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Kentucky Income Tax Calculator

Calculate your combined federal and Kentucky 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 Kentucky Income Tax Works

Kentucky 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 Kentucky have a standard deduction?
Kentucky'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 Kentucky's income tax in addition to federal tax?
Yes. You pay both federal income tax (progressive brackets up to 37%) and Kentucky's flat 4.00% state income tax. This calculator shows both combined for your total tax burden.
What is Kentucky's income tax rate?
Kentucky has a flat income tax rate of 4.00% 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.

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