StructureCost2026

Quarterly estimated tax in Idaho (2026)

A sole proprietor in Idaho with $100,000 of profit pays the IRS about $5,032 a quarter, and owes $3,817 of Idaho 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).

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

IRS dueIncome earnedIRS
April 15, 2026January 1 to March 31$5,032
June 15, 2026April 1 to May 31$5,032
September 15, 2026June 1 to August 31$5,032
January 15, 2027September 1 to December 31$5,032
Year$20,128

Idaho income tax on this profit: $3,817. It does not use four set quarterly installments, so check the state's own estimated tax page. coopernorman.com, checked Oct 23, 2026 Estimates assume a single-member business with no withholding.

Idaho estimated tax rules for 2026

Payments at each profit

ProfitIRS each quarterIdaho for the year
$50,000$2,190$1,220
$100,000$5,032$3,435
$150,000$8,462$5,652
$250,000$14,931$10,222
$500,000$37,687$21,988

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.

More for Idaho

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