move a remittance later than the law does — e.g. the Department of Revenue's published closure on Friday, July 3, 2026 is left out.olls.info/crs/crs2026-title-39.htm (official source, opens in a new tab)retrieved 2026-09-26 · C.R.S. §39-21-119(3)	2027 dates Jan 20WedSales tax return Apr 20TueSales tax return Jul 20TueSales tax return Oct 20WedSales tax return State legal holidays are not compiled: if this date is a state holiday, the deadline moves to the next business day.	Source · retrievedtax.colorado.gov/sites/tax/files/documents/DR0100_2024_0.pdf (official source, opens in a new tab)retrieved 2026-09-23
State sales tax return (DR 0100)monthly filer Source text “Returns are due the 20th day of the month following the close of the filing period. If the 20th is a Saturday, Sunday, or legal holiday, the return is due the next business day. Monthly Returns: due the 20th day of the month following the reporting month. Quarterly Returns: 1st quarter (January – March): due April 20 2nd quarter (April – June): due July 20 3rd quarter (July – September): due October 20 4th quarter (October – December): due January 20 Annual Returns: (January – December): due January 20”verbatim · tax.colorado.gov · retrieved 2026-09-23 “(3) If the date for filing any report, claim, tax return, statement, remittance, or other document falls upon a Saturday, Sunday, or legal holiday, it shall be deemed to have been timely filed if filed on the next business day.”verbatim · C.R.S. §39-21-119(3) · olls.info · retrieved 2026-09-26	Applies toSales tax returns are due the 20th of the month after the filing period: monthly returns the 20th of the next month; quarterly returns April 20, July 20, October 20, January 20; annual returns January 20. A Saturday, Sunday or legal-holiday date moves to the next business day. Self-collected home-rule city taxes are not covered.	Due ruleSales tax return: 20th day of the month after the month endsIf this date falls on a Saturday, Sunday or a Colorado legal holiday, it moves to the next business day — C.R.S. §39-21-119(3). Not every such holiday is compiled: Days appointed or recommended by the Governor or the President as a day of fasting or prayer or thanksgiving (§24-11-101(1)) are not listed. Public-office closure days are not listed: §24-11-110 continues only a document due at a closed public office (not a remittance), while this set's authority (§39-21-119(3)) also rolls remittances, so a closure day in this list would move a remittance later than the law does — e.g. the Department of Revenue's published closure on Friday, July 3, 2026 is left out.olls.info/crs/crs2026-title-39.htm (official source, opens in a new tab)retrieved 2026-09-26 · C.R.S. §39-21-119(3)	2027 dates Jan 20WedSales tax return Feb 22MonSales tax return · moved from Sat Feb 20 Mar 22MonSales tax return · moved from Sat Mar 20 Apr 20TueSales tax return May 20ThuSales tax return Jun 21MonSales tax return · moved from Sun Jun 20 Jul 20TueSales tax return Aug 20FriSales tax return Sep 20MonSales tax return Oct 20WedSales tax return Nov 22MonSales tax return · moved from Sat Nov 20 Dec 20MonSales tax return State legal holidays are not compiled: if this date is a state holiday, the deadline moves to the next business day.	Source · retrievedtax.colorado.gov/sites/tax/files/documents/DR0100_2024_0.pdf (official source, opens in a new tab)retrieved 2026-09-23

State sales tax return (DR 0100)annual filer

Source text

“Returns are due the 20th day of the month following the close of the filing period. If the 20th is a Saturday, Sunday, or legal holiday, the return is due the next business day. Monthly Returns: due the 20th day of the month following the reporting month. Quarterly Returns: 1st quarter (January – March): due April 20 2nd quarter (April – June): due July 20 3rd quarter (July – September): due October 20 4th quarter (October – December): due January 20 Annual Returns: (January – December): due January 20”verbatim · tax.colorado.gov · retrieved 2026-09-23

“(3) If the date for filing any report, claim, tax return, statement, remittance, or other document falls upon a Saturday, Sunday, or legal holiday, it shall be deemed to have been timely filed if filed on the next business day.”verbatim · C.R.S. §39-21-119(3) · olls.info · retrieved 2026-09-26

Applies toSales tax returns are due the 20th of the month after the filing period: monthly returns the 20th of the next month; quarterly returns April 20, July 20, October 20, January 20; annual returns January 20. A Saturday, Sunday or legal-holiday date moves to the next business day. Self-collected home-rule city taxes are not covered.

Due ruleSales tax return: 20th day of the month after the calendar year endsIf this date falls on a Saturday, Sunday or a Colorado legal holiday, it moves to the next business day — C.R.S. §39-21-119(3). Not every such holiday is compiled: Days appointed or recommended by the Governor or the President as a day of fasting or prayer or thanksgiving (§24-11-101(1)) are not listed. Public-office closure days are not listed: §24-11-110 continues only a document due at a closed public office (not a remittance), while this set's authority (§39-21-119(3)) also rolls remittances, so a closure day in this list would move a remittance later than the law does — e.g. the Department of Revenue's published closure on Friday, July 3, 2026 is left out.olls.info/crs/crs2026-title-39.htmretrieved 2026-09-26 · C.R.S. §39-21-119(3)

2027 dates

Jan 20WedSales tax return

State legal holidays are not compiled: if this date is a state holiday, the deadline moves to the next business day.

Source · retrievedtax.colorado.gov/sites/tax/files/documents/DR0100_2024_0.pdfretrieved 2026-09-23

State sales tax return (DR 0100)quarterly filer

Source text

“Returns are due the 20th day of the month following the close of the filing period. If the 20th is a Saturday, Sunday, or legal holiday, the return is due the next business day. Monthly Returns: due the 20th day of the month following the reporting month. Quarterly Returns: 1st quarter (January – March): due April 20 2nd quarter (April – June): due July 20 3rd quarter (July – September): due October 20 4th quarter (October – December): due January 20 Annual Returns: (January – December): due January 20”verbatim · tax.colorado.gov · retrieved 2026-09-23

“(3) If the date for filing any report, claim, tax return, statement, remittance, or other document falls upon a Saturday, Sunday, or legal holiday, it shall be deemed to have been timely filed if filed on the next business day.”verbatim · C.R.S. §39-21-119(3) · olls.info · retrieved 2026-09-26

Due ruleSales tax return: 20th day of the month after the quarter endsIf this date falls on a Saturday, Sunday or a Colorado legal holiday, it moves to the next business day — C.R.S. §39-21-119(3). Not every such holiday is compiled: Days appointed or recommended by the Governor or the President as a day of fasting or prayer or thanksgiving (§24-11-101(1)) are not listed. Public-office closure days are not listed: §24-11-110 continues only a document due at a closed public office (not a remittance), while this set's authority (§39-21-119(3)) also rolls remittances, so a closure day in this list would move a remittance later than the law does — e.g. the Department of Revenue's published closure on Friday, July 3, 2026 is left out.olls.info/crs/crs2026-title-39.htmretrieved 2026-09-26 · C.R.S. §39-21-119(3)

2027 dates

Jan 20WedSales tax return
Apr 20TueSales tax return
Jul 20TueSales tax return
Oct 20WedSales tax return

State legal holidays are not compiled: if this date is a state holiday, the deadline moves to the next business day.

Source · retrievedtax.colorado.gov/sites/tax/files/documents/DR0100_2024_0.pdfretrieved 2026-09-23

State sales tax return (DR 0100)monthly filer

Source text

“Returns are due the 20th day of the month following the close of the filing period. If the 20th is a Saturday, Sunday, or legal holiday, the return is due the next business day. Monthly Returns: due the 20th day of the month following the reporting month. Quarterly Returns: 1st quarter (January – March): due April 20 2nd quarter (April – June): due July 20 3rd quarter (July – September): due October 20 4th quarter (October – December): due January 20 Annual Returns: (January – December): due January 20”verbatim · tax.colorado.gov · retrieved 2026-09-23

“(3) If the date for filing any report, claim, tax return, statement, remittance, or other document falls upon a Saturday, Sunday, or legal holiday, it shall be deemed to have been timely filed if filed on the next business day.”verbatim · C.R.S. §39-21-119(3) · olls.info · retrieved 2026-09-26

Due ruleSales tax return: 20th day of the month after the month endsIf this date falls on a Saturday, Sunday or a Colorado legal holiday, it moves to the next business day — C.R.S. §39-21-119(3). Not every such holiday is compiled: Days appointed or recommended by the Governor or the President as a day of fasting or prayer or thanksgiving (§24-11-101(1)) are not listed. Public-office closure days are not listed: §24-11-110 continues only a document due at a closed public office (not a remittance), while this set's authority (§39-21-119(3)) also rolls remittances, so a closure day in this list would move a remittance later than the law does — e.g. the Department of Revenue's published closure on Friday, July 3, 2026 is left out.olls.info/crs/crs2026-title-39.htmretrieved 2026-09-26 · C.R.S. §39-21-119(3)

2027 dates

Jan 20WedSales tax return
Feb 22MonSales tax return · moved from Sat Feb 20
Mar 22MonSales tax return · moved from Sat Mar 20
Apr 20TueSales tax return
May 20ThuSales tax return
Jun 21MonSales tax return · moved from Sun Jun 20
Jul 20TueSales tax return
Aug 20FriSales tax return
Sep 20MonSales tax return
Oct 20WedSales tax return
Nov 22MonSales tax return · moved from Sat Nov 20
Dec 20MonSales tax return

State legal holidays are not compiled: if this date is a state holiday, the deadline moves to the next business day.

Source · retrievedtax.colorado.gov/sites/tax/files/documents/DR0100_2024_0.pdfretrieved 2026-09-23

Annual report

12 dates

The annual or biennial report an entity files with the Secretary of State (or its equivalent) to stay in good standing. Some are keyed to the month the entity was formed.

Obligation	Applies to	Due rule	2027 dates	Source · retrieved
Secretary of State periodic reportany business except a sole proprietor or general partnership Source text “(c) (I) Unless otherwise elected as provided in subparagraph (II) of this paragraph (c), a reporting entity shall deliver its first periodic report to the secretary of state, for filing pursuant to part 3 of this article, no later than the last day of the second calendar month following the first anniversary of the calendar month in which the reporting entity's constituent filed document or statement of foreign entity authority, as the case may be, became effective or, in the case of a reporting entity that has been reinstated or that has cured its delinquency, no later than the last day of the second calendar month following the first anniversary of the calendar month in which the reinstatement or curing of delinquency occurred. Unless otherwise elected as provided in subparagraph (II) or (III) of this paragraph (c), thereafter, the periodic report shall be delivered to the secretary of state by each reporting entity annually.”verbatim · leg.colorado.gov · retrieved 2026-09-23	Applies toAn entity formed in Colorado delivers its periodic report annually, by the last day of the second calendar month after the anniversary of the month it was formed. Foreign entities (dated from their authority month), reinstated entities and entities that elected a different month are not covered.	Due rulePeriodic report: last day of the 3rd month of the filing year (from the formation month)	2027 dates Jan 31Sun†Periodic report · formed in November Feb 28Sun†Periodic report · formed in December Mar 31WedPeriodic report · formed in January Apr 30FriPeriodic report · formed in February May 31MonPeriodic report · formed in March Jun 30WedPeriodic report · formed in April Jul 31Sat†Periodic report · formed in May Aug 31TuePeriodic report · formed in June Sep 30ThuPeriodic report · formed in July Oct 31Sun†Periodic report · formed in August Nov 30TuePeriodic report · formed in September Dec 31FriPeriodic report · formed in October † Falls on a Sunday; the source states no weekend rule. Falls on a Saturday; the source states no weekend rule.	Source · retrievedleg.colorado.gov/sites/default/files/images/olls/crs2024-title-07.pdf (official source, opens in a new tab)retrieved 2026-09-23

Secretary of State periodic reportany business except a sole proprietor or general partnership

Source text

“(c) (I) Unless otherwise elected as provided in subparagraph (II) of this paragraph (c), a reporting entity shall deliver its first periodic report to the secretary of state, for filing pursuant to part 3 of this article, no later than the last day of the second calendar month following the first anniversary of the calendar month in which the reporting entity's constituent filed document or statement of foreign entity authority, as the case may be, became effective or, in the case of a reporting entity that has been reinstated or that has cured its delinquency, no later than the last day of the second calendar month following the first anniversary of the calendar month in which the reinstatement or curing of delinquency occurred. Unless otherwise elected as provided in subparagraph (II) or (III) of this paragraph (c), thereafter, the periodic report shall be delivered to the secretary of state by each reporting entity annually.”verbatim · leg.colorado.gov · retrieved 2026-09-23

Applies toAn entity formed in Colorado delivers its periodic report annually, by the last day of the second calendar month after the anniversary of the month it was formed. Foreign entities (dated from their authority month), reinstated entities and entities that elected a different month are not covered.

Due rulePeriodic report: last day of the 3rd month of the filing year (from the formation month)

2027 dates

Jan 31Sun†Periodic report · formed in November
Feb 28Sun†Periodic report · formed in December
Mar 31WedPeriodic report · formed in January
Apr 30FriPeriodic report · formed in February
May 31MonPeriodic report · formed in March
Jun 30WedPeriodic report · formed in April
Jul 31Sat†Periodic report · formed in May
Aug 31TuePeriodic report · formed in June
Sep 30ThuPeriodic report · formed in July
Oct 31Sun†Periodic report · formed in August
Nov 30TuePeriodic report · formed in September
Dec 31FriPeriodic report · formed in October

† Falls on a Sunday; the source states no weekend rule. Falls on a Saturday; the source states no weekend rule.

Source · retrievedleg.colorado.gov/sites/default/files/images/olls/crs2024-title-07.pdfretrieved 2026-09-23

Dates are computed from the linked pages as they read on each retrieval date. Agencies change their pages, and the IRS postpones deadlines after disasters; confirm with the source before filing.

Tracking these for a list of clients? FilingDates builds each client’s calendar from the same rules, with every date linked to its source.