If you're self-employed, a gig worker, or earn money from investments, the IRS expects a cut four times a year — not just in April.
The next estimated tax payment deadline is September 15, and missing it can trigger penalties that quietly pile up.
Unlike traditional employees who have taxes withheld from every paycheck, freelancers and independent contractors have to send money to the government themselves.
The system is called estimated taxes, and it covers income that isn't subject to withholding.
The problem is that most people don't know it exists until they owe a penalty.
Here's how it works: you estimate what you'll owe for the year, then split it into four payments due in April, June, September, and January.
If you underpay — even accidentally — the IRS charges interest on the shortfall.
The penalty rate is currently around 7% to 8% annually, depending on the quarter.
That may not sound like much, but on a $10,000 tax bill, it can add hundreds of dollars in extra charges.
Anyone who expects to owe $1,000 or more in taxes after subtracting withholding and credits.
That includes rideshare drivers, Etsy sellers, consultants, real estate agents, and people earning significant dividend or rental income.
There's a safe harbor rule that can protect you.
If you pay at least 90% of your current year's tax liability or 100% of last year's (110% if your income was above $150,000), you avoid the underpayment penalty entirely.
For many gig workers, paying 100% of last year's tax bill is the simpler path — especially if income is unpredictable.
The September 15 deadline covers income earned from June through August.
But you can also adjust your payment if your earnings dropped.
The IRS doesn't require you to overpay if you're making less this year.
One common mistake: assuming that because you filed an extension in April, you can wait until October to pay.
An extension to file is not an extension to pay.
Interest and penalties start accruing in April regardless.
Another trap is forgetting that estimated taxes apply to more than just income tax.
Self-employment tax — which covers Social Security and Medicare — also needs to be paid quarterly.
That's 15.3% on net earnings, and it catches many new freelancers off guard.
You can catch up with a larger September payment or ask for a payment plan.
The IRS also has a first-time penalty abatement program for people with a clean compliance history.
The simplest way to stay ahead is to set aside 25% to 30% of every payment you receive into a separate savings account.
When the quarterly deadline arrives, the money is already there.
Apps like Keeper, QuickBooks Self-Employed, and even a basic spreadsheet can help you track what you owe.
Some tax software will calculate your estimated payment automatically based on your income.
The bottom line: if you earn money outside a traditional paycheck, the tax system treats you as a small business.
That means quarterly payments aren't optional — they're part of the deal.
If you're not sure whether you owe, a quick check with a tax professional or IRS worksheet can save you from a surprise bill later.
The tax code rewards people who plan ahead.
Final Thoughts
For freelancers, that planning starts with four dates a year, not one.