Budgeting for Self-Employment Taxes Like a Bill
Self-employment tax is 15.3% of 92.35% of net profit. Derive your own withholding percentage, hold it back per payment, and fund the four due dates.
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This is general information, not tax advice. Rules change, state treatment varies, and your situation has details no article can see. Run anything here past a CPA or an enrolled agent before you act on it.
Your income arrives gross, and part of it was never yours
An employee’s paycheck arrives pre-shrunk. Payroll pulls federal income tax, Social Security and Medicare before the deposit lands, so “what I earned” and “what I can spend” are roughly the same number. That convenience hides a whole tax system.
Freelance income does not work that way. A client pays the full invoice, it clears, and your balance goes up by the entire amount. Nothing was withheld because nobody was there to withhold it. The obligation still exists. It is just sitting in your checking account with your name on it.
Two separate taxes are waiting for that money, and confusing them is where most first-year freelancers go wrong.
Self-employment tax is the one that ambushes people. It covers Social Security and Medicare, both halves, the employee’s and the employer’s, because you are both. The combined rate is 15.3 percent (12.4 percent Social Security plus 2.9 percent Medicare), and it applies to 92.35 percent of your net earnings from self-employment. It starts once net earnings reach 400 dollars, which is a very low bar.
Federal income tax is the second, and it behaves the way you already expect: standard deduction, brackets, the usual machinery.
Budget for your income-tax bracket alone and you come up short by roughly the entire self-employment tax. That is the classic shape of the April surprise: someone felt responsible, set aside 12 percent because that felt like their bracket, and needed more than 20.
Two ceilings are worth knowing. The 12.4 percent Social Security portion stops once your earnings for the year reach the wage base of 184,500 dollars. The 2.9 percent Medicare portion has no ceiling at all, and an additional 0.9 percent applies above 200,000 dollars for a single filer or 250,000 dollars for a married couple filing jointly.
How much of each payment to hold back, derived
Every article on this subject says “set aside 25 to 30 percent,” and almost none of them show where the number comes from, which leaves you no way to tell whether it fits your situation. The arithmetic, end to end, runs like this.
Take a single filer, sole proprietor, with 60,000 dollars of net profit for the year. Net profit means revenue minus business expenses, not revenue. Standard deduction, no state income tax, and no qualified business income deduction claimed.
| Step | Calculation | Result |
|---|---|---|
| Net earnings from self-employment | $60,000 x 92.35% | $55,410.00 |
| Self-employment tax | $55,410.00 x 15.3% | $8,477.73 |
| Deductible half of SE tax | $8,477.73 / 2 | $4,238.87 |
| Adjusted gross income | $60,000 - $4,238.87 | $55,761.13 |
| Taxable income | $55,761.13 - $16,100 standard deduction | $39,661.13 |
| Income tax | $1,240 (10% on the first $12,400) + 12% x $27,261.13 | $4,511.34 |
| Total federal tax | $8,477.73 + $4,511.34 | $12,989.07 |
| Share of net profit | $12,989.07 / $60,000 | about 21.6% |
Three things about that 21.6 percent.
First, it is deliberately conservative. The qualified business income deduction was left out, and it only ever lowers the bill. A sole proprietor under the income threshold of 201,750 dollars (single or head of household) can usually claim it, which pushes the real number below 21.6 percent.
Second, no state income tax is in there. That single omission is most of the gap between 21.6 percent and the folk rule. Depending on where you live, state tax adds anywhere from nothing to another several points.
Third, the 25 to 30 percent rule is normally quoted against gross receipts, not net profit. If you have real business expenses, applying 30 percent to every dollar that arrives builds in a second cushion on top of the first, because the taxable base is smaller than the receipts base.
The rule of thumb is padded rather than wrong, and you now know exactly what the padding is covering.
Your decision rule. In year one, with no filed return to lean on, hold back 30 percent of every payment that arrives. It will be too much. Being too far ahead in April is a good problem. After your first full year as a freelancer, take your actual total tax divided by your actual gross receipts, add a couple of points, and use that as your personal withholding percentage going forward. That figure beats any rule of thumb, because it is derived from your own expenses, your own state and your own filing status.
This example produces 12,989.07 dollars of federal tax, which under the default equal-quarters split is about 3,247 dollars per installment. That is the number you are funding.
Move it the day the money clears
Knowing the percentage is the easy half. The harder half is when you move it.
A percentage you calculate at the end of the month is a percentage you have already spent. Money sitting in a spendable balance gets spent through ordinary arithmetic rather than recklessness: you looked at the balance, it said 6,400 dollars, and you made decisions against 6,400 dollars.
The fix is to make the transfer part of the invoice-paid ritual, on the same day, before you do anything else with the money.
- Pick the destination before your first invoice. A separate account you have no card attached to. Interest-bearing if you can manage it, because the money sits there for months.
- Round up, never down. If the calculation says 847 dollars, move 850. The rounding costs nothing and quietly builds a buffer.
- Never treat the reserve as available cash. If you genuinely have to borrow from it to cover a gap, write down the repayment date in the same minute you take the money. An undated loan to yourself is a withdrawal.
- Do not net it against expenses. Set aside on the full payment received, and let your expense deductions show up as an over-reserve at filing time.
Recording the flow correctly matters more than it sounds. Money going into the tax reserve is a transfer, not an expense: it moved between two accounts you own and your total position is unchanged. It only becomes an expense when the IRS actually takes it. Our post on transfers vs expenses in your budget works through why blurring those two wrecks a month’s numbers.
In Budget44 that maps cleanly. Create an asset account called “Tax reserve” and switch off its include-in-total toggle, so the balance stops inflating your net worth. That toggle is doing real conceptual work here: a tax reserve is a liability wearing an asset’s clothes, and a net worth figure that counts money you owe the IRS is telling you a comfortable lie. When an invoice clears you record the payment as income to your operating account, then a transfer of your withholding percentage into the reserve. At each due date you record an expense against the reserve account.
To be plain about what the app does and does not do: Budget44 does not calculate self-employment tax, does not connect to a bank, does not move money and does not file anything. You do the arithmetic and record the transfer. It is a manual, on-device ledger, which is exactly the point for a lot of freelancers who would rather not hand their tax reserve balance to a third-party service. Amounts are stored as integer minor units, so the reserve total stays exact to the cent instead of drifting on rounding.
The four due dates are bills, so schedule them like bills
The IRS does not wait until April. Estimated tax is a pay-as-you-go system, and the year is split into four payment periods.
| Income period | Payment due |
|---|---|
| January 1 to March 31, 2026 | April 15, 2026 |
| April 1 to May 31, 2026 | June 15, 2026 |
| June 1 to August 31, 2026 | September 15, 2026 |
| September 1 to December 31, 2026 | January 15, 2027 |
These are not equal calendar quarters. The second period covers two months and the third covers three. “Quarterly” is a misnomer: the June payment lands only two months after the April one, so the reserve has had a third less time to refill, and anyone assuming a clean three-month gap gets caught.
The shift rule is worth memorizing so you can carry the habit into future years: if a due date falls on a Saturday, Sunday or legal holiday, the payment is on time if you make it on the next day that is not one of those. Publication 509 is the authoritative calendar, and it is worth checking rather than trusting a secondary source. Several widely-syndicated articles currently list the second installment as June 16, which is wrong.
Who has to pay. Generally, anyone expecting to owe at least 1,000 dollars in federal tax for the year after subtracting withholding and refundable credits. If you also have a W-2 job, increasing the withholding on that job is a legitimate substitute for quarterly payments, and often an easier one, because withholding is treated as paid evenly across the year regardless of when it actually happened.
The safe harbor. You avoid the underpayment penalty if you pay either 90 percent of the current year’s tax, or 100 percent of the tax shown on your prior-year return. That second track rises to 110 percent if your prior-year adjusted gross income exceeded 150,000 dollars. The prior-year track is the useful one for freelancers, because it is a known, fixed number you can divide by four as soon as your return is filed and then stop thinking about, no matter how the year turns out.
Meeting a safe harbor prevents the penalty, not the tax. If you had a huge year and paid 100 percent of last year’s much smaller liability, you are protected from the penalty and you still owe the entire remaining balance on filing day. Plan for that gap or the safe harbor becomes a trap.
If you miss one. The charge is interest on the shortfall from the due date, compounded daily, at a rate the IRS resets each quarter (recently running around 6 to 7 percent annually). Because it is interest rather than a flat fine, a late payment costs strictly less than a skipped one. Send what you have as soon as you have it.
The practical move is to put all four dates on your calendar as scheduled outflows the moment you know them, so April 15 becomes a line item you have been funding for months rather than an event that happens to you. Budget44 has no quarterly cadence, so this is four separate yearly recurring expense templates, one per date. The free tier caps how many recurring items you can hold; the subscription lifts that cap. Once they exist, they show up on the calendar as projected activity until you actually pay them, which is the same projected versus recorded distinction that keeps a forecast from being mistaken for a fact.
When your income is lumpy
Freelance years are rarely flat. A fat first quarter and a thin fourth is normal, and the default equal-quarters split handles it badly: you overpay in the lean period and underpay in the fat one.
The percentage-per-payment method already solves most of this. A reserve sized as a share of what actually arrived scales itself. Nothing arrives in a dead month, so nothing gets set aside, and the reserve does not demand money you do not have. A fixed monthly transfer cannot do that.
If you prefer a flat monthly transfer for the routine of it, size it against your floor income, not your average. Average-based transfers fail in exactly the months you can least afford them to.
For the installments themselves, the IRS provides a genuine remedy: the annualized income installment method, on Schedule AI of Form 2210. It lets you compute each installment based on the income you actually earned through that point in the year, instead of assuming an even split. If you earned most of your money in the autumn, this is how you avoid a penalty for not having paid it in April. The paperwork is real, so it is worth doing when your year is genuinely uneven and not worth it when it is roughly level.
The wider problem here is budgeting an income that varies at all, and the tax reserve is only one piece of it. Our irregular income budget calculator helps you find the floor number to build a month around, and the same sinking-fund logic covers everything else that arrives in lumps. A quarterly tax bill is a sinking fund for an irregular bill with the unusual property that the due date is set by statute and does not negotiate.
Deductions, and the reserve you get to release
Everything above reserves against a number that is probably larger than what you will owe. That is by design, and it is worth understanding which levers shrink the real bill.
Business expenses reduce net profit, which is the base for both self-employment tax and income tax. This is the strongest lever on the list, because it lowers the bill twice.
You also get to deduct half of your self-employment tax above the line. It is already in the worked example above, but it surprises people that the deduction exists at all.
The qualified business income deduction reduces taxable income, not self-employment tax. Under the threshold (201,750 dollars for single and head of household filers, 403,500 dollars for married filing jointly), a sole proprietor can generally take it without the complications that apply above that line.
On the retirement side, contributions reduce income tax but not self-employment tax. A SEP-IRA allows a contribution of up to 72,000 dollars depending on your earnings, which makes it the largest single tax-planning lever available to a profitable freelancer.
Reserve at 30 percent, owe closer to 22, and you finish the year holding a surplus. Do not spend it. The obvious use is to leave it in place as the funding for the following January’s installment, which is the one that always arrives during the leanest, least billable stretch of the year. A reserve that rolls forward works as a buffer rather than a savings account, and after two or three years of that you stop dreading April entirely.
That is the whole system: a fixed percentage, moved the day the money clears, into an account you do not spend from, against four dates already sitting on the calendar. If you want somewhere private and offline to run it, download Budget44 and set up the reserve account before your next invoice clears.
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Frequently Asked Questions
How much should I set aside for self-employment taxes?
Federal tax alone lands near 21 to 22 percent of net profit for a single filer at a moderate income, so the familiar 25 to 30 percent of each payment received covers federal plus most state situations with a cushion left over. If you are in your first year with no filed return to calibrate against, start at 30 percent of every payment and adjust downward only after you have seen a real tax bill.
When are quarterly estimated taxes due?
For the 2026 tax year the four installments are due April 15 2026, June 15 2026, September 15 2026 and January 15 2027. If a due date falls on a Saturday, Sunday or legal holiday, the payment is on time if you make it on the next business day. IRS Publication 509 is the authoritative calendar.
Do I have to pay quarterly taxes if I only freelance part-time?
You generally need to make estimated payments if you expect to owe at least 1,000 dollars in federal tax for the year after subtracting withholding and refundable credits. Self-employment tax itself applies separately once your net earnings from self-employment reach 400 dollars. If you also hold a W-2 job, raising the withholding on that job is a legitimate alternative to writing quarterly checks.
What is the self-employment tax rate?
15.3 percent, made up of 12.4 percent for Social Security and 2.9 percent for Medicare, applied to 92.35 percent of your net earnings from self-employment. The 12.4 percent portion stops at the Social Security wage base of 184,500 dollars. The Medicare portion has no cap, and an extra 0.9 percent applies above 200,000 dollars for a single filer or 250,000 dollars for a married couple filing jointly.
What happens if I miss a quarterly payment?
The IRS charges underpayment interest on the shortfall from the due date, compounded daily, at a rate it resets every quarter and which has run roughly 6 to 7 percent annually. It is interest rather than a flat fine, so paying late costs less than not paying at all. Send what you can as soon as you can, and file Form 2210 if your income was uneven across the year.
Where should I keep the money I set aside for taxes?
In a separate account you never spend from, ideally one that earns interest. In a budgeting app, hold it as its own account and exclude it from your net worth total, because that balance is owed rather than owned. Mixing the reserve into your everyday checking balance is the single most common way it gets spent.
How do I budget for taxes when my income is different every month?
Withhold a fixed percentage of every payment instead of moving a fixed monthly amount, so the reserve scales with what actually arrived. If your year is heavily front-loaded or back-loaded, the annualized income installment method on Form 2210 Schedule AI lets you size each installment to the income you actually earned in that period rather than splitting the year into four equal pieces.