secure moneyMATH

Idaho Income Tax Calculator

Calculate your combined federal and Idaho state income tax for 2025

Don't know your taxable income? Calculate it from gross income

Federal standard deduction (single): $15,750

Estimated taxable income: $0

How Idaho Income Tax Works

Idaho uses a flat income tax rate applied to all taxable income regardless of amount. This is added on top of your federal income tax, which uses progressive brackets. Your combined effective rate reflects both taxes together.

Frequently Asked Questions

Does Idaho have a standard deduction?
Idaho's deduction rules vary. Some flat-tax states conform to the federal standard deduction, while others have their own. Check your state tax authority for details.
Is Idaho's income tax in addition to federal tax?
Yes. You pay both federal income tax (progressive brackets up to 37%) and Idaho's flat 5.30% state income tax. This calculator shows both combined for your total tax burden.
What is Idaho's income tax rate?
Idaho has a flat income tax rate of 5.30% applied to all taxable income regardless of how much you earn.

Important Considerations

  • • This calculator estimates federal + state income tax only. It does not include FICA, local taxes, or other deductions.
  • • State tax brackets shown are for single filers. Some states have different brackets for married filers.
  • • Some states allow deductions for federal taxes paid, which is not reflected here.
  • • This is for educational purposes only and is not tax advice.

Resources