How much is self-employment tax in Kentucky?

The federal self-employment tax is 15.3% (12.4% Social Security plus 2.9% Medicare) on 92.35% of your net earnings. On top of that, Kentucky charges its flat 4.0% state income tax on your net self-employment income. There is no separate Kentucky SE tax.

What is the 92.35% multiplier for?

Self-employment tax is calculated on 92.35% of net earnings, not 100%. This 7.65% reduction approximates the employer-side payroll tax that an employee would not pay on their own wages, keeping the self-employed roughly on par with employees.

Is there a Social Security wage cap?

Yes. The 12.4% Social Security portion applies only up to the annual wage base, which is $168,600 for 2024. Earnings above that are subject only to the 2.9% Medicare portion, which has no cap. High earners may also owe the 0.9% Additional Medicare Tax (not included here).

Can I deduct half of my self-employment tax?

Yes. You can deduct one-half of your federal self-employment tax as an above-the-line adjustment to income. This calculator subtracts that half-SE deduction before applying Kentucky's 4.0% state income tax, which lowers the state portion.

Does Kentucky have a separate self-employment tax?

No. Kentucky does not levy a stand-alone self-employment tax. Your self-employment income is simply taxed at Kentucky's flat 4.0% individual income-tax rate, the same as wage income. Some Kentucky cities and counties add a local occupational tax that is separate.

Kentucky Self-Employment Tax Calculator

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Self-employed Kentuckians owe two layers of tax: the 15.3 percent federal self-employment tax that funds Social Security and Medicare, and Kentucky’s flat 4.0 percent state income tax. This calculator computes both and applies the deductible half-SE-tax adjustment before the state portion.

How it works

Federal self-employment tax is calculated on 92.35 percent of your net earnings, not the full amount. That base is taxed at 12.4 percent for Social Security up to the annual wage base (168,600 dollars for 2024) and 2.9 percent for Medicare with no cap:

se base   = net earnings × 0.9235
ss tax    = min(se base, 168,600) × 0.124
medicare  = se base × 0.029
SE tax    = ss tax + medicare
half SE   = SE tax ÷ 2          (deductible adjustment)
KY tax    = (net earnings − half SE) × 0.04
total     = SE tax + KY tax

You can deduct one-half of the SE tax against your income, which lowers the Kentucky state portion. Kentucky has no separate self-employment tax — your net profit is simply taxed at the flat 4.0 percent rate.

Example

On 80,000 dollars of net self-employment income, the SE base is 80,000 × 0.9235 = 73,880 dollars. SE tax is 73,880 × 0.153 = about 11,304 dollars (Social Security is well under the cap). Half of that, 5,652 dollars, is deductible, so Kentucky tax is (80,000 − 5,652) × 0.04 = about 2,974 dollars. The combined estimate is roughly 14,278 dollars.

Notes

Estimate only, not tax advice. This tool models the standard 15.3 percent SE tax, the 2024 Social Security wage base, and Kentucky’s flat 4.0 percent income tax after the half-SE deduction. It does not include the 0.9 percent Additional Medicare Tax on high earners, the QBI deduction, the Kentucky standard deduction, or local occupational taxes. Confirm with IRS Schedule SE and Kentucky Form 740 at revenue.ky.gov.