2026 due dates, filing frequencies, form ONE SPOT Sales Tax, and official filing resources.
Monthly Alabama sales tax returns are due the 20th of the month following the period. Quarterly returns are due the 20th of the month following the period (calendar quarters). When a due date lands on a weekend or federal holiday it moves to the next business day; the 2026 calendar on this page already applies that adjustment.
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Every date below comes from the state's published deadline rule (dataset 2026.07.0) and is already moved to the next business day when it lands on a weekend or federal holiday. Your account's assigned filing frequency decides which table applies.
Rule: 20th of the month following the period.
| Period | Period ends | Return due |
|---|---|---|
| January 2026 | Jan 31, 2026 | Feb 20, 2026 |
| February 2026 | Feb 28, 2026 | Mar 20, 2026 |
| March 2026 | Mar 31, 2026 | Apr 20, 2026 |
| April 2026 | Apr 30, 2026 | May 20, 2026 |
| May 2026 | May 31, 2026 | Jun 22, 2026 (moved: 2026-06-20 falls on a Saturday) |
| June 2026 | Jun 30, 2026 | Jul 20, 2026 |
| July 2026 | Jul 31, 2026 | Aug 20, 2026 |
| August 2026 | Aug 31, 2026 | Sep 21, 2026 (moved: 2026-09-20 falls on a Sunday) |
| September 2026 | Sep 30, 2026 | Oct 20, 2026 |
| October 2026 | Oct 31, 2026 | Nov 20, 2026 |
| November 2026 | Nov 30, 2026 | Dec 21, 2026 (moved: 2026-12-20 falls on a Sunday) |
| December 2026 | Dec 31, 2026 | Jan 20, 2027 |
Rule: 20th of the month following the period (calendar quarters).
| Period | Period ends | Return due |
|---|---|---|
| Q1 2026 | Mar 31, 2026 | Apr 20, 2026 |
| Q2 2026 | Jun 30, 2026 | Jul 20, 2026 |
| Q3 2026 | Sep 30, 2026 | Oct 20, 2026 |
| Q4 2026 | Dec 31, 2026 | Jan 20, 2027 |
Rule: 20th of the month following the period (halves: due Jul 20 / Jan 20).
| Period | Period ends | Return due |
|---|---|---|
| January–June 2026 | Jun 30, 2026 | Jul 20, 2026 |
| July–December 2026 | Dec 31, 2026 | Jan 20, 2027 |
Rule: January 20 following the calendar year.
| Period | Period ends | Return due |
|---|---|---|
| Calendar year 2026 | Dec 31, 2026 | Jan 20, 2027 |
The principal repository-tracked return is ONE SPOT Sales Tax. The reviewed filing posture requires electronic filing rather than a mailed paper return.
Paper filing posture: not accepted
Prophit.ai tracks every Alabama due date above inside the return workspace, builds the period from your transaction data, and produces worksheet for portal entry that a reviewer approves before anything is submitted.
Need every state at once? Download the 2026 sales tax filing calendar (CSV + ICS, all states, weekend/holiday-adjusted).
Workflow support does not by itself establish registration, filing authority, credentials, agency acceptance, or tax advice. Confirm your assigned filing frequency with the state.
Monthly Alabama sales tax returns are due the 20th of the month following the period. Quarterly returns are due the 20th of the month following the period (calendar quarters). When a due date lands on a weekend or federal holiday it moves to the next business day; the 2026 calendar on this page already applies that adjustment.
Alabama assigns a filing frequency to each account. The published cadences are monthly, quarterly, semi-annual and annual filing; the state assigns the frequency based on tax volume and notifies the account, so confirm the assigned basis before relying on a calendar.
The Alabama return tracked here is ONE SPOT Sales Tax. The principal repository-tracked return is ONE SPOT Sales Tax. The reviewed filing posture requires electronic filing rather than a mailed paper return.
The due date moves to the next business day. In 2026, 3 of the Alabama due dates listed on this page are adjusted for a weekend or federal holiday; each adjusted date is marked in the calendar.
Paper filing posture tracked for Alabama: not accepted. The principal repository-tracked return is ONE SPOT Sales Tax. The reviewed filing posture requires electronic filing rather than a mailed paper return.
Reviewed and current as of October 26, 2026. Read the full Alabama sales tax guide for rates, sourcing, products, exemptions, and marketplace rules.
