In this guide
1. What is self-employment tax?
When you're an employee, your employer splits a specific set of taxes with you — they pay half and you pay the other half through paycheck withholding. When you work for yourself, there's no employer. So you pay both halves. That's self-employment tax, and it's one of the biggest financial surprises for people new to freelancing or gig work.
Self-employment tax covers two programs: Social Security (12.4%) and Medicare (2.9%), for a combined rate of 15.3%. That's on top of ordinary income tax — meaning your total tax burden as a self-employed person is significantly higher than a salaried employee at the same income level.
The good news: the IRS built a partial offset into the system. You're allowed to deduct half of your SE tax from your gross income when calculating your federal income tax. It doesn't eliminate the hit, but it softens it meaningfully.
2. Who has to pay SE tax?
You owe SE tax if your net self-employment income is $400 or more in a year. That's the IRS threshold — extremely low, which catches a lot of people off guard.
You're considered self-employed if you:
- Freelance or do contract work (writing, design, development, consulting, etc.)
- Drive for Uber, Lyft, DoorDash, Instacart, or any other gig platform
- Sell on Etsy, eBay, Poshmark, or similar marketplaces as a business
- Operate any sole proprietorship or single-member LLC
- Receive 1099-NEC or 1099-K forms instead of a W-2
- Do any side work for cash (handyman, tutoring, lawn care, etc.)
3. How SE tax is calculated
The IRS doesn't apply SE tax to 100% of your net income — they apply it to 92.35%. This percentage accounts for the "employer share" deduction (since a regular employer could deduct their half of FICA as a business expense). Here's the math step by step:
| Step | Description | Example ($60,000 net income) |
|---|---|---|
| 1 | Start with net self-employment income | $60,000 |
| 2 | Multiply by 92.35% (IRS reduction) | $55,410 |
| 3 | Apply Social Security rate (12.4%) | $6,871 |
| 4 | Apply Medicare rate (2.9%) | $1,607 |
| 5 | Total SE tax | $8,478 |
| 6 | SE deduction (half of SE tax, reduces income tax) | − $4,239 |
The 2025 Social Security wage base
Social Security tax (the 12.4% portion) only applies to the first $176,100 of net self-employment income in 2025. Above that threshold, you only pay the 2.9% Medicare tax. High earners also owe an Additional Medicare Tax of 0.9% on income above $200,000 (single filers) or $250,000 (married filing jointly).
| Income level | Social Security (12.4%) | Medicare (2.9%) | Additional Medicare (0.9%) |
|---|---|---|---|
| Up to $176,100 | ✓ Applies | ✓ Applies | — |
| $176,101 – $200,000 (single) | — | ✓ Applies | — |
| Over $200,000 (single) | — | ✓ Applies | ✓ Applies |
4. Quarterly estimated tax payments
Unlike salaried employees whose taxes are withheld automatically, self-employed workers pay taxes themselves — and the IRS expects you to do it four times a year, not just at tax filing time. These are called estimated tax payments.
If you skip quarterly payments and pay everything in April, the IRS charges an underpayment penalty — even if you pay everything owed by the deadline. The penalty is calculated per quarter, so you can owe it even if your annual tax bill is zero.
2025 quarterly payment deadlines
| Quarter | Income period | Due date |
|---|---|---|
| Q1 2025 | Jan 1 – Mar 31 | April 15, 2025 |
| Q2 2025 | Apr 1 – May 31 | June 16, 2025 |
| Q3 2025 | Jun 1 – Aug 31 | September 15, 2025 |
| Q4 2025 | Sep 1 – Dec 31 | January 15, 2026 |
You pay quarterly estimated taxes through the IRS Direct Pay website (irs.gov/payments) or by mailing IRS Form 1040-ES. Most people use Direct Pay — it's free and posts immediately.
5. Deductions that reduce your SE tax
Every dollar you deduct as a legitimate business expense reduces your net self-employment income — which directly reduces your SE tax. This is the single most powerful tool available to gig workers and freelancers.
Common deductible expenses for gig workers
| Expense category | Examples | Notes |
|---|---|---|
| Mileage | Driving for rideshare, delivery, client visits | $0.70/mile standard rate in 2025 |
| Home office | Dedicated workspace in your home | Must be used exclusively for work |
| Phone & internet | Business portion of monthly bill | Prorate if also personal use |
| Equipment | Laptop, camera, tools, vehicle accessories | May deduct in full via Section 179 |
| Software & subscriptions | Design tools, accounting software, project apps | Business use only |
| Health insurance | Premiums for yourself and family | Above-the-line deduction if self-employed |
| Retirement contributions | SEP-IRA, Solo 401(k), SIMPLE IRA | Reduces both income tax and SE tax base |
| Professional services | Accountant, lawyer, business consultant | Fully deductible |
| Platform fees | Uber, Fiverr, Etsy, Upwork fees | Deduct from gross receipts |
The self-employed health insurance deduction
If you pay for your own health insurance (not through a spouse's employer plan), you can deduct 100% of your premiums as an above-the-line deduction. This reduces your adjusted gross income — which in turn reduces your income tax, though not SE tax directly. It's one of the most valuable deductions available to self-employed individuals.
Retirement accounts: the best tax move for freelancers
Contributing to a SEP-IRA or Solo 401(k) is the most powerful tax reduction available to self-employed people. SEP-IRA contributions can be up to 25% of net self-employment income, up to $69,000 in 2025. Solo 401(k) limits are even higher. These contributions reduce your net income for income tax purposes — though they don't reduce SE tax directly, since SE tax is calculated before the retirement deduction.
6. How to file and pay
SE tax is reported on Schedule SE, which is attached to your Form 1040 annual return. Your net self-employment income comes from Schedule C, where you report business income and expenses. Most tax software handles all of this automatically once you enter your 1099 income and expenses.
What you'll need at tax time
- 1099-NEC forms from any client who paid you $600+ during the year
- 1099-K forms from payment platforms (PayPal, Venmo for Business, Stripe, etc.)
- Records of all business expenses (receipts, mileage logs, bank statements)
- Records of any estimated tax payments you made during the year
7. Common mistakes gig workers make
Not setting money aside throughout the year
The most common and painful mistake. Because no one withholds taxes from your gig income, it's easy to spend everything you earn — and then owe thousands in April. The fix: every time you get paid, immediately move 25–30% to a separate savings account earmarked for taxes. Treat it like it's already gone.
Missing quarterly payment deadlines
The IRS charges an underpayment penalty for each quarter you miss — not just an annual one. Even if you end up paying everything in full by April 15, you can still owe quarterly penalties. Set calendar reminders for all four deadlines every year.
Not tracking mileage in real time
Reconstructing a year of driving from memory is nearly impossible. A free app like Stride runs in the background and logs every work trip automatically. One year of tracked mileage can easily save you $500–$2,000 in taxes.
Forgetting platform fees are deductible
If you drive for Uber, they take a commission. If you sell on Etsy, they take fees. Those fees are business expenses — deduct them from your gross revenue before calculating net income. Some platforms report gross income on 1099-K forms, so you need to subtract the fees yourself.
Mixing personal and business finances
When your business and personal money go through the same account, tracking expenses becomes a nightmare. Open a free business checking account (Lili and Novo are both free and gig-worker friendly) and run all business income and expenses through it.
Waiting until April to think about taxes
Tax planning done in January is worth far more than tax filing done in April. Decisions about retirement contributions, equipment purchases, and business structure made throughout the year have a much bigger impact than anything you can do at filing time.
8. Tools to stay on top of it
The gig workers who handle taxes well aren't necessarily smarter about tax law — they just have better systems. Here are the tools that make the biggest difference:
Beyond dedicated apps, our free calculators on GigWallet cover every key calculation you'll need throughout the year:
- SE Tax Calculator — find out what you owe in self-employment tax
- Quarterly Tax Estimator — calculate each quarterly payment
- Take-Home Pay Calculator — see your real after-tax income
- Mileage Deduction Calculator — calculate your driving deduction
- Freelance Rate Calculator — set a rate that covers your taxes and goals