Alabama Estimated Tax Payments 2026: Form 40ES Due Dates, the $500 Rule, and the Federal Tax Deduction

Alabama estimated tax payments for 2026 are due April 15, June 15, September 15, 2026, and January 15, 2027, and you must make them when you expect to owe at least $500 of Alabama income tax after withholding and credits. Three dates have passed, so the January 15, 2027 installment on Form 40ES is the one still open. The amount that keeps the Form 2210AL penalty off your return is the smaller of 90% of your 2026 Alabama tax or 100% of your 2025 tax (110% if your 2025 Alabama AGI topped $150,000).

Key takeaways:

• 2026 Form 40ES due dates: April 15, June 15, September 15, 2026, and January 15, 2027, the same calendar as federal Form 1040-ES
• The trigger is $500 or more of expected Alabama tax after withholding and credits
• Safe harbor: the smaller of 90% of 2026 tax or 100% of 2025 tax, rising to 110% when 2025 Alabama AGI exceeded $150,000 ($75,000 married filing separately)
• Rates run 2%, 4%, and 5%, and the 5% bracket starts at just $3,000 of taxable income ($6,000 joint), but you subtract your federal income tax before applying them
• Underpayments are charged on Form 2210AL at the federal underpayment rate: 7% for the fourth quarter of 2026

Save this cheat sheet — Alabama's 2026 numbers in one image.

When Are Alabama Estimated Tax Payments Due in 2026?

The 2026 Form 40ES instructions allow you to pay the year's estimate in full or in four equal installments:

If a 15th falls on a Saturday, Sunday, or state holiday, the due date moves to the next business day. Every date matches the federal Form 1040-ES schedule, so one reminder covers Montgomery and the IRS, and the estimated tax due dates tool lists both.

For 2027 the same rule gives April 15, June 15, September 15, 2027, and January 18, 2028: January 15, 2028 is a Saturday and Monday, January 17, is a state holiday (Martin Luther King Jr. Day). The 2027 vouchers were not yet published on October 29, 2026.

Alabama also lets you start late. The voucher schedule ties your first payment to the date you first met the requirement: by April 1, pay one-fourth on April 15; between April 1 and June 2, one-third on June 15; between June 1 and September 2, half on September 15; after September 1, the entire estimate on January 15, 2027. A freelancer whose income took off in October can file a first and only voucher in January. That schedule governs vouchers, not the penalty, as the Form 2210AL section explains.

Who Has to Pay Alabama Estimated Taxes?

The general rule in the 40ES instructions has two parts, and both must apply: you expect to owe at least $500 of 2026 Alabama tax after subtracting withholding and credits, and you expect withholding plus credits to fall short of the smaller of 90% of your 2026 tax or 100% of your 2025 tax.

The people who usually cross that line are freelancers with Schedule C profit and no withholding, partners and S corporation shareholders whose entity did not elect to pay the tax itself, landlords and investors, and retirees taking IRA or 401(k) distributions without Alabama withholding.

Nonresidents with Alabama-source income are covered too; Form 2210AL draws its numbers from either Form 40 or Form 40NR. W-2 employees with a modest side income often have an easier fix: extra withholding from the paycheck. Form 2210AL treats withheld tax as paid in equal amounts on the four due dates unless you elect to use the actual dates, so a December increase still covers April.

Alabama Income Tax Rates for 2026, and the Worksheet That Makes Them Smaller

Alabama taxes 2026 income at 2% on the first $500 of taxable income, 4% on the next $2,500, and 5% above $3,000; married couples filing jointly get double-width brackets, with 5% starting at $6,000. Those are the rates printed on the 2026 Form 40ES worksheet, and the state constitution caps the rate at 5%, per the Alabama Department of Revenue's income tax summary. No rate change for 2027 had been enacted as of October 29, 2026.

Line 3 of the worksheet is what makes Alabama unusual: you deduct your federal income tax liability, a right written into the state constitution by Amendment 225. The 2025 Form 40 booklet defines the deduction as the tax on line 22 of Form 1040 plus net investment income tax, minus refundable credits. Self-employment tax is not part of it.

Two more Alabama departures matter for freelancers. Alabama's list of adjustments to income has no line for half of self-employment tax, so Alabama AGI usually runs higher than federal AGI; itemizers instead deduct prior-year self-employment tax paid during the year on Schedule A. And the standard deduction shrinks as income rises: single filers get $3,000 up to $25,999 of Alabama AGI and $2,500 from $35,500; joint filers get $8,500 falling to $5,000. The personal exemption is $1,500 single and $3,000 joint.

Worked example. Beckett, a single freelance aerospace engineer in Huntsville, expects $90,000 of net Schedule C profit in 2026 and no withholding. His federal projection shows about $6,600 of income tax on Form 1040 line 22, after the standard deduction and the qualified business income deduction.

The federal deduction alone cuts Beckett's Alabama bill by $330 (5% of $6,600). His federal vouchers also carry 15.3% self-employment tax.

Alabama Safe Harbor Rules: 90%, 100%, or 110%

Alabama copies the federal design in IRC §6654. Your 2026 payments and withholding are large enough if they reach the smaller of:

The high-income test uses Alabama AGI, not federal AGI. Because Alabama skips the half-of-self-employment-tax adjustment, a self-employed person can sit just under $150,000 federally and just over it in Alabama.

Beckett's 2025 Alabama tax was $3,400 and his 2025 Alabama AGI was well under $150,000. His target is the lesser of 90% × $3,930 = $3,537 or 100% × $3,400 = $3,400, which is $850 per installment. If he paid $850 in April, June, and September, he owes $850 on January 15, 2027 and settles the last $530 with his 2026 Form 40 in April, penalty-free.

Size Your January 15 Installment

How to Pay Alabama Estimated Taxes Online or by Mail

My Alabama Taxes is the department's official online payment and filing system, and it accepts Form 40ES estimated payments. With an account, sign in, open the account panel, and click Make a Payment; you can also file the 40ES online there. Without an account, use the Make a Payment link in the Payments panel on the home page, which takes a payment without registration.

To pay by mail, print the 2026 Form 40ES voucher (it carries a 2D barcode, so fill it in on screen rather than by hand), attach a check payable to the Alabama Department of Revenue, and send it to Alabama Department of Revenue, Individual Estimates, P.O. Box 327485, Montgomery, AL 36132-7485. Use a separate voucher for each installment. The department does not send notices of estimated payments received, so the record table on the worksheet, or your bank history, is your only proof when you complete Form 40.

Alabama's $750 electronic-payment rule in Section 41-1-20 of the Code of Alabama is written for business taxpayers under Act 2006-552, so individuals may still mail a check with Form 40ES. Electing pass-through entities are a different story, as covered below.

Alabama Underpayment Penalty: Form 2210AL and the 2026 Rates

Alabama charges the underpayment penalty under Sections 40-2A-11 and 40-18-80 of its code, follows the IRC §6654 method per administrative rule 810-3-61-.09, and computes it on Form 2210AL. It works like interest: the underpayment for each quarter, times the days it stayed unpaid, times the federal underpayment rate. No penalty applies when your tax after withholding is under $500.

The rate follows 26 U.S.C. §6621 through Section 40-1-44 of the Alabama Code. The department's quarterly interest rate table lists 7% for the first quarter of 2026, 6% for the second, and 7% for the third and fourth. The 2025 form charged a flat 7% because that was the rate all year; the 2026 Form 2210AL had not been released as of October 29, 2026.

Suppose Beckett skipped his $850 September 15 installment:

The federal penalty on Form 2210 accrues in parallel for the same months, as our estimated tax penalty guide shows. Paying stops both clocks.

The late-start voucher schedule does not change the penalty math: Form 2210AL's regular method enters 25% of the required annual payment in every column. A freelancer who first owed tax in the fall and paid everything on January 15 avoids the penalty on the earlier quarters only by completing Schedule AI, the annualized income installment method, which requires 22.5%, 45%, 67.5%, and 90% of annualized tax for the four periods.

You do not have to compute the penalty yourself in most cases. If you only request a waiver, or filed jointly in one of the two years but not both, you attach page 1 of Form 2210AL and the department figures the charge and sends a bill. The 2025 instructions allow a waiver for a casualty, disaster, or other unusual circumstance, or when you retired after age 62 or became disabled and the underpayment had reasonable cause.

When Alabama Estimated Payments Do Not Apply

• Withholding covers the safe harbor. A W-2 employee whose Alabama withholding meets 90% of 2026 tax or 100% of 2025 tax needs no vouchers
• Your balance is under $500. Worksheet line 11 and Form 2210AL line 6 both stop at $500
• You farm. If at least two-thirds of your gross income comes from farming, you can make one payment by January 15, 2027, or skip estimates entirely by filing and paying in full by March 1, 2027; Form 2210AL scores farmers and fishermen on that single January installment at 66⅔% of tax
• Your income is mostly exempt retirement pay. Social Security, military retirement, and qualifying defined benefit pensions are excluded from Alabama income, so many retirees never reach $500

The first-year exception does NOT work like the federal one

The prior-year option needs a 2025 return that covered all 12 months. Someone who moved to Alabama in mid-2025 filed a part-year return, so the 100% route is closed for 2026 and only the 90% current-year test protects them.

Alabama Traps: Occupational Taxes, Electing PTEs, and Federal Tax

City and county occupational taxes are separate. Birmingham requires employers to withhold a 1% occupational tax from gross wages earned in the city, per the city's occupational tax return, and several other localities levy their own. None of it runs through Form 40ES, and Alabama itemizers can deduct it on Schedule A.

Electing pass-through entities pay on a December schedule. An S corporation or partnership that elects Alabama's entity-level tax under Act 2021-423 pays estimates on April 15, June 15, September 15, and December 15, per the department's electing pass-through entity FAQ, and any single payment of $750 or more must be electronic. Owners receive a refundable credit for their share, reported on Schedule CP, and Form 2210AL subtracts that credit before applying the 90% test, so an owner whose income comes mostly from an electing entity may have little left to cover with personal vouchers.

Federal tax moves your Alabama tax. A higher federal bill lowers Alabama tax by up to 5 cents per dollar, and the deduction uses 2026 federal liability, not federal payments. If your federal projection rises in December, your Alabama estimate falls slightly. Building Jupid, I keep meeting freelancers who estimate state tax as a flat percentage of profit; in Alabama that overstates the bill because it skips the standard deduction, the exemption, and the federal tax line. The Alabama quarterly tax calculator runs federal and state together, which is the only way to get line 3 right.

Across the state line, Georgia's estimated tax rules use the same four dates with a flat 4.99% rate for 2026.

Clean Books Before January 15: How Jupid Helps

Alabama's worksheet needs three numbers that drift all year: your profit, your federal tax, and what you already paid, since the department sends no payment notices. Jupid connects to your business bank accounts and categorizes every transaction with 95.9% accuracy, so year-to-date profit is current when the January voucher comes due. Ask the AI accountant in WhatsApp or iMessage what you have netted so far in 2026, or which estimated payments left your account and when, and the answer arrives in the chat with the transactions behind it. Try Jupid.

Sources

• 2026 Form 40ES instructions: $500 rule, due dates, safe harbor, 110% rule, farmers, mailing address
• 2026 Form 40ES voucher and worksheet: rate schedule, federal tax line, late-start voucher schedule
• 2025 Form 2210AL and instructions: required annual payment, Schedule AI, penalty computation, waivers
• Alabama Department of Revenue: Individual Income Estimated Taxes and Online Estimate Payments
• Alabama Department of Revenue: Quarterly Interest Rates: 7%, 6%, 7%, 7% for 2026
• 2025 Alabama Form 40 booklet: federal tax deduction worksheet, standard deduction chart, exemptions, exempt retirement income
• Alabama Department of Revenue: Individual Income Tax: rates, 5% constitutional cap, Amendment 225
• Alabama Department of Revenue: Electing Pass-Through Entities and Electronic Funds Transfer FAQs
• Alabama Admin. Code r. 810-3-61-.09: estimated tax penalty under 26 U.S.C. §6654
• City of Birmingham occupational tax return: 1% withholding on wages
• IRS Publication 505, IRC §6654, and IRC §6621: the federal rules Alabama follows

This guide is for general educational purposes and does not constitute tax, legal, or accounting advice. It reflects the 2026 Form 40ES, the 2025 Form 2210AL and Form 40 booklet, and Alabama Department of Revenue guidance. Reviewed 2026-10-29. Alabama's underpayment rate follows the federal rate each quarter, and local occupational taxes vary by city and county. For advice specific to your situation, consult a qualified tax professional or the Alabama Department of Revenue at revenue.alabama.gov.