If you made money on the side this year — freelance work, a rental property, a gig app, a little consulting — the IRS is expecting a payment from you soon.
The next estimated tax deadline is September 15, and it catches people off guard every single time.
Unlike a regular paycheck, nobody is withholding money for you.
If you wait until April to settle up, you may owe not just the tax but also a penalty for paying late.
That penalty is essentially interest the government charges for the months you held onto money you owed.
You generally need to pay estimated taxes if you expect to owe at least $1,000 for the year.
That threshold is lower than people assume, which is why a modest side hustle can suddenly create a tax bill.
The safest approach is to send in 100 percent of what you owed last year, divided across the four quarterly payments.
If your income jumped, you may need to pay more to avoid a surprise.
If your income dropped, paying last year's amount could mean you're overpaying and essentially lending the government your money interest-free.
Your payment options are simpler than they used to be.
You can pay online through IRS Direct Pay, use your IRS online account, or set up a payment through a tax software provider.
You can also mail a check with Form 1040-ES, though online is faster and gives you a receipt.
One move that saves a lot of headaches: increase the withholding on your regular job instead.
You can ask your employer for a new W-4 and have extra taken out each paycheck.
The IRS treats withholding as if it were paid evenly all year, so bumping it up late in the year can erase a penalty that quarterly payments might not fix in time.
If money is tight right now, do not just ignore the deadline.
Pay what you can, and look into an IRS installment plan, which lets you spread the balance over monthly payments.
It is not free, but it is usually cheaper than doing nothing.
Freelancers, rideshare drivers, and small business owners should also remember that estimated taxes cover Medicare and Social Security, not just income tax.
That self-employment tax is 15.3 percent on top of your regular rate, and it is the number that shocks people most when they file.
A quick way to avoid the whole mess next year: open a separate savings account and move a slice of every payment you receive into it.
When the quarterly deadline arrives, the money is already sitting there instead of coming out of this month's grocery budget.
The bottom line: September 15 is not a suggestion, and the IRS does not care that you forgot.
If you owe, pay something now rather than everything later.
Final Thoughts
A ten-minute payment today beats a penalty letter in the spring.