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Blog, Sales Tax Due Dates

September 2026 Sales Tax Due Dates (State-by-State Filing Calendar)

By Ali Walker

August 19, 2026
September sales tax due date

Published: August 19, 2026

Labor Day marks the unofficial end of summer—but in the sales tax world, September marks the final month of Q3, and ushers in thematic sales tax holidays like Louisiana’s Second Amendment tax-free weekend alongside your regular filing obligations.

Between new exempt transactions to track and the pressure of closing out your books for Q3, compliance teams have a lot on their plate this month. That’s why we’ve put together this state-by-state guide to September sales tax deadlines, so you can spend less time cross-referencing calendars and more time running your business. Fair warning: quite a few deadlines shift this month because they fall on a weekend, so double-check the due date for every state where you file.

Note: Due dates have been adjusted based on each state’s weekend and holiday filing rules. Businesses should always verify filing requirements directly with the appropriate state tax authority.

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Sales Tax Due Dates FAQ

What are sales tax filing deadlines?

Sales tax due dates are the deadlines businesses must meet to file sales tax returns and remit collected sales tax to state tax authorities.

How often do businesses need to file sales tax returns?

Sales tax returns may be due monthly, quarterly, annually, or on another assigned schedule depending on the state.

Who determines sales tax filing frequencies?

State tax agencies determine sales tax filing frequencies based factors such as average monthly tax liability, revenue volume, and filing history.

Do all states have the same sales tax due dates?

No. Sales tax due dates vary by state, filing frequency, tax type, and other administrative rules.

What happens if a reporting deadline falls on a weekend or holiday?

Many states extend filing deadlines to the next business day when a due date falls on a weekend or state/federal holiday.

Can your sales tax due date change?

Yes. States may temporarily or permanently change sales tax filing deadlines because of holidays, emergency relief, administrative updates, or legislative changes.

What happens if you miss a sales tax deadline?

Missing a sales tax return due date can result in penalties, interest charges, collection actions, and possible account enforcement by the state tax authority.

How can businesses track sales tax due dates across multiple states?

Businesses commonly use in-house compliance calendars, filing software, or outsourced sales tax services to monitor multistate filing deadlines.

When Is Sales Tax Due in September 2026? State-by-State

The following state-by-state table covers each state’s sales tax deadlines for September.

StateFiling FrequencyDay DueNotes
AlabamaMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day.
AlaskaMonthlySeptember 30No statewide sales tax. Remote seller returns for participating local jurisdictions are generally due the last day of the month.
ArizonaMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day.
ArkansasMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day.
CaliforniaMonthlySeptember 30
ColoradoMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day. Most home-rule city returns are also due September 21.
ConnecticutMonthlySeptember 30
District of ColumbiaMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day.
FloridaMonthlySeptember 18
GeorgiaMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day.
Hawaii (GET)MonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day.
IdahoMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day.
IllinoisMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day.
IndianaEarly Monthly; MonthlySeptember 21; September 30Early monthly filings are due September 21 (standard 20th falls on a Sunday); standard monthly filings are due September 30.
IowaMonthlySeptember 30
KansasMonthlySeptember 25
KentuckyMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day.
LouisianaMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day. Parish filing deadlines generally align with the state deadline.
MaineMonthlySeptember 15
MarylandMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day.
MassachusettsMonthlySeptember 30
MichiganMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day.
MinnesotaMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day.
MississippiMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day.
MissouriMonthlySeptember 30
NebraskaMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day.
NevadaMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day.
New JerseyMonthly PrepaymentSeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day. Returns filed quarterly; most businesses remit monthly prepayments.
New Mexico (GRT)MonthlySeptember 25
New YorkMonthly; QuarterlySeptember 21Monthly and quarterly returns due this month; standard September 20 deadline falls on a Sunday and moves to the next business day.
North CarolinaMonthly Prepayment; MonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day. Monthly prepayment filers must remit a prepayment toward the following month’s tax liability with their return.
North DakotaMonthlySeptember 30
OhioMonthlySeptember 23
OklahomaMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day.
PennsylvaniaMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day.
Rhode IslandMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day.
South CarolinaMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day.
South DakotaMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day.
TennesseeMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day.
TexasMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day.
UtahMonthlySeptember 30
VermontMonthlySeptember 25
VirginiaMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day.
WashingtonMonthlySeptember 25
West VirginiaMonthlySeptember 21Standard September 20 deadline falls on a Sunday and moves to the next business day.
WisconsinEarly Monthly; MonthlyAugust 21; September 30Early monthly filings are due September 21 (standard 20th falls on a Sunday); Monthly due September 30.
WyomingMonthlySeptember 30

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Ali Walker

Ali Walker is the primary writer and researcher for SalesTaxSolutions.US, specializing in U.S. sales and use tax compliance, economic nexus laws, SaaS and digital goods taxation, marketplace facilitator rules, and multistate sales tax updates. Her work focuses on helping businesses understand changing state and local sales tax requirements across the United States.

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