The estimated tax penalty: a 2026 guide for the self‑employed
Arielle ContrerasArielle is a freelance writer who’s covered a range of topics including publishing, public transit accessibility, and freelance taxes. Her work has appeared in Electric Literature and She Writes and has been featured in Capital Currents. Arielle spends her free time on nature trails, thinking about what she’s going to cook for dinner and what she’ll write next.
Reviewed bya tax professionalThis content has been reviewed by an Enrolled Agent (EA) with the IRS — the highest credential awarded by the agency. Enrolled Agents are empowered to represent all taxpayers before the IRS, on all types of tax-related matters. Accountants who earn this certification have passed a comprehensive three-part exam on individual and business tax returns. To maintain EA status, they must stay up to date in the field by completing 72 hours of continuing education every three years.
Krislyn ChanKrislyn is Chief Growth Officer at Keeper. At Keeper, she strives to make expert-level tax strategies that used to require a traditional CPA accessible to all. Prior to Keeper, she was at Curology, where she helped bring custom, prescription-grade skincare out of the dermatologist's office to millions of faces.
Key takeaways
- Who owes quarterly taxes: freelancers, 1099 contractors, and anyone else who expects to owe $1,000 or more after withholding. 2026 payments are due April 15, June 15, and September 15, 2026, and January 15, 2027.
- What the penalty is: interest the IRS charges on each payment you missed or paid short, at 7% a year in 2026 (6% from April through June). Skipping all four 2026 payments costs about 4% of your year’s tax if you pay in full on April 15, 2027.
- How to avoid it: meet the safe harbor by paying the smaller of 90% of this year’s tax or 100% of last year’s (110% if your AGI was over $150,000), split into four on-time payments.
- If you miss a payment: pay as soon as you can. The penalty grows every day the payment is late, and a bigger payment next quarter won’t erase what’s already built up.
- When it can be waived: after a disaster, casualty, or other unusual hardship, or if you retired after 62 or became disabled that year or the year before. First-time penalty abatement doesn’t apply.
What is the estimated tax penalty?
The estimated tax penalty, which the IRS calls the underpayment of estimated tax penalty, is what you owe when you don’t pay enough tax during the year.
The IRS expects you to pay tax as you earn income, not in one lump sum when you file. That’s what the IRS means when it calls the tax system “pay-as-you-go.” W-2 employees do this automatically, because their employer withholds tax from every paycheck. Freelancers, 1099 contractors, and business owners don’t have an employer doing that for them, so they pay through quarterly estimated tax payments instead.
The penalty is figured separately for each of the four installments. Each one that was short accrues a charge every day at the IRS underpayment rate, from its due date until you pay it or until the return’s April due date, whichever comes first. That’s why a bigger payment later in the year doesn’t erase an earlier miss, and why paying sooner keeps the penalty smaller.
How much is the penalty for not paying estimated taxes?
It depends on how much you were short, for how long, and the rate at the time. Skipping all four 2026 payments and paying everything on April 15, 2027 costs about 4% of your year’s tax:
| Your 2026 tax | Penalty if all four payments are missed and paid April 15, 2027 |
|---|---|
| $5,000 | About $207 |
| $10,000 | About $413 |
| $20,000 | About $827 |
These figures assume no withholding, no information about last year’s tax (so the target is 90% of this year’s), and that the 7% rate continues into 2027.
Example: a freelance designer who skipped every 2026 payment
Maya is single and expects $60,000 of freelance profit in 2026, with no W-2 job. Her estimated federal tax is about $12,040: $8,480 of self-employment tax and $3,560 of income tax. To avoid a penalty she needed 90% of that, $10,833, paid in four installments of about $2,708. She paid nothing.
| If Maya pays the full balance on | Estimated penalty |
|---|---|
| October 15, 2026 | About $167 |
| January 15, 2027 | About $310 |
| April 15, 2027 | About $497 |
If Maya’s 2025 tax had been $7,000, paying $1,750 on each 2026 due date would have met the prior-year safe harbor, and her penalty would be $0, even though she would still owe the rest of her tax in April.
2025 and 2026 IRS underpayment interest rates
| Period | Annual rate |
|---|---|
| January 1, 2025 – March 31, 2026 | 7% |
| April 1 – June 30, 2026 | 6% |
| July 1 – December 31, 2026 | 7% |
The IRS announces each quarter’s rate about a month ahead. Source: IRS quarterly interest rates.
How to use the calculator
| Input | What to enter |
|---|---|
| Tax year | 2026 if you’re paying this year’s estimates now. 2025 if you’re filing last year’s return, including on extension. |
| Estimate from income | Your self-employment profit (income minus business expenses) and any W-2 wages. The calculator estimates your income tax and self-employment tax, and typical paycheck withholding unless you enter your own. |
| I have my return | Total tax from Form 1040, line 24, minus refundable credits, and federal tax withheld from line 25d. This gives the most accurate result. |
| Estimated payments made on time | What you paid by each due date. Leave late payments out. |
| Last year’s total tax | Optional, but often lowers the amount you needed to pay. Check the box if last year’s AGI was over $150,000 ($75,000 married filing separately). |
| When you paid the rest | The date you paid, or plan to pay, everything else. Leave it blank to use today. |
The calculator follows the Form 2210 regular method: four equal required installments, withholding treated as paid evenly on the due dates, payments applied to the earliest short installment first, and the daily IRS rate for each period. It doesn’t include state penalties, credits in the income estimate, or the annualized income method, which can lower the penalty if your income was uneven.
How to avoid the estimated tax penalty
You generally won’t owe a federal underpayment penalty if any of these apply:
- You owe less than $1,000 after subtracting withholding and refundable credits.
- You met the safe harbor: your withholding and on-time estimated payments covered the smaller of 90% of this year’s tax or 100% of last year’s tax. The prior-year figure is 110% if last year’s AGI was over $150,000, or $75,000 if married filing separately.
- You had no tax liability last year, last year’s return covered 12 months, and you were a U.S. citizen or resident all year.
The prior-year safe harbor is the easiest to plan around because you already know the number. Divide last year’s total tax by four and pay that on each due date, even if your income grows. Read more about the safe harbor rule.
2026 due dates
- April 15, 2026
- June 15, 2026
- September 15, 2026
- January 15, 2027
If you file your 2026 return and pay everything you owe by January 31, 2027, you won’t owe a penalty for the January 15 installment.
Two lesser-known ways to cut the penalty
- Raise your W-2 withholding. The IRS treats withholding as paid evenly through the year, even if it comes out of your December paychecks. If you have a W-2 job alongside your freelance work, a higher withholding on a new Form W-4 late in the year can cover earlier shortfalls. A late estimated payment can’t.
- Use the annualized income method if most of your income came late in the year. It lets you owe smaller early installments. See our annualized income guide and Form 2210 Schedule AI.
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What to do if you already missed a payment
- Pay what you can now. The penalty grows every day an installment stays short. Pay through IRS Direct Pay or EFTPS and choose “Estimated tax” (1040-ES) for the right year.
- Get back on schedule. Make the next installment on time. Catching up stops the penalty on the earlier shortfall but doesn’t undo the days it already accrued.
- Let the IRS figure it, or file Form 2210 to lower it. You don’t have to calculate the penalty yourself. If you qualify for a waiver, the annualized method, or actual withholding dates, file Form 2210 with your return.
More detail in our guide to missing a quarterly payment.
Can you get the penalty waived?
The IRS can waive or reduce the estimated tax penalty when:
- The underpayment was caused by a casualty, disaster, or other unusual circumstance that would make the penalty unfair. Federally declared disasters often postpone due dates automatically; check IRS disaster relief.
- You retired after reaching age 62, or became disabled, during the tax year or the year before, and the underpayment had a reasonable cause.
Request the waiver on Form 2210 with a signed explanation. If you’ve already received a notice, follow the instructions on it. First-time penalty abatement covers failure-to-file and failure-to-pay penalties, not the estimated tax penalty.
Estimated tax penalty vs. other IRS penalties
The estimated tax penalty is often confused with the penalties for filing or paying your return late. They’re separate, and you can owe more than one.
| Penalty | What triggers it | How it’s charged |
|---|---|---|
| Underpayment of estimated tax (Form 2210) | Not paying enough during the year | Daily at the IRS underpayment rate (7% a year in most of 2026) on each short installment |
| Failure to pay | Tax still unpaid after the April due date | 0.5% of the unpaid tax per month, up to 25%, plus interest |
| Failure to file | Filing after the due date, including extensions | 5% of the unpaid tax per month, up to 25% |
To estimate the late-filing and late-payment penalties, use Keeper’s late filing penalty calculator.
Do states charge an estimated tax penalty?
Most states with an income tax charge their own underpayment penalty, with their own rates, thresholds, and due dates. California, for example, publishes separate estimate penalty rates. This calculator covers the federal penalty only. Find your state’s estimated tax rules.
Stop paying penalties: let Keeper handle your quarterly payments
Upload last year’s return, wherever you filed it, and Keeper works out your safe-harbor amount and schedules all four federal estimated payments with the IRS. Each one comes out of the bank account you choose on its due date. Keeper also tracks your write-offs, which lowers what you owe in the first place. State payments are made separately. Try Keeper free or see how quarterly payments work.
By Justin W. Jones, EA, JD
