If you’re self-employed, the IRS doesn’t wait until April to collect what you owe. Instead, it expects you to pay taxes throughout the year in four installments — a system known as quarterly estimated taxes. Miss a payment or underpay, and you can face penalties even if you settle the full balance by the annual deadline.
This guide walks through who needs to pay, how much, when, and exactly how to calculate and submit each payment.
What Are Quarterly Estimated Taxes?
Quarterly estimated taxes are advance payments toward your annual federal (and often state) tax bill. Because freelancers and other self-employed workers don’t have an employer withholding taxes from every paycheck, the IRS requires them to estimate their tax liability and pay it in four installments across the year instead of one lump sum in April.
These payments cover both:
- Income tax on your net self-employment earnings
- Self-employment tax (Social Security and Medicare, 15.3% combined)
Who Needs to Pay Them?
You generally need to make quarterly estimated payments if you expect to owe $1,000 or more in federal tax for the year after subtracting withholding and credits. In practice, this applies to almost anyone who freelances full-time or earns significant self-employment income on the side.
You may be exempt if:
- Your employer already withholds enough from a W-2 job to cover your total tax liability, including freelance income
- You had no tax liability at all in the previous year and were a U.S. citizen or resident for the full 12 months
If you’re unsure, it’s safer to calculate an estimate and pay something than to assume you’re exempt.
The 2025-2026 Due Dates
Estimated tax payments follow a fixed quarterly schedule (note that the «quarters» aren’t equal three-month periods):
| Payment | Period Covered | Due Date |
|---|---|---|
| Q1 | January 1 – March 31 | April 15 |
| Q2 | April 1 – May 31 | June 15 |
| Q3 | June 1 – August 31 | September 15 |
| Q4 | September 1 – December 31 | January 15 (following year) |
If a due date falls on a weekend or federal holiday, it shifts to the next business day. Mark these dates on a calendar with reminders a week in advance — missing even one deadline can trigger a penalty for that period, regardless of what you pay later.
How to Calculate Your Quarterly Payment
There are two common approaches:
Method 1: The Safe Harbor Rule
The simplest way to avoid penalties is to pay based on last year’s tax liability:
- If your adjusted gross income was $150,000 or less last year, pay at least 100% of last year’s total tax bill, split into four equal payments.
- If it was above $150,000, pay at least 110% of last year’s total tax bill.
As long as you meet this threshold, you generally won’t owe an underpayment penalty — even if you end up owing more when you file, because your income grew during the year.
Method 2: Estimating Based on Current-Year Income
If your income fluctuates significantly or this is your first year freelancing (so there’s no «last year» to base it on), estimate current-year taxes directly:
- Project your total net self-employment income for the year
- Subtract anticipated business deductions
- Calculate self-employment tax (15.3% on ~92.35% of net earnings)
- Estimate federal income tax based on your expected tax bracket
- Add state income tax if applicable
- Divide the total by four
This method takes more effort but is more accurate if your income is growing or highly variable month to month.
Example Calculation
A freelance copywriter expects $80,000 in net income this year, with no other income sources.
- Self-employment tax: approximately $11,304
- Federal income tax (estimated effective rate ~14%): approximately $11,200
- State income tax (assuming ~4%): approximately $3,200
Estimated annual tax liability: ~$25,700, meaning each quarterly payment would be roughly $6,425.
How to Actually Pay
The IRS offers several ways to submit estimated payments:
- IRS Direct Pay — free, pays directly from a bank account, no account creation required
- EFTPS (Electronic Federal Tax Payment System) — free, requires registration but useful if you want to schedule payments in advance
- IRS2Go app or debit/credit card through an approved processor (a small processing fee applies)
- By mail using Form 1040-ES payment vouchers, though electronic payment is faster and provides instant confirmation
Most tax software and many accounting platforms for freelancers can also calculate and schedule these payments automatically.
What Happens If You Underpay or Miss a Deadline?
The IRS charges an underpayment penalty, calculated as interest on the shortfall for each quarter it went unpaid. The penalty is generally modest for small or occasional shortfalls, but it compounds if you consistently underpay across multiple quarters. Filing your annual return doesn’t erase this penalty — it’s assessed separately, quarter by quarter.
If your income was uneven throughout the year (e.g., a big project landed in Q3), you can use the annualized income installment method on Form 2210 to reduce or eliminate penalties tied to quarters when you genuinely earned less.
Tips to Make This Easier Every Quarter
- Set aside your tax percentage from every payment you receive (see our guide on how much freelancers should save for taxes) so the cash is already there when each deadline arrives
- Recalculate each quarter if your income changes significantly — don’t just divide last year’s number by four and forget about it
- Keep a running log of income and expenses so your quarterly estimate is based on real numbers, not guesswork
- Automate reminders a week before each due date, not the day of
The Bottom Line
Quarterly estimated taxes aren’t optional for most freelancers — they’re a core part of running a self-employed business. The safest approach is the safe harbor method (100-110% of last year’s tax bill) if your income is relatively stable, or a direct calculation if it’s growing or unpredictable. Either way, consistency is what keeps you penalty-free: pay on time, every quarter, and adjust as your income evolves.
This article is for general informational purposes and isn’t personalized tax advice. Tax rules, rates, and deadlines can change — consult a licensed tax professional or CPA, or verify current figures directly on IRS.gov, before making payment decisions.