How to Use This Calculator
Enter your income, filing status, and any deductions. The calculator computes your Kentucky state income tax alongside your federal tax, showing exactly how much goes to each and what you take home.
The most useful thing to try? See how Kentucky's flat 4.0% rate affects different income levels, then test how deductions and retirement contributions change your bottom line.
Here's what each field means:
Annual Income is your total earnings before any taxes. Include wages, freelance income, investment income, and any other sources.
Filing Status determines which deductions and exemptions apply. Kentucky uses filing statuses similar to the federal system.
Kentucky Income Tax: What You Need to Know
Kentucky uses a flat income tax of 4.0% on all taxable income. Unlike states with progressive brackets, everyone pays the same percentage regardless of how much they earn. A teacher making $45,000 and a CEO making $500,000 both pay 4.0%.
Kentucky switched from a six-bracket graduated system (2% to 6%) to a flat 4.0% rate in 2024. The rate is scheduled to continue declining — if state revenue targets are met, the rate will drop by 0.5% increments down to potentially 0%. Kentucky starts with federal AGI and applies its own standard deduction. The state does not tax Social Security benefits and offers a pension exclusion of up to $31,110.
A Real Example
Let's say you're a single filer earning $55,000 in Kentucky. After applying the standard deduction of $3,160, your approximate Kentucky state income tax would be around $2,074, for an effective state tax rate of about 3.8%.
That's just the state portion. Federal income tax and FICA taxes are additional.
Deductions and Exemptions
Standard Deduction: $3,160 for single filers and $6,320 for married couples filing jointly.
Kentucky standard deduction, personal tax credit of $40, and pension/retirement income exclusion of up to $31,110.
Local Taxes
Yes — many Kentucky cities and counties impose local occupational or income taxes, typically ranging from 1% to 2.5%. Louisville Metro, for example, charges a 2.2% occupational tax, and Lexington charges 2.5%. These can add significantly to your total tax bill.
Recent Changes
The flat 4.0% rate took effect in 2024, down from the graduated system. If revenue triggers are met, the rate may continue to decline.
How to Use This Calculator Strategically
Model a raise or job change. With a flat tax, the math is simpler — every additional dollar is taxed at 4.0%. But deductions and credits can still shift your effective rate.
Compare filing statuses. Even with a flat rate, different filing statuses unlock different deduction amounts that can affect your bottom line.
Plan retirement contributions. See how 401(k) or IRA contributions reduce your Kentucky taxable income and lower your state tax bill.
Evaluate a move. Compare Kentucky's flat 4.0% rate to other states. Depending on your income level, a flat tax state might save you money — or cost you more — compared to a progressive system.
References
- Kentucky Department of Revenue. (2025). Individual Income Tax.
This calculator is for educational purposes only and does not constitute tax or financial advice. Tax rates and rules change regularly. Consult a qualified tax professional for guidance specific to your situation.