Alabama Form 40 (full-year resident): how I do it
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Alabama Form 40 (full-year resident): how I do it
Form 40 is the Alabama individual income tax return for someone who was a legal resident of Alabama for the entire tax year. A resident reports income from all sources, wherever earned, unless Alabama specifically exempts it. It covers the calendar year and is due on the same date as the federal return.
Who this is for
Full-year Alabama residents. You must use Form 40 if you're a full-year resident who itemizes, or who doesn't meet every condition for the short Form 40A.
You may use Form 40A instead only if all of these hold: full-year resident, not itemizing, no adjustments to income (no IRA deduction, alimony paid, or prior-year federal tax), no income other than salaries and wages except interest and dividends not exceeding $1,500, no business income or loss from federal Schedules C, D, E or F, and not claiming credit for taxes paid to another state.
This Guide does not cover part-year residents or nonresidents — those are a different return and a different allocation, and a part-year resident who also had Alabama-source income while a nonresident may need both Form 40 and Form 40NR. Send elsewhere: multi-state residency disputes, foreign income and treaty positions, and anyone with an open Alabama audit or collections matter.
Before you start, ask the client Were you a legal resident of Alabama for the whole of the year, and did you move at any point? Filing status at December 31, and your spouse's residency. Alabama is not a community property state, and you cannot file a joint Alabama return if you're a resident and your spouse is a resident of another state — that's married filing separate. Did you have income taxed by another state, or by a foreign country? Any income not on a W-2 or 1099 — rents, royalties, gains on sales of property, K-1s, farm? Did you make Alabama estimated payments or an extension payment, and how much? Any out-of-state purchases on which no sales tax was collected? The method, step by step Finish the federal return first. The Alabama return depends on it in two directions: figures flow up from it, and the federal income tax deduction on line 12 depends on the federal liability. Working Alabama before the federal return is settled means reworking it. Confirm full-year residency before you touch a number. If the client moved during the year you're on the wrong form, and everything downstream is wasted. Set filing status and personal exemption on lines 1–4, carrying the exemption to line 13. Head of family has its own tests — not married at the close of the tax year, not a surviving spouse, and more than half the cost of keeping up a home for a qualifying individual for the required period. Build income, lines 5–8. Report all W-2 information on Schedule W-2. If the client earned wages in more than one state, include the total state wages from all states. If taxable and nontaxable interest and dividends are $1,500 or more, complete Schedule B. Other income — rents, royalties, gains, anything not in the state wages box — goes on line 7 with page 2, Part I and the supporting federal schedules attached. Watch what is not Alabama withholding. Do not treat federal income tax, FICA, local or occupational tax, or tax paid to another state as Alabama tax withheld. This is a common source of notices. Take adjustments on line 9, then compute Alabama adjusted gross income on line 10. Choose itemized or standard on line 11, and compute it both ways. Check box a and attach Schedule A to itemize; check box b for the standard deduction and use the chart, which is keyed to Alabama AGI on line 10, not federal AGI. The federal choice does not control Alabama. If you take the standard deduction and later want to itemize, you can amend. A dependent or student may take the standard deduction even if claimed as a dependent by someone else. Compute the federal income tax deduction on line 12 using the worksheet in the booklet, and attach page 1, page 2 and Schedule 1 of the federal return. Use the actual federal liability, not withholding. Where a couple files a joint federal return and separate Alabama returns, the federal liability is apportioned by the ratio of each spouse's Alabama AGI to total joint federal AGI. Apply the personal exemption (line 13) and dependent exemption (line 14). The dependent exemption is per dependent and steps down with Alabama AGI. A dependent must be a defined relative who received over 50% of support from the taxpayer — and where a joint return is filed, support may come from either spouse. Complete Schedule DS and attach it before filling page 2, Part III. Figure the tax from the Tax Table on taxable income at line 16, using the filing status you checked. If there's a net operating loss carryover or carryback, you cannot use the table — indicate the method and attach Form NOL-85A. Apply credits on Schedule OC, checking the box to show you've used it. Credit for taxes paid to another state goes on Schedule CR with the other state's return attached; it's available only to legal residents on income taxed by both states for the same period, and it's limited to the lesser of the tax actually paid to the other state or the tax on that income at the Alabama rate. No credit where the out-of-state income is fully offset by a corresponding deduction. Foreign country tax goes to Section B, Part I of Schedule OC instead. Pick up additional taxes on Schedule ATP, including consumer use tax on out-of-state purchases. If there were none, enter zero and check the box — leaving it blank invites a query. Reconcile payments before you sign: Alabama withholding per Schedule W-2, estimated payments per the client's records and the state account, any extension payment on Form 40V, and any prior-year overpayment applied forward. These must tie. File electronically and keep the acknowledgment. Direct deposit is not available on a blank paper Form 40, and refunds cannot be deposited to or through a foreign financial institution — those get a paper check. The traps The client who says "I live in Alabama" and moved in April. Nobody asks when, the resident return goes out, and the whole allocation is wrong. Ask the date, not the state. Assuming the federal itemize/standard choice carries over. It doesn't, and the Alabama standard deduction is driven by Alabama AGI on a phase-down chart, so the answer genuinely differs from the federal one more often than people expect. Computing the federal income tax deduction off withholding instead of actual liability. It's the distinctive Alabama line and the one software and AI get wrong most often, particularly on joint-federal/separate-Alabama returns where the ratio method applies. Missing the credit for taxes paid to another state, or computing it on the wrong base. It is limited to the lesser of the other state's tax and the Alabama tax on the same income, and it isn't allowed at all where a deduction already offsets the income. Treating local or occupational tax as Alabama withholding, which overstates payments and produces a mismatch letter. Claiming estimates the state has no record of. Pull the account before filing, not after the notice. Assuming the automatic extension protects against interest. It only avoids the late-filing penalty. Interest runs from the original due date regardless, and the failure-to-pay penalty still applies. Rates, thresholds and deadlines What Value Source Filing threshold, full-year resident (gross income) Single $4,500 · Head of family $8,200 · Married filing joint $11,500 · Married filing separate $5,750 2025 Form 40 Booklet, p.5 Personal exemption Single $1,500 · Married filing joint $3,000 · Married filing separate $1,500 · Head of family: confirm before filing 2025 Form 40 Booklet, p.6 (line 13) Personal exemption, dependent or student $1,500 2025 Form 40 Booklet, p.5 Dependent exemption, per dependent, by Alabama AGI (line 10) $0–50,000 → $1,000 · $50,001–100,000 → $500 · over $100,000 → $300 2025 Form 40 Booklet, p.10 Standard deduction, married filing joint $8,500 at Alabama AGI $0–25,999, stepping down in bands to $5,000 at $35,500 and above 2025 Form 40 Booklet, p.9 chart Standard deduction, married filing separate $4,250 stepping down to $2,500 at $17,750 and above 2025 Form 40 Booklet, p.9 chart Standard deduction, head of family $5,200 stepping down to $2,500 at $35,500 and above 2025 Form 40 Booklet, p.9 chart Standard deduction, single $3,000 stepping down to $2,500 at $35,500 and above 2025 Form 40 Booklet, p.9 chart Schedule B trigger Taxable and nontaxable interest and dividends of $1,500 or more 2025 Form 40 Booklet, p.8 Federal income tax deduction Allowed; computed on the booklet worksheet, with federal pages 1 and 2 and Schedule 1 attached 2025 Form 40 Booklet, p.8 (line 12), p.31 Tax computation Tax Table on taxable income at line 16 by filing status 2025 Form 40 Booklet, p.25 Rate schedule Confirm before filing — not stated in the booklet Citation to confirm Filing deadline Same date as the federal return 2025 Form 40 Booklet, p.5 Automatic extension Automatic to October 15, 2026, with no form to file. Pay with Form 40V, "Automatic Extension Payment" box checked, by the federal due date. Time to file only, not time to pay 2025 Form 40 Booklet, p.5, p.18 Refund claim window Original returns must be filed within two years of the date the tax was paid 2025 Form 40 Booklet, p.5 Estimated tax Required where at least $500 of tax is expected for the following year; Form 40ES. Below $500, no estimate required 2025 Form 40 Booklet, p.18 Underpayment penalty Applies where tax due is $500 or more and withholding plus timely estimates was less than the smaller of 90% of the current year's tax (66⅔% for farmers) or 100% of the prior year's tax, the prior year being a 12-month period. Form 2210AL 2025 Form 40 Booklet, p.17 Failure to timely file 10% of the tax due or $50, whichever is greater. Does not apply to a return showing no tax due or a refund 2025 Form 40 Booklet, p.17 Failure to timely pay 1% of the unpaid amount for each month or fraction of a month unpaid, maximum 25% 2025 Form 40 Booklet, p.17 Interest The same rate as currently prescribed by the Internal Revenue Service, running from the due date even where an extension was granted 2025 Form 40 Booklet, p.17 ABLE account deduction Up to $5,000 per individual per year, §40-18-15.8 2025 Form 40 Booklet, p.17 Criminal liability §40-29-112, Code of Alabama 1975 2025 Form 40 Booklet, p.17 Sources Alabama Department of Revenue, 2025 Alabama Individual Income Tax Return Form 40 Booklet (25f40bk) Credit for taxes paid to a foreign country: Alabama Administrative Rule 810-3-21-.03 §40-18-15.8 and §40-29-112, Code of Alabama 1975
Contributed by Anthony Bandura, AL-10921.
Other Alabama computations in the OpenAccountants Tax Library.
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