Quarterly estimated tax in Alabama (2026)

A sole proprietor in Alabama with $100,000 of profit pays the IRS about $5,032 a quarter, and owes $4,382 of Alabama income tax for the year. Put in your own profit to get the four payments and their dates.

$5,032 a quarter

to the IRS. Four payments make $20,128 for the year, which meets 90% of this year's tax. This year's federal tax on this profit: $22,365 (income tax $8,235, self-employment tax $14,130).

Alabama, 2026: $100,000 profit, single filer

IRS due	Income earned	IRS	Alabama due	Alabama
April 15, 2026	January 1 to March 31	$5,032	April 15, 2026	$986
June 15, 2026	April 1 to May 31	$5,032	June 15, 2026	$986
September 15, 2026	June 1 to August 31	$5,032	September 15, 2026	$986
January 15, 2027	September 1 to December 31	$5,032	January 15, 2027	$986
Year		$20,128		$3,944

Alabama payments cover 90% of this year's state tax of $4,382, split 25%, 25%, 25%, 25% (Form 40ES). revenue.alabama.gov, checked Oct 20, 2026 Estimates assume a single-member business with no withholding.

Alabama estimated tax rules for 2026

If your Alabama tax after withholding comes to $500 or more, the state wants estimatesrevenue.alabama.gov, checked Oct 20, 2026.
Pay by April 15, 2026, June 15, 2026, September 15, 2026, January 15, 2027revenue.alabama.gov, checked Oct 20, 2026.
You avoid the penalty by paying 90% of this year's tax, or 100% of last year's (110% if last year's income topped $150,000)revenue.alabama.gov, checked Oct 20, 2026.
Send them with Form 40ES, or pay on the state's website.

Payments at each profit

Profit	IRS each quarter	Alabama for the year
$50,000	$2,190	$1,852
$100,000	$5,032	$3,944
$150,000	$8,462	$6,035
$250,000	$14,931	$10,346
$500,000	$37,734	$21,445

A sole proprietor or single-member LLC, single filer, no withholding, paying 90% of this year's federal tax and the state's own safe-harbor share.

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