How do sole proprietors pay taxes? (2026)
Short answer: a sole proprietor reports business profit on Schedule C of the personal Form 1040, pays self-employment tax (Social Security and Medicare) on that profit on Schedule SE, and usually pays both during the year through quarterly estimated payments (Form 1040-ES), because no employer withholds for you.
General educational information on U.S. federal tax, not tax, legal or accounting advice. Check current IRS instructions and your state's rules, or ask a qualified preparer.
Do I need to make quarterly estimated payments?
Usually yes, if you expect to owe $1,000 or more in federal tax for the year after subtracting withholding and refundable credits. Missing or short payments can lead to an underpayment penalty, even if you end up due a refund.
You don't have to pay estimated tax for 2026 if all three apply: you had no tax liability for 2025, you were a U.S. citizen or resident alien for all of 2025, and your 2025 tax year covered 12 months.
2026 federal estimated payment calendar
| Payment | Income period | Due date |
|---|---|---|
| 1 | Jan 1 – Mar 31, 2026 | April 15, 2026 |
| 2 | Apr 1 – May 31, 2026 | June 15, 2026 |
| 3 | Jun 1 – Aug 31, 2026 | September 15, 2026 |
| 4 | Sep 1 – Dec 31, 2026 | January 15, 2027 |
If a due date falls on a Saturday, Sunday or legal holiday, a payment made the next business day is on time. You can also pay more often (weekly or monthly) as long as enough is paid by each due date.
How much should I pay? The safe harbor
You generally avoid the underpayment penalty if your withholding plus estimated payments cover the smaller of:
- 90% of your 2026 tax, or
- 100% of the tax on your 2025 return, or 110% if your 2025 adjusted gross income was over $150,000 ($75,000 if married filing separately).
Safe harbor protects you from the penalty, not from a balance due. If your income jumps, you can still owe a large amount in April. If your income arrives unevenly, the annualized income method on Form 2210 may lower or remove a penalty.
What is self-employment tax?
- The rate is 15.3%: 12.4% Social Security plus 2.9% Medicare.
- It applies to 92.35% of your net profit (Schedule SE, line 4a).
- For 2026, the 12.4% Social Security part applies only to the first $184,500 of combined wages and self-employment earnings. The 2.9% Medicare part has no cap.
- An additional 0.9% Medicare tax applies above $200,000 (single or head of household), $250,000 (married filing jointly) or $125,000 (married filing separately).
- You owe it once net self-employment earnings are $400 or more.
- You deduct the employer-equivalent half of it when figuring adjusted gross income.
Business profit is not your bank balance
Three numbers get mixed up:
- Deposits: everything that hit the account, including transfers, loans and your own money.
- Business profit: income minus business expenses (Schedule C, line 31).
- Net self-employment earnings: profit × 92.35%, the base for self-employment tax.
Separate owner funding, loans and transfers from sales before you estimate anything.
Other 2026 numbers worth knowing
| Item | 2026 figure |
|---|---|
| Standard mileage rate, business | 72.5 cents per mile (Jan 1 – Jun 30); 76 cents per mile (Jul 1 – Dec 31), after the IRS's mid-year increase |
| Qualified business income (QBI) deduction | Up to 20% of qualified business income, now permanent. New for 2026: a $400 minimum deduction if you have at least $1,000 of QBI from active businesses you materially participate in. The simpler Form 8995 applies when 2026 taxable income before the deduction is at or below $201,750 ($403,500 married filing jointly). |
Because the mileage rate changed mid-year, log the date of every business trip, not just the miles.
A monthly routine that works
- Record every sale and expense; keep receipts.
- Reconcile bank and card accounts.
- Check for duplicated expenses and wrong categories.
- Update a simple year-to-date profit and household tax forecast.
- Before each due date, decide your payment from the forecast or the safe harbor.
FAQ
- Do sole proprietors have to pay quarterly taxes?
- Usually, if you expect to owe $1,000 or more in federal tax for the year after withholding and refundable credits. The 2026 due dates are April 15, June 15 and September 15, 2026, and January 15, 2027.
- What is the self-employment tax rate for 2026?
- 15.3%: 12.4% Social Security on combined wages and self-employment earnings up to $184,500, plus 2.9% Medicare with no cap, applied to 92.35% of net profit. An additional 0.9% Medicare tax applies above $200,000 single, $250,000 married filing jointly or $125,000 married filing separately.
- Can I deduct my home office?
- Only if a specific part of your home is used regularly and exclusively for your business, as your principal place of business or a place you meet clients, with records to show it. Storage of inventory and daycare use have narrow exceptions (IRS Publication 587).
- Do I need a separate business bank account?
- It's generally not required for a sole proprietor, but a separate account makes reconciling and proving business expenses far easier.
- What records should I give my tax preparer?
- Reconciled annual totals by Schedule C line, a dated mileage log, home-office details, health-insurance premiums, estimated payments made, and a list of open questions.
Go deeper
The Sole Proprietor's Year-Round Tax System by Andreas Henriksson walks first-year sole proprietors and freelancers from recording a customer payment to a household tax forecast, the 2026 estimated-payment calendar, mapping records to Schedule C, and a tax-preparer handoff package.
Sources
- IRS: Estimated taxes ($1,000 rule, 90%/100% safe harbor, paying more often)
- IRS FAQ: When are quarterly estimated tax payments due?
- IRS: 2026 Form 1040-ES (110% rule for AGI over $150,000 / $75,000)
- IRS: Self-employment tax (15.3%, $184,500 for 2026, $400, 0.9% thresholds)
- IRS: 2026 Schedule SE (92.35%, Schedule C line 31)
- SSA: 2026 COLA fact sheet (2026 wage base $184,500)
- IRS: Standard mileage rates
- IRS: Qualified business income deduction and 2026 Publication 505
- IRS Publication 587: Business use of your home