What Are Quarterly Estimated Taxes, and How Do You Avoid an $8K Surprise?

Self-employed people owe estimated taxes four times a year: April 15, June 15, September 15, and January 15. Skip them and you get a penalty, even if you pay in full in April. The penalty-proof amount is 100% of last year’s tax in four equal payments (110% if you earned over $150K). In your first year, use 25 to 30 percent of net income.

Run your own numbers: free quarterly tax estimator, 2026 rates.

Every few months, a Reddit post like this goes semi-viral: “Self-employed for 4 years, just got hit with an $8,000 IRS penalty.” The comments are always part sympathy, part “yeah, you were supposed to pay quarterly.” And the poster is always furious, and who can blame them? No one ever told them. So let’s be the ones who tell you.

Why this is even a thing

When you have a W-2 job, your employer sends part of every paycheck to the IRS for you, all year long. By the time you file, the bill is mostly paid. The IRS loves that pay-as-you-go rhythm.

So when you’re self-employed and nobody takes tax out for you, they expect you to do it yourself, four times a year. That’s estimated taxes. Skip them, and the IRS doesn’t just want the tax. They add an underpayment penalty. It’s basically interest for making them wait. That’s how a normal bill quietly becomes an $8K punch in the gut. (If the whole 1099 thing is new, start with going from W-2 to 1099.)

The four dates to burn into your brain

For the 2026 tax year, estimated payments are due:

• April 15, 2026 (Q1)
• June 15, 2026 (Q2)
• September 15, 2026 (Q3)
• January 15, 2027 (Q4)

Yes, the “quarters” are weird and uneven. Just know the dates. If one lands on a weekend or holiday, it moves to the next business day.

How much do I actually send?

Here’s the shortcut the pros use. You don’t have to guess your income perfectly. You just have to hit one of two “safe harbors,” and the penalty goes away:

• Pay 90% of what you’ll owe this year, OR
• Pay 100% of what you owed last year (110% if your income was over $150K)

That second one is the shortcut. Say last year’s total tax was $12,000. Split it into four $3,000 payments. Send them on the dates above. Now you’re penalty-proof, even if you have a huge year. You’ll pay the rest in April, but no penalty.

Brand new, with no “last year” to go on? Use the set-aside method. Save 25-30% of your net income (income minus business expenses). Pay a quarter of your running estimate at each deadline. If you rent a booth or suite, your rent and supplies are deductions that shrink that number.

How to actually pay it

• IRS Direct Pay — free, straight from your bank account at irs.gov.
• EFTPS — the IRS’s payment system. Good if you want all your payments in one place.

Don’t forget: your state usually wants estimated payments too, on a similar schedule. People remember the IRS and get surprised by the state bill. Check yours.

The mistake that makes it worse

Lots of people do know about quarterly taxes. But they guess wildly, underpay all year, and still get a penalty. Or they overpay and give the government a free loan while they’re broke. Both happen for the same reason: you can’t pay the right amount if you don’t know what you’re making and spending in real time. Quarterly taxes aren’t hard math. They’re a tracking problem in a math costume.