If you're self-employed, freelancing, or earning money from side gigs, the IRS doesn't wait until April to get its cut.
Estimated tax payments are due four times a year, and the next deadline is already creeping up.
Miss it, and you could be handing over extra money in penalties without even realizing it.
When you have a regular job, your employer withholds taxes from every paycheck.
But when you work for yourself or earn untaxed income, nobody is setting that money aside for you.
The IRS expects you to pay as you go, typically in quarterly installments, so you're not hit with one massive bill in the spring.
The deadlines are not evenly spaced, which trips people up every year.
For 2025, the due dates fall on April 15, June 16, September 15, and January 15, 2026.
That gap between September and January is longer than the others, which is why some folks get caught off guard when the new year starts.
One of the biggest mistakes is assuming you only owe taxes if you get a 1099 form.
Side hustle income counts even when nobody sends you paperwork.
Selling items online, driving for a rideshare app, tutoring, or earning interest on savings can all push you over the threshold where quarterly payments make sense.
If you expect to owe at least $1,000 in taxes after subtracting your withholding, the IRS generally wants you paying quarterly.
You can also avoid a penalty if you pay at least 90% of this year's tax bill or 100% of last year's, whichever is smaller.
Higher earners may need to cover 110% of last year's amount.
Most people take last year's total tax, divide by four, and adjust from there.
If your income jumped this year, that estimate could leave you short.
A quick check with tax software or a calculator can save you from a nasty surprise later.
Penalties for underpaying are not dramatic, but they add up.
The IRS charges interest on the amount you should have paid, and the rate moves with the market.
In recent years it has hovered around 7% to 8% annually, which is more than most savings accounts pay you.
Paying late means you're essentially borrowing at a worse rate than you'd get almost anywhere else.
There are a few ways to stay ahead of this.
You can make payments online through IRS Direct Pay or your IRS online account, set calendar reminders for each deadline, or ask your accountant to handle it.
Some people simply increase their withholding at a regular job to cover side income, which keeps things automatic.
If you realize you've missed a payment, don't panic.
Sending money as soon as you can reduces the interest that piles up.
You can also request a payment plan if the full amount isn't doable right now.
If money is coming in without taxes being taken out, the IRS still wants its share, and it wants it on a schedule.
Setting aside a chunk of each payment you receive, rather than scrambling at deadline time, turns a stressful chore into a routine.
Final Thoughts
A few minutes of planning now beats a penalty later.