Self-employed tax starts with tracking income and expenses, then paying quarterly estimates to the IRS

If you work for yourself — whether as a freelancer, contractor, small business owner, or gig worker — you owe federal income tax plus self-employment tax, which covers Social Security and Medicare. Unlike employees, nobody withholds these from your paychecks. You calculate what you owe, pay it in four installments during the year, and file a full tax return in April. The math is straightforward once you know which forms to use and what counts as income or a deductible expense.

The IRS expects you to pay quarterly estimated taxes if you think you will owe $1,000 or more when you file. Missing these payments can result in penalties even if you pay the full amount in April. Most self-employed people use Schedule C (the profit or loss form for a sole proprietor) and Schedule SE (the self-employment tax form) when they file their annual return.

Key Takeaways

  • Self-employment tax is 15.3 percent of your net profit and covers Social Security and Medicare; you pay both the employer and employee share because you are both.
  • You must pay quarterly estimated taxes in April, June, September, and January if you expect to owe $1,000 or more for the year.
  • Income includes all money from your business, but you subtract legitimate business expenses (supplies, equipment, home office, vehicle mileage) to find your taxable profit.
  • You file Schedule C to report profit or loss, Schedule SE to calculate self-employment tax, and Form 1040 as your main return.
  • Keeping records of income and expenses throughout the year makes tax time much faster and reduces the chance of mistakes or audit problems.

What counts as self-employment income

Self-employment income is any money you receive for work you do for yourself. This includes payments from clients, customers, or platforms; cash tips; barter (trading services for goods); and any other compensation for your labor or business. You report the gross amount before any expenses.

If a client pays you by check, bank transfer, or cash, it all counts. If you receive a 1099-NEC or 1099-MISC form from a client, that is a record of what they reported to the IRS — but you still report all income even if you do not receive a 1099. The IRS expects you to track it yourself. If you work through a gig platform (delivery, rideshare, freelance marketplace), the platform may send you a 1099, but again, you report all earnings regardless.

How to calculate your taxable profit

Taxable profit is your income minus your business expenses. You only pay income tax and self-employment tax on the profit, not on the full amount you earned. This is why tracking expenses matters: every legitimate deduction lowers your tax bill.

Common deductible expenses include supplies and materials, equipment and tools, vehicle mileage (using the standard mileage rate set by the IRS each year, or actual expenses if you track them), home office space (either a percentage of rent or mortgage interest, utilities, and insurance, or a simplified $5-per-square-foot rate up to 300 square feet), professional services (accounting, legal, bookkeeping), software and subscriptions, insurance (liability, health, disability), and education related to your business. You cannot deduct personal expenses, commuting to a regular workplace, or expenses that are not directly tied to earning income.

Keep receipts, invoices, and records for at least three years. The IRS can audit returns from the past three years, and having documentation protects you if questions arise.

Understanding self-employment tax

Self-employment tax is the Social Security and Medicare tax you pay as a self-employed person. Employees have this withheld from their paychecks, split between them and their employer. As a self-employed person, you pay both halves: 12.4 percent for Social Security (on income up to a cap that changes yearly) and 2.9 percent for Medicare (on all net profit), plus an additional 0.9 percent Medicare tax if your income exceeds certain thresholds.

You calculate self-employment tax on Schedule SE using your net profit from Schedule C. The result goes on your Form 1040. You can deduct half of your self-employment tax from your income tax, which slightly reduces your overall tax burden.

For 2024, the Social Security wage base is $168,600, meaning you pay the 12.4 percent rate only on profit up to that amount. Medicare tax applies to all profit. These numbers change each year, so check the IRS website or your tax software for the current year's figures.

Quarterly estimated tax payments and deadlines

If you expect to owe $1,000 or more in federal income tax and self-employment tax combined, you must pay quarterly estimated taxes. These are due on specific dates regardless of when you file your annual return:

  • Q1 (January 1 – March 31): Due April 15
  • Q2 (April 1 – May 31): Due June 15
  • Q3 (June 1 – August 31): Due September 15
  • Q4 (September 1 – December 31): Due January 15 of the following year

You pay using Form 1040-ES, which includes a worksheet to estimate your income and tax for the year. You can pay online through the IRS website (IRS Direct Pay), by phone, by mail, or through an electronic federal tax payment system (EFTPS). Missing a quarterly payment can result in penalties and interest, even if you pay everything when you file your annual return in April.

If your income varies significantly month to month, you can adjust your quarterly payments. Some people pay more in quarters when they earn more and less in slower quarters. You can also make a lump-sum payment in January if that works better for your cash flow, as long as it covers all four quarters.

Forms you need and how to file

Most self-employed people file using three main forms:

  • Schedule C (Form 1040, Schedule C): Reports your business income and expenses, and calculates your profit or loss.
  • Schedule SE (Form 1040, Schedule SE): Calculates your self-employment tax based on the profit from Schedule C.
  • Form 1040: Your main individual income tax return, which combines income from all sources and includes the self-employment tax you calculated on Schedule SE.

You file all three together when you submit your annual return to the IRS. If you have employees, a formal business structure (LLC, S-corp, partnership), or more complex income, you may need additional forms. Tax software designed for self-employed people (such as TurboTax Self-Employed, TaxAct, or H&R Block) walks you through these forms and calculates everything automatically once you enter your numbers.

The annual filing deadline is April 15, though you can request an automatic six-month extension by filing Form 4868. An extension gives you until October 15 to file, but it does not extend the deadline for paying taxes — you still owe payment by April 15 or face penalties and interest.

Record-keeping and documentation

The IRS does not require a specific format for records, but you must keep documentation that supports every number on your return. This means receipts for expenses, invoices or bank statements showing income, mileage logs if you claim vehicle expenses, and records of quarterly tax payments.

Many self-employed people use accounting software (QuickBooks, FreshBooks, Wave) or a simple spreadsheet to track income and expenses throughout the year. This makes it much faster to fill out Schedule C in March or April, and it gives you a clear picture of your business performance month by month. If you are audited, having organized records makes the process faster and protects you from disallowed deductions.

Keep records for at least three years. The IRS can go back further if they suspect fraud, but three years covers the standard audit window.

Frequently Asked Questions

Do I have to pay quarterly taxes if my income is low?

Only if you expect to owe $1,000 or more in total federal income tax and self-employment tax for the year. If your profit is small, you may only owe when you file in April. Use the Form 1040-ES worksheet to estimate your total tax for the year and see whether you cross the $1,000 threshold.

Can I deduct my home office if I work from home?

Yes. You can use the simplified method ($5 per square foot, up to 300 square feet) or calculate actual expenses (a percentage of rent, mortgage interest, utilities, insurance, and repairs based on the office's share of your home). You must use the space regularly and exclusively for business. A corner of your bedroom does not may have access to, but a dedicated room or separate space does.

What if I have a loss instead of a profit?

Report it on Schedule C. A business loss can offset other income (like a spouse's W-2 wages) and reduce your overall tax bill. You can carry losses forward to future years if they exceed your other income. Keep all documentation to support the loss in case of audit.

Do I need to register my business or get a business license to file self-employment taxes?

Not for federal tax purposes. You can file Schedule C as a sole proprietor using your Social Security number without registering anything. However, your state or local government may require a business license or registration, and you may need an Employer Identification Number (EIN) if you hire employees or form an LLC or corporation. Check your state and local requirements separately.

What happens if I miss a quarterly payment?

The IRS charges penalties and interest on the unpaid amount. The penalty is usually around 0.5 percent per month. You can still pay the missed quarter at any time, and the penalty stops accruing once you pay. If you have a pattern of missed payments, the IRS may contact you. It is better to pay late than not at all, but paying on time avoids the penalty entirely.