The four due dates, the safe-harbor rules that protect you from penalties, and the cleanest way to calculate and pay each installment.
| THE SHORT VERSION Freelancers generally must pay as they earn. If you expect to owe $1,000+ for the year, the IRS expects four estimated payments — not one check in April. The safe harbor is your friend: pay 100% of last year’s total tax (110% if prior AGI exceeded $150,000) in four equal installments and you owe no penalty regardless of what this year brings. Pay online in minutes via your IRS Online Account or IRS Direct Pay — no vouchers, no mail, instant confirmation. |
Employees never think about this because their employer withholds tax from every paycheck. When you’re self-employed, nobody withholds anything — so the IRS replaces withholding with four estimated payments across the year. Miss them and the eventual bill is the same, plus an interest-based penalty for paying late.
The 2026 due dates
The quarters are famously uneven — Q2 covers only two months. Put all four in your calendar now:
| Payment | Covers income earned | Due date |
|---|---|---|
| Q1 | January 1 – March 31, 2026 | April 15, 2026 |
| Q2 | April 1 – May 31, 2026 | June 15, 2026 |
| Q3 | June 1 – August 31, 2026 | September 15, 2026 |
| Q4 | September 1 – December 31, 2026 | January 15, 2027 |
| NOTE When a due date lands on a weekend or federal holiday, it shifts to the next business day. And yes — the Q4 payment for one tax year is due in January of the next calendar year. Budget for it before holiday spending, not after. |
Who has to pay
The trigger is expecting to owe at least $1,000 in tax for the year after subtracting any withholding and credits. In practice, almost any freelancer netting more than roughly $5,000–$7,000 in profit crosses it, because self-employment tax alone (15.3% of net earnings) gets you there quickly.
Side-hustlers with a W-2 job have an elegant exit: instead of making quarterly payments, increase withholding at the day job (file a new W-4 with extra withholding). Withholding is treated as paid evenly through the year no matter when it happens — a legal quirk that can erase a penalty even in December.
The safe harbor: the rule that removes the guesswork
You do not need to predict this year’s income perfectly. The penalty disappears if your four payments meet any one of these tests:
- 90% of this year’s actual tax — accurate but requires forecasting;
- 100% of last year’s total tax — the number is sitting on last year’s Form 1040, line “total tax.” Divide by four. Done;
- 110% of last year’s total tax, if last year’s adjusted gross income exceeded $150,000 ($75,000 married filing separately).
The prior-year harbor is the working freelancer’s default: it converts an unpredictable forecasting problem into four known, fixed payments. If income jumps, you’ll owe the difference in April — but with zero penalty, and you’ve had use of the cash all year.
Calculating each payment
Two workable methods, in increasing order of effort:
- Prior-year method (recommended default): last year’s total tax × 100% (or 110%) ÷ 4. Fixed, penalty-proof, five minutes once a year.
- Current-year estimate: project this year’s profit, estimate total tax (our set-aside guide walks the math), take 90%, divide by four. Better when income has dropped — no reason to pay at last year’s level if this year is leaner.
If your income is lumpy — a huge Q4, a dead summer — the annualized income method (Form 2210, Schedule AI) lets payments track when income actually arrived. It’s paperwork-heavy; most freelancers are better served by the fixed prior-year harbor plus a disciplined set-aside account.
How to actually pay (the 10-minute version)
- IRS Online Account (irs.gov/account) — the best option. Pay from a bank account, see your full payment history, and confirm past quarters at filing time. One-time identity setup, then trivially easy.
- IRS Direct Pay (irs.gov/payments) — no account needed. Choose “Estimated tax,” Form 1040-ES, the correct tax year, pay from your bank. Free. Save the confirmation number.
- EFTPS — the Treasury’s system; ideal if you also run payroll or want scheduled future payments. Enrollment takes about a week by mail, so start early.
- Card payments work but cost a processing fee (≈1.8%+) — rarely worth it unless chasing a card bonus that outruns the fee.
Select the correct tax year and “1040-ES estimated tax” when paying — the most common self-inflicted wound is money credited to the wrong year. And most states run separate estimated-payment systems with the same rhythm; check your state’s revenue site.
If you miss one
Breathe. The penalty is essentially interest — the federal underpayment rate applied to the shortfall for the days it was late. Painful at hundreds of dollars, not thousands, for most freelancers. The play: pay the missed installment immediately (interest accrues daily; there is no benefit to waiting for the next due date), then keep the remaining quarters on schedule. Form 2210 reconciles it at filing; good tax software handles the computation.
The one-page routine
- January: pull last year’s total tax, divide by four, and calendar the four dates.
- Every client payment: transfer your set-aside percentage to the tax account (see our set-aside guide).
- Each due date: pay the installment from that account via your IRS Online Account. Screenshot the confirmation.
- Mid-year: if profit is running 25%+ ahead of last year, top up Q3 and Q4 — April, you will send thanks.
This guide covers federal rules for tax year 2026 in general terms and is not individualized tax advice. Multi-state income, S-corp payroll, or a large prior-year shortfall are all good reasons to involve a CPA. Dates and thresholds are refreshed every January.