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Idaho Paycheck Calculator

See exactly what you take home after federal taxes, Idaho state income tax, Social Security, and Medicare. Updated for 2026.

State tax: 5.8% SS: 6.2% Medicare: 1.45% 2026 brackets
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1099 freelancer note: You owe both halves of Social Security & Medicare — that's 15.3% self-employment tax on top of income tax. Quarterly estimated payments due Apr 15, Jun 16, Sep 15, Jan 15.
Idaho state income tax (2026) Idaho uses a flat 5.8% income tax rate.
Flat 5.8% on all taxable income

Idaho Income Tax Explained (2026)

Idaho has a state income tax with a flat 5.8% structure. Workers earning typical wages generally pay an effective state rate between 2.9% and 5.8% depending on income and deductions. Understanding how Idaho's tax works helps you accurately predict your take-home pay and plan your withholding.

Idaho residents also pay federal income tax (10%–37%), Social Security (6.2% up to $184,500), and Medicare (1.45%). The combination of federal and state taxes is the primary driver of the gap between your gross pay and your actual paycheck.

How Idaho compares to neighboring states

Montana
5.9% top rate
Similar range
Utah
4.85% flat
Lower
Oregon
Up to 9.9%
Much higher
Washington
No income tax
Zero tax

What taxes come out of a Idaho paycheck?

A Idaho W-2 employee's paycheck is reduced by federal income tax (progressive 10%–37%), Idaho state income tax (flat 5.8%), Social Security at 6.2% on wages up to $184,500, and Medicare at 1.45% on all wages. High earners above $200,000 also pay an additional 0.9% Medicare surtax on excess wages.

Idaho freelancers and 1099 contractors pay self-employment tax of 15.3% — covering both employee and employer portions of Social Security and Medicare — on top of both federal and state income taxes. Half of the self-employment tax is deductible from federal adjusted gross income, reducing the effective burden slightly. Idaho freelancers must also make quarterly estimated state tax payments.

Idaho tax tips for 2026

  • Flat rate: Idaho has a flat income tax rate of 5.8% on all taxable income above the standard deduction — straightforward to calculate and withhold.
  • Standard deduction: Idaho conforms to federal standard deductions ($13,850 single / $27,700 married in 2026), making it easier to estimate your Idaho taxable income.
  • Retirement income: Idaho does not have a broad pension exemption, but Social Security income is partially exempt based on federal taxability rules.
  • Estimated taxes: Idaho requires quarterly estimated payments if you expect to owe more than $500 in state tax. Use Idaho Form 51.

Frequently asked questions

Idaho has a flat 5.8% income tax rate on all taxable income. Idaho simplified from a multi-bracket progressive system to this flat rate in 2022. The 5.8% applies after Idaho's standard deduction (which aligns with the federal standard deduction), making it predictable for both employers withholding taxes and employees estimating their liability.
For a single filer earning $75,000 in Idaho in 2026, after the ~$13,850 standard deduction, taxable income is ~$61,150. At 5.8%, state tax is approximately $3,547. Combined with federal tax (~$10,294), Social Security ($4,650), and Medicare ($1,088), total deductions are ~$19,579. Take-home is approximately $55,421/year or ~$2,131 bi-weekly.
Idaho taxes most retirement income including IRA distributions and private pension income at the standard 5.8% flat rate. Social Security benefits follow federal rules — only the federally taxable portion of Social Security is also taxed by Idaho. Idaho does not offer a broad pension deduction for most retirees, making it less retiree-friendly than neighboring states like Washington (no income tax) or Montana (partial exemptions).
Washington has no state income tax, while Idaho has a 5.8% flat rate. On a $75,000 salary, an Idaho resident pays approximately $3,547 more in state income taxes than a Washington resident each year. However, Idaho has lower property taxes and a much lower cost of living than most of western Washington, which partially offsets the income tax difference.
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