How Alabama sales tax deadlines work.
Alabama state sales tax is generally due monthly on or before the 20th day of the month following the month of activity. Eligible taxpayers may request quarterly, semiannual, or annual status based on prior-year tax liability and other conditions. A change in status must be approved rather than assumed.
| Filing frequency | Standard timing |
|---|---|
| Monthly | 20th day of the month following the reporting month. |
| Quarterly | 20th day of the month following the calendar quarter. |
| Semiannual | July 20 and January 20 for standard half-year periods. |
| Annual | January 20 following the reporting year. |
Build the client workflow before the due date.
The legal deadline is the last step. Set an earlier request date for source reports, then reserve time for reconciliation, exception review, return preparation, approval, and payment. Each obligation should identify the client, state account, reporting period, assigned frequency, preparer, reviewer, and payment owner.
Account schedule
Confirm registration, filing frequency, period, portal access, and special payment requirements.
Filing packet
Reconcile gross and taxable sales, exemptions, marketplace activity, refunds, and tax collected.
Proof of completion
Keep the reviewed return, filing confirmation, payment evidence, and notes together.
Alabama client checklist.
- Verify the assigned frequency in the official state account.
- Confirm the reporting period and any weekend or holiday adjustment.
- Set internal report, preparation, review, approval, and payment dates.
- Track zero-return, amended-return, and notice-related work separately.
- Reconcile direct sales, marketplace sales, deductions, refunds, and tax collected.
- Save return and payment confirmations with the completed period.
Official Alabama sources.
This page was reviewed September 25, 2026 using the Alabama Department of Revenue due-date calendar and Alabama sales tax due-date FAQ. State guidance and account assignments can change. Verify the client's current portal instructions before filing or paying.
Connect research to the firm calendar.
Use the AtomicTax multi-client tax calendar to turn the verified state date into accountable work. For registration, nexus, and broader state requirements, read the Alabama filing guide or browse the state resource directory.