K-210 Underpayment of Individual Estimated Tax Rev 7-23 If you are an individual taxpayer (including 2026

1. Click ‘Get Form’ to open it in the editor.
2. Enter your name and Social Security number at the top of the form.
3. Complete lines 1 through 4 using information from your income tax return for both the current and prior year.
4. In Part I, assess if you qualify for any exceptions to the penalty by filling out lines 5 through 10 based on your withholding and estimated payments.
5. For Part II, calculate any underpayment by following instructions on line 11, considering due dates and days late as specified in lines 12 and 13.
6. Finally, compute the penalty on lines 15 through 18, ensuring all calculations are accurate before submission.

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