How to File Quarterly Taxes:
A Contractor's 2026 Guide
Yes — as a self-employed contractor with no tax withheld, you pay estimated taxes to the IRS four times a year, not once in April. The 2026 due dates are April 15, June 15, September 15, and January 15, 2027. Pay on time using the safe-harbor rule and you avoid the underpayment penalty.
How to file quarterly estimated taxes
Because you are self-employed, no one withholds tax from your pay, so the IRS asks you to pay it as you earn — in four estimated installments. The job is to estimate what you will owe for the year (income tax plus 15.3% self-employment tax), split it into four, and pay each piece by its deadline using IRS Direct Pay, EFTPS, or a Form 1040-ES voucher.
- Estimate your annual net profit (what clients pay you, minus your business deductions).
- Compute your tax on it: 15.3% self-employment tax plus income tax at your bracket.
- Divide that total by four to get each quarterly payment.
- Pay each installment by its deadline via IRS Direct Pay, EFTPS, or a Form 1040-ES voucher.
Who has to pay quarterly taxes
Generally, you must pay estimated tax quarterly if you expect to owe $1,000 or more when you file your return, after subtracting any withholding and credits. For self-employed contractors with nothing withheld, that threshold is reached at a fairly low income, so most full-time 1099 workers are in.
If you also have a W-2 job (or a spouse who does), you can sometimes cover your contractor tax by withholding extra there instead of mailing estimated payments — but if you are purely self-employed, quarterly estimates are how you stay current.
For the underlying mechanics of the self-employment tax you are estimating, see our self-employment tax guide and the commercial overview at 1099 contractor taxes.
The 2026 quarterly tax due dates
Estimated tax is paid in four installments tied to "earning periods" that are not equal calendar quarters. All four 2026 dates fall on weekdays, so there is no weekend or holiday shift this year. Mark them now — the IRS does not send a reminder.
| Income period | Payment due |
|---|---|
| Jan 1 – Mar 31, 2026 | April 15, 2026 |
| Apr 1 – May 31, 2026 | June 15, 2026 |
| Jun 1 – Aug 31, 2026 | September 15, 2026 |
| Sep 1 – Dec 31, 2026 | January 15, 2027 |
How much to pay: the safe-harbor rule
You do not have to predict your income perfectly. The safe-harbor rule lets you avoid the underpayment penalty no matter what your final bill is, as long as your payments hit a target based on a known number — last year's tax.
Pay at least 100% of last year's total tax (or 110% if your prior-year AGI was over $150,000), split into four equal installments, and no underpayment penalty applies regardless of what you settle up in April. Alternatively, you can pay 90% of the current year's tax, but that requires estimating this year accurately, so most contractors lean on the prior-year number.
A rough working estimate when you have no prior return to lean on: annual net profit × about 25–30% (the 15.3% SE tax plus income tax), divided by four.
How to actually pay your estimated taxes
IRS Direct Pay. Free, no account needed. Pay directly from your checking or savings account at irs.gov/payments and keep the confirmation number. This is the simplest option for most contractors.
EFTPS (Electronic Federal Tax Payment System). A free government system you enroll in once. It lets you schedule payments in advance and keeps a full history, which is handy if you want all four quarters set up at the start of the year.
Form 1040-ES voucher. The paper route: the 1040-ES package includes payment vouchers and worksheets to figure the amount, which you mail with a check. Most people now pay electronically, but the worksheet is still the best tool for calculating what to send.
What happens if you miss a quarterly payment
Missing or underpaying a quarter triggers the IRS underpayment of estimated tax penalty. It is not a flat fine — it works like interest, charged on the shortfall for each day it stays unpaid, so a payment that is a little late costs only a little.
The rate floats: the IRS sets it quarterly, and it is currently 7% per year for the first quarter of 2026. Because it accrues by the day, the fastest way to limit the damage is to make the missed payment as soon as you can rather than waiting for the next deadline.
You still reconcile everything on your annual return, where the penalty is calculated on Form 2210. Hitting the safe-harbor target across your four payments is what prevents the penalty in the first place.
A worked quarterly estimate, start to finish
Walking the four steps with real numbers makes the process concrete. Say you expect $100,000 of net profit this year as a 1099 contractor and you have no prior-year return to safe-harbor against.
Estimate the tax at a blended ~27% (the 15.3% self-employment tax plus income tax at your bracket): $100,000 × 27% ≈ $27,000 for the year. Divide by four and you owe roughly $6,750 each quarter, paid by April 15, June 15, September 15, and January 15, 2027.
This is illustrative — your real rate depends on deductions, retirement contributions, and filing status, which is exactly the part a contractor-focused preparer dials in so you are not over- or under-paying every quarter.
Frequently Asked Questions
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