Estimated Quarterly Taxes: A Complete Guide
Last updated: February 2026 | Covers the 2026 tax year
Who Actually Has to File Quarterly
The IRS expects quarterly estimated tax payments (Form 1040-ES) from anyone who will owe $1,000 or more in federal tax beyond what's already withheld — which captures most self-employed filers, 1099 contractors, side-hustle earners, landlords, and retirees drawing income outside a paycheck. There are 5 estimated-tax due dates on the 2026 calendar, one for each quarter, and missing any of them triggers the IRS underpayment penalty calculated using the current federal short-term rate plus three percentage points. The penalty compounds, so late-year catch-ups do not eliminate earlier-quarter shortfalls.
This guide explains the safe-harbor rules (pay the lesser of 100% of last year's tax or 90% of this year's projected tax, 110% if last year's AGI exceeded $150,000), walks through the annualized-income method for uneven earnings, and shows how to combine W-2 withholding with 1040-ES payments when you have both kinds of income. It also covers the most common filing mistake — forgetting self-employment tax at 15.3% on top of income tax — which doubles many first-year freelancers' quarterly bills.
Source: IRS Publication 505 (Tax Withholding and Estimated Tax) · Scope: federal only; state estimated taxes follow separate rules · Always cross-check your own situation before filing IRS Publication 505 (Tax Withholding and Estimated Tax) · Scope: federal only; state estimated taxes follow separate rules · Always cross-check your own situation before filing
If you're self-employed, freelancing, or have income without tax withholding, you likely need to make quarterly estimated tax payments. Here's everything you need to know.
Who Needs to Pay Estimated Taxes?
You generally need to make estimated payments if:
- You expect to owe $1,000 or more in federal tax after subtracting withholding and credits
- You're self-employed, a freelancer, or an independent contractor
- You have significant income from investments, rental property, or other sources without withholding
- You're a partner or S-corporation shareholder
If you're a W-2 employee and your employer withholds enough tax, you probably don't need to worry about estimated payments.
2026 Due Dates
| Quarter | Income Period | Due Date |
|---|---|---|
| Q1 2026 | January 1 – March 31 | April 15, 2026 |
| Q2 2026 | April 1 – May 31 | June 15, 2026 |
| Q3 2026 | June 1 – August 31 | September 15, 2026 |
| Q4 2026 | September 1 – December 31 | January 15, 2027 |
Note: Q2 covers only 2 months (April–May), not 3. The IRS calendar is not evenly divided.
How to Calculate Your Payments
There are two safe harbor methods to avoid underpayment penalties:
- Current-year method: Pay at least 90% of your current-year tax liability, divided into 4 equal payments.
- Prior-year method: Pay 100% of your prior-year tax liability (110% if your AGI exceeded $150,000), divided into 4 equal payments. This is often easier since you already know last year's number.
Most self-employed filers use the prior-year method because it's simpler and eliminates guesswork.
Quick formula (prior-year method): Take your total tax from last year's return (Form 1040, line 24), divide by 4, and pay that amount each quarter. If your AGI last year exceeded $150,000, multiply by 110% first.
Don't Forget Self-Employment Tax
In addition to income tax, self-employed individuals owe self-employment tax (Social Security + Medicare) at 15.3% on net earnings up to the Social Security wage base ($176,100 for 2025), plus 2.9% Medicare on earnings above that. Your estimated payments should cover both income tax and self-employment tax.
How to Pay
- IRS Direct Pay (irs.gov/payments) — free bank transfer
- EFTPS (Electronic Federal Tax Payment System) — requires enrollment
- IRS2Go app — mobile payment
- Mail Form 1040-ES — paper voucher with check
Underpayment Penalties
If you don't pay enough through withholding and estimated payments, the IRS charges an underpayment penalty based on the federal short-term interest rate plus 3 percentage points (currently around 7-8%). The penalty is calculated on the underpaid amount for each quarter.
You can avoid the penalty by meeting either safe harbor: 90% of current-year tax or 100%/110% of prior-year tax.
Key Takeaways
- Pay quarterly if you expect to owe $1,000+ after withholding
- The prior-year safe harbor (100%/110% of last year's tax) is the simplest method
- Include self-employment tax in your estimates, not just income tax
- Use IRS Direct Pay for free, instant payment
- Penalty avoidance is easier than many people think — the safe harbors are generous
Source: IRS Form 1040-ES instructions and Publication 505. This guide is for informational purposes only and does not constitute tax advice.
Compiled by the " research team.