How much should I set aside for side hustle taxes?

Most side hustlers should set aside 25 to 30 percent of net profit. That covers federal income tax (usually 12 to 22 percent at side-hustle income levels) plus 15.3 percent self-employment tax, minus the deduction for half of SE tax. If you live in a state with income tax, add another 3 to 7 percent. A simple heuristic: 30 percent of every dollar earned goes into a separate savings account on the day you are paid.

What is self-employment tax and why do I owe it?

Self-employment tax is the Social Security and Medicare contribution you owe as a 1099 worker. It is 15.3 percent of net profit (12.4 percent Social Security on the first $168,600 of 2025 earnings, plus 2.9 percent Medicare on everything). When you work a W-2 job your employer pays half. As a side hustler you pay both halves. This is the tax that surprises most first-time 1099 filers.

Do I have to pay quarterly estimated taxes on my side hustle?

Yes, if you expect to owe $1,000 or more in tax on your side income. The IRS wants the money throughout the year, not just at tax time. Quarterly estimated payments are due April 15, June 15, September 15, and January 15. If your W-2 withholding covers the side income (by adjusting your W-4 to withhold extra), you can skip quarterlies.

What happens if I don't pay quarterly taxes?

The IRS charges an underpayment penalty. It is calculated as an interest charge on what you should have paid each quarter. In 2025 the penalty rate is about 8 percent annualized. On $4,000 underpaid for a full year, the penalty is roughly $320. Not catastrophic, but avoidable. You also owe the full tax at filing, which means a big April bill.

Is a 1099 tax calculator accurate?

A good one (Keeper Tax, TaxAct, or IRS Form 1040-ES worksheet) is accurate to within 5 to 10 percent as long as you input realistic deductions. The main driver of inaccuracy is users forgetting to enter business expenses. You calculate tax on net profit (gross minus expenses), not gross revenue. A $15,000 side hustle with $4,000 in expenses is taxed on $11,000.

Side Hustle Taxes 101: How Much to Set Aside in 2026

You made $8,400 on Etsy this year. Or $12,000 driving for DoorDash on weekends. Or $4,800 freelancing graphic design. Fantastic. In April, the IRS sends you a tax bill for roughly $2,500 that you did not see coming, and you discover a fun new tax line called "self-employment tax" that took 15.3 cents out of every dollar before income tax even got its turn. Jackson Hewitt's 2025 survey found that 61 percent of first-time 1099 filers underestimated their tax bill. Money With Katie has been banging this drum for 4 years running.

This is the plain-English fix. What taxes actually apply, the set-aside percentage that works for 90 percent of side hustlers, the self-employment tax explained in one table, how to use a 1099 calculator without getting lost, and the 4 quarterly deadlines to put in your calendar today. By the end you will know exactly how much to move into a separate savings account every time a Venmo or Stripe payout hits.

The short answer: 25 to 30 percent

If you want the one-sentence rule: set aside 30 percent of every dollar of side hustle net profit in a separate savings account, on the day you are paid. You will have enough to cover federal income tax, self-employment tax, and most state income taxes. If you live in a no-income-tax state (TX, FL, WA, TN, NV, SD, WY, AK, NH), 25 percent is usually enough. If you live in California, NYC, Oregon, or Hawaii, use 32 to 35 percent.

The 30 percent rule is deliberately a little over. Over-saving by $300 in April is a refund. Under-saving by $300 is a penalty plus interest plus a cash crunch. The asymmetry tells you which side to err on.

What taxes actually apply to side hustle income?

Three layers, in this order:

Self-employment tax. 15.3 percent of net profit. This is the Social Security and Medicare contribution. Your W-2 employer pays half of this for you; as a side hustler, you pay both halves.
Federal income tax. Whatever marginal bracket your total income lands you in. For most side hustlers the side income gets taxed at 12 or 22 percent (your W-2 already filled the 10 percent bracket).
State income tax. 0 to 13 percent depending on state. Plus city tax in a few places (NYC, Philadelphia, some Ohio cities).

There is one offsetting deduction you get automatically: you deduct half of your self-employment tax from gross income before income tax is calculated. This is why 30 percent works out rather than 35+.

Self-employment tax in one table

Component	Rate	Applied to
Social Security	12.4%	First $168,600 of net profit (2025)
Medicare	2.9%	Every dollar of net profit
Additional Medicare	0.9%	Net profit over $200k single / $250k joint
Total SE tax	15.3%	Up to the SS cap

15.3 percent of your net profit, off the top, before income tax. If your side hustle netted $10,000 this year, SE tax alone is $1,530. Then income tax. Then state tax. Now you see why your friend who got a surprise $3,100 bill was not making it up.

Gross vs net: what you actually get taxed on

Taxes are on net profit, not gross revenue. Net profit is gross revenue minus legitimate business expenses. This is the single most important concept in side hustle taxes, and the one TikTok finance videos mangle most often.

Examples:

DoorDash driver. Gross payouts $18,000. Mileage deduction (standard IRS rate, 70 cents per mile in 2025) on 22,000 business miles = $15,400. Phone and hot bag = $400. Net profit = $2,200. You pay tax on $2,200.
Etsy seller. Gross sales $14,000. COGS $3,800, shipping $1,900, Etsy/processing fees $1,400, advertising $500. Net profit = $6,400.
Freelance designer. Gross $22,000. Software (Adobe, Figma) $720, home office deduction $1,200, internet portion $400. Net profit = $19,680.

The calculator walkthrough below uses net profit. If you enter gross, the calculator over-estimates your tax by 15 to 40 percent depending on expense load.

The 25 to 30 percent set-aside: worked examples

Example 1: DoorDash weekend driver, $8,000 net profit

SE tax: 15.3% of $8,000 = $1,224
SE tax deduction (half): $612 reduces AGI
Federal income tax on the net (at 22% marginal, assuming full-time W-2 day job): ($8,000 - $612) x 22% = $1,625
State tax (at 5%): $370
Total tax: $3,219 (40 percent of profit)

This person should set aside 35 percent, not 30. The 22 percent bracket pushes them up. If they are in the 12 percent bracket instead, set-aside drops to 26 percent.

Example 2: Etsy seller, $6,400 net profit, 12 percent bracket

SE tax: $979
Federal income tax: ($6,400 - $490) x 12% = $709
State tax (at 5%): $295
Total tax: $1,983 (31 percent of profit)

30 percent set-aside lands exactly right here.

Example 3: Freelance designer, $19,680 net profit, 22 percent bracket

SE tax: $3,011
Federal income tax: ($19,680 - $1,506) x 22% = $3,998
State tax (at 5%): $923
Total tax: $7,932 (40 percent of profit)

This person in a 22 percent bracket should set aside 35 to 40 percent, not 30. If tax planning matters at this income level, consider an S-corp election or a solo 401k to lower total tax.

Quarterly estimated taxes: the 4 deadlines

If you will owe more than $1,000 on your side hustle (covers most people earning more than $4,000 in net profit), the IRS wants the money quarterly, not at April 15. The deadlines:

Quarter	Covers income from	Payment due
Q1	Jan 1 - Mar 31	April 15
Q2	Apr 1 - May 31	June 15
Q3	Jun 1 - Aug 31	September 15
Q4	Sep 1 - Dec 31	January 15 (following year)

Yes, Q2 is weird (only 2 months). Yes, Q4 due date is in the next year. Yes, this is how the IRS has always done it. Put all 4 dates in your calendar today with a reminder 5 days before each.

Pay at IRS.gov/payments via Direct Pay (free, bank draft). Most states have a parallel portal. If you prefer paper, IRS Form 1040-ES includes vouchers.

Keep a quarterly rhythm: at the end of each quarter, total your net profit for the quarter, multiply by your set-aside rate, and pay that amount. You do not have to calculate your annual tax liability every quarter. The IRS only expects reasonable progress payments.

The W-4 alternative: avoiding quarterlies

If you have a W-2 day job in addition to your side hustle, you can skip the quarterly payments by over-withholding on your W-2. Go to your HR and file a new W-4. On line 4(c) (extra withholding per paycheck), add enough to cover your side hustle tax.

Math: estimated annual side hustle tax ÷ number of pay periods = extra per paycheck. If you owe an estimated $2,400 on your side income and get paid biweekly (26 periods), add $92 per paycheck to line 4(c). No quarterly payments, no penalty risk, no separate IRS portal.

This is the cleanest path for most part-time side hustlers. Money With Katie has been recommending it since 2022. Our guide on how to fill out a W-4 form covers the full workflow.

How to use a 1099 tax calculator

Three free ones worth using in 2026:

Keeper Tax 1099 calculator. Cleanest UI. Asks for your gross, expenses, W-2 income, and state. Returns estimated quarterly payment and annual liability.
TaxAct self-employment tax calculator. Good for a second opinion.
IRS Form 1040-ES worksheet. The official one. Clunky but 100 percent accurate. Use this when your numbers are weird (big expense year, multiple 1099s, etc.).

The inputs every calculator wants:

Expected gross revenue from the side hustle this year
Expected business expenses (be honest, use last year as a baseline)
W-2 income, if any
W-2 tax already withheld, if any
Filing status (single, married, HoH)
State

Output: a quarterly estimated payment number. Use that as your set-aside target, divided evenly across the 4 deadlines, or all at once into a tax savings account.

The tax savings account: where to park the 30 percent

Open a separate HYSA labeled "Taxes" (or "IRS" if you want the stomach drop). Ally, Capital One 360, and Marcus all let you name sub-accounts. Every time a Stripe, PayPal, Etsy, DoorDash, or client payout hits your checking, immediately move 30 percent to the tax sub-account. Set this up as a weekly or monthly habit.

Bonus: the HYSA earns 4 to 5 percent interest on the money while it sits. On a $3,000 tax balance across a year, that is $120 to $150 in free money for doing what the IRS required you to do anyway.

This is the same logic as a sinking fund. Our guide on sinking funds explained covers the full mechanic, which is "put monthly chunks aside for a known future bill."

Deductions that side hustlers routinely miss

Mileage. 70 cents per business mile in 2025. This is huge for gig drivers. Keep a log.
Home office. Simplified method: $5 per sq ft up to 300 sq ft = $1,500 max deduction. The space has to be used regularly and exclusively for business.
Phone portion. If you use your phone for the side hustle, deduct the business percentage of the bill. 40 percent is a defensible number for most gig workers.
Software subscriptions. Adobe, Figma, Canva Pro, Notion, Zoom, bookkeeping app. All deductible.
Education. Courses, conferences, books directly related to the hustle.
Professional services. Accountant, bookkeeper, tax prep fees for the business portion of your return.
Startup expenses. Up to $5,000 of launch costs in year one.
Platform fees. Etsy fees, Stripe fees, Shopify, marketplace commissions. All deductible.

Jackson Hewitt's 2025 side hustler audit found that the average 1099 filer missed $1,400 in legitimate deductions on their return. Track expenses monthly, not at tax time.

The 1099-K threshold confusion

One more thing Money With Katie keeps hammering. The IRS has been rolling out a lower 1099-K threshold. For tax year 2025, the threshold is $2,500 in platform payments (Venmo, PayPal, Stripe, Etsy). For tax year 2026, it drops to $600. This does not change what you owe. You always owed tax on side hustle income. It changes whether the IRS gets a form with your name on it.

In practice: you will get more 1099-K forms in the mail than ever before, and the IRS will match them against your return. Under-reporting is easier to catch. Track every dollar, report every dollar, claim every deduction.

What to do this week

Run a 1099 calculator with your year-to-date numbers. Get a quarterly estimate.
Open a separate HYSA labeled "Taxes."
Set up a weekly transfer of 30 percent of side hustle payouts into that account.
Put the 4 quarterly dates (April 15, June 15, September 15, January 15) in your calendar with reminders.
If you have a W-2 job, consider adjusting your W-4 to over-withhold and skip quarterlies entirely.
Start a monthly expense log with categories: supplies, mileage, home office, software, fees.

If you want a pre-built tracker with income, expenses, mileage, and auto-calculating quarterly estimates, the Side Hustle Tax Tracker is $14. For the free starter kit, the Quarterly Tax Reminder Calendar covers the four dates on printable cards.

Your future April self will either thank you or curse you depending on what you do in the next 30 days. A $3,000 tax bill you saved for is fine. A $3,000 surprise is a financial crisis. The difference is 30 percent of every payout, every time, starting now.