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Self-employment tax explained simply, from rates to payments

Here is self-employment tax explained simply. Learn 2025 rates, deductions, quarterly estimated payments, and how to calculate what you owe as a freelancer.

Your tax bill follows net business income, not every dollar your business brings in. Here’s self-employment tax explained simply: people who work for themselves, including sole proprietors, independent contractors, partnership members, and gig workers, generally pay Social Security and Medicare taxes on their net earnings. For the 2025 tax year, the self-employment tax rate is 15.3% of applicable earnings, calculated on 92.35% of net earnings.

Self-employment tax is easy to confuse with income tax, but they are separate obligations. Both may be part of your federal tax bill. Because no employer withholds tax from your business income, you may also need to make estimated payments during the year.

This guide explains who counts as self-employed, how business expenses affect the net earnings used in the calculation, and how Social Security and Medicare fit together. You’ll also learn how self-employment tax differs from income tax and when estimated payments come into play, making the process easier to understand and plan for.

Key Takeaways

Self-employment status can apply to sole proprietors, independent contractors, partnership members, and people earning money through gig work.
Business expenses affect net income, which is the starting point for calculating self-employment tax.
Social Security and Medicare make up self-employment tax, but their rules differ, including how the Social Security wage base applies.
Estimated payments help cover income tax and self-employment tax during the year; Form 1040-ES helps calculate them.
Timebook’s free time tracking can help freelancers keep a record of time spent on their work.

Who is self-employed?

In the United States, self-employed individuals work for themselves rather than as employees. This includes sole proprietors, independent contractors, partners carrying on a trade or business, and gig workers, even when the work is part time. The working arrangement matters, not whether the work provides a full-time livelihood.

Employees and self-employed people fund Social Security and Medicare differently. Employees and employers each pay 7.65% in FICA taxes; a self-employed person generally pays both portions through self-employment tax, which is 15.3% for the 2025 tax year. The employer portion of FICA, 7.65%, may be deducted from gross income to reduce income tax. This deduction does not erase the self-employment tax itself.

Net business income matters because deductible business expenses reduce the profit used in the self-employment tax calculation. A sole proprietor generally reports business income or loss on Schedule C (Form 1040). Computers, software, and other tools necessary for the business can be deductible expenses. Business-trip mileage and travel for client meetings, along with website hosting and social media advertising, may also qualify. Keep records that connect each expense to the business.

A home office deduction may apply when part of your home is used exclusively for business. This exclusive-use test matters: a desk used for both personal and business activities does not meet the condition. Track health insurance premiums separately from ordinary operating expenses. Keeping records distinct makes it easier to assess applicable deductions when preparing your income-tax return.

Self-employed individuals may also deduct half of their self-employment tax when figuring adjusted income for income-tax purposes. This is an income-tax deduction, not a reduction to the Social Security and Medicare tax owed. Keep the calculation separate from business expenses and the deduction for the employer portion, even though both can affect income-tax calculations.

The qualified business income deduction is another separate income-tax consideration. Some self-employed individuals may deduct up to 20% of qualified business income, plus qualifying REIT dividends and publicly traded partnership income. It does not replace the self-employment tax calculation. For tax years beginning after December 31, 2006, a qualified joint venture whose only members are a married couple filing jointly can elect not to be treated as a partnership for federal tax purposes. That classification can affect how the couple reports business income.

Quarterly estimated tax payments

Estimated payments let self-employed individuals pay federal income tax and Social Security and Medicare taxes throughout the year. Since no employer withholds tax from business income, plan for these payments as you earn.

Making Estimated Tax Payments

Estimated quarterly tax payments are installments toward the federal taxes you expect to owe for the year. They matter because business income usually arrives without payroll withholding, so waiting until you file may leave a large balance due.

According to the Internal Revenue Service, self-employed individuals use Form 1040-ES to figure estimated taxes. It includes worksheets for estimating tax and calculating payment amounts. The Internal Revenue Service says individuals who expect to owe $1,000 or more when filing their tax return must make estimated tax payments.

The usual quarterly due dates are April 15, June 15, and September 15, followed by January 15 for the fourth quarter of the prior year. These dates divide the tax year into payment periods, not equal calendar quarters. For example, the first payment covers income from the year’s opening months, while the January installment covers the closing period.

Use the Form 1040-ES worksheets to estimate both income tax and self-employment tax. Start with expected business income, account for expenses, then revise the estimate when earnings change. A strong early year followed by slower work can shift the amount due. Recalculate as income and expenses develop instead of treating the first estimate as fixed.

Safe-harbor targets offer another way to plan payments. Paying at least 90% of current-year tax liability or 100% of prior-year tax liability can help avoid underpayment penalties. These targets compare payments with tax liability, not gross receipts. Owners with uneven income should track earnings and payments throughout the year to see whether their estimates remain aligned.

Consequences of Underpaying Self-Employment Tax

Paying too little during the year can leave a balance due and may result in an underpayment penalty. Both the amount and timing of payments matter, so the annual return alone won’t show whether each installment was sufficient.

For example, an owner who pays below the 90% current-year or 100% prior-year safe-harbor amount may face a penalty. A large final payment doesn’t necessarily erase an earlier shortfall, because estimated tax is assessed across payment periods. Keep payment confirmations and income records together, then compare each installment with the Form 1040-ES estimate.

If business income changes, update the next estimate rather than carrying forward an outdated figure. Record payment dates, amounts, and the income period each installment covers. The April 15, June 15, September 15, and January 15 schedule gives owners clear points for reviewing those records and adjusting upcoming payments.

Social Security and Medicare tax rates

Self-employment tax combines Social Security and Medicare contributions. Each portion has different rules, so the calculation can change as earnings rise.

Social Security and Medicare Tax Portions

Self-employment tax has a Social Security portion and a Medicare portion, each calculated using its own rate and limits. According to the Internal Revenue Service, the Social Security portion is 12.4%, up to the annual wage base limit. According to the Internal Revenue Service, the Medicare portion is 2.9%.

The Social Security wage base limit for 2026 is $184,500. Earnings above that limit are not subject to the Social Security portion of self-employment tax. The Medicare portion has no income limit, so it continues to apply as net earnings increase. This difference matters for individuals whose business earnings approach or exceed the wage base.

Tax Rates and Schedule SE

Schedule SE is the form self-employed individuals use to report Social Security and Medicare taxes with their federal return. According to the Internal Revenue Service, self-employed individuals file Schedule SE (Form 1040 or 1040-SR) to report these taxes.

For a straightforward estimate, add the standard portions: 12.4% for Social Security and 2.9% for Medicare. Together, they make the 15.3% self-employment tax rate on applicable earnings. The calculation still accounts for the Social Security wage base limit, so applying 15.3% to every dollar can overstate the tax when earnings pass that limit.

Schedule SE connects your earnings calculation to the tax reported on your return. Organize business income and expense records before completing it. Net earnings, not gross receipts alone, are the starting point, and the Social Security limit affects only that portion of the tax.

Additional Medicare Tax Thresholds

An additional Medicare tax of 0.9% may apply when income exceeds a filing-status threshold. The threshold is $200,000 for single filers, $250,000 for married taxpayers filing jointly, and $125,000 for married taxpayers filing separately.

This additional Medicare tax is separate from the standard 2.9% Medicare portion. For example, a single filer whose applicable earnings exceed $200,000 may need to account for the extra 0.9% on earnings above the threshold. A married couple filing jointly uses the $250,000 threshold instead, while married taxpayers filing separately use $125,000.

Filing status affects when the additional tax applies. Review it alongside net earnings and the standard Medicare calculation when preparing your return. Keep the additional tax separate from the Social Security portion, which has its own annual wage base limit and rate.

Self-employment tax and income tax obligations

Self-employment tax and federal income tax are separate obligations, even when both apply to the same business earnings. Self-employment tax funds Social Security and Medicare. Income tax is calculated separately, using taxable income, filing status, deductions, and other relevant details. Sole proprietors should track both liabilities rather than treating one payment as covering the other.

According to the Internal Revenue Service, a self-employed individual must file an income tax return if annual net earnings from self-employment were $400 or more. That filing requirement concerns net earnings, not simply total revenue received. For example, a sole proprietor starts with business revenue and accounts for allowable expenses to determine net earnings.

Not every receipt automatically counts as business earnings. Revenue from providing services or selling through an active business differs from passive income, such as investment returns. The source and nature of each receipt help determine whether it belongs in the self-employment tax calculation. Keep records that distinguish business activity from other income before preparing tax forms.

How passive income is treated depends on what generated it and your role. Interest, dividends, and investment gains differ from payment for a client project. A freelancer’s fee for completed work, by contrast, comes from active business services. Classify income by source to avoid applying the self-employment tax calculation to unrelated receipts.

Church income has a specific threshold. An exemption may apply to individuals who report less than $108.28 per year in church income. This narrow rule concerns church income, not every type of self-employment revenue. Separate church-related records from business invoices so the income categories remain clear when preparing a return.

State and local taxes are separate from federal tax obligations. They don’t change the federal self-employment tax calculation, but state or local income and business taxes may create additional liabilities. The rules depend on where you live, work, and conduct business. Keep records for each jurisdiction separate from federal forms and payments.

For a sole proprietor, start by sorting records into three categories: business revenue, deductible business expenses, and income from other sources. These help determine net earnings for self-employment tax and taxable income for federal income tax. They also make it easier to identify which figures belong on your federal return and which relate to state or local filings.

Separate calculations make filing less confusing. First, identify the source of each receipt. Then calculate business net earnings after relevant expenses, and consider income-tax deductions and other taxable income separately. This keeps Social Security and Medicare tax distinct from income tax and clarifies your overall federal and local responsibilities.

Self-employment tax calculation using net business income

Start with business profit, not gross revenue. Self-employment tax applies to net earnings after allowable business expenses, so accurate records establish the right starting point. Revenue is money earned; net business income is revenue minus expenses. To understand self-employment tax explained simply, follow the calculation in order.

According to the Internal Revenue Service, self-employed individuals calculate self-employment tax on 92.35% of their net revenue. This adjustment means the full net profit isn’t the amount used as subject earnings for the tax calculation. Apply the adjustment after determining net business income, not directly to gross receipts before expenses.

Consider a service provider with $180,000 in gross revenue and $80,000 in business expenses. Subtract expenses to find $100,000 in net profit. The example shows why expense records matter before estimating taxes for a business owner.

For the 2025 tax year, the self-employment tax rate is 15.3% of applicable earnings. The sequence is straightforward: determine net profit, apply the 92.35% factor, then apply the rate. The final tax may also reflect the Social Security wage base limit discussed earlier.

Use this sequence when reviewing your filing figures:

Gather revenue records, such as invoices and payment statements.
Subtract eligible business expenses to determine net business income.
Apply the 92.35% calculation to net revenue.
Apply the relevant self-employment tax rate, accounting for applicable limits.

Form 1040 and Schedule SE report figures used in the federal filing. Keep this calculation separate from income tax: self-employment tax covers Social Security and Medicare, while income tax uses a separate calculation. The deduction for half of self-employment tax affects income-tax calculations, not the initial self-employment tax amount.

Recalculate when revenue or expenses change. A new client contract can raise income, while documented business costs can lower net profit. Keep dated invoices, receipts, and expense records to support each figure. For clearer work records, track time spent on client work alongside your business records.

To keep self-employment tax explained simply, don’t calculate from gross revenue alone. Net income sets the starting point, the 92.35% adjustment identifies applicable earnings, and the tax rate comes afterward. This order gives sole proprietors a clearer estimate before filing and helps separate business profit from the amount subject to self-employment tax.

Timebook: Free Time Tracking

Timebook’s Free Time Tracking helps freelancers record time spent on work, creating a clearer business record alongside income and expense records. Track time as projects progress, rather than waiting until tax filing approaches.

If you also need invoicing and accounting tools, Timebook Pro adds invoicing and full accounting features. It can help keep core business records together, while tax estimates and filing decisions remain separate tasks.

Choose the setup that fits your work: time tracking for recording hours, or Pro when invoicing and accounting are also part of your routine. To explore Timebook, visit usetimebook.com.

Build a steadier routine for your business finances

Understanding self-employment tax explained simply is a useful starting point. Next, make business recordkeeping part of your regular work instead of leaving it until filing season. A consistent routine helps you see how client work, invoices, and expenses fit together before estimating what you owe.

Timebook’s Free Time Tracking helps you record work hours. Freelancers who also need invoicing and accounting tools can use Timebook Pro, which includes Freelance Invoicing Software. These tools support business recordkeeping, but don’t replace tax calculations or filing decisions.

Choose a routine that fits how you work. Keep project and financial records current, then use them to prepare for your tax tasks. Explore Timebook’s tools and find a practical way to keep your work records organized.

Frequently Asked Questions

How do I make my quarterly payments?

Estimate your federal income and self-employment tax, then use Form 1040-ES to calculate installments. The worksheet helps account for expected income and deductions, so update your estimate if business activity changes. Keep a record of each payment and its date with your tax documents. For example, if a large project increases your earnings, revise your estimate rather than relying on an earlier calculation.

What is self-employment tax and who has to pay it?

Self-employment tax funds Social Security and Medicare for people who work for themselves. It generally applies to sole proprietors, independent contractors, partners carrying on a trade or business, and gig workers. A side business can count even if it isn’t your main job. The income source and working arrangement help determine whether earnings are subject to this tax.

What income is subject to self-employment tax?

Net earnings from an active trade or business are generally subject to self-employment tax. These may include fees for freelance projects, gig work, or business sales, after eligible business expenses. Investment income, such as interest or dividends, is generally different from payment for services. Separate business receipts from personal and investment income so each category is treated correctly in your tax records.

What is the self-employment tax rate in 2026?

The standard combined Social Security and Medicare rate is 15.3% on applicable earnings. The Social Security portion is 12.4%, subject to the wage base limit, while Medicare is 2.9%. For 2026, the Social Security wage base limit is $184,500. An additional 0.9% Medicare tax may apply above the threshold tied to filing status, so higher earners may have an added amount to consider.

How is self-employment tax calculated, including the Social Security wage limit?

Start with net business earnings after allowable expenses, then calculate the applicable self-employment earnings and apply the Social Security and Medicare rates. The Social Security portion applies only up to the wage base limit, while Medicare has no income limit. For 2026, the Social Security wage base is $184,500. Earnings above it can still be subject to Medicare tax, and filing status can affect additional Medicare tax.

Can you deduct half of self-employment tax from your income taxes?

Yes. The deduction for half of your self-employment tax can reduce the income used to calculate federal income tax. It doesn’t reduce the self-employment tax itself or change the Social Security and Medicare amounts reported. Keep this deduction separate from ordinary business expenses. For example, a sole proprietor calculates business profit first, then accounts for the half-tax deduction when calculating income tax.

How do you report self-employment income and calculate the tax on IRS Form 1040 Schedule SE?

Report sole-proprietor business income or loss on Schedule C (Form 1040), then use Schedule SE to calculate Social Security and Medicare taxes. Schedule SE carries the self-employment tax calculation into the federal return. Keep income and expense records available to support the net earnings figure. If you also have employee wages, those records can matter when determining how the Social Security wage base applies.

When are estimated tax payments due for self-employed people?

Estimated payments are generally due April 15, June 15, and September 15, followed by January 15 for the fourth quarter of the prior year. The installments cover different income periods, so the intervals aren’t identical calendar quarters. If a due date falls on a weekend or holiday, the applicable deadline can shift. Check the current Form 1040-ES instructions when planning a particular year’s payment dates.