What Are Quarterly Estimated Taxes
Quarterly estimated taxes are four tax payments made throughout the year by freelancers, small business owners, and investors to prepay taxes on income that isn't subject to employer withholding — skipping them leads to IRS penalties.
Quarterly estimated taxes (officially called "estimated tax payments") are prepayments of federal income tax made four times a year by individuals who have significant income not subject to employer withholding. This includes self-employed people, freelancers, sole proprietors, partners in partnerships, S corporation shareholders, and investors with substantial taxable investment income.
The U.S. tax system is pay-as-you-go — taxes are supposed to be paid throughout the year, not all at once at filing. For employees, employers handle this automatically through payroll withholding. For everyone else, estimated tax payments fill that role.
2025 Quarterly Estimated Tax Due Dates
The four "quarters" aren't equal calendar quarters — they're IRS-defined periods:
| Payment | Income Period | Due Date |
|---|---|---|
| Q1 | Jan 1 – Mar 31 | April 15, 2025 |
| Q2 | Apr 1 – May 31 | June 16, 2025 |
| Q3 | Jun 1 – Aug 31 | September 15, 2025 |
| Q4 | Sep 1 – Dec 31 | January 15, 2026 |
If a due date falls on a weekend or federal holiday, it moves to the next business day.
Who Must Make Estimated Payments
You generally must make estimated tax payments if you expect:
- You will owe at least $1,000 in federal income tax after subtracting withholding and credits
- Your withholding and credits will cover less than 90% of your current year tax OR less than 100% of last year's tax (110% if your prior-year AGI exceeded $150,000)
If any of the safe-harbor conditions are met, no underpayment penalty applies even if you owe at filing.
How to Calculate Estimated Payments
Method 1: Safe harbor based on prior year Pay 100% of last year's tax in four equal installments (110% if AGI was above $150,000). This is the simplest approach — it guarantees no penalty regardless of what you actually earn this year.
Method 2: Estimate this year's actual tax
- Estimate your total taxable income for the year
- Calculate your expected tax using current tax brackets
- Subtract withholding (if any) and credits
- Divide the remainder by 4 and pay each quarter
Method 3: Annualized income installment method If your income is seasonal or highly uneven through the year, this method (Form 2210 Schedule AI) calculates each quarter's payment based on actual income earned in that period. It's more complex but avoids overpaying in early quarters.
How to Pay
Options for paying estimated taxes:
- IRS Direct Pay at irs.gov (free bank transfer)
- IRS2Go app
- Electronic Federal Tax Payment System (EFTPS) — free, requires advance enrollment
- Credit/debit card — convenience fees apply
- Check mailed with Form 1040-ES voucher
The Underpayment Penalty
If you don't pay enough estimated taxes through withholding and quarterly payments, the IRS assesses an underpayment penalty — even if you pay your full balance when you file. The penalty is calculated on the shortfall for each quarter and uses the federal short-term interest rate plus 3% (currently around 7–8% annualized).
The penalty can be reduced or eliminated if:
- You meet one of the safe harbor tests described above
- Your underpayment was due to a federally declared disaster
- You retired after age 62 or became disabled in the current or prior year and the underpayment was due to reasonable cause
Self-employed workers should also remember that self-employment tax (15.3% on net earnings) must be included in estimated payment calculations — not just income tax. This is often the biggest surprise for new freelancers.