If you earn money without an employer withholding taxes, the IRS has a message for you: the second quarter isn't over when you think it is.
Estimated tax payments for the period covering April through May were due June 15.
The third-quarter payment is due September 15, but many self-employed workers get tripped up by a different date entirely — the July 15 quarterly filing deadline many people confuse with estimated taxes.
Miss the wrong one and the penalties pile up quietly.
The U.S. tax system runs on pay-as-you-go rules.
Employees have money withheld every paycheck, so they rarely notice.
Freelancers, gig drivers, consultants, and small-business owners have to send the IRS money four times a year — roughly April 15, June 15, September 15, and January 15 of the following year.
The IRS charges interest and a penalty when you underpay, and it doesn't care that you were busy or confused.
The underpayment penalty rate has been hovering around 7% to 8% annually in recent years, which is far above the near-zero rates of the 2010s.
That's real money for anyone who owes a few thousand dollars.
Tax preparers, software companies, and accountants, mostly.
TurboTax and H&R Block sell estimated-tax reminders and "peace of mind" products.
Payroll services pitch themselves to freelancers as a fix.
The rules are complicated enough that a whole industry exists to help you follow them — and that industry has little incentive to make the math simpler.
There's an easy safety valve the IRS does offer.
If you paid at least 90% of this year's tax or 100% of last year's (110% if your income was high), you generally avoid the penalty.
That's why some people just pay based on last year's return and reconcile in April.
The practical move: if you're self-employed, set aside 25% to 30% of every payment you receive into a separate account.
Then send it in quarterly using IRS Direct Pay, which is free.
Ignore the apps charging subscription fees for what is essentially a calendar reminder.
Scammers know tax deadlines spook people.
Expect a wave of texts and emails claiming you owe back taxes and must pay immediately with gift cards or wire transfers.
The IRS does not text you out of the blue.
The real question is whether the quarterly system still makes sense for a workforce where gig income is normal and paychecks arrive erratically.
For now, it's the law, and the penalties are climbing.
Budgeting for it isn't optional — it's just the cost of being your own payroll department.
My take: the four-times-a-year schedule is a relic that punishes people for having irregular income, and the rising penalty rate makes it more punishing every year.
If you're self-employed, the smartest thing you can do is automate the set-aside and stop treating tax money as spending money.
Final Thoughts
The system is annoying, but ignoring it is far more expensive than planning for it.