If you started a side hustle, drove for a delivery app, or picked up freelance work in 2024, there's a decent chance the IRS is expecting money from you right now — and many people don't find out until the penalty shows up.
The reason is simple: nobody withholds taxes from a 1099 paycheck.
When you're a regular employee, your job quietly pulls money out of every check.
When you're self-employed, that job is yours.
The IRS still wants its cut four times a year, not once in April.
Those four dates are called estimated tax payments.
For 2025, they land around April 15, June 16, September 15, and January 15, 2026.
Miss one and the IRS can tack on interest plus a penalty — currently running about 7% annually on the unpaid amount, compounded daily.
The rule of thumb that trips people up: if you expect to owe $1,000 or more for the year, you generally need to make these payments.
But a steady side gig pulling in a few hundred dollars a month will.
A lot of new gig workers assume they can just pay everything next spring.
Then April arrives, their tax software spits out a $3,200 bill, and they don't have it.
The IRS does offer payment plans, but the interest keeps running while you pay it off.
If you also have a regular W-2 job, you can ask your employer to withhold extra from each paycheck by filing a new W-4.
That spreads the tax hit across the year instead of dropping it on you in one lump.
It's not glamorous, but it's the easiest fix available.
Another option: set aside 25% to 30% of every freelance payment the moment it hits your account.
Move it to a separate savings account you don't touch.
For most solo workers, that covers federal income tax plus the 15.3% self-employment tax that funds Social Security and Medicare.
If you're not sure whether you owe, the IRS has a free worksheet (Form 1040-ES) that walks you through the math.
TurboTax and FreeTaxUSA also offer free estimated tax calculators.
You can pay online through IRS Direct Pay in a few clicks, and the money comes straight from your bank account with no fee.
One more thing worth knowing: state taxes usually work the same way.
If you live in a state with income tax, you may owe estimated payments to your state too — on roughly the same schedule.
The people who get burned most often aren't tax cheats.
They're first-year freelancers who genuinely didn't know the rules.
A little planning in June beats a panic attack in April.
The honest truth is that the estimated tax system isn't designed to be friendly to gig workers — it assumes you know the rules before anyone tells you.
Final Thoughts
But once you set up a system, it's mostly automatic, and the penalty money stays in your pocket where it belongs.