When you’re an employee, taxes come out of every paycheck automatically, you barely think about it. When you’re self-employed, a freelancer, or a gig worker, nobody does that for you, which means the IRS expects you to pay your own taxes four times a year. The next deadline is close: third-quarter estimated taxes for 2026 are due September 15. Here’s who has to pay, how much, and exactly how to handle it before the date.
The short answer
If you earn self-employment or gig income and expect to owe at least $1,000 in federal tax for the year, you’re generally required to make quarterly estimated tax payments. Each payment covers both your income tax and your self-employment tax, and the 2026 due dates are April 15, June 15, September 15, and January 15, 2027. The Q3 payment, due September 15, covers what you earned from June through August. Miss it or pay too little, and the IRS can tack on a penalty.
Why you have to do this
Employees have it easy here: their employer withholds income tax, Social Security, and Medicare from every check and sends it in. As a self-employed worker or independent contractor, you’re your own payroll department. Clients paying you on a 1099 don’t withhold anything, so the full tax bill lands on you, and the IRS wants it as you earn, not in one lump next April. That “pay as you go” system is what estimated taxes are. If you’ve wondered about the tax differences between W-2 and 1099 work, this is one of the biggest: withholding versus doing it yourself.
Do you actually have to pay?
The trigger is simple: if you expect to owe $1,000 or more in federal tax for the year after subtracting any withholding and credits, you’re on the hook for quarterly payments. For most freelancers and gig workers, that threshold gets crossed almost immediately. (A few states set their own lower bars, California, for instance, starts at $500.)
One useful exception: if you have a regular W-2 job on the side, you don’t necessarily have to mail quarterly checks. You can instead increase the withholding on your day-job W-4 to cover your side-gig taxes, which spares you the four-times-a-year hassle.
The 2026 due dates
The “quarters” aren’t even three months each, which trips people up. Here are the 2026 dates:
- Q1: April 15, 2026 (income from January through March)
- Q2: June 15, 2026 (April and May)
- Q3: September 15, 2026 (June through August)
- Q4: January 15, 2027 (September through December)
So the payment due September 15 is the summer quarter. If a date lands on a weekend or holiday, it shifts to the next business day.
What you’re actually paying
Each estimated payment bundles two taxes:
- Federal income tax, at your normal bracket.
- Self-employment tax, which is 15.3% of your net self-employment earnings (12.4% for Social Security on income up to $184,500 in 2026, plus 2.9% for Medicare with no cap).
That self-employment tax is the part that surprises new freelancers. It’s the same Social Security and Medicare tax that makes up FICA on an employee’s paycheck, except an employee splits it with their employer. You cover both halves. The one bit of relief: you can deduct half of your self-employment tax when figuring your income tax.
How much to pay: the safe-harbor shortcut
You don’t have to predict your whole year perfectly. The easiest way to stay penalty-proof is the safe harbor rule: pay 100% of last year’s total tax (110% if your prior-year income was over $150,000), split into four equal payments. Do that, and the IRS won’t hit you with an underpayment penalty even if you end up owing more, as long as you settle the balance by the April filing deadline.
If you’d rather estimate from scratch, a common rule of thumb is to set aside 25% to 30% of your net self-employment income for taxes. Whichever route you take, Form 1040-ES walks through the calculation. And it’s smart to keep that tax money in a separate account so it’s there when the date comes.
How to pay before September 15
Paying is the easy part, and free. The simplest option is IRS Direct Pay, which pulls straight from your bank account with no account to set up. You can also use EFTPS or the IRS2Go app. The IRS estimated taxes page lays out every method. When you pay, select “estimated tax,” choose Form 1040-ES, pick the 2026 tax year, and save the confirmation number. Two minutes, done.
Behind on Q1 or Q2? Fix it on Q3
If you guessed low earlier in the year, or skipped a payment, don’t wait until January to catch up, that only grows the penalty. Make a realistic Q3 payment now, and if you can, add some or all of what you missed. The underpayment penalty runs around 8% annualized, so the sooner you close the gap, the less it costs. For the details on rates and calculations, the IRS self-employment tax guidance is the primary source.
Keep records, for taxes and for proof
Paying quarterly is easier when you track your income all year instead of scrambling each deadline. Good records do double duty: they tell you what to pay, and they give you proof of income when you rent an apartment or apply for a loan, which is a real hurdle without a W-2. Many self-employed workers keep a running spreadsheet or use bookkeeping software, and some turn their earnings into a clean, documented record with a pay stub generator like ePaystubs. However you do it, having your numbers organized makes both proving your income as a self-employed worker and verifying gig app earnings far less stressful.
Keeping it real
Quarterly taxes feel like a chore, and the first one really is confusing. But the system is more forgiving than it looks. The safe harbor rule means you don’t have to nail your income to the dollar, you just have to pay in a reasonable amount on time. Set aside a rough quarter of what you earn, use last year’s tax as your guide, pay through IRS Direct Pay before September 15, and keep your records tidy. Do that and estimated taxes go from a scary unknown to a routine you handle in a few minutes each quarter.
Frequently asked questions
When are quarterly estimated taxes due in 2026? April 15, June 15, September 15, 2026, and January 15, 2027. The Q3 payment due September 15 covers income earned from June through August 2026.
Who has to pay quarterly estimated taxes? Generally, anyone who expects to owe at least $1,000 in federal tax for the year after withholding, which includes most freelancers, gig workers, independent contractors, and self-employed people. Some states have lower thresholds.
How much should I set aside for quarterly taxes? A common rule of thumb is 25% to 30% of your net self-employment income, covering both income tax and the 15.3% self-employment tax. The safe harbor method (100% of last year’s tax, or 110% if your prior AGI topped $150,000) is the penalty-proof approach.
What happens if I miss the September 15 deadline? The IRS charges an underpayment penalty, currently around 8% annualized, on what you should have paid. If you miss or underpay, make a payment as soon as you can to limit it, rather than waiting until you file.
The short version
If you’re self-employed or a gig worker expecting to owe $1,000+ in federal tax, you pay estimated taxes four times a year, and Q3 2026 is due September 15, covering June through August income. Each payment includes your income tax plus 15.3% self-employment tax (both halves of Social Security and Medicare, since no employer splits it with you). The easy, penalty-proof approach is the safe harbor: pay 100% of last year’s tax (110% over $150k AGI) in four equal installments. Calculate with Form 1040-ES, pay free through IRS Direct Pay before the date, set aside 25% to 30% as you earn, and keep records for both taxes and proof of income. Behind on an earlier quarter? Catch up on Q3 rather than waiting.
This article is general information, not tax, legal, or financial advice. Tax rules, rates, and deadlines change and vary by situation, so confirm current details with the IRS and check your own circumstances with a qualified tax professional.
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