If you are self-employed, a freelancer, an investor, or anyone who earns income without employer tax withholding, the IRS expects you to pay taxes throughout the year — not just at April 15. These are called quarterly estimated taxes, and failing to make them on time results in penalties even if you pay everything you owe by the filing deadline. This guide explains who must pay, how to calculate the right amount, when to pay, and how to actually send the money.
Why Quarterly Estimated Taxes Exist
The U.S. tax system is “pay as you go.” For employees, this happens automatically through paycheck withholding. When you are self-employed or have significant income outside of employment — rental income, investment gains, alimony in some cases — no withholding happens automatically. The IRS requires you to estimate your annual tax liability and prepay it in four installments throughout the year.
Who Must Make Estimated Tax Payments?
You must make estimated tax payments if you expect to owe at least $1,000 in federal income tax for 2026, after subtracting withholding and credits, AND your withholding and credits cover less than:
- 90% of the tax shown on your 2026 return, OR
- 100% of the tax shown on your 2025 return (110% if your 2025 AGI was more than $150,000)
The second test — paying at least as much as last year’s tax — is called the “safe harbor.” If you prepay an amount equal to 100% (or 110%) of your prior year tax, you will owe no underpayment penalty regardless of how much you end up owing in total.
Common situations where estimated payments are required:
- Freelancers and independent contractors
- Self-employed business owners
- Gig economy workers (Uber, DoorDash, etc.)
- Investors with significant capital gains, dividends, or interest not covered by withholding
- Landlords with rental income
- Retirees with pension, IRA distributions, or Social Security not adequately withheld
- Anyone who receives a large bonus not covered by withholding
The 2026 Quarterly Due Dates
The IRS divides the year into four payment periods. Each period covers specific months:
- Payment 1: April 15, 2026 — covers January 1 through March 31
- Payment 2: June 16, 2026 — covers April 1 through May 31
- Payment 3: September 15, 2026 — covers June 1 through August 31
- Payment 4: January 15, 2027 — covers September 1 through December 31
Note that the periods are uneven — the second period covers only two months (April and May) while the first, third, and fourth cover three months each. This is a quirk of the tax code.
If a due date falls on a weekend or federal holiday, it moves to the next business day. That is why the June payment is on June 16 (June 15 is a Sunday in 2026).
How to Calculate Your Estimated Tax Payment
There are two main methods to calculate how much to pay each quarter.
Method 1: Annualized Income Method
You estimate your actual income and expenses for the full year, project your total tax liability, and divide by four. This is the most accurate approach and works well when your income is relatively stable.
Example:
- Projected net self-employment income: $90,000
- Self-employment tax: ~$12,728 (90,000 x 0.9235 x 0.153)
- SE tax deduction: ~$6,364 (half of SE tax)
- Adjusted gross income: $90,000 – $6,364 = $83,636
- Standard deduction (single, 2026): $15,000
- Taxable income: $68,636
- Income tax: approximately $10,600
- Total tax: $12,728 + $10,600 = $23,328
- Quarterly payment: $23,328 / 4 = $5,832 per quarter
Method 2: Prior Year Safe Harbor
Look at your 2025 total tax (line 24 on your 2025 Form 1040). Divide that number by four and pay that amount each quarter. If your 2025 AGI exceeded $150,000, multiply your 2025 total tax by 110% first, then divide by four.
This method guarantees you avoid the underpayment penalty regardless of whether you actually owe more or less in 2026. It is the simpler and lower-risk option when your income is similar to last year or you cannot easily estimate current-year income.
Form 1040-ES: The Estimated Tax Worksheet
IRS Form 1040-ES includes a worksheet that walks you through calculating your estimated tax using the annualized method. It accounts for expected income, deductions, self-employment tax, and credits. The form also includes payment vouchers you can mail with a check, though most people pay electronically.
You can download the current year’s 1040-ES from the IRS website. Many tax software programs also calculate and track estimated payments for you.
How to Make Estimated Tax Payments
IRS Direct Pay
The fastest and simplest option. Go to the IRS Direct Pay page, choose “Estimated Tax” as the reason for payment, and pay directly from your bank account. No registration is required. There is no fee. Payments are processed same-day or next-day.
EFTPS (Electronic Federal Tax Payment System)
The Electronic Federal Tax Payment System is a free IRS service that requires advance enrollment (takes a few days to receive your PIN by mail). Once enrolled, you can schedule payments in advance, set up recurring payments, and view your payment history. This is the preferred method for business owners who want to automate quarterly payments.
IRS2Go App
The IRS’s official mobile app lets you make Direct Pay payments from your phone. Same functionality as the website, optimized for mobile.
Check or Money Order
You can mail a check or money order with the payment voucher from Form 1040-ES. Make the check payable to “United States Treasury,” write your Social Security number and “2026 Form 1040-ES” on the memo line. Mail by the due date (postmark counts). This is the slowest method and easiest to lose track of.
Credit Card
The IRS accepts credit card payments through authorized third-party processors, but they charge a convenience fee (typically 1.75% to 2%). Given that credit card rewards rarely exceed 2%, this is generally not cost-effective.
Adjusting Payments Mid-Year
Estimated tax payments do not have to be equal. If your income changes significantly during the year, you can adjust future payments. Had a great quarter? Increase next quarter’s payment. Had a slow quarter? Reduce it. What matters is that you avoid the underpayment penalty overall.
The IRS calculates underpayment penalties by period, so catching up later in the year does not eliminate earlier-period penalties. If you significantly underpaid in the first quarter, a large payment in the fourth quarter will not make that first-quarter underpayment go away.
Underpayment Penalty: What It Costs You
If you do not pay enough throughout the year, the IRS charges an underpayment penalty. For 2026, the rate is the federal short-term interest rate plus 3 percentage points (this rate changes quarterly). Based on recent rates, this works out to roughly 7-8% annualized, though the IRS only applies it to the underpaid amount for the number of days it was underpaid.
The penalty is calculated on Form 2210. Most tax software computes it automatically. You can avoid the penalty entirely by meeting either the 90% current-year test or the 100%/110% prior-year safe harbor.
Estimated Taxes and State Returns
Most states that have an income tax also require quarterly estimated payments on the same or similar schedule as the federal government. State underpayment penalties also apply.
California, New York, New Jersey, and other states with significant income taxes have their own estimated payment forms and online payment systems. Some states use the same due dates as the IRS; others have slightly different schedules. Check your state’s department of revenue website for the current year’s rules.
Coordinating Estimated Taxes With Withholding
If you have both self-employment income and a day job, your W-2 withholding counts toward covering your total tax liability. You may be able to reduce or eliminate estimated payments by asking your employer to withhold extra federal income tax from each paycheck (using Form W-4).
Because W-2 withholding is treated as paid evenly throughout the year regardless of when it is withheld, some people strategically increase withholding at year-end to make up a shortfall without triggering per-period underpayment penalties.
Tracking Estimated Payments
Keep records of every estimated payment you make: the date, the amount, and the confirmation number if paying electronically. You will need to report these on your Form 1040 (Schedule 3, Line 6) to get credit for them. The IRS also keeps records, but discrepancies can cause problems, so maintain your own.
A simple spreadsheet with columns for date, payment amount, confirmation number, and payment method works well. Some accounting tools like QuickBooks Self-Employed and Wave track estimated payments automatically.
Key Takeaways
- Pay quarterly estimated taxes if you expect to owe $1,000 or more for 2026.
- Due dates are April 15, June 16, September 15, 2026, and January 15, 2027.
- Use either the annualized method or the prior-year safe harbor to determine your payment amounts.
- Pay via IRS Direct Pay or EFTPS for the easiest, fastest, and most trackable experience.
- Adjust payments as your income changes throughout the year.
- State estimated taxes may also be required — check your state’s rules.
Quarterly estimated taxes are one of the most straightforward parts of self-employment once you understand the system. The two safe harbor methods take the guesswork out of the calculation, and the IRS makes electronic payment easier than ever. Build the habit early, set calendar reminders for each due date, and your tax bill at April 15 will rarely come as a surprise.