Idaho Paycheck Calculator 2026
State
Idaho (ID)
Tax Type
Flat Rate Tax
State Tax Rate
Flat 5.80%
Idaho State Income Tax Overview
Idaho imposes a flat state income tax rate of 5.80% on all taxable income. This means every dollar of your taxable income is taxed at the same rate, regardless of how much you earn.
How Idaho Taxes Work in 2026
Idaho levies a flat state income tax rate of 5.80% on all taxable income. A flat tax means every taxpayer pays the same percentage, regardless of income level, which simplifies tax filing. Idaho offers a standard deduction of $15,000 for single filers and $30,000 for married filing jointly. This deduction reduces your taxable income before the 5.80% rate is applied. In addition to the 5.80% state income tax, Idaho residents also pay federal income tax (10% to 37% based on income) and FICA taxes (6.2% Social Security + 1.45% Medicare).
Idaho Flat Tax Rate
Idaho applies a flat income tax rate of 5.80% on all taxable income, regardless of filing status or income level.
Standard deduction: $15,000 (single) / $30,000 (married filing jointly)