If you are self-employed and expect to owe $1,000 or more in federal tax for the year after subtracting any withholding and refundable credits, yes, you have to pay taxes quarterly. Federal income tax is pay-as-you-go, and because no employer is withholding on your behalf, the job of sending money to the IRS throughout the year falls on you. Those payments cover both income tax and the self-employment tax that funds Social Security and Medicare.1Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual to Pay Estimated Income Tax
Who the Quarterly Rule Actually Covers
The $1,000 trigger is simple in principle. Estimate your total federal tax for the year, subtract withholding from any other income source and refundable credits, and if what’s left is $1,000 or more, quarterly payments apply. This covers freelancers, sole proprietors, independent contractors, and partners in a partnership.
A common misconception is that this only matters if self-employment is your only income. It doesn’t. If you have a W-2 job and earn $15,000 on the side, the tax on that side income can easily clear the $1,000 threshold on its own, and quarterly payments kick in.
There is a workaround worth knowing if you do have a salaried job. File a new W-4 with your employer and raise your federal withholding by enough to cover the tax on your self-employment income. The IRS treats withholding as paid evenly throughout the year, so bumping up each paycheck by a couple of hundred dollars can replace writing four separate estimated checks. The agency doesn’t care how the money arrives, only that enough arrives on time.
Safe Harbor: How Much Is Enough
You avoid an underpayment penalty as long as your combined withholding and estimated payments hit one of two benchmarks. You need to pay the lesser of:
- 90% of your current-year tax, or
- 100% of your prior-year tax (110% if your prior-year adjusted gross income was more than $150,000, or $75,000 if married filing separately).1Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual to Pay Estimated Income Tax
Most people rely on the prior-year figure because it’s already known. Pull the total tax line off last year’s return, divide by four, and pay that each quarter. Your income can jump substantially this year and you’ll still be protected.
The prior-year safe harbor isn’t available if you didn’t file a return for the previous year, or if that year covered fewer than 12 months. First-time self-employed filers have to aim for 90% of the current year, which means projecting income as carefully as you can.1Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual to Pay Estimated Income Tax
The Four Deadlines
The IRS divides the year into four uneven periods, each with its own due date:
- Period 1 (January 1 to March 31): Due April 15
- Period 2 (April 1 to May 31): Due June 15
- Period 3 (June 1 to August 31): Due September 15
- Period 4 (September 1 to December 31): Due January 15 of the following year
When a due date lands on a weekend or federal holiday, it shifts to the next business day.2Internal Revenue Service. Individuals 2 Timeliness is judged by the postmark for mailed payments and the electronic timestamp for online payments. The IRS occasionally extends deadlines for taxpayers in federally declared disaster areas, so keep an eye on announcements if that applies to you.
Calculating What You Owe
Form 1040-ES has a worksheet that walks you through projecting income, deductions, and credits to arrive at an estimated tax figure.3Internal Revenue Service. About Form 1040-ES, Estimated Tax for Individuals Last year’s return is a useful anchor, especially for recurring items like health insurance premiums or a home office deduction.
Self-employment tax is the piece that surprises most new freelancers. The rate is 12.4% for Social Security and 2.9% for Medicare on your net self-employment earnings, a combined 15.3%.4Office of the Law Revision Counsel. 26 USC 1401 – Rate of Tax The Social Security portion applies only up to $184,500 in net earnings for 2026.5Social Security Administration. Contribution and Benefit Base The Medicare portion has no cap. You can deduct half of the self-employment tax when calculating your adjusted gross income, which slightly lowers your income tax.
An additional 0.9% Medicare tax applies to net self-employment income above $200,000 ($250,000 for married filing jointly, $125,000 for married filing separately).6Internal Revenue Service. Topic No. 560, Additional Medicare Tax It’s easy to miss when estimating, and it creates an unpleasant surprise at filing time if you don’t build it in.
Sole proprietors and partners may also qualify for the qualified business income deduction, which allows up to 20% of net business income to be deducted before income tax is calculated. The deduction phases out at higher income levels and doesn’t apply to every type of business, so run it through the 1040-ES worksheet rather than assuming.
If your income shifts during the year, recalculate. The IRS instructs taxpayers to redo the 1040-ES worksheet whenever income rises or drops so remaining payments stay on track.7Internal Revenue Service. Estimated Taxes
How to Send the Payment
You can pay from a bank account, by card, or by mail. Each has trade-offs.
Bank Account
IRS Direct Pay is free and doesn’t require an account. It verifies your identity from a prior return, then processes a one-time payment after you enter your banking details and select “Estimated Tax” as the payment type.8Internal Revenue Service. Direct Pay with Bank Account You get a confirmation number as a receipt.
The Electronic Federal Tax Payment System (EFTPS) is the other free bank-account option and lets you schedule payments up to 365 days ahead, useful for setting up all four installments at once.9Internal Revenue Service. EFTPS: The Electronic Federal Tax Payment System As of October 2025, new individual enrollments through EFTPS.gov are no longer accepted, and existing individual users will be required to migrate away later in 2026.10Electronic Federal Tax Payment System. Welcome to EFTPS Online If you’re already enrolled, you can keep using it for now, but Direct Pay or the IRS Online Account are more future-proof for individuals.
Credit or Debit Card
The IRS uses two authorized processors, Pay1040 and ACI Payments, both of which charge convenience fees the IRS does not receive. Debit card fees run about $2.10 to $2.15 per transaction. Credit card fees are percentage-based, typically 1.75% to 1.85% of the payment.11Internal Revenue Service. Pay Your Taxes by Debit or Credit Card or Digital Wallet A flat couple of dollars on a debit card is reasonable. A $5,000 quarterly payment on a credit card at 1.85% costs an extra $92.50, and those fees add up across four quarters. If you’re chasing rewards, run the math first.
Form 1040-ES comes with four payment vouchers, one per quarter. Mail the appropriate voucher with a check or money order payable to “United States Treasury” and write your Social Security number on the payment. The mailing address depends on your state and is listed in the 1040-ES instructions.12Internal Revenue Service. Form 1040-ES (2026) Don’t staple the check to the voucher. Mailed payments count as timely as long as the envelope is postmarked by the due date.
When Your Income Swings Between Quarters
Four equal installments work fine when income is steady. They fall apart when you earn $40,000 in the first quarter and $8,000 in the second. Paying a quarter of your annual estimate each period can mean overpaying badly during slow months, or coming up short during peak months and triggering a penalty on earlier installments.
The annualized income installment method exists for this. Instead of four equal payments, each installment is based on the income you actually earned during that period. You complete Schedule AI (attached to Form 2210) and calculate what you’d owe if each period’s income were annualized over a full year. This often reduces or eliminates penalties for earlier quarters when earnings were low, even if later quarters were much higher.13Internal Revenue Service. Instructions for Form 2210 (2025) The trade-off is paperwork: you need to track income and deductions by period. For anyone whose earnings genuinely swing, the effort usually pays for itself.
What Happens If You Underpay
The IRS calls it an “addition to tax,” but it functions like interest on money you should have paid earlier. The penalty is calculated separately for each installment, running from that installment’s due date until you pay or until the annual return’s filing deadline, whichever comes first.1Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual to Pay Estimated Income Tax
The rate is the federal short-term rate plus three percentage points, adjusted each calendar quarter. For the first quarter of 2026 it’s 7%.14Internal Revenue Service. Quarterly Interest Rates Unlike regular IRS interest, the estimated tax penalty is not compounded daily.15Internal Revenue Service. 20.1.3 Estimated Tax Penalties For most self-employed taxpayers the dollar amount is modest relative to the tax owed, but it’s money spent for no return.
You usually don’t need to calculate the penalty yourself. If you underpay and nothing unusual applies, the IRS figures the penalty and sends you a bill. File Form 2210 only if you want to request a waiver, use the annualized income installment method, or treat withholding as paid on the actual dates it was withheld rather than spread evenly.16Internal Revenue Service. Form 2210 – Underpayment of Estimated Tax by Individuals, Estates, and Trusts
The IRS can waive the penalty in limited cases: taxpayers in a federally declared disaster area, those serving in a combat zone, taxpayers who retired after age 62 or became disabled during the tax year or the year before, and casualty or unusual circumstances where imposing the penalty would be against equity and good conscience.17Internal Revenue Service. Penalty Relief Due to Statutory Exception Requesting a waiver means checking box B in Part II of Form 2210 and filing it with your return.
Don’t Forget State Estimated Taxes
Federal payments are only half the picture. Most states with an income tax require their own estimated payments, and the thresholds are often lower than the federal $1,000 mark, generally ranging from $100 to $1,000 in expected tax. A handful of states use income-based rules instead. Deadlines usually mirror the federal schedule, but not always. Check your state revenue department’s site, because missing state estimated payments carries its own penalties, typically at interest rates between 7% and 11%.
A few states have no income tax, so none of this applies if you live in one. And at least one state with an income tax doesn’t require quarterly estimated payments at all. The point is not to assume your federal payments cover everything.