Self-Employed Tax Calculator: How Much Should I Set Aside Each Quarter?
The Quarterly Tax Bill That Surprises Nobody Who Planned for It
Self-employment taxes are not complicated. They feel complicated because nobody withholds them for you — which means the responsibility of calculating, reserving, and paying them falls entirely on you, four times a year. Miss a payment or underpay and you owe a penalty. Overpay and you've given the IRS an interest-free loan.
The fix is simple: know your number. Here's how to calculate exactly how much to set aside each quarter in 2026.
The Two Taxes Self-Employed People Pay
Self-employment tax (SE tax) — Social Security (12.4%) and Medicare (2.9%) combined, totaling 15.3% of net self-employment income. Employees split this with their employer — each pays 7.65%. Self-employed people pay the full 15.3%. You do get to deduct half of SE tax from your gross income, which reduces your income tax bill slightly.
Federal income tax — based on your total taxable income (net profit minus the SE tax deduction and any other deductions). Your effective rate depends on your total income and filing status.
State income tax — varies by state. Zero in Texas, Florida, Nevada, and a few others. Up to 13.3% in California. Know your state's rate before calculating your reserve.
2026 Self-Employment Tax Quick Reference
| Tax | Rate | Applies To |
|---|---|---|
| SE Tax (Social Security) | 12.4% | Net profit up to $176,100 |
| SE Tax (Medicare) | 2.9% | All net profit |
| Additional Medicare Tax | 0.9% | Net profit above $200,000 |
| Federal Income Tax | 10–37% | Taxable income (bracket-based) |
The Quick Calculation
For most self-employed people, setting aside 25–30% of net profit covers all three taxes. Here's the breakdown for someone with $5,000/month in net profit:
- SE tax: $5,000 × 15.3% = $765 (but you deduct half, so effective ~$700)
- Federal income tax (22% bracket after deductions): ~$800
- State income tax (varies): ~$250
- Total: ~$1,750/month = 35% of net profit
The 25% rule works for lower income levels and states with no income tax. The 30–35% rule is safer for higher earners and high-tax states. When in doubt, set aside more — you'll get a refund if you overpay, but you'll pay a penalty if you underpay.
To track your net profit accurately so this calculation is always current, see Freelance Income Tracker: How to Actually Know If Your Business Is Profitable.
2026 Quarterly Estimated Tax Due Dates
- Q1 (Jan–Mar): Due April 15, 2026
- Q2 (Apr–May): Due June 16, 2026
- Q3 (Jun–Aug): Due September 15, 2026
- Q4 (Sep–Dec): Due January 15, 2027
Note: Q2 covers only 2 months, not 3. This trips up a lot of first-year freelancers who underpay the June payment.
The Safe Harbor Rule
If you pay at least 100% of last year's tax liability in estimated payments (110% if your prior year AGI exceeded $150,000), you avoid underpayment penalties — even if you end up owing more at filing. This is the "safe harbor" rule. If your income is growing year over year, this is a useful backstop that eliminates penalty risk entirely.
The Reserve Account System
The most reliable system: open a separate savings account labeled "Tax Reserve." Every time you receive payment, transfer your tax percentage immediately — before you see it in your operating account. When quarterly payments are due, the money is already there. You never scramble, you never underpay, and you never accidentally spend your tax reserve on something else.
This system pairs naturally with tracking your business expenses in Schedule C categories — because your net profit (the number you calculate taxes on) is only accurate if your expenses are properly tracked and deducted.
What to Do If You Missed a Payment
Pay it as soon as you realize. The penalty for underpayment is calculated daily — the sooner you pay, the less you owe. File Form 2210 with your annual return to calculate the exact penalty. It's usually small relative to the tax owed, but it's entirely avoidable with a system.
Frequently Asked Questions
How much should a self-employed person set aside for taxes?
Most self-employed people should set aside 25–30% of net profit for taxes. Higher earners in high-tax states may need 30–35%. The exact amount depends on your net profit, filing status, state tax rate, and deductions.
What is the self-employment tax rate in 2026?
The self-employment tax rate is 15.3% of net self-employment income — 12.4% for Social Security (up to the wage base) and 2.9% for Medicare. You can deduct half of SE tax from your gross income when calculating federal income tax.
Do I have to pay quarterly taxes if I'm self-employed?
Yes, if you expect to owe $1,000 or more in federal taxes for the year, you're required to make quarterly estimated tax payments. Failure to pay can result in an underpayment penalty.
What happens if I miss a quarterly tax payment?
You'll owe an underpayment penalty calculated at the federal short-term interest rate plus 3%, applied daily to the underpaid amount. Pay as soon as you realize — the penalty grows daily.
Can I deduct business expenses to reduce my self-employment tax?
Yes — SE tax is calculated on net profit (revenue minus business expenses). Every legitimate business expense you deduct reduces both your SE tax and your income tax. Tracking expenses in Schedule C categories maximizes your deductions.
Ready to Put This Into Action?
Knowing the strategy is step one. Having the right tool is step two. ProfitPath for Freelancers – Google Sheets tracks your net profit monthly, calculates your quarterly tax reserve automatically, and tells you exactly what to set aside — so tax season is never a surprise. Instant download, yours forever.
Or browse the full Budgeting Templates collection to find the right tool for your situation.