Pay-as-you-go taxes are the federal rule that you owe income tax as you earn money during the year, not in a single payment at filing time. You satisfy it one of two ways: your employer withholds tax from each paycheck, or you send the IRS quarterly estimated payments yourself. Most people do a mix of both. Get the amount roughly right and filing is uneventful. Underpay and you owe a penalty; overpay and you’ve handed the government an interest-free loan.
Withholding Handles It for Most Employees
Federal law requires every employer to deduct income tax from each paycheck before you see the money.1Office of the Law Revision Counsel. 26 USC 3402 – Income Tax Collected at Source The amount comes from the filing status and other details you gave on Form W-4 when you started the job.2Internal Revenue Service. About Form W-4, Employees Withholding Certificate Marriage, a new dependent, a second job, or a home purchase all change the math.
If your W-4 is outdated, your withholding drifts out of line with your actual liability. The IRS offers an online Tax Withholding Estimator that walks through your situation and generates a pre-filled W-4 you can hand to your employer.3Internal Revenue Service. Tax Withholding Estimator Running it once a year, ideally in January, keeps you off both ends of the spectrum.
Quarterly Estimated Payments for Self-Employed Income
If you freelance, contract, or run a small business, nobody withholds for you. You calculate and send quarterly estimated payments to the IRS on four fixed deadlines set by statute.4Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual to Pay Estimated Income Tax
For tax year 2026:5Taxpayer Advocate Service. Making Estimated Payments
- 1st quarter (Jan 1–Mar 31): April 15, 2026
- 2nd quarter (Apr 1–May 31): June 15, 2026
- 3rd quarter (Jun 1–Aug 31): September 15, 2026
- 4th quarter (Sep 1–Dec 31): January 15, 2027
Those periods are not true calendar quarters. The second one covers only two months, which trips up first-time filers.
Self-employed workers owe self-employment tax on top of income tax. The combined rate is 15.3%: 12.4% for Social Security and 2.9% for Medicare.6Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) That’s double what employees pay because you cover both the employee and employer shares. Factor it into your estimated payments alongside income tax.
Form 1040-ES contains a worksheet that walks you through projecting net earnings, applying tax rates, and splitting the result into four installments.7Internal Revenue Service. About Form 1040-ES, Estimated Tax for Individuals If your income arrives unevenly, you can use the annualized income installment method on Schedule AI to match payments to when you actually earn.
Which Income Triggers a Payment Obligation
Wages are only the beginning. Interest, dividends, capital gains, rental income, and self-employment earnings all count toward the pay-as-you-go obligation.8Internal Revenue Service. Estimated Taxes So do alimony, prizes, awards, and gambling winnings.9Internal Revenue Service. Pay As You Go, So You Wont Owe – A Guide to Withholding, Estimated Taxes and Ways to Avoid the Estimated Tax Penalty
The common scenario is a regular paycheck plus a side stream that isn’t withheld on: dividends, a rental, a freelance client. You can send an estimated payment for that quarter, or you can raise your W-4 withholding at your day job to cover the extra income. The second approach avoids quarterly filings altogether.
Safe Harbors That Keep You Penalty-Free
You avoid the underpayment penalty if you meet any one of three safe harbors:
- You owe less than $1,000 after subtracting withholding and estimated payments from your total tax.10Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty
- Your withholding and estimated payments covered at least 90% of what you actually owe for the current year.4Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual to Pay Estimated Income Tax
- You paid at least 100% of last year’s total tax, regardless of how much you owe this year.4Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual to Pay Estimated Income Tax
Your required annual payment is the smaller of the last two amounts. If 90% of this year’s tax is $9,000 and 100% of last year’s tax is $8,000, then $8,000 in total payments keeps you safe.
Higher Earners Face 110%
If your adjusted gross income for the prior year exceeded $150,000 ($75,000 if married filing separately), the prior-year safe harbor rises from 100% to 110%.4Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual to Pay Estimated Income Tax If you earned $200,000 last year and paid $40,000 in tax, your safe harbor for this year is $44,000, not $40,000.
How the Penalty Gets Calculated
The underpayment penalty is not a flat fee. The IRS computes it separately for each quarterly installment you missed or underpaid, applying a floating interest rate to the shortfall for the days it went unpaid. As of early 2026, that rate is 7% annually.11Internal Revenue Service. Quarterly Interest Rates The rate resets each quarter based on the federal short-term rate, so it can change mid-year. Payments you make are applied to the earliest unpaid installment first, even if you intended them for a later quarter.
How to Send Payments
IRS Direct Pay is the simplest route for most individuals. You pay directly from a checking or savings account with no registration and no fee, and you can schedule payments up to 365 days in advance.12Internal Revenue Service. Tax Time Guide – Use IRS Electronic Payment Options for Fast, Safe Service Scheduling all four quarterly payments at once is a common approach.
EFTPS remains the fuller-featured system for businesses and tax professionals, but individuals with a Social Security number can no longer create new EFTPS enrollments.13Internal Revenue Service. EFTPS – The Electronic Federal Tax Payment System If you already have an account, you can keep using it. Everyone else should use Direct Pay or their IRS Online Account.
You can still mail a check or money order with a Form 1040-ES voucher. The correct address depends on your state and is listed in the 1040-ES instructions.14Internal Revenue Service. Form 1040-ES Addresses for Taxpayers and Tax Professionals Paper takes longer to process, so send it well before the deadline.
Whichever method you use, keep the confirmation number or cancelled check. You need it to reconcile payments at filing time and to prove payment if the IRS ever disputes it.
If You Miss a Deadline or Overpay
A missed quarterly deadline is not a reason to skip the payment. The penalty accrues for every day the underpayment remains outstanding, so paying late still stops the clock sooner than waiting until you file.10Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty
The IRS waives the penalty in narrow situations. If you retired after reaching age 62 or became disabled during the current or prior tax year, and the underpayment resulted from reasonable cause, you can request a waiver on Form 2210. The same option exists if a casualty or federally declared disaster prevented timely payment.15Internal Revenue Service. Instructions for Form 2210 Attach documentation and an explanation to your return.
If your payments exceeded what you owed, you can take the overpayment as a refund or apply it toward next year’s estimated tax.16Internal Revenue Service. Estimated Tax Consistent large overpayments are a signal to revisit your projections or lower your W-4 withholding so the money stays with you until the IRS actually needs it.
Narrow Exceptions
Farmers and Fishermen
If at least two-thirds of your gross income comes from farming or fishing, you can skip the four-quarter schedule. A single estimated payment by January 15 avoids any penalty. File your return and pay everything owed by March 1 and you can skip estimated payments entirely.17Internal Revenue Service. Topic No. 416, Farming and Fishing Income The rule reflects that agricultural income arrives in lumps after harvest.
Retirees Receiving Social Security
Social Security benefits are not withheld on by default, but you can request it. You choose a flat rate of 7%, 10%, 12%, or 22% of your monthly benefit.18Social Security Administration. Request to Withhold Taxes If you also draw a pension, investment income, or part-time wages, voluntary Social Security withholding can cover the total liability and keep you off the quarterly estimated payment schedule.