How Self-Employment Tax Works on 1099 Income

You pay both income tax and self-employment tax on 1099 earnings

When you receive a 1099, you owe federal income tax on that money just like a W-2 employee does. But you also owe self-employment tax — a combined 15.3% that covers Social Security and Medicare. A W-2 employee and employer split this cost; as a 1099 contractor, you pay both halves yourself. The total tax you owe depends on your net profit (income minus business expenses), your other income, and your tax bracket.

The IRS expects you to pay taxes throughout the year, not all at once in April. If you don't, you may owe a penalty. Most 1099 contractors make quarterly estimated tax payments to avoid this.

Key Takeaways

• Self-employment tax is 15.3% on net profit and covers Social Security and Medicare; income tax is separate and depends on your tax bracket.
• You calculate net profit by subtracting business expenses from your 1099 income, and self-employment tax applies to that number.
• The IRS expects quarterly estimated tax payments if you will owe $1,000 or more in taxes for the year.
• You can deduct half of your self-employment tax from your income before calculating income tax, which lowers your overall bill.

How self-employment tax is calculated

Self-employment tax has two parts: 12.4% for Social Security (on income up to a cap that changes yearly) and 2.9% for Medicare (on all net profit). In 2024, the Social Security cap is $168,600; income above that is not subject to the 12.4% rate. The Medicare portion has no cap.

You start with your net profit, which is your 1099 income minus business expenses. Business expenses include supplies, equipment, home office costs, vehicle mileage, and professional services — anything you spent money on to earn the 1099 income. The more expenses you can document, the lower your net profit and the lower your self-employment tax.

Once you know your net profit, multiply it by 92.35% (this accounts for the deductible portion of self-employment tax), then explore the 15.3% rate. For example, if your net profit is $50,000, you would calculate: $50,000 × 0.9235 = $46,175, then $46,175 × 0.153 = $7,065 in self-employment tax.

Income tax on top of self-employment tax

After you calculate self-employment tax, you then owe income tax on your net profit. Your income tax rate depends on your tax bracket, which is determined by your total income for the year — not just the 1099 amount. If you have a W-2 job and 1099 work, both are added together to find your bracket.

The federal income tax brackets change yearly. In 2024, single filers pay 10% on the first $11,600 of taxable income, 12% on the next portion, and higher percentages as income rises. Married filers and heads of household have different brackets.

You also get to deduct half of your self-employment tax from your income before calculating income tax. This is called the self-employment tax deduction. Using the example above, you would deduct $3,533 (half of $7,065) from your $50,000 net profit, leaving $46,467 subject to income tax.

State and local taxes on 1099 income

Most states tax 1099 income the same way they tax W-2 income. You owe state income tax on your net profit at your state's rate. Some states have no income tax (including Florida, Texas, and Wyoming), so residents of those states owe only federal tax.

If you work in a city with a local income tax — such as New York City, Philadelphia, or Columbus — you may owe local tax as well. Local rates are typically 1% to 3.8% of net profit. You pay these taxes when you file your state and local returns, usually in April, or through quarterly estimated payments if required by your state.

Quarterly estimated tax payments

The IRS expects you to pay taxes as you earn money, not wait until April. If you expect to owe $1,000 or more in federal income tax and self-employment tax combined, you should make quarterly estimated tax payments. These are due April 15, June 15, September 15, and January 15 of the following year.

To calculate your quarterly payment, estimate your total net profit for the year, calculate your expected federal income tax and self-employment tax, then divide by four. If your income is uneven across quarters, you can pay more in high-earning quarters and less in low ones. You make payments to the IRS using Form 1040-ES or through the IRS Direct Pay system on IRS.gov.

If you don't make quarterly payments and owe more than $1,000 at tax time, you will owe an underpayment penalty in addition to the taxes themselves. The penalty amount depends on how much you underpaid and for how long.

Deductions that lower your 1099 tax bill

The more business expenses you deduct, the lower your net profit and the lower your total tax. Common deductions for 1099 contractors include office supplies, software subscriptions, professional development, equipment (depreciated over time), vehicle mileage at the IRS standard rate, home office space (either a percentage of rent or mortgage interest plus utilities, or a simplified $5 per square foot), and health insurance premiums you pay yourself.

You must keep receipts and records for all deductions. The IRS can ask you to prove an expense, and if you cannot, you lose the deduction and may owe penalties. Track expenses as they happen rather than trying to reconstruct them in March.

You can also deduct half of your self-employment tax, as mentioned above. This is automatic and does not require receipts — you calculate it on your tax return.

What happens if you don't pay estimated taxes

If you owe more than $1,000 in taxes and do not make quarterly payments, the IRS charges an underpayment penalty. The penalty is calculated based on the federal short-term interest rate plus 3%, applied to the amount you underpaid for each quarter. In 2024, this rate is around 8% annually, but it changes quarterly.

You can avoid the penalty if you pay 90% of your 2024 tax bill through quarterly payments, or 100% of your 2023 tax bill (110% if your 2023 adjusted gross income was over $150,000), whichever is smaller. If you miss a quarterly important date, you can still make the payment late and reduce the penalty, though you will still owe interest.

Frequently Asked Questions

Do I owe taxes on 1099 income if I also have a W-2 job?

Yes. Your W-2 and 1099 income are combined to determine your tax bracket and total tax owed. You owe self-employment tax on the 1099 income (15.3%) in addition to income tax. Your W-2 employer withholds income tax from your paychecks, but they do not withhold anything for 1099 income, so you need to pay estimated taxes or make a large payment in April.

Can I deduct business losses from my 1099 income?

If your business expenses exceed your 1099 income in a year, you have a net loss. You can deduct this loss from other income, such as W-2 wages or investment income, which lowers your total tax bill. However, if you have consistent losses over multiple years, the IRS may question whether the activity is a real business or a hobby, and disallow the deductions.

What if I receive a 1099 but the amount is wrong?

Contact the person or company that issued it and ask them to send a corrected version. The IRS receives a copy of every 1099, so if the amount on your return does not match what they have on file, you may be contacted. If you cannot get a corrected 1099, you can still file your return with the correct amount and attach a statement explaining the discrepancy.

Do I need to file a tax return if my 1099 income is very small?

You must file a federal return if your net profit from self-employment is $400 or more, even if your total income is below the standard deduction. If your net profit is under $400, you do not have to file federally, but you may still want to if taxes were withheld from other income or if you are due a refund.