Estimated Tax Guide
The U.S. tax system is pay-as-you-go. If you have significant income that isn't subject to withholding — such as investment gains, dividends, freelance income, or rental income — you may need to pay estimated taxes quarterly to avoid penalties.
Estimated tax payments are due four times per year: April 15 (for January-March income), June 15 (April-May), September 15 (June-August), and January 15 of the following year (September-December). If you miss a payment or underpay, the IRS charges a penalty based on the federal short-term rate plus 3%, calculated from the due date of each payment.
For example, suppose you're a freelance graphic designer earning $80,000 per year and you also sold stock for a $30,000 gain in March. You haven't had any withholding. To avoid the penalty, you need to pay at least 90% of the current year's tax or 100% of the previous year's tax (110% if your prior year AGI was over $150,000) through a combination of withholding and quarterly payments. If your total tax is $25,000, you must pay at least $22,500 throughout the year.
One powerful strategy: increase your W-2 withholding at the end of the year rather than making quarterly payments. Withholding is treated as paid evenly throughout the year regardless of when it's actually withheld. If you realize a large gain in December, you could increase your December withholding to cover the tax, avoiding the need for estimated payments and the penalty altogether.
How to Calculate Estimated Payments
Use Form 1040-ES. Estimate your adjusted gross income, subtract deductions and credits, compute the tax, and subtract any withholding. Divide the remaining amount by 4 for equal payments. If your income is lumpy (like capital gains), you can use the annualized installment method (Form 2210, Schedule AI) to pay only when income is received.
FAQs
Who needs to pay estimated taxes?
You generally need to pay estimated taxes if you expect to owe at least $1,000 in tax after subtracting withholding and credits. This applies to investors with large capital gains, self-employed individuals, independent contractors, landlords, and anyone with significant non-wage income. If you had a tax liability last year, you're generally expected to have paid at least that amount this year.
What happens if I underpay?
The IRS charges a penalty based on the amount underpaid and the number of days late. The rate is the federal short-term rate plus 3%, calculated quarterly. You may qualify for a waiver if the underpayment was due to casualty, disaster, or other unusual circumstances, or if you retired or became disabled during the year.
Can I pay estimated taxes online?
Yes. The IRS offers Direct Pay (free, from a bank account), the Electronic Federal Tax Payment System (EFTPS), and debit/credit card payments through third-party processors (with fees). State tax agencies typically have their own online payment systems as well.