2027 Alabama State Tax Deadlines | Instead
Last updated: July 6, 2026
Key 2027 Alabama tax deadlines at a glance: Alabama Individual income tax returns for tax year 2027 are due April 18, 2028, with an automatic extension to October 16, 2028. C Corporations file by May 18, 2028 (extension November 16, 2028); S Corporations and Partnerships file by March 15, 2028 (extension September 15, 2028). Estimated tax payments for 2027 are due April 15, June 15, and September 15, 2027, and January 18, 2028.
Alabama Individual income tax filing deadlines and extensions for 2027
If you are a resident or have been involved in business operations within Alabama, you might be required to file Alabama State taxes. Alabama follows a graduated income tax structure with rates ranging from 2% to 5%, making it essential to understand the specific deadlines and requirements for 2027.
Alabama business tax deadlines for 2027
C Corporations' deadlines and requirements
C Corporations in Alabama must file and pay Corporate Income Taxes by May 18, 2028, which is one month following the federal due date of April 18, 2028.
Filing requirements include:
- Complete Form 20C (Alabama Corporation Income Tax Return)
- File online with My Alabama Taxes or approved software
- Payment must be made by May 18, 2028
- Mail-in returns must be postmarked by the due date
Extension to file taxes in Alabama for 2027
The Extension Deadline for Alabama Corporate Income Tax Returns is November 16, 2028. Alabama grants a seven-month extension automatically for federal-extended returns (Form 7004). This is an extension to FILE only. Payment is still due May 18, 2028.
Pass-through entities
Alabama S Corporations and Partnerships tax deadlines for 2027
S Corporations and Partnerships must file Alabama income returns (Form 20S or Form 65) by March 15, 2028.
Required forms include:
- Form 20S (S Corporation Return)
- Form 65 (Partnership/LLC Return)
- Form PPT (Business Privilege Tax Return) (due March 15, 2028 for calendar-year pass-through entities)
Extension to file S Corporations and Partnerships taxes in Alabama for 2027
The Extension Deadline for Alabama S Corporations and Partnerships’ income returns is September 15, 2028 (federal-extended). This is an extension to FILE only. Payment is still due March 15, 2028.
Alabama Individual tax considerations for 2027
Filing requirements and income thresholds
Alabama Individuals must file a State income tax return if their gross income exceeds specific thresholds based on filing status.
The graduated tax rates for 2027 are:
- 2% on the first $500 for single filers ($1,000 for married filing jointly)
- 4% on income from $501-$3,000 for single filers ($1,001-$6,000 for married filing jointly)
- 5% on income exceeding $3,000 for single filers ($6,000 for married filing jointly)
Estimated tax deadline for Alabama 2027
Estimated tax payments are due on the following schedule for calendar year filers:
- April 15, 2027
- June 15, 2027
- September 15, 2027
- January 18, 2028
Who must make estimated payments
You must make Alabama estimated income tax payments during 2027 if you expect to owe $500 or more in Alabama income tax after subtracting withholding and credits. Special considerations include farmers who can pay the entire estimated tax by January 18, 2028, if at least two-thirds of gross income comes from farming. Electronic payments for amounts over $750 are required through the Alabama Interactive system.
Individual tax deadline for Alabama 2027
Individual income tax returns are due April 18, 2028.
Available forms include:
- Form 40 (Residents & Part-Year Residents)
- Form 40A (Full Year Residents)
- Form 40NR (Nonresidents)
Extension to file taxes in Alabama for 2027
The Extension Deadline is October 16, 2028, to file your Alabama Individual Income tax return. Alabama automatically grants a six-month extension without requiring separate extension forms. This is an extension to FILE, not an extension to PAY. Payment is still due April 18, 2028.
What Alabama tax professionals need to know
Several key considerations make Alabama's tax landscape unique for 2027. First, Alabama's graduated income tax system has relatively low thresholds, meaning many taxpayers reach the highest 5% rate with modest incomes. Next, electronic filing requirements have expanded for business entities. Finally, Alabama continues to offer a range of tax-planning opportunities and compliance considerations.
Electronic filing requirements
Alabama has implemented mandatory electronic filing for certain taxpayers:
- C Corporations and pass-through entities must file electronically for tax year 2026 and later
- Individuals can use My Alabama Taxes for free electronic filing
- Business deductions can be processed more efficiently through electronic systems
- Professional preparers must use approved software vendors
- Electronic payment is mandatory for amounts exceeding $750
Alabama's unique tax features for 2027
R&D expenses are deductible in the year incurred
Alabama allows research and development expenses to be fully deducted in the year they are incurred, providing significant tax benefits for qualifying businesses.
30-day nonresident safe harbor for mobile workforce
Provisions provide safe harbor rules for nonresidents working temporarily in Alabama.
$100 business privilege tax exemption
Small businesses may qualify for exemptions from certain privilege tax requirements.
Retirement income benefits
Alabama offers favorable treatment for retirees, including Social Security benefits that are fully exempt from Alabama State income tax, military retired pay that is not subject to State taxation, and many State and local government pensions that receive favorable treatment.
Pass-through entity tax election
Alabama allows S Corporations and certain Partnerships to elect pass-through entity taxation, which can provide tax planning opportunities for owners. This election must be made annually and includes specific credit limitations.
Professional tax guidance
For complex Alabama tax situations, consulting with qualified tax professionals through an accounting firm directory can help ensure compliance and identify available tax-saving opportunities.
Frequently asked questions about Alabama 2027 tax deadlines
Q: When are Alabama state taxes due in 2027?
A: Alabama Individual income tax returns for tax year 2027 are due April 18, 2028, matching the federal deadline. C Corporations must file by May 18, 2028, one month after the federal due date. S Corporations and Partnerships must file by March 15, 2028.
Q: What is the Alabama tax extension deadline for 2027?
A: Alabama grants Individuals an automatic six-month extension to October 16, 2028, with no separate form required. C Corporations have until November 16, 2028, and S Corporations and Partnerships have until September 15, 2028. An extension is an extension to FILE, not an extension to PAY. Payment is still due by the original deadline.
Q: When are Alabama estimated tax payments due in 2027?
A: Estimated payments for tax year 2027 are due April 15, 2027, June 15, 2027, September 15, 2027, and January 18, 2028. You must make estimated payments if you expect to owe $500 or more in Alabama income tax after subtracting withholding and credits.
Q: Does Alabama require a separate state extension form?
A: No. Alabama grants extensions automatically. Individuals receive an automatic six-month extension, and businesses with a federal extension (Form 7004) receive the Alabama extension automatically. Any tax owed must still be paid by the original due date to avoid penalties and interest.
Q: What forms do Alabama businesses file for 2027?
A: C Corporations file Form 20C. S Corporations file Form 20S, and Partnerships file Form 65. Calendar-year pass-through entities also file Form PPT, the Business Privilege Tax Return, due March 15, 2028. Electronic filing is mandatory for C Corporations and pass-through entities.
Q: Is Social Security income taxable in Alabama?
A: No. Social Security benefits are fully exempt from Alabama state income tax. Military retired pay is also exempt, and many state and local government pensions receive favorable treatment.
Sources
- Alabama Department of Revenue Due Dates
- Alabama Corporate Income Due Date Extensions
- Alabama Revenue Online Services
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The material discussed on this page is meant for general illustration and/or informational purposes only and is not to be construed as investment, tax, or legal advice. You must exercise your own independent professional judgment, recognizing that advice should not be based on unreasonable factual or legal assumptions or unreasonably rely upon representations of the client or others. Further, any advice you provide in connection with tax return preparation must comply in full with the requirements of IRS Circular 230.
Please note that if any due date falls on a federal or state holiday or weekend, it may be adjusted to the next business day. Always verify current deadlines with the appropriate tax professional and authorities.
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