Self-Employment Tax Calculator

Self-Employment Tax by State

Select your state below for a detailed tax breakdown with pre-computed examples at multiple income levels, state-specific deductions, quarterly payment guidance, and more.

How Self-Employment Tax Works

If you work for yourself as a freelancer, independent contractor, sole proprietor, or single-member LLC, you are responsible for paying self-employment (SE) tax in addition to regular income tax. Unlike traditional employees who split payroll taxes with their employer, self-employed individuals pay both the employer and employee portions.

The self-employment tax rate for 2025 is 15.3% of your net self-employment earnings. This rate is composed of two parts: 12.4% for Social Security (officially known as Old-Age, Survivors, and Disability Insurance, or OASDI) and 2.9% for Medicare (Hospital Insurance). Together, these fund the same programs that traditional W-2 employees contribute to through payroll withholding, but at double the rate since there is no employer to cover half.

Before computing your SE tax, the IRS requires you to multiply your gross self-employment income by 92.35% (0.9235). This multiplier effectively gives you the employer-equivalent deduction up front, reducing your taxable SE earnings. For example, if you earned $100,000 in net self-employment income, your net SE earnings would be $92,350. The Social Security portion applies only up to the wage base limit of $176,100 for 2025. Any earnings above that threshold are exempt from Social Security tax but still subject to Medicare tax. High earners face an additional 0.9% Medicare surtax on earnings that exceed $200,000 for single filers or $250,000 for married couples filing jointly.

One important benefit for the self-employed is the 50% SE tax deduction. You may deduct half of your total self-employment tax when calculating your adjusted gross income (AGI). This deduction is claimed on your Form 1040 and reduces the income that is subject to federal (and in many cases state) income tax. It does not reduce your SE tax itself, but it lowers the income tax you owe on top of it. Understanding this deduction is critical to accurately estimating your total tax burden.

Federal vs State Tax Obligations

Self-employed workers face a dual tax obligation: federal taxes administered by the IRS and state taxes administered by their state's department of revenue. At the federal level, every self-employed individual pays the same SE tax rates regardless of where they live. However, state income taxes vary dramatically from state to state, creating significant differences in the total tax burden depending on your location.

Nine states impose no state income tax at all: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming. If you are self-employed in one of these states, your only obligation is the federal SE tax plus federal income tax. This can result in thousands of dollars in savings compared to high-tax states. On the other end of the spectrum, states like California, New York, New Jersey, and Oregon have top marginal rates exceeding 9%, substantially increasing the total tax bill for high-earning self-employed individuals.

Many states also have their own standard deductions, personal exemptions, and bracket structures that differ from federal rules. Some states use a flat tax rate (such as Colorado, Illinois, and Indiana), while others have progressive brackets similar to the federal system. A few states offer special deductions or credits specifically for self-employed workers, making it essential to understand your state's specific rules. Use this calculator to see exactly how your state's tax structure affects your bottom line.

2026 Tax Year Updates

For tax year 2026, the IRS has adjusted several key thresholds due to inflation. The standard deduction increases to $15,000 for single filers and $30,000 for married filing jointly. Federal income tax brackets have been indexed upward, meaning slightly more of your income falls into lower brackets compared to 2025. The Social Security wage base is expected to rise from $176,100 to approximately $180,000 (official number pending IRS announcement).

Additionally, the One Big Beautiful Bill Act (OBBBA) signed in 2025 introduced expanded Section 179 deductions and modifications to business expense rules that may benefit self-employed individuals. If you purchase equipment, vehicles, or software for your business, review the updated deduction limits using our Section 179 Calculator.

Quarterly Estimated Tax Payment Schedule

If you expect to owe $1,000 or more in tax after subtracting withholding and credits, you are generally required to make quarterly estimated payments. Underpayment can result in a penalty calculated by the IRS based on the amount owed and the number of days the payment was late.

How This Calculator Works

This calculator uses current IRS tax tables and state revenue department data to estimate your self-employment tax liability. The calculation follows the standard IRS methodology: gross SE income is multiplied by 92.35% to determine net SE earnings, then Social Security and Medicare taxes are applied at their respective rates. Federal income tax is computed using progressive bracket tables after applying the standard deduction and the 50% SE tax deduction.

State income tax calculations use each state's published tax brackets, standard deductions, and personal exemptions. Data is sourced from official state department of revenue publications and updated at the beginning of each tax year. For the most accurate results, we recommend consulting a licensed CPA or tax professional, especially for complex situations involving multiple income sources, business deductions, or multi-state filing requirements.

Frequently Asked Questions