Idaho Income Tax Calculator

At a glance

Everything below is for tax year 2026 and a single filer unless stated otherwise. Rates, brackets and deductions come from the Tax Foundation tables in force on January 1, 2026, as amended by state laws enacted through June 2026; federal amounts come from IRSRevenue Procedure 2025-32.

Verified: October 6, 2026. How we calculate · A figure looks wrong? Report it

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Paycheck examples

Four salaries, all computed by this site's own engine: single filer, paid every two weeks, no 401(k) deferral, no health premiums and no local tax. “Take-home” is what lands in the account each payday after every withholding below.

Payroll taxes on an Idaho paycheck

A $75,000 salary paid every two weeks, single filer, no 401(k) deferral, no health premiums and no local tax. Each line below comes off the gross before the money lands; the last column is what that line costs out of every dollar earned.

Payroll taxes come in two halves. The table above is the employee half — what is withheld from you. The employer half is paid on top of your salary and never shows up on a pay stub: a matching share of Social Security and Medicare, federal unemployment insurance (FUTA) and Idaho's own unemployment insurance. It changes what you cost to employ, not what you take home, and this calculator does not model it. Working for yourself means carrying both halves — the 1099 calculator prices that in.

Withholding forms and payroll rules in Idaho

What decides each line above: the certificate you file, the deductions it produces, and any local tax stacked on top.

• Idaho uses its own Form ID W-4, the Employee's Withholding Allowance Certificate, which employees complete alongside the federal W-4 kept on file for the same job.
• Idaho withholding follows the status and allowances on the ID W-4; if none is returned, the employer withholds as though no exemptions were claimed.
• An exemption claimed on the ID W-4 is good only for the current year, so employees must hand in a fresh ID W-4 every year to keep it.
• Qualifying military spouses can give employers Form ID-MS1, the Idaho Military Spouse Withholding Exemption Certificate, which stops Idaho withholding and must be renewed annually.

Source: Idaho State Tax Commission, last verified October 27, 2026. A figure looks wrong? Report it

Hourly pay in Idaho

Hourly wages are annualised the way the hourly-to-salary converter does it: 40 hours a week for 52 weeks, or 2,080 hours a year. The take-home column runs through the same engine as every other table on this page.

An extra dollar an hour is worth $2,080 of gross pay a year. At $35 an hour the total effective tax rate is 21.6%, which leaves $27.42 of every hour worked in the account.

Take-home by pay frequency

The same $100,000 salary, paid the four ways the calculator supports, under the assumptions above. Moving the payday changes the size of each deposit, never the yearly totals.

More scenarios at $100,000

Two setups readers ask about most, beside the single-filer baseline above: filing jointly, and deferring 6% of pay into a 401(k). Both stay biweekly, with no premiums and no local tax.

A 401(k) lowers the wages federal and Idaho income tax are figured on, but Social Security and Medicare stay charged on the full salary — and the deferral itself still leaves every paycheck, so take-home drops by the deferral minus the tax it saved.

Real-world worker profiles in Idaho

How different career stages and family setups fare under Idaho's tax rules:

Brackets and deductions

A single rate applies to every dollar of state-taxable income: The Idaho standard deduction of $16,100 (single) or $32,200 (married) comes off first.

What we do not model

For Idaho: Taxable income starts from federal taxable income (after the federal standard deduction). The figures above exclude local and municipal income taxes, tax credits, dependent exemptions and credits, itemized deductions, additions for age or blindness, income-specific exemptions such as tips and overtime, phase-outs, alternative minimum tax, state disability insurance, and the Form W-4 details that change real withholding. They are an estimate, not tax advice — see the full disclaimer for what the model does and does not cover. The method shows how each figure above is calculated.

Common questions

Want to run the numbers yourself? Open the calculator with Idaho selected, put any second state next to it, or browse income tax in all 50 states — including its rank on a $100,000 salary, cheapest first.