Maybe you drive for Uber on weekends. Maybe you sell vintage clothes on Depop. Maybe you do freelance graphic design after your 9-to-5. Whatever it is, if you are earning money outside of a regular W-2 job, you have a side hustle — and the IRS considers it taxable income.
The tricky part is that nobody automatically withholds taxes from your side-hustle earnings. When you have a regular job, your employer handles all of that for you. But when you are your own boss — even part-time — the responsibility falls on you. And if you ignore it, you could end up owing a lot more than you expected at tax time, plus penalties on top.
So let us break it all down. No fancy accounting speak — just the stuff you actually need to know.
When Does the IRS Care About Your Side Hustle?
The short answer: as soon as you earn $400 or more in net self-employment income in a year. That is not $400 per gig or per month — it is $400 total for the entire year, after expenses. Once you cross that line, you owe self-employment tax, and you need to report it on your tax return.
Technically, all income is taxable regardless of the amount. Even if you earn $200 from selling stuff online, you are supposed to report it. But the $400 threshold is where self-employment tax kicks in, which is the bigger deal.
If a company or client pays you $600 or more in a year, they are required to send you a 1099-NEC form. This form tells both you and the IRS how much they paid you. But even if you do not receive a 1099 — maybe because each client paid you less than $600 — you still need to report all your earnings.
Want to estimate what you will owe on your 1099 income? Our 1099 tax calculator gives you a clear picture in seconds.
What Exactly Is Self-Employment Tax?
When you work for an employer, you and your employer each pay half of Social Security and Medicare taxes. Your share is 7.65%, and your employer matches it with another 7.65%. You probably see this on your pay stub as "FICA."
When you are self-employed, you are both the employee and the employer. That means you pay both halves — a total of 15.3%. That breaks down as 12.4% for Social Security (on earnings up to $176,100 in 2025) and 2.9% for Medicare (on all earnings, with no cap).
If your net self-employment income is above $200,000 ($250,000 for married filing jointly), you also pay an additional 0.9% Medicare surtax on the amount over that threshold.
The good news is that you get to deduct the employer-equivalent portion (half of self-employment tax) when calculating your adjusted gross income. This does not reduce your self-employment tax itself, but it does lower your income tax. Use our self-employment tax calculator to see exactly how this works with your numbers.
How to Figure Out Your Side Hustle Profit
You do not pay tax on every dollar that comes in — you pay tax on your profit. That is your total income minus your business expenses. And you would be surprised how many expenses you can deduct.
Common deductions for side hustlers include:
- Supplies and materials — anything you buy to do the work
- Software and subscriptions — design tools, accounting apps, website hosting
- Mileage — if you drive for your side hustle, the 2025 standard mileage rate is 70 cents per mile
- Home office — if you use part of your home exclusively for your business, you can deduct a portion of your rent, utilities, and internet
- Phone and internet — the business-use percentage of your phone bill
- Advertising and marketing — website costs, social media ads, business cards
- Professional development — courses, books, and workshops related to your side hustle
Keeping track of these expenses throughout the year is crucial. A simple spreadsheet works fine, or you can use an app like QuickBooks Self-Employed or Wave. The key is to keep receipts and records — the IRS can ask to see them if they audit you.
If you work from home, our home office deduction calculator can help you figure out how much you can write off.
Quarterly Estimated Taxes — Do Not Skip These
Here is where a lot of side hustlers get caught off guard. If you expect to owe $1,000 or more in taxes for the year, the IRS expects you to pay estimated taxes quarterly — not just once a year when you file your return.
The due dates for 2025 estimated tax payments are:
- April 15, 2025 (for Q1: January–March)
- June 16, 2025 (for Q2: April–May)
- September 15, 2025 (for Q3: June–August)
- January 15, 2026 (for Q4: September–December)
If you do not make these payments on time, the IRS charges an underpayment penalty. It is not the end of the world, but it is an annoying and completely avoidable expense.
The easiest way to estimate your quarterly payments is to use our quarterly tax calculator. It helps you figure out how much to set aside each quarter so you are never caught short.
How Much Will You Actually Take Home?
Let us run through a quick example. Say you earn $20,000 from freelance work and have $4,000 in business expenses. Your net profit is $16,000.
- Self-employment tax (15.3%): About $2,262 (calculated on 92.35% of net earnings)
- Half of SE tax deduction: $1,131 (reduces your adjusted gross income)
- Income tax: Depends on your total income and filing status, but if this is your only income and you are single, your taxable income after the standard deduction would be about $16,000 – $1,131 – $15,000 = basically $0 in federal income tax
But if you also have a W-2 job paying $50,000, that side-hustle income gets stacked on top. You have already used up your standard deduction on your W-2 income, so the full $16,000 (minus half of SE tax) gets taxed at your marginal rate — which could be 22% or higher. That is an extra $3,000+ in income tax on top of the self-employment tax.
This is exactly why running your numbers matters. Our side hustle tax calculator shows you the combined picture when you have both W-2 and 1099 income.
Setting the Right Rate for Your Work
One thing a lot of new freelancers get wrong is pricing their work too low. When you are an employee, your employer covers half of your FICA taxes, plus benefits like health insurance, paid time off, and retirement contributions. When you are freelancing, all of that comes out of your own pocket.
A good rule of thumb is that your freelance rate should be at least 25–40% higher than what you would accept as an hourly employee, just to break even. Our freelancer rate calculator helps you figure out the right number based on your expenses and desired take-home pay.
Record-Keeping Tips That Will Save You Headaches
Open a separate bank account. Mixing personal and business money is a recipe for confusion at tax time. A separate checking account makes it much easier to track income and expenses.
Save 25–30% of every payment. This is a common recommendation from accountants, and it works. Every time you get paid for side-hustle work, move 25–30% into a savings account earmarked for taxes. When quarterly payments come due, the money is already there.
Track mileage as it happens. Trying to reconstruct a year's worth of driving from memory in April is a nightmare. Use a mileage tracking app and log trips when you take them.
Keep digital copies of receipts. Paper fades and gets lost. Snap a photo of every business receipt and save it in a folder. Many accounting apps let you do this automatically.
The Bottom Line
Having a side hustle is a great way to earn extra money, build skills, and even test out a business idea. But the tax side of things can bite you if you are not prepared. The most important things to remember are: report all your income, track your expenses, make quarterly estimated payments if you owe more than $1,000, and set money aside from every payment.
Take five minutes to run your numbers through our 1099 tax calculator and see where you stand. Knowing what you owe — before tax day arrives — is one of the best financial habits you can build.