If you're newly self-employed and panicking about a surprise tax bill, here's the short answer: set aside 25-30% of your net profit (what's left after business expenses), and move it into a separate savings account every time you get paid. For most side-hustlers earning under six figures in a no-income-tax state, 25% is plenty; if you're in a high-tax state like California or New York, or your income is climbing, lean toward 30-35%.

That single habit — skimming a percentage off every payment into a "tax" account — is what separates people who calmly write a check at tax time from people who get blindsided by a $6,000 bill they can't pay.

The Simple Rule: 25-30% of Net Profit (Not Gross)

The most important detail almost every guide glosses over: you set aside a percentage of your net profit, not your gross revenue.

  • Gross revenue = everything clients paid you.
  • Net profit = gross revenue minus your legitimate business expenses (software, mileage, supplies, a portion of your phone, etc.).

You only owe tax on the profit. So if you invoiced $60,000 but had $15,000 in real business expenses, your tax is calculated on $45,000, not $60,000.

Quick rule: Profit × 25-30% = the amount to bank for taxes.

Why that range? It bundles two separate taxes into one easy number:

  1. Self-employment (SE) tax — 15.3%. This covers Social Security (12.4%) and Medicare (2.9%). As an employee, your boss quietly paid half of this for you. Now you pay both halves. This is the part that shocks people.
  2. Federal income tax — roughly 10-24% for most side-hustlers, depending on your bracket and other income.

Add a slice of SE tax to a modest income-tax bracket and you land in the mid-20s to low-30s as a percentage of profit. That's where the 25-30% rule comes from — it's not magic, it's just math rounded into something you can actually use.

For the official breakdown, the IRS explains the self-employment tax rate and who owes it on the IRS self-employment tax page.

Worked Examples (So You Can Copy the Math)

Numbers make this real. These are simplified illustrations — not exact tax returns — but they show the shape of what you'll owe. (SE tax gets a small deduction in the real calculation, which is one reason a flat 25-30% gives you a comfortable buffer.)

Example 1 — The weekend side-hustler. You make $1,000/month from freelance design on top of a W-2 job. That's $12,000/year in profit. Set aside 25% and you bank $3,000. Because your day job already withholds income tax, the big new cost here is SE tax (~$1,700), so 25% leaves you a cushion.

Example 2 — The full-time freelancer. Gross $70,000, expenses $10,000, so net profit $60,000. Set aside 28% = $16,800. Realistically you'll owe SE tax (~$8,500) plus federal income tax in the 12-22% bracket. 28% covers it with a little left over.

Example 3 — The high earner. Net profit $150,000 in California. The generic "25%" is dangerous here — you're in higher federal brackets and paying state income tax. Set aside 35% = $52,500. Better to over-save and get a refund than scramble.

How Much to Set Aside by Income Level

A one-size rule is fine to start, but the right percentage genuinely shifts as you earn more (higher brackets) and depends on your state. Use this as a tiered starting point, then adjust.

Annual net profit No state income tax (TX, FL, WA, etc.) High state income tax (CA, NY, etc.)
Under $30,000 20-25% 25-30%
$30,000-$75,000 25-30% 30-35%
$75,000-$150,000 28-32% 32-38%
$150,000+ 30-35% 35-40%

Two notes on the high end: Social Security tax (the 12.4% chunk) only applies up to the wage base — $184,500 in 2026 — so past that, your marginal SE tax drops to just the 2.9% Medicare portion. But higher earners also hit higher income-tax brackets, which is why the set-aside percentage still climbs. If your income jumps a lot, that's the time to talk to a tax pro rather than rely on a blog table.

The System: Transfer on Every Single Payment

The percentage is useless without a system. Do not "save up" at the end of the year — the money will be gone. Instead, automate this:

  1. Open a separate savings account labeled "Taxes." A free business or personal high-yield savings account works; many pay interest while the money sits. (See our guide to the best free business bank account for startups.)
  2. Pick your percentage from the table above.
  3. Transfer the moment money lands. Client pays you $2,000 → immediately move $560 (28%) to the Taxes account. Treat the rest as your real, spendable income.
  4. Never touch the Taxes account except to pay the IRS (and your state).

This solves the feast-or-famine problem freelancers face. You're not guessing what to set aside in a big month versus a dead month — you just skim the same percentage off whatever comes in. Busy months automatically save more; slow months save less.

Copy-paste tax-account rule

EVERY time a client payment hits my account:
1. Multiply the payment by ___% (my set-aside rate)
2. Transfer that amount to my "Taxes" savings account today
3. The remainder is my income — I can spend/pay myself from it
4. Taxes account is OFF LIMITS until I pay the IRS + state

Tape it above your desk. The whole point is to remove the daily decision.

Don't Forget: The IRS Wants This Quarterly

Setting money aside is only half the job. If you'll owe $1,000 or more in tax for the year, the IRS expects you to pay quarterly estimated taxes — four times a year, not in one lump in April. Skip them and you can owe an underpayment penalty (it works like interest on the tax you didn't pay on time).

The 2026 federal due dates are roughly April 15, June 15, September 15, and the following January 15. A clean approach: each quarter, send the IRS what's in your Taxes account (or your calculated estimate). We walk through the exact forms and how to calculate each payment in quarterly estimated taxes for beginners.

Like practical money systems like this? Subscribe to our newsletter for one no-fluff small-business tip each week.

Lower the Number: Deductions Shrink What You Owe

Remember, you're taxed on profit, so every legitimate business expense you track reduces both your SE tax and your income tax. A freelancer who tracks $12,000 in real deductions can knock thousands off the bill versus one who tracks nothing.

Common write-offs side-hustlers miss: home-office space, mileage, software subscriptions, a percentage of your phone and internet, professional courses, and payment-processing fees. See our full list in self-employed tax write-offs and deductions.

The catch: deductions only count if you can prove them. That means keeping clean records all year, not reconstructing them in a panic each April. If your books are a mess, start with bookkeeping for beginners for solo business owners — even a simple spreadsheet beats nothing.

Quick Self-Employed Tax Checklist

  • [ ] Open a separate "Taxes" savings account
  • [ ] Pick your set-aside rate (25% baseline; 30-35% if high income or high-tax state)
  • [ ] Transfer that % to the Taxes account on every payment
  • [ ] Track all business expenses to lower your profit (and your tax)
  • [ ] Pay quarterly estimated taxes if you'll owe $1,000+
  • [ ] Add a buffer for state tax if your state has income tax
  • [ ] Reconcile after your first year and adjust the % up or down

Frequently Asked Questions

Do I set aside a percentage of gross or net income?

Net profit — gross revenue minus your business expenses. You're only taxed on what you keep, so applying 25-30% to gross would dramatically over-save (which is safe, but inefficient). Track expenses, calculate profit, then apply your percentage.

What happens if I don't pay quarterly estimated taxes?

If you owe $1,000 or more for the year and didn't pay enough during the year, the IRS charges an underpayment penalty that works like interest on the unpaid amount. It's usually not huge for small balances, but it's avoidable. The fix is simply making the four quarterly payments — see the IRS estimated taxes page for current rules and methods.

How do taxes work if I also have a W-2 job?

Your employer already withholds income tax from your paycheck, so the main new cost on your side income is the 15.3% self-employment tax plus income tax on the side profit. A 25% set-aside on side-hustle profit is usually a safe default. You can also ask your W-2 employer to withhold extra (via a new Form W-4) instead of making quarterly payments — many people find that simpler.

Should I really use a separate bank account?

Yes — it's the single highest-leverage habit here. Mixing tax money with spending money guarantees you'll spend it. A separate, labeled account turns "money I owe the government" into a visible, untouchable balance. Bonus: a high-yield savings account earns a little interest while you hold it.

Does the percentage change as my income grows?

Yes. As profit rises you move into higher income-tax brackets, so your set-aside should creep up — roughly from the mid-20s for modest earners toward the mid-30s for high earners. The 12.4% Social Security portion of SE tax stops applying above the 2026 wage base of $184,500, but higher brackets more than offset that for most people. Re-check your percentage every year, or after any big income jump.

The one thing to remember: open a separate Taxes account today and move 25-30% of every payment into it. Get that habit running first — you can fine-tune the exact percentage once you see your real numbers. None of this is personal tax advice; when your income gets serious, a one-time session with a CPA pays for itself.