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Kentucky Income Tax Calculator

Calculate your combined federal and Kentucky state income tax

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

Federal standard deduction (single): $16,100

Estimated taxable income: $0

⚠️ This calculator provides estimates for educational purposes only. It is not financial, tax, or legal advice. Your actual results may vary.

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.
How does Kentucky's flat tax work?
Kentucky uses a flat 3.50% rate on all taxable income. Unlike progressive systems, every dollar is taxed at the same rate regardless of how much you earn.
Is Kentucky's income tax in addition to federal tax?
Kentucky's income tax rate is 3.50% (flat rate). Since it's a flat tax, this is both your marginal and effective state rate.

Important Considerations

  • • This calculator estimates federal + state income tax only. It does not include FICA, local taxes, or other deductions.
  • • Your filing status affects federal brackets and standard deduction. State brackets shown use single-filer thresholds; some states have wider brackets for joint filers, which may result in slightly lower state tax.
  • • Some states allow deductions for federal taxes paid, which is not reflected here.
  • • This is for educational purposes only and is not tax advice.

Related Resources

Kentucky Tax Authority

Official Kentucky state tax information, forms, and filing resources.

IRS Federal Income Tax Rates and Brackets

The IRS page showing all seven bracket rates and thresholds for every filing status. This is the primary official source for federal income tax rate information.

IRS Revenue Procedure 2025-32

Official IRS inflation adjustments for tax year 2026, including income tax brackets, standard deductions, and other provisions as amended by the One Big Beautiful Bill Act (OBBBA). Published October 9, 2025.

Read the IRS inflation adjustments that set 2025 bracket thresholds

Revenue Procedure 2024-40 is the authoritative IRS document that sets inflation-adjusted tax parameters for 2025, including bracket thresholds, standard deduction amounts, and other key values.

Use IRS Publication 17 as a complete guide to filing your federal income tax

Publication 17 is the IRS's comprehensive guide for individual taxpayers. It covers filing requirements, standard deduction amounts, taxable income calculations, credits, and deductions for tax year 2025.

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