Alabama state income tax is a graduated tax on residents’ worldwide income and non-residents’ Alabama-sourced income, with rates of 2%, 4%, and 5% and a top rate that kicks in at just $3,000 of taxable income for single filers and $6,000 for joint filers. The state has a few unusual features you should know before filing: you can deduct the federal income taxes you paid, Social Security and most government pensions are fully exempt, and the standard deduction shrinks as your income grows.
Alabama Income Tax Rates
Alabama uses three brackets. For single filers, heads of family, and those married filing separately:
- 2% on the first $500 of taxable income
- 4% on the next $2,500 (from $501 to $3,000)
- 5% on everything above $3,000
For married couples filing jointly:
- 2% on the first $1,000
- 4% on the next $5,000 (from $1,001 to $6,000)
- 5% on everything above $6,000
Because the top rate arrives so quickly, most filers with moderate incomes pay an effective rate close to 5%.1Alabama Department of Revenue. What is Alabama’s Individual Income Tax Rate
Who Has to File
You are an Alabama resident if you are domiciled in the state, or if you keep a permanent home there and spend more than seven months of the tax year in Alabama.2Alabama Legislature. Alabama Code Title 40-18-2 – Levied; Persons and Subjects Residents file Form 40. The gross income thresholds that trigger a filing requirement are:
- Single: $4,000
- Head of family: $7,700
- Married filing jointly: $10,500
- Married filing separately: $5,250
Non-residents with Alabama-sourced income file Form 40NR if their Alabama income exceeds their prorated personal exemption. Part-year residents file if their gross income met the threshold during the period they lived in the state.3Alabama Department of Revenue. Who Must File an Alabama Individual Income Tax Return
Non-residents owe Alabama tax only on income earned inside the state, which includes wages for work physically performed in Alabama and rental income from Alabama property. Pay for services performed entirely outside Alabama is not taxable, even if the employer is based in the state.4Legal Information Institute (LII). Alabama Code 810-3-14-.05 – Gross Income of Nonresidents
How Alabama Figures Your Taxable Income
Alabama starts with your federal adjusted gross income, then applies its own modifications. The largest of these is the deduction for federal income tax paid, which is available in only a handful of states. If you paid $8,000 in federal income tax during the year, you subtract that amount when calculating your Alabama income.5Alabama Administrative Code. Alabama Administrative Code Rule 810-3-15-.20 – Federal Income Tax Deduction – Individuals Interest earned on U.S. government obligations, such as Treasury bonds, is also excluded. Non-residents get a prorated version of the federal tax deduction based on the share of their income that is Alabama-sourced.
Standard Deduction
Alabama’s standard deduction is unusual because it phases down as your income rises. At the top, single filers can claim up to $3,000 and joint filers up to $8,500. Once adjusted gross income passes roughly $26,000, the deduction starts shrinking: by $25 for every additional $500 of AGI for single filers (with a floor of $2,500), and by $175 for every additional $500 of AGI for joint filers (with a floor of $5,000).
Personal and Dependent Exemptions
The personal exemption is $1,500 for single filers and those married filing separately, and $3,000 for joint filers and heads of family.1Alabama Department of Revenue. What is Alabama’s Individual Income Tax Rate The dependent exemption is tiered:
- AGI of $50,000 or less: $1,000 per dependent
- AGI of $50,001 to $100,000: $500 per dependent
- AGI above $100,000: $300 per dependent
Retirement Income and Other Exempt Income
Social Security benefits are fully exempt from Alabama income tax. So is a broad list of government-funded retirement pay, including military retirement, U.S. Civil Service retirement, Alabama state employee and teacher retirement, TVA pension benefits, federal railroad retirement, and Veterans Administration disability payments. Retirement benefits paid by any Alabama firefighting agency or police retirement system are exempt as well.6Alabama Department of Revenue. Income Exempt from Alabama Income Taxation
For other taxable retirement income, such as distributions from a 401(k) or a traditional IRA, filers age 65 and older can exclude up to $6,000 per person. A married couple where both spouses are 65 or older can exclude up to $12,000 combined.
Credit for Taxes Paid to Another State
If you live in Alabama and earn income in another state that also taxes it, Alabama gives you a credit for the income tax you actually paid to that other state on that income. The credit is capped at the Alabama tax that would have been owed on the same income, so it prevents double taxation without wiping out your Alabama liability entirely.7Alabama Legislature. Alabama Code Title 40-18-21 – Credits for Taxes Paid on Income From Sources Outside State
Filing, Paying, and Refunds
Alabama returns are due April 15, the same as the federal return. When April 15 falls on a weekend or holiday, the deadline moves to the next business day.8Alabama Department of Revenue. When Should I File My Alabama Individual Income Tax Return
You can file electronically through approved third-party software or through the state’s own portal, My Alabama Taxes (MAT), at myalabamataxes.alabama.gov. Paper returns are still accepted by mail. Payments can be made through MAT via ACH debit, by credit or debit card (a third-party convenience fee applies), or by mailing a check or money order with payment voucher Form 40V.9Alabama Department of Revenue. Due Dates
Wait at least six weeks after filing before checking on a refund through the MAT portal. If eight to ten weeks pass without a refund, the Department of Revenue may have stopped it for review and will send a letter asking for more information or identity verification.10Alabama Department of Revenue. Where’s My Refund Because I Have Not Received It Yet
Extensions and Amended Returns
Alabama automatically grants a six-month filing extension to October 15. No form is required.11Alabama Department of Revenue. Can I Apply for an Extension to File My Return The extension only covers paperwork. If you owe tax, payment is still due April 15, and interest runs on any unpaid balance from that date.
To amend a return, file a new Form 40 with the “Amended” box checked and include a detailed explanation of the changes, along with corrected copies of any affected schedules. Account for any refund you already received or any payment you already made when working out the new numbers. Amended returns are mailed to the Alabama Department of Revenue.12Alabama Department of Revenue. How Do I File an Amended Return
Estimated Tax Payments
If you expect to owe $500 or more in Alabama tax after withholding and credits, you generally need to make quarterly estimated payments using Form 40ES. The due dates are:
- First quarter: April 15
- Second quarter: June 15
- Third quarter: September 15
- Fourth quarter: December 15
Note the fourth-quarter deadline. It is a full month earlier than the federal January 15 estimated tax deadline, so it is easy to miss if you copy your federal schedule.13Alabama Department of Revenue. When Are Estimated Tax Payments Due Underpaying by $500 or more can trigger a penalty.
Penalties and Interest
Late filing and late payment carry separate penalties, and both can apply at once. The failure-to-file penalty is 10% of the additional tax due after prepayments, with a minimum of $50.14Legal Information Institute (LII). Alabama Administrative Code Rule 810-14-1-.30.01 – Penalty for Failure to Timely File Tax The failure-to-pay penalty is also 10% of any tax not paid by the due date.
Interest accrues on unpaid balances from the original due date at the federal underpayment rate set by the U.S. Treasury, which is adjusted quarterly and applies to both underpayments and overpayments.15Alabama Legislature. Alabama Code Title 40-1-44 – Interest on Delinquent Taxes and Overpayments Even if you file on extension, pay what you owe by April 15 to stop both the payment penalty and the interest.
Homebuyer Savings Account Deduction
Alabama offers a targeted deduction for first-time and second-chance homebuyers who open a designated savings account for a down payment and closing costs on an Alabama home. You can deduct up to $5,000 per year as a single filer, or $10,000 as a joint filer, and earnings in the account grow tax-free as long as the program’s requirements are met. The deduction is available for the five years in which you make deposits into the account.16Alabama Department of Revenue. What is the Alabama First Time and Second Chance Home Buyer Savings Account