Idaho Tax Guide

⚠️ Important Disclaimer

This guide is for general informational purposes only and provides simplified overviews and estimates. It does not provide tax, legal, payroll, accounting, or financial advice.

Tax rules can change, and actual paycheck amounts may vary based on your employer, benefit elections, filing status, local taxes, deductions, credits, garnishments, and withholding elections. This guide does not cover every possible tax scenario.

For personalized tax advice, please consult a qualified tax professional.

For official guidance, review materials from the Idaho State Tax Commission and the Internal Revenue Service (IRS).

Last reviewed: June 2026

Idaho at a Glance

Idaho levies a flat income tax rate of 5.8% on all taxable income. The state conforms to the federal standard deduction of $16,100 (single) / $32,200 (MFJ).

Idaho does not tax Social Security benefits at the state level. The flat-rate structure simplifies paycheck withholding calculations.

Key Tax Facts for Idaho

State Income Tax

Flat 5.8%

Federal Brackets

10% – 37%

Social Security

6.2%

Medicare

1.45%

SS Wage Base

$184,500

Standard Deduction

$16,100 / $32,200

Idaho Income Tax Brackets (2026)

Idaho has a flat income tax rate of Flat 5.8%. All taxable income is taxed at the same rate regardless of how much you earn.

How Your Idaho Paycheck Is Calculated

Every paycheck goes through the same basic pipeline from gross pay to the net amount that hits your bank account:

Gross Pay — Your total earnings for the pay period. For hourly workers this is (hours × rate) plus any overtime or double-time premiums. For salaried employees it’s your annual salary divided by the number of pay periods.
Pre-Tax Deductions — Contributions to 401(k), 403(b), HSA, or FSA are subtracted before income taxes are calculated. These lower your taxable wages but Social Security and Medicare still apply to the full gross in most cases.
Federal Income Tax — Withheld using the IRS Publication 15-T percentage method based on your W-4 filing status, credits, and additional withholding elections. For 2026, rates range from 10% to 37%.
State Income Tax — Idaho withholds state income tax at rates of Flat 5.8% based on your annualized income and filing status. The standard deduction is $16,100 (single) / $32,200 (MFJ).
FICA Taxes — Social Security (6.2% on wages up to $184,500) and Medicare (1.45% on all wages). If your year-to-date earnings exceed the Social Security wage base, that portion stops being withheld.
Net Pay (Take-Home) — What’s left after all taxes and deductions. This is the amount deposited into your account each pay period.

Good to Know

Review your W-4 periodically. If you consistently receive a large refund, you may be over-withholding. Consider reviewing your W-4 Step 3 credits or Step 4(b) deductions to better align your withholding with your actual tax liability. The IRS Tax Withholding Estimator can help.
Benefits of contributing to a 401(k) or 403(b). Pre-tax retirement contributions can reduce your federal and state taxable income for the year. Even a modest percentage — say 3% to 6% — may noticeably lower your tax withholding while building long-term savings. Consult your plan administrator or a financial advisor for guidance.
Benefits of an HSA if you’re eligible. Health Savings Accounts offer a rare triple tax advantage — contributions lower your taxable income now, the balance grows tax-free, and withdrawals for qualified medical expenses are also tax-free. If you’re enrolled in a qualifying high-deductible health plan, an HSA is one of the most tax-efficient savings tools available.
Idaho tax note. Idaho has a flat income tax rate of 5.8% on all taxable income, following a transition from a graduated system.
Idaho tax note. Idaho uses the federal standard deduction ($16,100 single / $32,200 MFJ).
Idaho tax note. Idaho does not tax Social Security benefits at the state level.

Frequently Asked Questions

What is Idaho’s income tax rate?

Idaho has a flat income tax rate of 5.8% on all taxable income.

Does Idaho use the federal standard deduction?

Yes. Idaho conforms to the federal standard deduction of $16,100 for single filers and $32,200 for married filing jointly.

Does Idaho tax Social Security?

No. Idaho does not tax Social Security retirement benefits at the state level.

Sources

The information in this guide is based on the following official and publicly available sources. Always verify current rates and rules before making financial decisions.