Prompt CPAUpdated for the 2026 tax year.
If you earn money that doesn't have tax withheld — self-employment or freelance income, investment gains, rental income, or a bonus or stock vesting that wasn't fully withheld — the IRS doesn't wait until April. It generally expects tax to be paid as you earn it — through withholding or, when that isn't enough, estimated tax payments during the year. Here's who actually has to make estimates, how much to send, when, and the easiest ways to pay.
Do you even need to pay estimated taxes?
The general rule: you may need to make estimated payments if, after subtracting your withholding and refundable credits, you'll still owe at least $1,000 in federal tax — and your withholding and credits aren't enough to meet one of the IRS safe harbors (covered just below). Owing $1,000 on its own doesn't automatically mean you have to pay estimates; it's both conditions together. In practice, that tends to catch:
- Freelancers, independent contractors, and small-business owners — income with no withholding at all.
- People with significant investment income — interest, dividends, or capital gains.
- Employees whose withholding doesn't keep up with reality — often after a large bonus, RSU vesting, or a new side income stream.
- Retirees taking distributions without enough tax withheld.
One note for the self-employed: your estimated payments generally cover both federal income tax and self-employment tax (Social Security and Medicare) — which is why the total is often larger than people expect.
If you're a W-2 employee and your withholding already covers your tax, you generally don't need to bother — put simply, if your withholding already satisfies one of the safe harbors below, separate quarterly payments usually aren't necessary. And here's an underused option: instead of writing quarterly checks, you can often just increase your paycheck withholding — withholding is treated as paid evenly across the year, which is simpler and can even cure an under-payment late in the year.
How much? The safe harbor is the number that matters
You don't have to predict your exact tax to stay penalty-free. The idea is a "safe harbor": pay in — through withholding and estimated payments combined — at least the smaller of these two amounts for the year, and you generally won't owe an underpayment penalty even if your final bill comes in higher.
| Safe harbor option | Pay at least… |
|---|---|
| Based on this year | 90% of your total 2026 tax |
| Based on last year | 100% of your total 2025 tax — or 110% if your 2025 AGI was over $150,000 ($75,000 if married filing separately) |
For many people the prior-year figure is the easiest target, because you already know the number. If your income is fairly consistent through the year, dividing that amount into four equal payments is a straightforward way to stay on track. If it's lumpy — a big fourth quarter, say — the annualized method described below lets you match payments to when you actually earned, rather than paying a flat quarter each time.
When: the 2026 due dates
The "quarters" aren't even three-month blocks — the periods are lopsided, so the dates are worth putting on the calendar:
| Quarter | Income earned | Payment due |
|---|---|---|
| Q1 | Jan 1 – Mar 31 | April 15, 2026 |
| Q2 | Apr 1 – May 31 | June 15, 2026 |
| Q3 | Jun 1 – Aug 31 | September 15, 2026 |
| Q4 | Sep 1 – Dec 31 | January 15, 2027 |
If a due date lands on a weekend or legal holiday, it rolls to the next business day.
One deadline that isn't on this table: if you filed an extension for your 2025 return, that return is due October 15, 2026. It's an extension to file, not to pay — any balance was still due back in April — so it's a separate deadline from the Q3 estimate due September 15. Here's what to have in order before the October 15 extension deadline.
How to pay the IRS
Paying is the easy part — you have several free or low-cost options:
- IRS Direct Pay — free, straight from your bank account, with no account to set up. The simplest choice for most individuals.
- Your IRS Online Account — pay and see your full payment history in one place.
- EFTPS — the Electronic Federal Tax Payment System; it requires enrollment and is popular with businesses making regular payments.
- Debit or credit card — works, but the third-party processors charge a fee.
- By mail — a check with a Form 1040-ES voucher.
Ready to send a payment and want the exact click-by-click steps? See our walkthrough for paying federal estimated taxes online.
What happens if you underpay
The underpayment "penalty" isn't a flat fine — it works like interest, charged on how much you underpaid and for how long you were behind. The rate is the federal underpayment rate, currently 7% per year for the third quarter of 2026; the IRS resets it quarterly.
A few things that help:
- Hit either safe harbor above and the penalty generally doesn't apply at all.
- If your income is uneven — say most of it lands in Q4 — the annualized income installment method lets you match payments to when you actually earned, which can shrink or eliminate the penalty.
- There's generally no underpayment penalty if your tax due after subtracting withholding and refundable credits is under $1,000, or if you had no tax liability for a full 12-month prior year and filed a return for that year.
Don't forget your state
Most states with an income tax run their own estimated-payment system on a similar — but not identical — schedule, and paying the IRS doesn't cover it. If you're in New Jersey or New York, we have step-by-step walkthroughs here: how to pay NJ quarterly estimated taxes and how to pay NY quarterly estimated taxes.
The bottom line
Estimated taxes are less about predicting the future than about hitting a known target. Figure your safe-harbor number, split it across the four due dates, pay it through IRS Direct Pay, and keep the confirmations. The people who get tripped up are usually the ones with lumpy income or a big one-time gain — exactly the situations where a little planning saves real money.
This article is general educational information, not individualized tax advice. Please consult a qualified tax professional about your own situation before making decisions.