You cleared $58,000 freelancing in 2025, set aside money for taxes, filed in April, paid the bill in full. Then a second notice arrives: an underpayment penalty, a couple hundred dollars. You didn't underpay. You paid all at once instead of four times across the year. The tax system expects self-employed people to pay as they earn, and it keeps a calendar. Miss the dates and the penalty shows up whether or not your final math checked out.

Below is every 2026 date that matters, what each one covers, and the rule that quietly moves them around. Treat the specific dates as a starting point and confirm them against the IRS estimated taxes page before you send money. Weekends and holidays shift things, and your state may not follow the federal schedule.

The four estimated-tax due dates

Expect to owe $1,000 or more when you file? The IRS wants estimated payments four times a year. These cover income tax plus self-employment tax — Social Security and Medicare, 15.3% layered on top. For income earned in 2026, the dates are:

  • April 15, 2026 — Q1, for January through March
  • June 15, 2026 — Q2, for April and May
  • September 15, 2026 — Q3, for June through August
  • January 15, 2027 — Q4, for September through December

Look closely and the "quarters" aren't quarters. Q2 covers two months, Q4 covers four, and the last payment falls in the next calendar year. That mismatch trips people up constantly. Budget by the calendar above — don't count three months forward from your last payment and assume you're safe.

Say your total tax for the year works out to about $8,000. Split evenly, that's roughly $2,000 a due date. Our quarterly tax calculator will size yours, and the estimated taxes walkthrough covers the mechanics if the whole system is new.

The safe-harbor shortcut

Predicting your income perfectly isn't required. The IRS offers a "safe harbor": pay 100% of last year's total tax — 110% if your prior-year adjusted gross income topped $150,000 — and you generally dodge an underpayment penalty even if you end up owing more. For freelancers riding lumpy, unpredictable income, copying last year's number and paying it in four equal chunks is often the sanest play. Those thresholds can shift year to year, so check the current ones with the IRS.

The annual filing deadline, and the extension trap

Your 2025 return is due April 15, 2026 — the same day as your Q1 2026 estimated payment. That makes mid-April a genuine double hit: last year's balance and this year's first installment, both landing at once. Have cash ready for both.

Need more time? Form 4868 pushes your paperwork deadline to October 15, 2026. Now the part that burns people every year. An extension to file is not an extension to pay. If you owe for 2025, that money is still due April 15 — the extension only buys time to finish the forms. Interest and penalties keep accruing on any unpaid balance the entire stretch. Estimate what you owe and send it in April, even with the return half-done.

When your 1099s should arrive

Any client who paid you $600 or more in 2025 generally has to send a 1099-NEC. The deadline to get it to you and to the IRS is January 31. Since January 31, 2026 lands on a Saturday, it slides to Monday, February 2, 2026.

Two things worth pinning down. First, report the income even if the 1099 never arrives — the $600 figure is the client's filing trigger, not your income threshold. Untracked cash is still taxable. Second, check every form against your own records. A wrong number on a client's 1099 becomes your problem the moment the IRS matches it to your return.

How weekends and holidays move the dates

The rule itself is simple: when a deadline lands on a Saturday, Sunday, or legal holiday, it rolls forward to the next business day. That's why the 1099 date became February 2. It's also why April 15 occasionally becomes the 17th or 18th — Emancipation Day, a Washington, D.C. holiday on April 16, can nudge the federal filing deadline. Patriots' Day shifts things for filers in Maine and Massachusetts some years.

For 2026, the calendar mostly cooperates. April 15, June 15, September 15, and October 15 all fall on weekdays, so the estimated and filing dates above should hold as written. "Should" isn't "will," though. The IRS also grants disaster relief that pushes deadlines for specific states from time to time. Check the IRS site a week before any deadline rather than trusting a date you saved months ago.

A system so you never miss one

Freelancers who never get penalty notices tend to do the same boring thing. The day a client payment hits, they move a slice of it into a separate account. Twenty-five to thirty percent is a common starting point, though your real number depends on your income, your deductions, and whether your state taxes income at all. When a due date rolls around, the money is already sitting there and the payment is a non-event.

Put all six dates on your calendar right now, each with a one-week heads-up: the four estimated deadlines, April 15 for filing, and February 2 for chasing missing 1099s. Set them to repeat. A recurring reminder costs nothing and is the entire difference between paying on time and paying a penalty for being early but wrong-shaped.

Most calendars skip one thing: your state. Live somewhere with a state income tax and it probably runs its own quarterly schedule. Often it mirrors the federal dates — but not always. Add those deadlines too, so April doesn't ambush you twice.

This is general educational information, not personalized tax advice. Confirm all dates and amounts with the IRS or a qualified tax professional before you act.