Self-employment tax on freelance income is the single biggest tax surprise for people who leave a paycheck behind, and it’s also one of the easiest to plan for once you know the formula. Everything about it fits on one page: a rate, a base, a cap and a deduction.
This post walks through the calculation line by line with a worked example, shows how it compares with what an employee pays, and then moves to the part that matters most, which is what to do about it. You’ll see how to build it into your rate, how legitimate business expenses change the bill, which deductions don’t change it, and how to pay it on schedule. I’m keeping the tone positive because the rules are clear and the numbers are manageable when you see them in advance.
What the Tax Is and Who Owes It
IRS Topic 554 says the self-employment tax rate consists of 12.4% for Social Security and 2.9% for Medicare, which adds up to 15.3%. It applies to self-employed people, a group the IRS describes as including sole proprietors, independent contractors, partners and certain LLC members. You usually must pay it if your net earnings from self-employment were $400 or more.
Publication 334, the IRS tax guide for small business, puts it the same way: the rate on net earnings is 15.3%, you file Schedule SE with your Form 1040 if net earnings are $400 or more, and you deduct one-half of the self-employment tax as an adjustment to income.
The reason the rate looks high is that an employee only pays half. An employer normally pays the other half, which is why an employee’s payroll tax rate is 7.65%. When you work for yourself, you’re both. That’s not a penalty. It’s the same money, now coming from the person who used to get it from the employer.
The Calculation in Four Steps
- Start with net earnings from self-employment. That’s your revenue minus your allowable business expenses, which the IRS calls net profit.
- Multiply by 92.35%. Topic 554 says the taxable amount is 92.35% of your net earnings.
- Apply 12.4% to Social Security and 2.9% to Medicare. The Social Security part stops at an annual limit.
- Deduct half of the total when you compute adjusted gross income.
Here is how it plays out with a made-up freelancer who has $60,000 in net profit.
| Line | Amount |
|---|---|
| Net profit | $60,000.00 |
| × 92.35% | $55,410.00 |
| Social Security 12.4% | $6,870.84 |
| Medicare 2.9% | $1,606.89 |
| Total | $8,477.73 |
The total is 14.13% of the original $60,000. The 92.35% step is why it isn’t a flat 15.3%. Half of the total, about $4,238.87, comes off the freelancer’s adjusted gross income, which lowers income tax a little. If this person’s income falls in the 12% bracket, that deduction saves roughly $508.66 in income tax (12% of $4,238.87).
How This Compares With an Employee
An employee earning the same $60,000 pays 7.65% in Social Security and Medicare, which is $4,590. The freelancer’s $8,477.73 is $3,887.73 higher. That gap is the employer’s share, and it’s the reason a freelance rate needs to sit above an old wage. It’s the other half of a bill that used to be paid on your behalf.
The Bureau of Labor Statistics data I use in my other posts says legally required benefits were 7.2% of total employer compensation in June 2026, with 6.0% going to Social Security and Medicare. When you freelance, you cover that line yourself, so it needs a home in your pricing.
The Cap: What Happens at Higher Income
The Social Security part has a ceiling. The Social Security Administration lists $184,500 as the 2026 contribution and benefit base. Publication 334 explains the idea for 2025 as a limit on combined wages, tips and net earnings from self-employment, so if you also have a paying job, the cap applies to the total.
Here’s what that looks like for a freelancer with $200,000 in net profit and no wages.
- 92.35% of $200,000 is $184,700.
- Social Security: the base is capped at $184,500, so 12.4% gives $22,878.00.
- Medicare: 2.9% of $184,700 gives $5,356.30.
- Total: $28,234.30, or 14.12% of profit.
An employee earning $200,000 would pay only the employee half, which is 6.2% on the first $184,500 plus 1.45% on all $200,000, or $14,339, with the employer paying a matching amount. Past the cap, each extra dollar of profit adds only the Medicare piece, about 2.68% (0.029 × 0.9235).
If your net profit is well under the cap, the 14.13% figure is the one to remember.
Step One for Pricing: Add It to Your Rate
The simplest way to handle self-employment tax on freelance income is to build it into the same formula you use to set your rate. In my post on the freelance hourly rate, I work backward from an after-tax goal through self-employment tax and income tax. Use that method, and the tax is covered every time you invoice.
If you want a quick estimate while you’re in a conversation, remember that every $1,000 of profit carries about $141.30 of self-employment tax (1,000 × 0.9235 × 0.153). Income tax is separate and comes on top. This is a one-line sanity check, not a replacement for the full formula.
Step Two: Let Real Business Expenses Work for You
Self-employment tax is figured on net profit, so legitimate business expenses reduce it. Each $1,000 of allowable expense lowers the self-employment tax by about $141.30, and it lowers income tax too.
The word that matters is allowable. Publication 583 describes the records to keep. It suggests keeping a business checking account separate from your personal one, and it says supporting documents like receipts, invoices and canceled checks should be kept in an orderly way and a safe place. If you don’t track expenses, you pay tax on money you already spent. If you do, you only pay on what you kept.
A few examples of categories Publication 583 highlights: start-up costs, depreciation, business use of your home and car and truck expenses. Separately, the IRS set the 2026 business standard mileage rate at 72.5 cents a mile.
What Does Not Reduce Self-Employment Tax
Some deductions cut your income tax without touching the self-employment tax, and it helps to know the difference so your estimate isn’t too low.
- The half-of-SE-tax deduction reduces adjusted gross income, but it doesn’t change the self-employment tax itself.
- The self-employed health insurance deduction is explicit in the IRS instructions for Form 7206: it doesn’t reduce net earnings for self-employment tax.
- The standard deduction applies to income tax only.
So when you estimate your payments, calculate self-employment tax on net profit before those deductions, then calculate income tax on the lower figure.
Two Quick Case Studies
Numbers stick better with contrasts, so here are two more scenarios that show how the pieces move. Both use made-up people.
More expenses, less tax. Imagine a freelancer with $75,000 of revenue. If business expenses are $5,000, net profit is $70,000 and self-employment tax is $9,890.69. If expenses are $15,000, net profit is $60,000 and the tax is $8,477.73. That $10,000 of additional allowable expense cuts self-employment tax by $1,412.96, and it cuts income tax too. This is why records matter: unrecorded expenses are the same as extra profit on paper. Remember that an expense has to be a real business cost to count, and spending money only to lower your tax is a poor trade.
A day job plus side income. Suppose someone earns $180,000 in wages and has $20,000 of side net profit. Publication 334 explains the Social Security limit as applying to combined wages, tips and net earnings from self-employment. Using the 2026 base of $184,500, only $4,500 of room is left. The taxable base for the side income is $18,470 (92.35% of $20,000). Social Security tax is limited to 12.4% of $4,500, or $558.00, and Medicare is 2.9% of $18,470, or $535.63. The total is $1,093.63. Without a day job, the same $20,000 of profit would carry $2,825.91 of self-employment tax. The salary used up most of the Social Security room, so the side income is cheaper to tax.
I like that second case because it shows the cap working in your favor.
What Self-Employment Tax Buys
It’s easy to see this as a pure cost, but IRS Topic 554 describes it as the Social Security and Medicare tax for people who work for themselves, so it’s how self-employed people contribute to those programs. Seeing it that way can make the number feel less like a toll.
Step Three: Pay It on Schedule
The IRS estimated tax FAQ says you generally must make estimated payments if you expect to owe at least $1,000 after subtracting withholding and refundable credits. The due dates run on a four-part calendar: April 15 for income from January through March, June 15 for April and May, September 15 for June through August, and January 15 of the following year for September through December. Self-employed people who owe both income tax and self-employment tax can pay quarterly, or pay the full amount by the first due date.
Publication 334 points to Form 1040-ES for figuring the payments. I wrote separately about the penalty safe harbors, so I’ll leave those there and focus on a practical habit: divide your expected self-employment tax by four, add your estimated income tax, and move that amount into a separate savings account each quarter. In the $60,000 example, the self-employment portion alone is about $2,119 a quarter.
What Changes When You Have a Day Job Too
Some freelancers start with side income. If you have wages, your employer already withholds Social Security and Medicare on them. Your freelance profit is still subject to self-employment tax if net earnings reach $400. Publication 334 notes that the Social Security limit applies to the combined total of wages, tips and net earnings, so a high salary can leave less room under the cap for your freelance profit.
For side income, the question is mostly about cash, and my suggestion is to set aside about 14% of your net profit for self-employment tax, plus your income tax on top, so April doesn’t bring a surprise.
A Quick Look at Small Profits
Self-employment tax on freelance income scales evenly below the cap, which makes small jobs easy to price. Suppose your freelance profit for the year is only $10,000. The self-employment tax comes to $1,412.96. At $30,000 it’s $4,238.87, and at $90,000 it’s $12,716.60. The percentage stays at about 14.13% until you reach the cap. Knowing that makes small projects easier to price. If a $500 job nets $400 after costs, about $56 of it belongs to self-employment tax before income tax.
Mistakes That Make the Bill Bigger
- Treating revenue as profit. The tax is on net earnings. Track your expenses.
- Applying 15.3% to the wrong base. Use 92.35% of net profit first.
- Forgetting the half deduction. Half of the tax comes off adjusted gross income.
- Assuming a deduction lowers SE tax. The health insurance deduction doesn’t, according to the Form 7206 instructions.
- Spending everything and paying in April. A separate account for taxes makes the bill predictable.
- Ignoring the $400 line. Below it you usually don’t owe; at or above it you do.
- Using last year’s cap. The Social Security base changes every year.
Ask AI to Calculate It With You
Paste this into an AI assistant and replace the brackets.
Help me calculate my self-employment tax using ONLY the numbers I give you.
My expected revenue for the year: $[amount]
My business expenses: $[amount]
Wages from a job, if any: $[amount]
Tax year rules to use (confirm with the IRS and SSA): SE tax rate 12.4% Social Security + 2.9% Medicare, applied to 92.35% of net profit, Social Security base $[amount]
Rules:
- Ask me for anything missing before you calculate.
- Do not give tax advice and do not guess any number I did not provide.
- Show every step: net profit, times 92.35%, Social Security part (capped at the base, reduced by any wages I entered), Medicare part, total, the total as a percent of net profit, and half of the total as the AGI deduction.
- Show what the tax would be for each additional $1,000 of expenses.
- Show a quarterly amount (total divided by four) and the four IRS due dates.
- State that the additional Medicare tax, state taxes and income tax are not included.
- Tell me which numbers to confirm on IRS.gov and SSA.gov.
- End with a checklist and a date to recalculate.
My Take: A Predictable Bill Is a Manageable Bill
What I like about this tax is its predictability. A rate, a base, a cap and a deduction. Once you’ve done the calculation for one year, you can estimate it for the next with a calculator in under a minute.
I also think it helps to reframe it. You’re paying both halves of something your employer used to pay half of, and the cost is already included in your price if you use a proper formula. A freelancer who has priced in the 14.13% doesn’t feel it as a penalty. It’s just part of the cost of doing business, like software or insurance.
Questions About the Tax
What is the self-employment tax rate? IRS Topic 554 describes 12.4% for Social Security plus 2.9% for Medicare, a combined 15.3%, applied to 92.35% of net earnings. That is about 14.13% of net profit.
Do I owe it on small amounts? You usually must pay it if net earnings are $400 or more, according to the IRS.
Is there a cap? The Social Security part has one. For 2026 the Social Security Administration lists $184,500.
Can I deduct part of it? Yes. You deduct one-half of the self-employment tax when you figure adjusted gross income, per Topic 554 and Pub 334.
Does the health insurance deduction reduce it? No. The Form 7206 instructions say that deduction doesn’t reduce net earnings for self-employment tax.
Do I have to pay quarterly? If you expect to owe at least $1,000, the IRS says you generally must make estimated payments. Self-employed people can pay quarterly or in full by the first due date.
Your Plan for This Week
To get a grip on self-employment tax on freelance income, calculate last year’s net profit, multiply by 14.13%, and move that amount into a separate account over the next few months. Then write the four payment dates in your calendar. That’s a solid start.
This post is general information, not tax, legal or financial advice. Tax rules and limits change, the examples use made-up numbers and leave out state tax, the additional Medicare tax and other items, and your results will differ. Confirm figures on IRS.gov and talk to a qualified tax professional about your situation.
Sources:
- Topic no. 554, Self-employment tax — Internal Revenue Service
- Contribution and Benefit Base — Social Security Administration
- Publication 334, Tax Guide for Small Business — Internal Revenue Service
- Publication 583, Starting a Business and Keeping Records — Internal Revenue Service
- Estimated tax — Internal Revenue Service
- Instructions for Form 7206, Self-Employed Health Insurance Deduction — Internal Revenue Service
- Employer Costs for Employee Compensation, June 2026 — Bureau of Labor Statistics
- IRS sets 2026 business standard mileage rate at 72.5 cents per mile — Internal Revenue Service