Most freelancers hear the same number from every blog and bookkeeper: set aside 25-30%. Almost none of them explain where that number comes from, which means almost none of them can tell you when it stops working. The real math has two separate pieces, and one of them changes depending on how much you make.
A client of mine saved exactly 30% of every invoice for two years straight, like clockwork. Then his income jumped 40% in one year and the IRS sent a bill for $2,100 he hadn't budgeted for. The percentage that worked at $35,000 stopped working at $65,000. He found out the hard way that the rate moves.
What's the Formula for Self-Employment Taxes?
The 25-30% range comes from two different taxes stacked on top of each other: a fixed 15.3% self-employment tax and a variable federal income tax that depends on your bracket. The self-employment tax doesn't change based on income level. The income tax portion does, which is why a flat percentage breaks down as your earnings grow.
Self-employment tax covers Social Security and Medicare, the same taxes an employer would split with you on a W-2 job. Since you're both the employer and the employee here, you pay both halves: 12.4% for Social Security and 2.9% for Medicare, for a combined 15.3%. The IRS only taxes 92.35% of your net profit for this calculation, not the full amount, so the math looks like this on $60,000 in net profit: $60,000 × 0.9235 = $55,410. That's your taxable self-employment earnings. Multiply by 15.3% and you get $8,477 in self-employment tax, before income tax even enters the picture.
Income tax sits on top of that, calculated using your 2026 federal tax brackets after deductions. A single filer gets a $16,100 standard deduction in 2026, plus a qualified business income deduction worth up to 20% of net profit. Stack those together and the taxable income left over often lands in the 12% or 22% bracket for a typical freelancer's income range. That bracket, not the flat self-employment rate, is the part that shifts as you earn more.
Does the Tax Percentage Apply to Gross Income or Net Profit?
The percentage applies to net profit after business deductions, not to every dollar a client pays you. Freelancers confuse this more than any other point in tax planning, and it costs money in both directions: some oversave on income they never owe tax on, others undersave because they forget deductions exist at all.
Say you invoice $80,000 for the year. If you spend $15,000 on software, a home office deduction, mileage, and a laptop, your net profit is $65,000. Self-employment tax and income tax both get calculated on that $65,000, not the $80,000 you collected. A freelancer who sets aside 30% of gross revenue without tracking expenses is often setting aside more than they need, sometimes by thousands of dollars.
This works against you too if you ignore deductions you're entitled to. Schedule C (Form 1040) lists the categories: supplies, software subscriptions, a portion of your phone bill, vehicle expenses, and retirement contributions through a SEP-IRA or Solo 401(k). Every dollar of legitimate deduction lowers the base your taxes get calculated on. Track expenses sloppily and you're not just risking an audit, you're paying tax on income you didn't keep.
Is 30% Enough to Save for Taxes as a 1099 Worker?
Thirty percent works as a starting point for moderate income levels, but it stops being accurate once your net profit climbs past $80,000 or your income jumps from one year to the next. The effective tax rate on self-employment income isn't flat. It rises as profit increases, because the self-employment tax portion stays fixed while the income tax bracket climbs.
The math moves like this: at $20,000 in net profit, the combined federal tax comes to about 15% of profit. At $48,000, it's around 19%. At $100,000, it's closer to 22%. At $150,000, you're past 25%. A freelancer using a flat 30% at $20,000 in profit is oversaving by hundreds of dollars. A freelancer using 25% at $150,000 is undersaving by thousands, and won't find out until the IRS sends the bill.
State income tax adds another variable the 25-30% range never accounts for. Some states charge nothing on earned income. Others charge well into the double digits combined with federal rates. Check your specific state's current rate before finalizing a number, because the federal math alone won't tell you the full amount to set aside.
There's also the year you can't predict from a formula: the year your biggest client pays late and lands two invoices in the same quarter, or the year you land a contract that doubles your income. The IRS doesn't average your income across the year for safe harbor purposes. It looks at what you earned and what you paid in, on the schedule the IRS sets.
How Much Should I Set Aside If I Make $4,000 a Month?
A freelancer netting $4,000 a month, or $48,000 a year in profit, should plan to set aside about $772 a month, or 19.3% of net profit, to cover both self-employment tax and federal income tax. That number assumes no other income, the standard deduction, and a single filing status. Run your own numbers if your situation differs.
$48,000/year net profit$48,000 × 0.9235 = $44,328$44,328 × 0.153 = $6,782 SE tax$2,489$9,271 → $772/monthMultiply your monthly net profit by 0.9235, then by 0.153, and you have your self-employment tax. Subtract half of that figure along with your standard deduction and QBI deduction from your income, run what's left through the 2026 tax brackets, and you have your income tax. Add the two together and divide by twelve.
Most freelancers skip this calculation and guess instead. That guess is how someone ends up short $1,500 in April with no idea why. A dedicated savings account that holds this money untouched, separate from your checking account, removes the temptation to spend it before the IRS asks for it.
High-yield savings account built for holding tax reserves separately from spending money.
Do I Have to Pay Taxes If I Make Less Than $5,000 as a 1099 Worker?
Yes. The IRS threshold for self-employment tax is $400 in net earnings, not $5,000, and that figure has circulated online for years without correction. A freelancer earning $1,200 from a single client owes self-employment tax. A freelancer earning $4,000 across five different clients owes it too, even though no single 1099 form reflects the full amount.
The $5,000 figure people repeat likely comes from a different rule: payment platforms aren't required to send a Form 1099-K unless your transactions exceed certain thresholds, which have shifted in recent years. That reporting threshold determines when a third-party platform has to tell the IRS about your income. It has nothing to do with whether you owe tax on it. You owe tax on income whether or not anyone sends you a form documenting it.
The math on the threshold: net profit multiplied by 92.35% has to reach $400 before self-employment tax kicks in. That works out to about $433 in net profit, not $5,000, not $600, not the figure on whatever 1099 form did or didn't arrive in your inbox. Below $433 in net profit, you likely owe nothing in self-employment tax. Above it, you have a filing requirement even if your income tax liability ends up at zero.
How Do You Calculate the 15.3% Self-Employment Tax?
Multiply your net profit by 92.35%, then multiply that result by 15.3%. The 92.35% accounts for the fact that an employee's share of payroll tax would be calculated on a lower base, and the IRS extends that same adjustment to self-employed taxpayers doing the equivalent calculation.
On $50,000 in net profit: $50,000 × 0.9235 = $46,175. Multiply that by 0.153 and the self-employment tax comes to $7,065. That figure splits into two pieces on Schedule SE: 12.4% for Social Security, capped at $184,500 in combined wages and self-employment earnings for 2026, and 2.9% for Medicare, which has no cap at all. Most freelancers never approach the Social Security cap, so the simplified math above covers almost every case.
Half of whatever you calculate here becomes a deduction on Schedule 1, line 15, which lowers your adjusted gross income before income tax gets calculated. Skip that deduction and you'll overpay. The IRS built it into the form because the two taxes are supposed to interact this way, not as a bonus you have to ask for.
Set aside the percentage your income level requires, not the number a blog post repeated from a decade-old estimate. The IRS doesn't bill you for what you should have saved. It bills you for what you owe, with interest attached if you guessed wrong.