Kentucky Income Tax Brackets (2026)

Kentucky levies a flat income tax of 3.5% on all taxable income. Unlike graduated-tax states where rates escalate with income, every dollar you earn in Kentucky is taxed at the same 3.5% rate. This simplicity means your effective state tax rate is essentially the same whether you earn $50,000 or $500,000.

Kentucky moved to a 3.5% flat tax in 2024, down from a 5% flat rate. The state has signaled it may continue reducing the rate toward zero if revenue targets are met.

The practical advantage of a flat tax is predictability: if your income doubles, your state tax exactly doubles. In a graduated state like California (1\u201313.3%), a doubling of income could more than double your state tax as more of it falls into higher brackets.

Your total income tax is the sum of federal and Kentucky state taxes. At each income level, an additional dollar is taxed at your federal marginal rate plus the state marginal rate. This combined marginal rate tells you how much of each additional dollar goes to taxes.

At $200K income, your combined marginal rate in Kentucky is 27.5% — meaning each additional dollar is split roughly 28¢ to taxes and 73¢ to you. Even at $50K, the combined marginal rate is already 15.5%. This is why tax-advantaged strategies become increasingly valuable at higher incomes.

While you can’t change the bracket structure, several strategies can reduce the income that’s subject to Kentucky’s 3.5% flat rate:

401(k) / 403(b) contributions: In 2026, you can contribute up to $23,500 pre-tax ($31,000 if age 50+). This reduces both federal and Kentucky taxable income. At Kentucky’s 3.5% rate, maxing your 401(k) saves roughly $823 in state taxes alone.

HSA contributions: If you have a high-deductible health plan, contribute up to $4,300 (individual) or $8,550 (family) to an HSA. These contributions are exempt from both federal and state income tax in Kentucky.

Itemizing deductions: If your state and local taxes (SALT), mortgage interest, and charitable contributions exceed the standard deduction, itemizing can reduce your federal tax. Since Kentucky has local income taxes, your SALT deduction may be significant — but the federal SALT cap of $10,000 limits the benefit.

Traditional IRA: If you’re not covered by an employer plan (or your income is below the phase-out), a traditional IRA contribution of up to $7,000 ($8,000 if 50+) reduces both federal and state taxable income.

How does Kentucky’s flat 3.5% tax compare to nearby states? Here’s a side-by-side at $100K income:

Every state ranked by state income tax burden at $100K income. Kentucky is highlighted at position #23.