How this calculator works
Like our other paycheck calculators, this estimates federal tax and FICA the same way regardless of state. On top of that, it applies Kentucky’s flat 3.5% state income tax to your federal-taxable wages after subtracting Kentucky’s own standard deduction, currently $3,360 for 2026. Unlike the federal standard deduction, Kentucky’s figure is the same dollar amount whether you file single or jointly.
Kentucky is one of the simplest income-tax states in this cluster to calculate: no brackets, no separate payroll tax beyond income tax, and no personal exemption to track (Kentucky repealed its old personal exemption credit in 2018). The one thing this calculator deliberately leaves out is Kentucky’s extensive local occupational license taxes, covered in the FAQ below: nearly 300 cities, counties, and school districts each charge their own percentage-based tax on wages, with no single statewide rate to apply here.
The formula
(federal tax, FICA, and net-pay assembly are identical to the Colorado calculator)
kyTaxableIncome = max(0, wagesAfterPretax − $3,360)
(Kentucky's own standard deduction, the SAME for single and joint filers)
kyIncomeTax = kyTaxableIncome x 3.5%
stateTax = kyIncomeTax
Worked example
A single filer earning $60,000/year, paid biweekly, with no 401(k) or extra deductions:
- FICA: $4,590.00/year (6.2% + 1.45% of $60,000, same as any state)
- Federal tax: $5,020.00/year ($60,000 minus $16,100 federal standard deduction = $43,900 taxable, same as any state)
- Kentucky income tax: $60,000 minus $3,360 Kentucky standard deduction = $56,640 taxable x 3.5% = $1,982.40/year
- Net pay: $60,000 minus $4,590.00 minus $5,020.00 minus $1,982.40 = $48,407.60/year, or $1,861.83 per biweekly paycheck
The Kentucky Department of Revenue’s own 2026 withholding formula document publishes two worked examples we reproduce exactly as this calculator’s primary sourced test vectors: a $3,270/month salary, where annual wages of $39,240 minus the $3,360 standard deduction equals $35,880 taxable, and $35,880 x 3.5% equals $1,255.80 in annual Kentucky tax; and a $1,500 biweekly wage, where annual wages of $39,000 minus $3,360 equals $35,640 taxable, and $35,640 x 3.5% equals $1,247.40 in annual Kentucky tax. We checked SmartAsset’s Kentucky Paycheck Calculator too, but as of our 2026-08-25 access date it still showed the prior year’s 4% rate, so we relied on the Department of Revenue’s own document instead of a stale secondary source.
Frequently asked questions (FAQ)
What is Kentucky's 2026 state income tax rate?
A flat 3.5% on Kentucky taxable income, the same rate for every filer regardless of income or filing status. This is down from 4.0% in 2024 and 2025, and 4.5% in 2023, part of a series of annual cuts under House Bill 1, signed in February 2025 and effective for tax years beginning on or after January 1, 2026.
Does Kentucky have its own standard deduction, and is it different for married couples?
Yes. Kentucky has its own standard deduction, adjusted for inflation each year: $3,360 for 2026, unrelated to the much larger federal figure. Unlike the federal standard deduction, it does not double for married couples filing jointly. Kentucky joint filers claim the same single $3,360 deduction a single filer would.
Why did my Kentucky withholding go down this year?
Kentucky's flat income tax rate dropped from 4.0% to 3.5% starting January 1, 2026, under House Bill 1. Kentucky has cut this rate almost every year this decade (5% in 2022, 4.5% in 2023, 4.0% in 2024 and 2025), so a smaller Kentucky withholding line on a similar paycheck is expected, not an error.
Does Louisville, Lexington, or my city or county charge its own local income tax?
Very likely, yes. Kentucky is unusual in that just under 300 of its cities, counties, and school districts levy their own occupational license tax on wages, typically 1% to 3%, and they can stack. Louisville's combined rate is around 2.2%, and Lexington's is around 2.25%. This calculator does not include local tax, since there is no single statewide rate to apply.
Does Kentucky have a state disability insurance or paid family leave payroll tax?
No. Kentucky authorized employers to offer paid family and medical leave through private insurers starting in 2024, but participation is entirely optional and there is no state-run program or mandatory payroll deduction, unlike California, Colorado, New Jersey, New York, or Washington.
Does contributing to a 401(k) lower my Kentucky state tax the way it lowers my federal tax?
Yes. Kentucky adjusted gross income starts from federal adjusted gross income, which is already reduced by 401(k) elective deferrals, so contributing to a 401(k) lowers your Kentucky taxable wages the same way it lowers your federal taxable wages, before Kentucky's own standard deduction is applied.
Why is my actual Kentucky paycheck different from this calculator's estimate?
This calculator spreads your estimated annual tax liability evenly across paychecks, while employers use IRS and Kentucky withholding tables that don't produce identical per-paycheck amounts. It also excludes any local occupational license tax your city or county charges, which most Kentucky workers owe on top of this estimate.