Self-Employment Tax Basics for Side Hustlers

If your side hustle makes a profit, self-employment tax may apply. In general, the IRS says you must file Schedule SE when net earnings from self-employment are at least $400. The tax funds Social Security and Medicare; it is separate from whether a client sends you a Form 1099. Keep records from the first payment, because tax planning depends on what you earned, not whether a form arrives in the mail.

What self-employment tax covers

When you work for yourself, no employer withholds Social Security and Medicare taxes from your wages. The IRS describes self-employment tax as those two taxes for people who work for themselves. Its stated rate is 15.3%: 12.4% for Social Security and 2.9% for Medicare. The Social Security portion has an annual wage base, and Additional Medicare Tax can apply above the relevant income threshold. Wages from another job can also affect the Social Security portion, so the flat rate does not describe every person's full tax situation.

For most self-employed people, net earnings for this calculation are generally 92.35% of net profit, as the IRS states in Topic no. 554 and on Schedule SE. The 15.3% rate applies to that adjusted amount, subject to the Social Security wage base and other rules. On a $1,000 net profit, that means $923.50 is generally subject to the rate, or about $141.30 in self-employment tax before any applicable limits or other adjustments. This is an estimate, not a complete tax calculation. Source: IRS, Topic no. 554, Self-Employment Tax, retrieved October 29, 2026.

Self-employment tax is only part of the bill. Federal income tax may also apply, and the IRS pages used here did not cover state or local requirements. Business expenses and other tax details matter too. Use the rate and calculation as a starting point for planning, not as a substitute for the applicable IRS forms and instructions.

Sources: IRS self-employment tax overview, Topic no. 554, and estimated taxes, checked November 5, 2026. This is a US federal overview, not a 2027 filing-year calculation; use the forms and instructions for the tax year you are reporting.

Schedule C and Schedule SE do different jobs

For a sole proprietor or independent contractor, Schedule C generally uses business income and expenses to calculate net profit. Schedule SE then calculates self-employment tax from net earnings. A client paying you $500 does not automatically mean your net earnings are $500: keep complete records of income and allowable business costs, then follow the applicable IRS forms and instructions.

Keep a separate record of every payment, platform fee, supply purchase, mileage record if relevant, and refund. Save receipts and note what each cost was for while you remember. A consistent spreadsheet and a folder for receipts are more useful than reconstructing a year of small transactions in April.

If you earn money from an online shop, keep sales and fee records alongside inventory costs. Our guide to starting an Etsy shop and understanding its fees covers the platform charges sellers should record. If occasional gigs are turning into repeat business, revisit your budget before treating every deposit as spendable income.

When quarterly estimated taxes enter the picture

The IRS says individuals generally need estimated tax payments if they expect to owe at least $1,000 when they file. Estimated payments are divided into four periods, each with its own due date. Check the IRS payment calendar for the applicable tax year rather than relying on an old reminder or a date copied from another year.

The IRS describes a general underpayment safe harbor as paying at least 90% of the current year's tax or 100% of the prior year's tax, whichever is smaller. Special rules apply to higher-income taxpayers, farmers, and fishermen. Payment timing still matters: reaching an annual total does not automatically cure late installments. This is a planning benchmark, not a universal guarantee against penalties; income patterns and personal circumstances can change which rule applies. If freelance income swings from month to month, review your running totals and current IRS instructions instead of assuming four equal installments will match your earnings.

Transfer a portion of each payment into a separate savings bucket, then compare year-to-date income and expenses with your tax estimate regularly. The right reserve depends on your whole tax picture, so do not copy another seller's or freelancer's percentage as if it were your own calculation.

A Form 1099 is paperwork, not the definition of income

Do not wait for a Form 1099 before keeping records or considering whether income is reportable. The IRS Gig Economy Tax Center says gig income must be reported even when it is not reported on an information return such as a Form 1099. A payment platform's form-reporting rules and your responsibility to report taxable income are separate questions. Reconcile your records against any forms you receive, and check official IRS filing guidance if the totals do not match.

This matters for small freelance projects, tips, and sales across multiple platforms. A missing form does not mean the activity has no tax consequences. The IRS pages reviewed cover federal tax only; state, local, registration, and business-license requirements were not verified for this article.

Three questions side hustlers ask

Do I owe self-employment tax if I made less than $400?

The IRS page generally identifies $400 in net self-employment earnings as the Schedule SE filing threshold and notes a separate rule for church-employee income. That does not mean earnings below $400 never matter for any other tax purpose. Check the IRS rules for your complete return and situation.

Do I have to pay quarterly estimated taxes?

Estimated payments may generally be required if you expect to owe at least $1,000 when filing. The IRS has safe-harbor rules and special cases, so use the current estimated-tax instructions to determine what applies rather than relying on a generic quarterly calculator.

Is self-employment tax the same as income tax?

No. The IRS describes self-employment tax as Social Security and Medicare taxes. Income tax is a separate part of your federal tax picture. Keep both in mind when deciding what portion of a side-hustle payment is available to spend.

Once your tax reserve is set aside, you can explore how compound interest works over time and how to start investing with small amounts, after considering your cash needs and tax obligations.