Missing a quarterly estimated tax payment is common and usually fixable. The cost is an underpayment penalty that works like interest — it grows with the amount you are short and the number of days you are late. The best move is almost always the same: pay as soon as you can.
How the penalty works
The IRS compares what you paid by each due date with what you should have paid. For each quarter you were short, it charges a penalty on the shortfall, calculated daily, at the federal underpayment interest rate. That rate is the federal short-term rate plus 3 percentage points and is reset every quarter. Because it is calculated per day, paying a week late costs far less than paying months late.
The penalty is figured on Form 2210, which most tax software completes for you. Many people simply let the IRS calculate it and send a bill.
You may not owe a penalty at all
There is no penalty if any of these is true:
- You owe less than $1,000 when you file, after withholding and credits.
- Your withholding and on-time payments covered at least 90% of this year’s tax.
- They covered at least 100% of last year’s tax — or 110% if last year’s adjusted gross income was over $150,000 ($75,000 married filing separately).
The quarterly estimated tax calculator shows the minimum payment that meets these safe harbors.
What to do now
- Pay the missed amount right away through IRS Direct Pay or your IRS Online Account. Every day earlier reduces the penalty.
- Keep the next payment on schedule. Paying late for one quarter does not excuse the next.
- If you have a W-2 job, use withholding. Federal tax withheld from wages is treated as paid evenly through the year — even if you increase it in November. Raising withholding on Form W-4 late in the year can wipe out an earlier shortfall.
- If your income came late in the year, the annualized income installment method (Form 2210, Schedule AI) can reduce or remove the penalty for early quarters.
Can the penalty be waived?
The IRS can waive it in limited cases — for example when the underpayment was caused by a casualty, disaster or other unusual circumstance, or if you retired after reaching age 62 or became disabled during the year (or the year before) and the underpayment was due to reasonable cause. Ask on Form 2210 or after you receive a notice.
Missing a payment is not the same as not paying
The underpayment penalty is separate from the penalties for filing late or paying your final balance late. Even if you missed estimates, file on time and pay what you owe by the April deadline to avoid stacking those on top.
To stay ahead next year, set aside a fixed share of every payment you receive — the set-aside calculator gives you the percentage — and put the four due dates in your calendar.