But if you're self-employed, a gig worker, or earning money from side hustles, the IRS expects a check four times a year — not once.
Miss those dates and the penalty can quietly pile up, even if you end up getting a refund.
You pay as you earn instead of settling up in April, because no employer is withholding money from your paycheck on your behalf.
Roughly 23 million taxpayers owe these payments each year, according to IRS data, and a large share of them are first-timers who don't find out until a bill arrives.
Here's the part that trips people up: there's no W-2, no automatic deduction, no reminder email with a friendly subject line.
The deadlines land on April 15, June 15, September 15, and January 15.
Miss one and the IRS tacks on interest plus a penalty calculated on the amount you should have paid.
Freelancers, consultants, rideshare and delivery drivers, real estate agents, small business owners, and anyone pulling in meaningful income from a side gig — tutoring, Etsy sales, freelance writing, dog walking.
Even some retirees and investors with significant dividend or capital gains income can fall into the category.
The rule of thumb from the IRS: if you expect to owe at least $1,000 in federal tax for the year, you likely need to make quarterly payments.
A common shortcut is to pay 100% of last year's tax bill, or 90% of this year's, whichever is smaller.
That second number is tricky when income is unpredictable, which is exactly why many freelancers get burned.
Setting aside 25% to 30% of every payment you receive into a separate savings account takes the sting out of the deadline.
Using IRS Direct Pay or the Electronic Federal Tax Payment System is free and takes minutes.
And if your income swings wildly, the annualized installment method lets you pay based on what you actually earned in each period rather than spreading it evenly.
Worth checking now: the IRS "safe harbor" rules, which protect you from penalties if you hit certain thresholds based on prior-year income.
A tax professional or good software can run the math in an afternoon.
Waiting until April to think about this is how a manageable bill turns into a nasty surprise.
The bottom line: estimated taxes aren't optional, and the IRS isn't going to remind you.
Final Thoughts
Set a calendar alert for each deadline, move a slice of every deposit into savings, and treat the quarterly payment like rent — annoying, non-negotiable, and cheaper than the alternative.