Carlos is a self-employed electrician. Every April the same thing happened to him: he filed, discovered he owed several thousand, and after the debt appeared an extra line he didn’t understand: underpayment of estimated tax penalty. “But I’m paying what I owe,” he thought. “Yes,” the preparer told him, “but you paid it late.”
The IRS doesn’t work like an account you settle in April. It works like a pay-as-you-go system: the tax is owed during the year, not at the end. Employees pay it with withholding from each paycheck; those who work for themselves pay it with quarterly estimated payments. If you’re in the second group, this article is your manual.
Who must make estimated payments
The IRS’s practical rule: you must make estimated payments if you expect to owe $1,000 or more in taxes for the year, after subtracting withholding and credits. In practice, this includes almost everyone who works for themselves regularly: freelancers, contractors, app drivers, small business owners.
It also applies if you have income without sufficient withholding: interest, dividends, capital gains, rents, or pensions without adequate withholding. And it applies at both levels: federal and, in most states, state too.
There’s one total exception: if you owed no tax last year (your total tax was zero) and you were a citizen or resident the whole year, you generally don’t have to make estimated payments this year.
The four dates (and the April trap)
Payments are made four times a year, on these dates:
- April 15 — first payment of the current year
- June 15 — second payment
- September 15 — third payment
- January 15 of the following year — fourth and final payment
If a date falls on a weekend or holiday, it moves to the next business day.
The mental trap is April 15: that day two things come due at once: last year’s return and the current year’s first estimated payment. April is the heaviest month of the tax calendar, and that’s why experienced contractors plan from March. Our key dates guide for the season puts it on a calendar for the fridge.
How it’s paid: two routes
Form 1040-ES. It’s the estimated payments form. It comes with a worksheet to calculate how much you must pay each quarter based on your expected income, deductions, and credits. You can fill it out on paper and pay by check, but most people use the second route.
Online. The IRS accepts direct electronic payments (Direct Pay from your bank account), card payments (through authorized processors, with a fee), and the electronic payment system for businesses. Online is faster, you get immediate confirmation, and you can schedule payments in advance.
The safe harbor: how to avoid the penalty for sure
The 1040-ES is still useful as a worksheet to know how much to pay, even if you make the payment digitally. The IRS offers a safe harbor, a rule that, if you meet it, guarantees there will be no penalty even if you end up owing more than expected. For individuals, you’re safe if you pay at least 90% of the current year’s tax, or 100% of the prior year’s total tax (it goes up to 110% if your prior year’s adjusted gross income exceeded $150,000).
The second option is accountants’ favorite: if you paid $6,000 of federal tax last year, you pay $6,000 in four installments of $1,500, and there’s no penalty no matter what happens with your current income. It’s simple, predictable, and eliminates the guesswork.
The penalty: how it’s calculated (and why it hurts quarter by quarter)
The underpayment penalty is calculated per quarter, not just at the end of the year. This means paying everything together in December doesn’t save you: the IRS checks whether you paid enough in each period. Each quarter with insufficient payment generates its own penalty, calculated with the interest rate the IRS publishes each quarter.
In practice, the penalty is usually modest compared to the tax, but it’s money given away for something avoidable. And there is relief: the IRS can forgive the penalty in cases of disaster, recent retirement (after age 62), or disability, and if you ask them to review it with reasonable cause.
What to do today, in order
- Estimate whether you must make payments: do you expect to owe $1,000 or more this year after withholding?
- Use the Form 1040-ES worksheet (or the prior year’s safe harbor) to calculate your quarterly amount.
- Schedule the four payments on the calendar: April, June, September, January.
- If you’re already late on a quarter, pay as soon as possible: the penalty is calculated by days of delay.
Official sources
This content is informational and is not tax advice. For your particular case, consult the official sources or an authorized professional.
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