The Alabama capital gains tax works differently from the federal version in one big way: the state does not give long-term gains a preferential rate. Alabama treats every capital gain as ordinary income and applies its regular graduated brackets, which top out at 5%. The most important offset is that Alabama lets you deduct the federal income tax you paid, which meaningfully lowers your effective state rate on a large gain.
The Rate You’ll Actually Pay
Federal law splits capital gains into short-term (taxed as ordinary income) and long-term (taxed at 0%, 15%, or 20%). Alabama ignores that split. Whether you held an asset for thirteen months or thirteen years, the gain drops into your Alabama taxable income and runs through the standard brackets.1Alabama Legislature. Alabama Code 40-18-5 – Tax on Individuals
Those brackets are compressed. For single, head of family, or married-filing-separately filers, the 2% rate applies to the first $500 of taxable income, 4% runs from $501 to $3,000, and everything above $3,000 is taxed at 5%. For married joint filers, the thresholds double: 2% on the first $1,000, 4% up to $6,000, and 5% above that.
Anyone with a capital gain large enough to plan around is almost certainly past the 5% threshold from wages or other income alone. The lower brackets save a total of $35 for single filers and $70 for joint filers before the 5% rate kicks in. For planning purposes, treat the state rate on your gain as a flat 5% before deductions.
Alabama does follow the federal definition of a capital asset and the federal method of calculating the gain. Your starting figure is the same one you use on your federal return. Only the rate differs.
Deducting Your Federal Tax on the Gain
This is the single most valuable feature of Alabama’s tax code for anyone realizing a large gain. Section 40-18-15 of the Alabama Code lets you deduct the federal income tax you actually paid or accrued during the year from your Alabama taxable income.2Alabama Legislature. Alabama Code 40-18-15 – Deductions for Individuals Generally
Consider a $100,000 long-term gain that generates $15,000 of federal tax. That $15,000 comes out of your Alabama taxable income, so the state effectively reaches only about $85,000 of the gain before other deductions. At a 5% rate, the federal-tax deduction alone saves you $750 on that transaction. The larger your gain and the higher your federal bracket, the more this benefit compounds.
The deduction covers all federal income tax paid or accrued during the year, not just the tax attributable to your capital gain. If a large gain also lifts your ordinary income into a higher federal bracket, the full increased federal bill is deductible for Alabama purposes. Nonresidents may claim the deduction as well, but only in proportion to the share of their total income that comes from Alabama sources.
Deductions and Exclusions That Shrink the Gain
Alabama has its own standard deduction, separate from the federal one. Under the optional increased standard deduction, single filers can claim at least $2,250 and joint filers at least $4,500, with the exact amount varying based on adjusted gross income.3Alabama Legislature. Alabama Code 40-18-15.7 – Optional Increased Standard Deduction Personal exemptions run $1,500 for single or married-filing-separately filers and $3,000 for joint or head-of-family filers.4Alabama Department of Revenue. What Personal Exemptions Am I Entitled To? Because a capital gain simply becomes part of your Alabama taxable income, these reduce the tax on the gain the same way they reduce tax on wages.
Selling your home is the biggest exclusion most people encounter. The federal exclusion under Internal Revenue Code Section 121, up to $250,000 of gain for single filers and $500,000 for joint filers, carries over to Alabama.5Internal Revenue Service. Publication 523, Selling Your Home The Alabama Department of Revenue has confirmed that gain excluded from federal adjusted gross income under Section 121 is also excluded from Alabama AGI.6Alabama Department of Revenue. Withholding on Sales/Transfers of Real Property and Associated Tangible Personal Property by Nonresidents FAQs A loss on the sale of a personal residence, though, is not deductible on either return. That asymmetry catches some homeowners off guard.
Capital Losses: Better in One Way, Worse in Another
Alabama’s loss rules cut two directions, and most people only hear about the good half.
The good half: federal law caps the net capital loss you can deduct against ordinary income at $3,000 per year, or $1,500 if married filing separately.7Office of the Law Revision Counsel. 26 USC 1211 – Limitation on Capital Losses Alabama does not impose that cap. A $20,000 net loss can wipe out $20,000 of your other Alabama income in the same year.
The other half: federal rules let unused losses carry forward indefinitely to future tax years. Alabama generally requires losses to be used in the year they occur. If a net capital loss exceeds all your other Alabama income in a low-income year, the excess does not roll forward the way it does federally. Timing matters here. A large loss taken in a year with little other income can be partially wasted for Alabama even though it lives on for federal purposes.
Quarterly Estimated Payments
Alabama expects estimated tax payments during the year if a capital gain (or anything else) will push your Alabama liability to $500 or more after withholding and credits.8Alabama Department of Revenue. Individual Income Estimated Taxes The state follows the federal estimated tax framework under 26 U.S.C. ยง 6654, substituting $500 for the federal threshold.9Alabama Legislature. Alabama Code 40-18-80 – Estimated Income Tax
Deadlines track the federal calendar: April 15, June 15, September 15, and January 15 of the following year. Sell an appreciated asset mid-year and you’re expected to remit an estimated payment by the next quarterly deadline, not to wait until you file. Missing the payment triggers an underpayment penalty at a 7% annual rate on the shortfall, prorated by the days late.
Two safe harbors let you avoid the penalty even after a big gain. You’re covered if you had no Alabama tax liability the prior year, or if your withholding and estimated payments cover at least 100% of last year’s Alabama tax. Both mirror the federal rules.
If You Don’t Live in Alabama
Alabama only taxes nonresidents on income sourced to the state, and the sourcing rules for capital gains depend on what you sold.
Real estate sitting in Alabama is Alabama-source income. A nonresident who sells Alabama land, a rental house, or a vacation home owes state tax on the gain and reports it on Form 40NR, the nonresident return.
Intangible property is different. Gains on stocks, bonds, mutual funds, and similar assets are sourced to the state where the seller lives, not where the issuer is based. A former Alabamian who sells shares after moving to Georgia does not owe Alabama tax on the gain, even if the company is headquartered in Birmingham.
Withholding When a Nonresident Sells Real Estate
When a nonresident closes on Alabama real estate, the buyer must withhold part of the proceeds and send it to the Alabama Department of Revenue. Individual buyers withhold 3% of the purchase price; corporate, partnership, and other entity buyers withhold 4%. If the seller provides a sworn affidavit stating the amount of gain to be recognized, the withholding applies to the gain rather than the full purchase price, which is a significant reduction when the cost basis is high.10Alabama Legislature. Alabama Code 40-18-86 – Sale or Transfer of Real Property and Associated Tangible Property by Nonresidents
Several common sales are exempt from withholding: any transaction under $300,000, the seller’s principal residence qualifying under IRC Section 121, like-kind exchanges under Section 1031 where gain is realized but not recognized, and foreclosures or deeds in lieu of foreclosure.11Alabama Department of Revenue. Exemptions from Nonresident Withholding Requirement on Sales of Real Property
The withholding is an advance payment, not a final tax. When the nonresident files Form 40NR, the amount withheld is credited against actual Alabama liability, and any excess comes back as a refund.
How to Report the Gain
Alabama residents report capital gains on Schedule D of Form 40. Each sale of stock, real estate, or other capital asset gets listed with its sale price, cost basis, and resulting gain or loss. The structure mirrors the federal Schedule D. The net figure flows into your Alabama taxable income.
Nonresidents use Form 40NR and report only Alabama-source gains. For calendar-year filers, the return is due April 15 of the following year, the same date as your federal return. Any balance owed beyond what was withheld or paid in estimates is due with the return.