Washington business filing dates, 2027
State-level due dates for businesses filing in Washington. 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 CalendarAdd to Apple or OutlookDownload .ics33 dated lines in the calendar file · sources last read 2026-09-23
Coverage · 3 of 6 fully dated
Income / franchise tax return
UnsupportedThe 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.
Why no dates: No official source confirmed yet for Washington's business income or franchise tax return due dates.
| Obligation | Applies to | Due rule | 2027 dates | Source · retrieved |
|---|---|---|---|---|
| Income / franchise tax return | Applies toShown once verified | Due ruleUnsupported | 2027 datesNo official source confirmed yet for Washington's business income or franchise tax return due dates. | Source · retrievedNo verified source on file |
Estimated tax
UnsupportedInstallments 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.
Why no dates: No official source confirmed yet for Washington's estimated tax payment due dates.
| Obligation | Applies to | Due rule | 2027 dates | Source · retrieved |
|---|---|---|---|---|
| Estimated tax | Applies toShown once verified | Due ruleUnsupported | 2027 datesNo official source confirmed yet for Washington's estimated tax payment due dates. | Source · retrievedNo verified source on file |
Withholding
UnsupportedReturns 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.
Why no dates: No official source confirmed yet for Washington's employer withholding due dates.
| Obligation | Applies to | Due rule | 2027 dates | Source · retrieved |
|---|---|---|---|---|
| Withholding | Applies toShown once verified | Due ruleUnsupported | 2027 datesNo official source confirmed yet for Washington's employer withholding due dates. | Source · retrievedNo verified source on file |
Unemployment insurance
4 datesEmployer 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 unemployment tax and wage reportSource text“Your unemployment tax and wage reports are due on the last day of the month after the last day of each quarter.”verbatim · esd.wa.gov · retrieved 2026-09-23 | Applies toAn employer the preparer lists as a quarterly Washington unemployment-insurance filer (an active ESD account) files its tax and wage report by the last day of the month after each quarter (April 30, July 31, October 31, January 31); a weekend or state-holiday date may be met the next business day. | Due ruleTax and wage report: last day of the month after the quarter endsA date on a weekend moves to the next business day; state holidays are not compiled. | 2027 dates
State legal holidays are not compiled: if this date is a state holiday, the deadline moves to the next business day. | Source · retrievedesd.wa.gov/employer-requirements/quarterly-reports/how-file-your-quarterly-tax-and-wage-reports (official source, opens in a new tab)retrieved |
Sales and use tax
17 datesReturns 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 |
|---|---|---|---|---|
Combined excise tax return (B&O and sales tax)monthly filerSource text“Monthly returns are due the 25th of every month. (e.g. The June tax return is due July 25.) Quarterly returns are due the end of the month following the tax quarter. (e.g. The Quarter 1 (Jan, Feb, Mar) tax return is due April 30.) Annual returns are due April 15. (e.g. The Annual 2019 tax return is due April 15, 2020) If the due date falls on a weekend or legal holiday, the due date is extended to the next business day.”verbatim · dor.wa.gov · retrieved 2026-09-23 “Filing frequencies are assigned based on what you estimate for your yearly business income.”verbatim · dor.wa.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, the filing shall be considered timely if performed on the next business day.”verbatim · RCW 1.12.070(3) · app.leg.wa.gov · retrieved 2026-09-24 | Applies toWashington's combined excise tax return (business and occupation tax and retail sales tax) is filed at the frequency the Department assigns each business (the preparer declares it): monthly returns by the 25th of the following month, quarterly returns by the end of the month after the quarter, annual returns by April 15 of the following year. A weekend or legal-holiday date moves to the next business day. | Due ruleExcise tax return: 25th day of the month after the month endsIf this date falls on a Saturday, Sunday or a Washington state legal holiday, it moves to the next business day — RCW 1.12.070(3)app.leg.wa.gov/rcw/default.aspx?cite=1.12.070 (official source, opens in a new tab)retrieved · RCW 1.12.070(3) | 2027 dates
| Source · retrieveddor.wa.gov/file-pay-taxes/filing-frequencies-due-dates (official source, opens in a new tab)retrieved |
Combined excise tax return (B&O and sales tax)quarterly filerSource text“Monthly returns are due the 25th of every month. (e.g. The June tax return is due July 25.) Quarterly returns are due the end of the month following the tax quarter. (e.g. The Quarter 1 (Jan, Feb, Mar) tax return is due April 30.) Annual returns are due April 15. (e.g. The Annual 2019 tax return is due April 15, 2020) If the due date falls on a weekend or legal holiday, the due date is extended to the next business day.”verbatim · dor.wa.gov · retrieved 2026-09-23 “Filing frequencies are assigned based on what you estimate for your yearly business income.”verbatim · dor.wa.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, the filing shall be considered timely if performed on the next business day.”verbatim · RCW 1.12.070(3) · app.leg.wa.gov · retrieved 2026-09-24 | Applies toWashington's combined excise tax return (business and occupation tax and retail sales tax) is filed at the frequency the Department assigns each business (the preparer declares it): monthly returns by the 25th of the following month, quarterly returns by the end of the month after the quarter, annual returns by April 15 of the following year. A weekend or legal-holiday date moves to the next business day. | Due ruleExcise tax return: last day of the month after the quarter endsIf this date falls on a Saturday, Sunday or a Washington state legal holiday, it moves to the next business day — RCW 1.12.070(3)app.leg.wa.gov/rcw/default.aspx?cite=1.12.070 (official source, opens in a new tab)retrieved · RCW 1.12.070(3) | 2027 dates
| Source · retrieveddor.wa.gov/file-pay-taxes/filing-frequencies-due-dates (official source, opens in a new tab)retrieved |
Combined excise tax return (B&O and sales tax)annual filerSource text“Monthly returns are due the 25th of every month. (e.g. The June tax return is due July 25.) Quarterly returns are due the end of the month following the tax quarter. (e.g. The Quarter 1 (Jan, Feb, Mar) tax return is due April 30.) Annual returns are due April 15. (e.g. The Annual 2019 tax return is due April 15, 2020) If the due date falls on a weekend or legal holiday, the due date is extended to the next business day.”verbatim · dor.wa.gov · retrieved 2026-09-23 “Filing frequencies are assigned based on what you estimate for your yearly business income.”verbatim · dor.wa.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, the filing shall be considered timely if performed on the next business day.”verbatim · RCW 1.12.070(3) · app.leg.wa.gov · retrieved 2026-09-24 | Applies toWashington's combined excise tax return (business and occupation tax and retail sales tax) is filed at the frequency the Department assigns each business (the preparer declares it): monthly returns by the 25th of the following month, quarterly returns by the end of the month after the quarter, annual returns by April 15 of the following year. A weekend or legal-holiday date moves to the next business day. | Due ruleAnnual excise tax return: April 15 of the year after the calendar year endsIf this date falls on a Saturday, Sunday or a Washington state legal holiday, it moves to the next business day — RCW 1.12.070(3)app.leg.wa.gov/rcw/default.aspx?cite=1.12.070 (official source, opens in a new tab)retrieved · RCW 1.12.070(3) | 2027 dates
| Source · retrieveddor.wa.gov/file-pay-taxes/filing-frequencies-due-dates (official source, opens in a new tab)retrieved |
Annual report
12 datesThe 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 annual reportany business except a sole proprietor or general partnershipSource text“All domestic and foreign business entities must file an Annual Report yearly to maintain their active status and keep their Unified Business Identifier (UBI) in good standing. This annual report is due by the last day of the month in which the business was originally formed or registered.”verbatim · sos.wa.gov · retrieved 2026-09-23 | Applies toEvery business entity files an annual report each year by the last day of the month it was originally formed. Foreign entities (dated from their registration month) are not covered. | Due ruleAnnual report: last day of the 1st month of the filing year (from the formation month) | 2027 dates
† Falls on a Sunday; the source states no weekend rule. Falls on a Saturday; the source states no weekend rule. | Source · retrievedsos.wa.gov/corporations-charities/business-entities/maintain-business-compliance/annual-reports (official source, opens in a new tab)retrieved |
Due-date rules
no fixed dateThe conventions other lines cite: how a date on a weekend or holiday moves, and how a disaster declaration postpones deadlines.
| Obligation | Applies to | Due rule | 2027 dates | Source · retrieved |
|---|---|---|---|---|
Weekend and holiday due datesSource text“If the due date falls on a weekend or legal holiday, the due date is extended to the next business day.”verbatim · dor.wa.gov · retrieved 2026-09-23 | Applies toA Washington excise tax return due on a weekend or legal holiday is due the next business day. | Due ruleNo date: see the source text | 2027 dates— | Source · retrieveddor.wa.gov/file-pay-taxes/filing-frequencies-due-dates (official source, opens in a new tab)retrieved |
Weekend and holiday due datesSource text“When a due date is on a weekend or state holiday, you may send your report the next business day online or by mail.”verbatim · esd.wa.gov · retrieved 2026-09-23 | Applies toA Washington unemployment tax report due on a weekend or state holiday may be sent the next business day. | Due ruleNo date: see the source text | 2027 dates— | Source · retrievedesd.wa.gov/employer-requirements/quarterly-reports/how-file-your-quarterly-tax-and-wage-reports (official source, opens in a new tab)retrieved |
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.
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