Alabama Business Tax Deadlines (2026)
Next: June 15, 2026 — Federal Q2 Estimated Tax Payment & Alabama Estimated Tax Payment
Next Deadline: June 15, 2026 — Federal Q2 Estimated Tax Payment & Alabama Estimated Tax Payment
Federal Tax Deadlines (2026)
| Form | Who Files | Due Date | Extension Deadline |
|---|---|---|---|
| Form 1040 (Schedule C) | Sole proprietors | April 15 | October 15 |
| Form 1065 | Partnerships, Multi-member LLCs | March 15 | September 15 |
| Form 1120-S | S-Corporations | March 15 | September 15 |
| Form 1120 | C-Corporations | April 15 | October 15 |
| Form 990 | Nonprofits | May 15 | November 15 |
| Estimated Taxes (Q1) | All | April 15 | — |
| Estimated Taxes (Q2) | All | June 15 | — |
| Estimated Taxes (Q3) | All | September 15 | — |
| Estimated Taxes (Q4) | All | January 15, 2027 | — |
Alabama State Tax Deadlines (2026)
| Tax Type | Due Date | Form/Filing | Notes |
|---|---|---|---|
| Individual Income Tax | April 15 | Form 40 / 40A | Follows federal due date |
| Corporate Income Tax | April 15 | Form 20C | Calendar year filers |
| Business Privilege Tax | April 15 | Filed with income tax return | Minimum $100 tax |
| S-Corp Income Tax | March 15 | Form 20S | Pass-through entity |
| Partnership Return | March 15 | Form 65 | Pass-through entity |
| Sales Tax (Monthly) | 20th of following month | My Alabama Taxes portal | Threshold: $200,000/year |
| Withholding Tax (Monthly) | 15th of following month | Form A-6 | Employers with AL employees |
| Annual Report | April 15 | Filed with Business Privilege Tax | Via Secretary of State |
| Estimated Income Tax (Q1) | April 15 | Form 40-ES / 20C-ES | Required if >$500 owed |
| Estimated Income Tax (Q2) | June 15 | Form 40-ES / 20C-ES | — |
| Estimated Income Tax (Q3) | September 15 | Form 40-ES / 20C-ES | — |
| Estimated Income Tax (Q4) | January 15, 2027 | Form 40-ES / 20C-ES | — |
Quarterly Estimated Tax Deadlines in Alabama
Alabama follows the same quarterly estimated tax schedule as the federal government:
Estimated payments are required if you expect to owe more than $500 in Alabama income tax for the year.
Alabama-Specific Tax Requirements
Alabama levies both a corporate income tax and a Business Privilege Tax (BPT) on entities doing business in the state. The corporate income tax rate is a flat 6.5% of net income. The Business Privilege Tax is based on net worth and applies to corporations, LLCs, and LLPs, with a minimum tax of $100. The BPT is filed alongside the income tax return on April 15 for calendar-year filers.
Alabama has a state sales tax rate of 4%, but local jurisdictions add their own taxes, bringing combined rates as high as 11% in some areas. Businesses collecting sales tax must file monthly through the My Alabama Taxes portal. Sellers with more than $250,000 in Alabama sales must collect and remit sales tax, including remote sellers (economic nexus threshold).
Alabama is one of a handful of states that allows a deduction for federal income taxes paid on the state return. This can significantly reduce your Alabama tax liability. Payroll withholding is required for employers with Alabama employees, with monthly deposits due by the 15th of the following month.
What Happens If You Miss an Alabama Tax Deadline?
Alabama Department of Revenue
Get Your Books Ready Before Tax Season
Tax deadlines sneak up fast — especially when you're running a business and managing books at the same time. If your QuickBooks is behind, don't stress. Get your books caught up before your next filing deadline so you can file with confidence and avoid costly penalties.
> Books behind before a deadline? Ketchup catches up your QuickBooks in 3–7 business days — so you file on time with clean books. Get your price →
Related Resources
Behind on Alabama taxes?
Accounting Ketchup catches up your QuickBooks so you can file on time.