Kentucky Income Tax Calculator
Kentucky’s flat 4% rate is already one of the simpler state tax systems in the South — and it’s falling to 3.5% next year under House Bill 1. The catch most people miss: Kentucky’s own $3,270 standard deduction doesn’t double for married couples, and local occupational taxes add a layer in cities like Louisville and Lexington. This take-home pay calculator covers all of it.
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How Kentucky Income Tax Actually Works
Kentucky switched from a six-bracket graduated income tax to a flat rate structure back in 2018, when legislators collapsed the old system — which topped out at 5.8% — into a single 5% rate. That shift kicked off a deliberate rate-reduction strategy, and the number has been moving in one direction ever since: 5% through 2022, then 4.5% for 2023 and 2024, and now 4.0% for the 2025 tax year. The most recent cut came through House Bill 1, signed in early 2025, which sets the rate at 3.5% effective January 1, 2026 — meaning anyone earning wages in Kentucky will see a meaningful bump in take-home pay starting with their first paycheck of 2026. The legislature’s stated goal is eventually eliminating the individual income tax entirely, making Kentucky one of the zero-income-tax states.
The mechanic that catches most new Kentucky residents off guard is the standard deduction. Unlike the federal government — where the standard deduction is $15,750 for single filers and $31,500 for married couples filing jointly — Kentucky has its own flat standard deduction of just $3,270, and it applies equally to every filing status. A married couple doesn’t get $6,540; they each get $3,270 on their respective computations, the same as a single filer. And unlike states such as Colorado or South Carolina that start from federal taxable income, Kentucky starts from your federal adjusted gross income, then subtracts only this small $3,270 deduction. The result is that your Kentucky taxable income is often meaningfully higher than what you reported to the IRS, especially if you take the standard deduction federally at the much larger federal amounts.
Why Kentucky is genuinely attractive for retirees: Social Security benefits are completely exempt from Kentucky tax at every income level — no phase-out, no threshold, no age requirement. On top of that, each Kentucky taxpayer can exclude up to $31,110 of qualifying retirement income — including 401(k) distributions, IRA withdrawals, and private pensions — from their Kentucky taxable income. For a married couple where both spouses have retirement income, the combined exclusion is up to $62,220. State and local government retirees (KERS, CERS, TRS) get their pensions entirely exempt, and those with government service prior to January 1, 1998 may qualify for an even larger exclusion under Schedule P. Active-duty military pay is fully exempt at any income level. The local occupational license taxes in cities like Louisville (approximately 2.2%), Lexington (2.25%), and Covington (approximately 2.45%) add a layer on top of state tax — but they’re withheld separately and don’t appear on the Kentucky state return.
Frequently Asked Questions
Kentucky applies a flat 4.0% rate to all taxable income for the 2025 tax year, regardless of income level or filing status. The rate dropped from 4.5% in 2024, and under House Bill 1 signed in early 2025, it is scheduled to fall further to 3.5% effective January 1, 2026.
Kentucky’s standard deduction for 2025 is $3,270 per filer, the same for every filing status including married filing jointly. It does not double for joint filers the way the federal standard deduction does, and at $3,270 it is one of the lowest state standard deductions in the country.
No. Kentucky fully exempts Social Security benefits from state income tax under KRS 141.019, with no income threshold, no phase-out, and no age requirement.
Each Kentucky taxpayer may exclude up to $31,110 of qualifying pension and retirement income from state tax in 2025, including 401(k) distributions, IRA withdrawals, and private pensions. For a married couple where both spouses have qualifying retirement income, the combined exclusion is up to $62,220. Government and railroad retirement pensions may qualify for a larger exclusion using Schedule P.
Kentucky allows cities and counties to levy occupational license taxes on wages earned within city limits. Louisville/Jefferson County charges approximately 2.2%, Lexington-Fayette County charges 2.25%, and Covington charges approximately 2.45%. Most other Kentucky cities charge between 0.5% and 2%. These taxes are collected separately from the state income tax.
No. Active-duty military pay is fully exempt from Kentucky state income tax. Up to $31,110 of military retirement pay may also be excluded using the standard pension income exclusion, and some veterans may qualify for a larger exclusion under Schedule P.
Methodology: Calculations use Kentucky’s 2025 flat 4.0% individual income tax rate applied to Kentucky adjusted gross income minus the $3,270 state standard deduction (per Kentucky Department of Revenue), a $31,110 pension income exclusion per person (up to $62,220 MFJ), local occupational license tax based on the jurisdiction selected, the 2025 IRS federal tax brackets and Child Tax Credit rules, and 2025 Social Security (6.2% to the $176,100 wage base) and Medicare (1.45% + 0.9% additional Medicare tax) rates per IRS.gov. Social Security, active-duty military pay, and qualifying government pensions are fully exempt from Kentucky tax. Kentucky’s rate drops to 3.5% for the 2026 tax year under HB 1. Local occupational tax rates are estimates; verify your exact rate with your city or county. This tool provides estimates for planning purposes only and is not tax, legal, or financial advice. Last reviewed for accuracy: June 2026.