The first year I had freelance income, April hit me like a surprise bill I’d forgotten to budget for. Nobody had withheld taxes from those payments, so I owed a lump sum — plus a small penalty for not paying along the way. That penalty is exactly what quarterly estimated taxes are designed to help you avoid. If you earn money that doesn’t have taxes taken out automatically, this guide is for you.
What are estimated taxes (and who pays them)?
The U.S. tax system is “pay as you go.” When you have a regular job, your employer withholds taxes from each paycheck. But if you earn income with no withholding — freelancing, a side hustle, 1099 contract work, investment income, or a small business — you’re expected to pay the tax yourself, in four installments through the year.
You generally need to pay estimated taxes if you expect to owe $1,000 or more when you file. The IRS explains the rules at irs.gov.
2026 quarterly due dates
Estimated taxes are paid in four installments. For the 2026 tax year, the deadlines are:
| Quarter | Income period | Payment due |
|---|---|---|
| Q1 | Jan 1 – Mar 31, 2026 | April 15, 2026 |
| Q2 | Apr 1 – May 31, 2026 | June 15, 2026 |
| Q3 | Jun 1 – Aug 31, 2026 | September 15, 2026 |
| Q4 | Sep 1 – Dec 31, 2026 | January 15, 2027 |
Notice the “quarters” aren’t equal three-month blocks — Q2 covers two months and Q4 covers four. Mark these dates now so none sneak up on you.
How much should you pay each quarter?
A simple approach: estimate your total tax for the year, then divide by four. Your total tax is roughly your federal income tax plus self-employment tax (15.3% on net self-employment income, covering Social Security and Medicare).
To ballpark the income-tax portion, run your expected income through the Income Tax Estimator. A common shortcut for self-employed people is to set aside 25–30% of each payment they receive into a separate “tax” account, so the money is ready when each deadline arrives.
The safe-harbor rule (avoid penalties the easy way)
You don’t have to predict your taxes perfectly. The IRS gives you a “safe harbor” — pay enough and you won’t owe a penalty even if you under-estimate. You’re generally safe if you pay the smaller of 90% of what you’ll owe this year, or 100% of what you owed last year (110% if your income is over $150,000). The easiest version for many people: take last year’s total tax and pay that amount split into four.
How to actually pay (step by step)
1. Estimate your yearly tax (income tax plus self-employment tax). Use the Income Tax Estimator for the income-tax piece.
2. Divide by four (or use the safe-harbor number above).
3. Pay online through IRS Direct Pay or EFTPS at irs.gov. It takes a few minutes; no mailing checks.
4. Save the confirmation for each payment — you’ll report them when you file.
5. Don’t forget your state. Most states with an income tax have their own quarterly estimates and deadlines.
A simple system that prevents surprises
The habit that fixed this for me: every time a client paid, I immediately moved ~28% into a separate savings account I never touched. When each quarterly deadline came, the money was already there. No scramble, no dipping into rent money. Pair that with the four dates above and quarterly taxes stop being scary.
Frequently asked questions
What happens if I miss a quarterly payment?
You may owe a small underpayment penalty plus interest — but it’s usually modest. Pay as soon as you can; partial and late is better than nothing.
Do I still pay quarterly if I also have a W-2 job?
You can, but many people instead increase the withholding on their W-2 job to cover the side income — which avoids quarterly payments entirely. Compare your take-home with the Take-Home Pay Calculator.
How do I know if I owe $1,000?
Estimate your net self-employment or untaxed income and multiply by your rough tax rate. If the result tops $1,000, plan to pay quarterly.
Are estimated taxes only federal?
No — most states with income tax want quarterly estimates too. Check your state’s tax website.
The takeaway
Quarterly estimated taxes are just the self-employed version of withholding: pay as you earn, in four installments (Apr 15, Jun 15, Sep 15, and Jan 15), so you avoid a big April bill and a penalty. Estimate with the Income Tax Estimator, set aside ~25–30% of each payment, and use the safe-harbor rule to stay penalty-free. If you’re a contractor, also read W-2 vs 1099.
General educational information for the 2026 tax year, not tax advice. Confirm details with the IRS or a qualified tax professional.
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