Estimated Tax Payments: Who Owes and When to Pay

If you are self-employed, a freelancer, an investor, or receive income that is not subject to withholding, you likely owe estimated taxes. Missing estimated tax payments can result in an underpayment penalty — even if you pay your full tax bill when you file. Here is how the system works.

Who Needs to Pay Estimated Taxes?

You must make estimated tax payments if you expect to owe at least $1,000 in federal taxes after subtracting withholding and credits, AND your withholding is less than the smaller of:

90% of your current year tax liability, or
100% of your prior year tax liability (110% if your prior year AGI exceeded $150,000)

Common taxpayers who owe estimated taxes:

Freelancers and self-employed individuals
Partners and S corporation shareholders
Rental income recipients
Investors with significant dividends or capital gains
Retirees with pension or retirement account distributions not covered by withholding

The 2026 Estimated Tax Due Dates

Estimated payments for the 2025 tax year were due:

April 15, 2025 (Q1: January 1 – March 31)
June 16, 2025 (Q2: April 1 – May 31)
September 15, 2025 (Q3: June 1 – August 31)
January 15, 2026 (Q4: September 1 – December 31)

For the 2026 tax year, the dates are:

April 15, 2026 (Q1)
June 16, 2026 (Q2)
September 15, 2026 (Q3)
January 15, 2027 (Q4)

How to Calculate Your Payment

The safest approach for most taxpayers is the safe harbor method: pay 100% of last year's tax liability spread across four equal quarterly payments (or 110% if your prior year AGI exceeded $150,000). This guarantees no underpayment penalty regardless of how your actual income varies.

For more accurate payments, estimate your current year income and multiply by your expected effective tax rate. Adjust each quarter as your income picture becomes clearer.

Self-employment note: Your estimated payments must cover both income tax and self-employment tax (15.3% on the first $168,600 of net self-employment income for 2024, plus 2.9% above that). The SE tax is substantial — do not forget it when calculating.

How to Pay

IRS Direct Pay: Free online payment from your bank account at IRS.gov. No registration required.

IRS EFTPS (Electronic Federal Tax Payment System): Free service that allows scheduling future payments. Requires advance enrollment (takes 5-7 business days to set up).

IRS2Go App: Mobile payments via Direct Pay.

Credit or debit card: Available through IRS-authorized third-party processors with a small convenience fee (1.85-1.98%).

Check: Mail with Form 1040-ES voucher. Allow processing time.

Applying Overpayments

If you overpay your estimated taxes, the IRS applies the overpayment to your final tax liability. Any remaining credit can be:

Applied to next year's estimated taxes
Refunded to you when you file

The Penalty for Underpayment

If you do not meet the safe harbor threshold, the IRS charges an underpayment penalty for each quarter where payments were insufficient. The penalty rate is the federal short-term rate plus 3% (currently around 7-8% annually), applied to the shortfall for each day of that quarter.

Importantly, the underpayment penalty is calculated per quarter — even if you make a large catch-up payment in Q4, you still owe the penalty for Q1-Q3 shortfalls.

Self-Employment and Estimated Taxes Together

Self-employed individuals use Schedule SE to calculate their SE tax liability and include it in their estimated payments. A common strategy is to calculate 30-35% of net self-employment income as a rough proxy for combined federal income tax and SE tax, then adjust based on your actual marginal rate.