How Much to Set Aside for Taxes on a Side Hustle (2026)
Everyone says set aside 25-30%. Here's how much to set aside for taxes on a side hustle in 2026, built from SE tax, your real marginal rate, and your state.
This article is general information, not tax or financial advice. Tax rules change, individual situations vary, and every figure here is an estimate. Confirm specifics with a qualified tax professional before making money decisions.
The 25% rule is a guess. Here’s the actual formula
Search this question and you get the same answer from every result: set aside 25% to 30%. Almost nobody shows where that range comes from, which is a problem, because for a lot of people it is wrong by ten points in one direction or the other.
The arithmetic behind it:
Set-aside % = 14.13% (self-employment tax)
+ your marginal federal rate × 0.929 (× 0.744 if QBI applies)
+ your marginal state rateThree layers. Only the first one is the same for everybody. After that it gets personal: layer two depends on what your day job already pays you, layer three on where you live.
Fix one thing before you use it. Apply the percentage to net profit, not to the money that lands in your account. Net profit is revenue minus business expenses: mileage, software subscriptions, platform fees, supplies, the share of your phone bill you can actually defend. Setting aside a slice of gross payouts is the single most common mistake here, and it works in your favor, which is why nobody catches it until they file.
Layer 1: self-employment tax is 14.13%, not 15.3%
Everyone quotes 15.3%. That is 12.4% for Social Security plus 2.9% for Medicare, and it is the full amount an employee normally splits with an employer. Working for yourself, you pay both halves.
But 15.3% is not applied to your net profit. It is applied to 92.35% of it, a quirk that exists so self-employed people get roughly the same treatment as employees, whose employer-side tax is not counted as their wages.
So the rate that actually hits every dollar of profit is 15.3% × 0.9235 = 14.13%. On $12,000 of net profit, that is $1,696, not $1,836. The gap is small, but this is the floor of your set-aside and it may as well be right.
The wage-base wrinkle if your day job pays well
Your W-2 wages fill the Social Security wage base before your side income touches it. For 2026 that base is $184,500.
Once your wages plus net self-employment earnings clear that line, the 12.4% Social Security portion switches off for the rest of the year and only Medicare keeps running. Your marginal self-employment tax on further profit drops to 2.9% × 0.9235 = 2.68%.
If you make $190,000 at a W-2 job and $15,000 freelancing, your salary has already filled the base, so that $15,000 only picks up the Medicare piece. Layer 1 falls from 14.13% to 2.68%, more than eleven points off your set-aside before you even look at your bracket. (One thing running the other way: the 0.9% Additional Medicare Tax kicks in above $200,000 for single filers and $250,000 for joint filers.) Our breakdown of 1099 versus W-2 take-home pay walks through the same payroll-tax difference from the contractor’s side.
Layer 2: your marginal federal rate, not your average one
Side hustle profit is the last money in the stack. It sits on top of your W-2 wages, so it gets taxed at the highest bracket your combined income reaches, not at your average rate. This is the layer most guides get wrong, and it is the reason a $90,000 earner’s real number is nowhere near 25%.
The 2026 single-filer brackets, applied to taxable income after the $16,100 standard deduction:
| Rate | Taxable income (single) |
|---|---|
| 10% | $0 to $12,400 |
| 12% | $12,400 to $50,400 |
| 22% | $50,400 to $105,700 |
| 24% | $105,700 to $201,775 |
| 32% | $201,775 to $256,225 |
Joint filers hit the 22% bracket at $100,800 and 24% at $211,400. Find where your day job lands you, and that is the rate your side income starts at.
Two deductions shrink the base before that rate applies:
- Half of your self-employment tax comes off above the line, whether or not you itemize. That is 7.065% of net profit, which is where the × 0.929 in the formula comes from.
- The QBI deduction (Section 199A), if your side hustle qualifies, takes up to 20% off. Sole proprietors are squarely eligible and you can claim it alongside the standard deduction. The One Big Beautiful Bill Act made it permanent and added a $400 minimum deduction for anyone with at least $1,000 of active qualified business income starting in 2026. Treat it as conditional, not guaranteed.
Worked example: $70,000 salary, $12,000 side profit
A single filer, tax year 2026.
- Taxable W-2 income: $70,000 minus the $16,100 standard deduction = $53,900, which lands in the 22% bracket
- Self-employment tax: $12,000 × 0.9235 × 0.153 = $1,696
- Half-SE deduction: $848, leaving an income-tax base of $11,152
- QBI deduction at 20% of $11,152: $2,230, leaving $8,922 taxable
- Federal income tax: $8,922 × 22% = $1,963
- Total federal: $3,659 on $12,000, or 30.5%
Without QBI eligibility, the federal income tax is $2,453 and the total is $4,149, or 34.6%. Add a state and either number climbs further. Neither one is 25%.
Layer 3: add your state, then read your number off the table
Run the formula across the common brackets and you get a grid you can find yourself in. These assume marginal state income tax rates, so plug in the top rate your income actually reaches in your state, not an average or effective rate.
| Federal marginal rate | No state income tax | 5% state | 9% state |
|---|---|---|---|
| 12% | ~25% | ~30% | ~34% |
| 22% | ~35% | ~40% | ~44% |
| 24% | ~36% | ~41% | ~45% |
| 32% | ~44% | ~49% | ~53% |
If your side hustle qualifies for the QBI deduction, subtract roughly 2 to 6 points: the 12% row drops to about 23%, the 22% row to about 30%, the 24% row to about 32%.
Look at the two edges. A 12%-bracket filer in Texas, Florida, Washington, Nevada, Tennessee, South Dakota, Wyoming, Alaska or New Hampshire lands near 25%, so the rule of thumb happens to work. A 24%-bracket filer in California, New York or New Jersey lands in the low-to-mid 40s, depending on which state bracket their income reaches. Saving 25% there leaves you nearly half short.
Since your bracket is set by your salary, the day job is doing most of the work in this table. If you have never mapped out what your own paycheck already surrenders, what percent of your paycheck goes to taxes covers the W-2 side of the same math.
Do you actually owe anything? The $400 and $1,000 thresholds
Two numbers get quoted constantly and constantly get mixed up. They do completely different jobs.
$400 is the self-employment tax threshold. Net self-employment earnings of $400 or more mean you owe SE tax and file Schedule SE. Below that, no SE tax. Income tax still applies from the first dollar either way.
$1,000 is the estimated-payment trigger. If you expect to owe $1,000 or more at filing after subtracting withholding, the IRS wants the money during the year rather than in April.
Forms have nothing to do with either one. For 2026 the 1099-NEC threshold rose from $600 to $2,000, and the 1099-K threshold reverted to $20,000 and more than 200 transactions. Both changes mean more people will get no paperwork at all for income that is fully taxable. The IRS gig economy guidance is blunt about this: report it whether or not a form shows up.
If you do owe during the year, you avoid an underpayment penalty by hitting a safe harbor: pay at least 90% of this year’s total tax, or 100% of last year’s total tax (110% if your prior-year AGI was above $150,000). The prior-year safe harbor is the easy one, because you already know the number.
The W-4 shortcut: skip quarterly payments if you have a day job
This next part rarely shows up in the guides, and it is the most useful thing on the page.
The Instructions for Form 2210 say that tax withheld from wages is treated as paid in four equal installments across the year by default, one-fourth on each due date, no matter when it was actually withheld. An estimated tax payment gets credited only to the quarter you made it in.
That asymmetry is the whole trick. Money you send with a 1040-ES voucher in December does nothing for the April, June and September installments you missed. Money withheld from a December paycheck is treated as though a quarter of it arrived back in April.
So if you have a W-2 job, you can cover your side hustle entirely through Step 4(c), extra withholding, on your day job’s W-4. No vouchers, no 1040-ES worksheet. And you can fix an entire year in the fourth quarter.
The math is division. Take your total set-aside and divide by the paychecks left in the year:
- In the example above, $3,659 across 26 biweekly checks is $141 per check if you start in January.
- Discover it in October with 5 checks left and the same $3,659 becomes $732 per check. Painful, but it lands as if you had paid all year.
This stops working in two situations: when side income dwarfs your salary, and when your day job does not pay enough to absorb the withholding. Then you are back to quarterly payments, due April 15, June 15 and September 15 of 2026, and January 15 of 2027 for tax year 2026.
For the mechanics of the form itself, see how to adjust your W-4 for more take-home pay. If your “side hustle” is a second W-2 job rather than 1099 work, the rules are different and W-4 withholding with two jobs is the right starting point.
Test the number before you file the form
A per-check withholding figure is easy to get wrong in a way that only surfaces in April. Check it against a real paycheck before you hand the form to HR.
That is what the Salary Calculator app from Stub44 is built for. It runs full federal, state and FICA math for all 50 states plus DC, and it has a Step 4(c) extra-withholding field, so you can type in $141 and see exactly what your net pay becomes. Saved profiles make the comparison direct: keep one called “Main job” and one called “Main job + side gig,” then read the difference.
On the web side, the W-4 withholding planner works out the Step 4(c) figure, and the W-2 vs 1099 rate calculator shows what a freelance rate is really worth after self-employment tax. If the extra income is a second paycheck instead, use the second job take-home calculator.
Do the arithmetic once, set the percentage, and then stop thinking about it. Download Salary Calculator and run your own numbers in about a minute.
Frequently Asked Questions
How much should I set aside for taxes on a side hustle?
Start at 14.13% for self-employment tax, then add your marginal federal rate applied to about 93% of net profit, then add your state rate. A single filer with a $70,000 W-2 salary lands near 30% to 35%, noticeably above the 25% rule of thumb.
Do I pay taxes on side hustle income under $400?
Yes. Income tax applies from the first dollar. The $400 threshold only decides whether you owe self-employment tax and file Schedule SE.
Do I have to make quarterly estimated payments?
Only if you expect to owe $1,000 or more at filing after withholding. If you have a W-2 job, raising Step 4(c) extra withholding on your W-4 can cover the side income instead.
Can I really skip quarterly payments by changing my W-4?
Yes. The Form 2210 instructions treat withheld tax as one-fourth paid on each installment date by default, while an estimated payment counts only for the quarter it's made. So a late-year W-4 bump is treated as if you had paid evenly all year.
Do I set aside a percentage of what I'm paid, or of my profit?
Profit. Apply the percentage to revenue minus business expenses. Applying it to gross payouts over-saves, sometimes badly.
What if I don't get a 1099 for my side hustle?
You still owe tax and still report it. For 2026 the 1099-NEC threshold rose to $2,000 and 1099-K is back to $20,000 plus more than 200 transactions, but the forms have nothing to do with whether the income is taxable.
Does my day job's salary change how much I set aside?
Substantially. Your W-2 wages set the marginal bracket the side income stacks into, and they fill the $184,500 Social Security wage base first. Past that point the 12.4% portion of self-employment tax stops.
Will I owe a penalty if I under-save?
Not if you hit a safe harbor: owe under $1,000 after withholding, or pay at least 90% of this year's tax or 100% of last year's tax (110% if your prior-year AGI topped $150,000).