What estimated quarterly taxes are and why they exist
Estimated quarterly taxes are payments you send to the IRS four times a year if you don't have taxes withheld from a paycheck. The IRS doesn't wait until April 15 to collect — it wants money throughout the year, in roughly equal chunks due in April, June, September, and January.
If you're self-employed, a freelancer, a gig worker, or you earn significant income outside a W-2 job, you probably owe estimated taxes. The IRS assumes you'll owe something and expects you to pay as you earn, the same way an employer withholds from a regular paycheck. If you don't pay quarterly, you can face penalties and interest when you file your return, even if you end up getting a refund.
The system exists because the IRS collects tax revenue throughout the year, not in one lump sum on tax day. For people with W-2 jobs, their employer handles this automatically. For everyone else, you handle it yourself.
Key Takeaways
- Estimated quarterly taxes are four annual payments due April 15, June 15, September 15, and January 15 of the following year.
- You owe estimated taxes if you're self-employed, a contractor, a gig worker, or earn more than a small threshold from sources without withholding.
- The IRS provides Form 1040-ES to help you calculate what you owe based on your expected annual income.
- Underpayment penalties explore if you don't pay enough throughout the year, even if you get a refund when you file your return.
- You can adjust your quarterly payments if your income changes, and you don't have to pay if your expected tax liability is under a certain amount.
Who has to pay estimated quarterly taxes
You need to pay estimated taxes if you expect to owe $1,000 or more in federal income tax for the year after subtracting any withholding and tax credits. This applies to self-employed people, independent contractors, freelancers, and anyone with significant income from rental properties, investments, or side work.
If you have a W-2 job and also do freelance work on the side, you may owe estimated taxes on the freelance income. If you have two W-2 jobs and your combined withholding isn't enough, you might owe estimated taxes on the gap. Gig workers — people who drive for rideshare services, deliver food, or work through platforms like Upwork — almost always owe estimated taxes because these platforms don't withhold.
You don't owe estimated taxes if your expected tax liability is under $1,000, or if you expect to owe no federal income tax for the year. Some people also don't owe if they had no tax liability the previous year and are a U.S. citizen or resident alien for the whole year.
How to calculate what you owe
The IRS provides Form 1040-ES, which includes a worksheet to estimate your tax liability for the year. You'll need to project your total income, subtract deductions, and calculate the tax on what's left. The form then tells you how much to pay each quarter — usually one-fourth of your annual estimate, though the payments don't have to be equal if your income is uneven.
Start by estimating your gross income for the year. If you're self-employed, subtract business expenses and the self-employment tax deduction to get your taxable income. Then use the tax tables or the worksheet in Form 1040-ES to find your federal income tax. Add self-employment tax (Social Security and Medicare taxes for self-employed people), which is roughly 15.3% of your net self-employment income. Subtract any tax credits you expect to claim, like the Earned Income Tax Credit.
If your income is hard to predict — say you're a seasonal worker or your freelance work fluctuates — you can use last year's tax return as a starting point and adjust upward or downward. You can also recalculate and adjust your payments if your income changes partway through the year. Many people pay the same amount each quarter for simplicity, then settle up when they file their return.
The four payment due dates and how to pay
Estimated tax payments are due on the 15th of April, June, September, and January. If the 15th falls on a weekend or holiday, the important date moves to the next business day. These dates don't align with the calendar year — the January payment is for income earned in the previous year and is due when you file your return.
You can pay online through the IRS website using the Electronic Federal Tax Payment System (EFTPS), by credit or debit card through an IRS-approved payment processor, by mail using Form 1040-ES vouchers, or by phone. EFTPS is free and lets you schedule payments in advance. Credit card payments charge a processing fee, usually 1.5% to 2% of the payment amount. Mail payments take longer and are riskier — the IRS dates payments by postmark, so send them early.
When you pay, you'll need your Social Security number or employer identification number (EIN), your filing status, and the tax year. Keep records of every payment you make. The IRS will credit them to your account, and when you file your return, you'll report the total you paid and get credit for it.
What happens if you underpay or miss a payment
If you don't pay enough estimated tax throughout the year, the IRS charges underpayment penalties and interest on the shortfall. The penalty rate changes quarterly and is based on the federal short-term interest rate plus 3%. Even if you end up getting a refund when you file your return, you can still owe a penalty for underpaying during the year.
The IRS is somewhat flexible about underpayment. You don't face a penalty if you pay 90% of your current year's tax liability or 100% of your previous year's tax liability, whichever is smaller. If your previous year's income was over $150,000, the threshold is 110% instead of 100%. This means if you had a low-income year last year and a high-income year this year, you might owe a penalty even if you paid based on last year's return.
If you miss a payment entirely, the penalty is steeper. The best move is to pay what you can as soon as you realize you've missed a important date. The IRS will calculate the penalty based on how long the money was late, so paying when ready reduces the damage.
Adjusting your payments if your income changes
You don't have to stick with your original estimate if your income changes. If you earn more than you expected, you can increase your next quarterly payment to avoid a large bill at tax time. If you earn less, you can reduce your payments or skip one entirely. You recalculate using the same Form 1040-ES worksheet, plugging in your new income projection.
This flexibility is especially useful for seasonal workers or people whose income is unpredictable. A contractor who has a slow winter and a busy summer can pay less in the first two quarters and more in the last two. A freelancer who lands a big project partway through the year can adjust upward. You're not locked into your original estimate.
When you file your return, you'll report all the estimated tax payments you made during the year. If you overpaid, you get a refund or can explore the overpayment to next year's taxes. If you underpaid, you owe the difference plus any penalties.
The difference between estimated taxes and self-employment tax
Self-employment tax and estimated income tax are two separate things, and both explore to self-employed people. Self-employment tax is Social Security and Medicare tax — roughly 15.3% of your net self-employment income. Estimated income tax is federal income tax on your profit, which varies based on your tax bracket and deductions.
When you calculate your estimated quarterly payment using Form 1040-ES, you're including both. The form asks you to estimate your total tax liability, which includes federal income tax, self-employment tax, and any other taxes you owe. You pay the combined amount in one quarterly payment. When you file your return, you'll report both separately, but you pay them together throughout the year.
Frequently Asked Questions
Do I owe estimated taxes if I have a W-2 job and do freelance work on the side?
Only if your expected tax liability from the freelance income is $1,000 or more after accounting for withholding from your W-2 job. If your W-2 employer withholds enough to cover your total tax bill, you won't owe estimated taxes. You can adjust your W-4 with your employer to increase withholding instead of paying estimated taxes separately.
What if I can't afford to pay my estimated taxes on time?
Pay what you can as soon as possible. The IRS charges interest and penalties based on how long the money is late, so even a partial payment reduces the total you'll owe. You can also set up a payment plan with the IRS if you owe a large amount. Contact the IRS or work with a tax professional to discuss your options.
Can I pay estimated taxes monthly instead of quarterly?
The IRS requires quarterly payments on specific dates. You can't change the schedule to monthly. However, you can pay more than one quarter's amount at once if you want to get ahead, or you can pay early without penalty.
What if my income drops to zero partway through the year?
Recalculate your estimated tax using your new income projection and adjust your remaining payments. If you've already paid more than you owe, you'll get the overpayment back when you file your return. You can also skip remaining payments if your new estimate shows you won't owe $1,000 or more.
Do I need to file a return if I only have self-employment income and no employees?
Yes, you must file a return if your net self-employment income is $400 or more, regardless of your total income. This is true even if you don't owe federal income tax, because you owe self-employment tax. Filing also lets you claim deductions and credits that may reduce what you owe.