💼 Side Hustle & 1099 Taxes · Updates live as you type · Set-aside %, quarterly payments, and deduction impact
Inputs

Your Income Details

Filing & Job Income

Enter $0 if the side hustle is your only income

Your Side Hustle

Total 1099/gig/freelance income before expenses, for the year

Mileage, supplies, home office, software — check your mileage log or bank statements

Optional: Retirement & State Tax
0%

% of net profit set aside in a SEP-IRA or Solo 401(k)

Enter 0 for no-income-tax states (TX, FL, WA, NV, etc.)

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Results update live as you type

Side Hustle Taxes, Explained: What This Calculator Does

This calculator estimates the total tax bill on your 1099, freelance, or gig income — and tells you exactly what percentage of every dollar you should set aside before you spend it. It takes your W-2 job income (if any), your side hustle's gross income and deductible expenses, an optional self-employed retirement contribution, and your estimated state tax rate. From those inputs, it calculates self-employment tax, the incremental federal income tax your side income adds on top of your job income, your state tax, a quarterly estimated payment schedule, and a side-by-side comparison showing what tracking your expenses is actually worth in dollars.

When Should You Use This?

Use this the moment you start earning 1099 income and realize nobody is withholding taxes for you. It's built for the rideshare or delivery driver trying to figure out how much of each week's deposit is actually theirs to keep. It's for the freelance designer or consultant who just landed their first client and wants to avoid an ugly surprise next April. It's for the Etsy seller, the tutor, the photographer, or the person renting out gear on the side who wants to know: how much of this should I actually be setting aside, and do I need to send the IRS money four times a year instead of once?

How to Read Your Results

The large number at the top — Set Aside for Taxes — is the total you should hold back from your side hustle earnings across the year: self-employment tax, the extra federal income tax your side income triggers (because it stacks on top of your W-2 income at your marginal rate, not from zero), and your estimated state tax. The three chips below break that number into its parts. Self-employment tax is usually the biggest surprise — it's 15.3% of roughly 92.35% of your net profit, covering both the employee and employer halves of Social Security and Medicare that a traditional job would split with you.

The Combined Marginal Rate stat shows what your very next side-hustle dollar is taxed at once federal, self-employment, and state tax are all stacked together. Many people expect their side income to be taxed at a low starter rate, similar to the first dollars they earn at a new job. In reality, because your W-2 wages already filled the lower brackets, side income lands on top — often pushing the combined rate on that next dollar to 30–45%, sometimes higher.

A Real-World Example

Priya works full-time as a nurse earning $55,000 a year, and spends weekends shooting weddings as a freelance photographer. In 2026 she brings in $12,000 from photography and can document $2,000 in deductible expenses — camera gear maintenance, mileage to venues, and photo-editing software. Her net profit is $10,000. Self-employment tax on that profit comes to roughly $1,413. Because her W-2 job already fills her 10% and most of her 12% bracket, her photography profit stacks on top and adds about $1,115 in federal income tax — still taxed at her 12% marginal bracket, just on top of her wages rather than from zero. With a 5% state rate, she owes another $500. All in, Priya should set aside close to $3,028 — about 25% of her $12,000 gross photography income — before she spends a dime of it on new lenses. Using the scenario comparison, she also discovers that if she hadn't tracked her $2,000 in expenses, she'd have owed several hundred dollars more, and that directing 15% of her net profit into a SEP-IRA would lower her bill further while building retirement savings.

Common Mistakes People Make With Side Hustle Taxes

Spending 100% of what lands in your bank account. Payment app deposits and client checks arrive tax-free at the moment you receive them — nothing is withheld like it is from a paycheck. The single most common and most expensive mistake is treating gross side-hustle income as if it were all spendable, then scrambling every April to cover a bill that was entirely predictable months earlier.

Forgetting that self-employment tax is separate from income tax. Many first-time freelancers budget only for the income tax bracket they expect to fall into, not realizing the 15.3% self-employment tax applies on top of — not instead of — regular income tax. It's the single biggest gap between what people expect to owe and what they actually owe.

Not tracking deductible expenses throughout the year. Mileage logs, receipts for supplies, and a reasonable home-office allocation all reduce taxable profit — which reduces both income tax and self-employment tax simultaneously. Reconstructing a year of expenses from memory in March means missing deductions and overpaying. A simple spreadsheet or expense app updated weekly pays for itself many times over.

Missing quarterly estimated payment deadlines. If you expect to owe $1,000 or more in tax beyond what's withheld from a W-2 job, the IRS expects estimated payments in April, June, September, and January — not one payment at filing time. Missing these deadlines can trigger an underpayment penalty even if you pay everything you owe by April 15.

What the Numbers Don't Tell You

This calculator uses a flat estimated state tax rate rather than your state's actual bracket structure, since state tax rules vary enormously and some states have local or city-level taxes on top. It also doesn't know about income from other sources — capital gains, a spouse's separate self-employment income, or a second side hustle — all of which can shift your marginal bracket and change these numbers meaningfully.

It applies the IRS "safe harbor" concept only loosely: officially, you can avoid an underpayment penalty by paying the smaller of 90% of this year's tax or 100% (110% for higher earners) of last year's tax, spread across the year. If your income is irregular quarter to quarter, the IRS also allows an "annualized income" method that can lower individual quarterly payments — something this calculator does not model, since it requires your quarter-by-quarter income breakdown.

Finally, the self-employed retirement contribution shown here (SEP-IRA or Solo 401(k)) is an approximation — actual contribution limits depend on the specific plan type, your net earnings after the self-employment tax deduction, and annual IRS caps. A CPA or plan provider can confirm the exact maximum you're eligible to contribute.

Related Calculators

If your side hustle has grown into your primary source of income, or you're weighing a full-time freelance jump, run the Income Tax Estimator next to see your full effective and marginal rate across all income sources in one place.

Wondering whether your side hustle actually pays once you factor in your time, gas, and gear? The True Hourly Wage Calculator strips out hidden costs to show your real per-hour rate.

If you're deciding how much of your side income to route into pre-tax savings, check the Paycheck Calculator to see how adjusting your W-2 withholding could offset what you owe from self-employment income, so you're not caught short at tax time.

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