If no one is withholding federal tax from your income, the IRS expects you to send it in yourself through quarterly estimated tax payments. You project what you’ll owe for the year on Form 1040-ES, divide that number by four, and pay the IRS on a fixed schedule: April 15, June 15, September 15, and January 15 of the following year. Miss the threshold and you owe interest-based penalties on top of the tax.
Whether You Actually Need to Pay Quarterly
You need to make estimated payments if you expect to owe $1,000 or more in federal tax for the year after subtracting withholding and refundable credits.1Internal Revenue Service. How Do I Know if I Have To Make Quarterly Individual Estimated Tax Payments That covers sole proprietors, freelancers, partners, S corporation shareholders, and anyone with substantial investment, rental, or alimony income that isn’t running through a payroll system.
Two safe harbors protect you from underpayment penalties even if your income estimate turns out to be wrong. You avoid the penalty by paying at least 90% of what you actually owe for the current year, or 100% of what you owed last year, whichever is smaller.2Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual To Pay Estimated Income Tax If your prior-year adjusted gross income exceeded $150,000 (or $75,000 if married filing separately), the prior-year figure climbs to 110%.3Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty The prior-year safe harbor is easier to use because you already know the exact number.
Two groups are off the hook entirely. If you had zero tax liability last year and were a U.S. citizen or resident the whole year, you owe no estimated payments this year regardless of what you earn.2Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual To Pay Estimated Income Tax Farmers and fishermen who earn at least two-thirds of their gross income from farming or fishing can make a single January 15 payment, or skip estimated payments and file their return with full payment by March 1.4Internal Revenue Service. Farmers and Fishermen
Calculating What You Owe
Form 1040-ES has a worksheet that walks you through projecting the year’s total tax and dividing it into quarterly amounts.5Internal Revenue Service. About Form 1040-ES, Estimated Tax for Individuals Your prior year’s Form 1040 is the most reliable starting point for income, deductions, and credits.
Self-Employment Tax
If you work for yourself, you owe self-employment tax covering both halves of Social Security and Medicare. The combined rate is 15.3%, made up of 12.4% for Social Security and 2.9% for Medicare.6Internal Revenue Service. Topic No. 554, Self-Employment Tax The Social Security portion only applies to the first $184,500 of net earnings in 2026.7Social Security Administration. Contribution and Benefit Base Every dollar above that is still subject to the 2.9% Medicare tax, with no cap.
Higher earners also owe an additional 0.9% Medicare surtax on self-employment income above $200,000 for single filers or $250,000 for married joint filers.8Internal Revenue Service. Topic No. 560, Additional Medicare Tax This one is easy to miss when estimating and is a common reason high-earning freelancers underpay.
You apply the self-employment rates to 92.35% of your net profit rather than the full amount, and you deduct half of the self-employment tax when figuring adjusted gross income.9Internal Revenue Service. Form 1040-ES (2026)
Income Tax
After the self-employment adjustments, you calculate income tax on the remaining taxable income. For 2026, the standard deduction is $16,100 for single filers, $32,200 for joint filers, and $24,150 for heads of household.10Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026, Including Amendments From the One, Big, Beautiful Bill Use itemized deductions instead if they come out higher.
The 2026 brackets for single filers run 10% up to $12,400, 12% up to $50,400, 22% up to $105,700, 24% up to $201,775, 32% up to $256,225, 35% up to $640,600, and 37% above that. For joint filers each threshold roughly doubles.10Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026, Including Amendments From the One, Big, Beautiful Bill The 1040-ES worksheet also lets you factor in refundable credits like the Child Tax Credit and Earned Income Tax Credit. Divide the total by four, and that’s each quarter’s payment.
The Four Deadlines
The IRS splits the year into four uneven periods, each with its own due date:11Internal Revenue Service. When Are Quarterly Estimated Tax Payments Due
- Q1 income (January 1 through March 31): due April 15
- Q2 income (April 1 through May 31): due June 15
- Q3 income (June 1 through August 31): due September 15
- Q4 income (September 1 through December 31): due January 15 of the following year
For 2026, every deadline falls on a weekday, so none of them shift. When a due date lands on a weekend or federal holiday, the payment moves to the next business day.11Internal Revenue Service. When Are Quarterly Estimated Tax Payments Due The periods aren’t equal, but the dates are fixed regardless of how your income falls across the year.
There’s one shortcut. You can skip the January payment if you file your annual return and pay the full balance by January 31.2Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual To Pay Estimated Income Tax Useful if you keep clean records and can file quickly.
Adjusting Payments When Income Changes
Self-employment and investment income rarely arrive in tidy, predictable amounts. If your earnings spike or drop mid-year, you’re not stuck with the number you calculated in April. Redo the 1040-ES worksheet with updated figures and change your remaining payments to match.12Internal Revenue Service. Estimated Taxes
For genuinely seasonal income (a landscaper who earns most of the year’s revenue between April and September, for instance), the annualized income installment method recalculates each period’s required payment based on income earned up to that point rather than assuming an even spread. Complete Schedule AI with Form 2210 and attach it to your annual return.13Internal Revenue Service. Instructions for Form 2210 – Underpayment of Estimated Tax by Individuals, Estates, and Trusts The paperwork is heavier, but it can eliminate penalties that would otherwise hit for light payments during a slow quarter.
How to Send the Payment
Electronic methods confirm instantly and remove mail-delay risk. That matters most when you’re paying close to a deadline.
IRS Direct Pay
Direct Pay moves money from your checking or savings account to the IRS at no cost.14Internal Revenue Service. Direct Pay With Bank Account No account setup. You verify your identity using details from a prior return, choose the payment type and tax year, enter your bank information, and get a confirmation number on the spot. For most people this is the simplest option.
IRS Online Account
A free IRS Online Account adds a dashboard. You can pay from your bank, schedule payments up to 365 days ahead, cancel scheduled payments, and pull up five years of payment history including every estimated payment.15Internal Revenue Service. Online Account for Individuals The scheduling feature is well suited to estimated taxes because you can queue all four quarters at once and stop thinking about them.
Credit and Debit Cards
IRS-authorized third-party processors accept card payments, and they charge fees the IRS neither receives nor controls. Credit card fees run 1.75% to 1.85% of the payment with a $2.50 minimum; debit card fees are a flat $2.10 to $2.15.16Internal Revenue Service. Pay Your Taxes by Debit or Credit Card or Digital Wallet On a $5,000 payment, a 1.85% credit card fee costs $92.50, which wipes out the rewards benefit on most cards. Debit is far cheaper for larger amounts.
Check or Money Order
Paper still works. Use the payment voucher from Form 1040-ES for the quarter you’re paying; each voucher is preprinted with the correct due date.9Internal Revenue Service. Form 1040-ES (2026) Make the check payable to “U.S. Treasury” and write your Social Security number, the tax year, and “Form 1040-ES” on it.17Internal Revenue Service. Pay by Check or Money Order Mail it to the service center for your state, listed in the 1040-ES instructions. Send certified and keep the receipt. If the IRS says the payment never arrived, that receipt is your only proof of a timely payment.
Withholding Instead
If you also have a regular W-2 job, you can skip estimated payments and cover the extra tax through payroll. File a new Form W-4 with your employer and enter an additional withholding amount in Step 4(c).18Internal Revenue Service. Publication 505 (2025), Tax Withholding and Estimated Tax The IRS treats withholding as paid evenly across the year even if most of it comes from your last few paychecks, which can rescue you from penalties for light quarterly payments earlier in the year.
What Happens If You Underpay
The underpayment penalty isn’t a flat fine. It’s interest that compounds daily on whatever you were short. For the first quarter of 2026, the IRS charges 7% per year on underpayments; the rate dropped to 6% for the second quarter.19Internal Revenue Service. Quarterly Interest Rates The rate resets each quarter at the federal short-term rate plus three points, so it moves with broader interest rates.20Internal Revenue Service. Interest Rates Remain the Same for the First Quarter of 2026
The penalty is calculated separately for each quarter. If you paid Q1 and Q2 on time but missed Q3, interest only runs on the Q3 shortfall from the September deadline until you catch up. The IRS generally does this math and sends a notice, but you can compute it yourself on Form 2210.
Waivers are available in specific situations. If you retired after age 62 or became disabled during the tax year or the year before, and the underpayment was due to reasonable cause rather than neglect, check box B on Form 2210 and attach documentation. The same applies to casualties, disasters, and other unusual circumstances.2Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual To Pay Estimated Income Tax For federally declared disasters, the IRS usually grants relief automatically.
State Payments Are Separate
Federal estimated taxes only cover the federal side. Most states with an income tax run their own quarterly system on a similar schedule, and the thresholds, safe harbors, penalty rates, and deadlines vary. State triggers range from about $100 to $1,000, with $500 common. Check your state’s department of revenue for the specific rules. Assuming the federal framework covers everything is one of the more expensive mistakes people make in their first year of self-employment.