Starting a side hustle is a smart way to build extra income — but the tax rules are different from regular employment, and the surprises can be expensive. Side hustle income is self-employment income, which means you owe both income tax and self-employment tax on it, with no employer withholding anything on your behalf. Understanding the basics before you start saves you from an unwelcome tax bill.
Side hustle income is self-employment income
When you earn money from freelancing, driving for a rideshare service, selling on Etsy, tutoring, dog walking, or any other gig — that income is self-employment income, not wages. The differences matter:
- No automatic withholding. Your employer withholds income tax and FICA from your paycheck. Side hustle income arrives without any withholding. You’re responsible for paying the taxes yourself.
- Self-employment tax. Regular employees pay 7.65% in FICA (Social Security and Medicare). Their employer pays another 7.65%. When you’re self-employed, you pay both halves — 15.3% — on top of regular income tax.
- Quarterly estimated payments. Because nothing is withheld, the IRS expects you to pay estimated taxes four times a year.
The self-employment tax rate
The self-employment (SE) tax rate is 15.3% on net self-employment earnings up to $176,100 (2025), plus 2.9% on earnings above that threshold (Medicare portion only, no cap).
That 15.3% is on top of your regular income tax bracket. A person in the 22% federal income tax bracket pays approximately 37–39% total marginal rate on side hustle income — not 22%.
| Net Side Income | Income Tax (22% bracket est.) | SE Tax (15.3%) | Total Federal Tax |
|---|---|---|---|
| $3,000 | ~$660 | ~$424 | ~$1,084 |
| $10,000 | ~$2,200 | ~$1,413 | ~$3,613 |
| $25,000 | ~$5,500 | ~$3,532 | ~$9,032 |
These are approximate — your actual liability depends on your total income, filing status, and deductions. But the table shows why “I only made $10,000 on the side” can still generate a substantial tax bill.
One partial relief: you can deduct half of the SE tax from your gross income on Schedule 1 of your 1040, which slightly reduces your income tax base.
The quarterly estimated tax schedule
If you expect to owe $1,000 or more in federal taxes for the year that aren’t covered by withholding, the IRS requires quarterly estimated payments. Missing them can trigger an underpayment penalty even if you pay the full amount at tax time.
| Income Period | Estimated Tax Due Date |
|---|---|
| Jan 1 – Mar 31 | April 15 |
| Apr 1 – May 31 | June 16 |
| Jun 1 – Aug 31 | September 15 |
| Sep 1 – Dec 31 | January 15 (following year) |
A practical rule of thumb: save 25–30% of every dollar of net side hustle income for taxes. Set that money aside immediately in a dedicated account — a high-yield savings account works well — so it’s there when the quarterly deadlines arrive.
What side hustle expenses you can deduct
The IRS lets you deduct ordinary and necessary business expenses from self-employment income, which reduces the income you’re taxed on. Legitimate deductions for side hustlers include:
- Equipment and supplies — camera, computer, tools, materials used for the work
- Home office — if you have a dedicated space used only for the side hustle (simplified: $5/sq ft, up to 300 sq ft)
- Vehicle expenses — business miles at the IRS standard mileage rate (about 70 cents/mile in 2025) or actual vehicle costs
- Phone and internet — the business-use percentage is deductible
- Software, subscriptions, and tools — any app, platform fee, or software used for the work
- Professional services — accountant, legal fees related to the business
- Marketing and advertising — social media ads, website, business cards
- Education and training — courses, books, or conferences directly related to the work
- Platform fees — Etsy listing fees, PayPal transaction fees, marketplace commissions
Keep receipts and records. Apps like QuickBooks Self-Employed, Wave, or even a simple spreadsheet help you track expenses by category throughout the year.
How to report side hustle income
Side hustle income is reported on Schedule C (Profit or Loss from Business) attached to your Form 1040. Schedule C is where you list gross income and subtract business expenses to arrive at net profit — the amount you pay both income tax and SE tax on.
Even if you didn’t receive a 1099-NEC (required when a single client pays you $600+), you’re still required to report all self-employment income. The IRS expects you to report every dollar — 1099 or not.
Side hustles and your W-2 withholding
One practical strategy: increase withholding on your main W-2 job to cover taxes on side income. This avoids quarterly estimated payments if your employer can withhold enough. Submit a new W-4 to your employer and increase the additional withholding amount on Line 4c.
This works if your side income is modest and predictable. If side income is large or variable, quarterly estimated payments are usually cleaner.
When a side hustle becomes a business
The IRS distinguishes between a business (profit motive, consistent activity) and a hobby (primarily for pleasure). Hobby income is taxable but hobby expenses aren’t deductible. If you want to deduct expenses, you need to operate like a real business — keep records, try to be profitable, and run it with business intent. The IRS presumes a profit motive if you show a profit in 3 of 5 consecutive years.
Further Reading
- W-2 vs. 1099: What’s the Difference?
- Self-Employment Tax Explained
- Quarterly Estimated Taxes
- What Is a Schedule C?
- Avoid Side Hustle Scams
- Jobs & Career
This article is for general educational purposes only and does not constitute legal, tax, or financial advice. Rules vary by state and employer. Consult a qualified professional for guidance specific to your situation.