IN-152: Underpayment of 2025 Estimated Individual Income Tax (2025)
Vermont · Vermont Department of Taxes · Used for tax years 2025
Vermont Worksheet IN-152 calculates underpayments of 2025 estimated individual income tax. It compares required quarterly payments with tax payments and calculates interest and penalties on any underpayment.
When it's due
For tax year 2025, the worksheet lists these quarterly estimated payment due dates:
- First quarter: April 15, 2025.
- Second quarter: June 15, 2025.
- Third quarter: September 15, 2025.
- Fourth quarter: January 15, 2026.
For the 2025 underpayment calculation, Line 7 uses the date full payment was made or April 15, 2026, whichever is earlier.
What you'll need
Have these forms and payment details available to complete the worksheet:
- Your 2025 Form IN-111, including Lines 20, 26a, 26c, 26d, and 26e.
- Your 2024 Form IN-111, including Lines 20 and 26c.
- The amount of your 2024 carryforward and your 2025 quarterly estimated payments made by each due date.
- The date full payment was made for each quarter.
- Your name and Social Security number, and your spouse’s or civil union partner’s information, as requested in the taxpayer information fields.
Common mistakes
- Print in blue or black ink.
- Do not enter more than the required quarterly payment on Line 5c. Apply any excess to the next quarter.
- Do not enter a negative amount on Line 6.
- On Line 7, use the earlier of the full-payment date or April 15, 2026.
- For fourth-quarter interest on Line 8b, count days from January 15, 2026.
- When counting months for the penalty on Line 12, count a portion of a month as a whole month.
Questions people ask
How is the required annual payment calculated?
Line 3 uses the smaller of 90% of your 2025 Vermont tax minus credits or 100% of your 2024 Vermont tax minus credits. For each year, the worksheet uses Form IN-111, Line 20 minus Line 26c.
How much is required for each quarter?
Line 4 is 25% of the required annual payment on Line 3.
What interest rates does the worksheet use?
Line 9a uses 8.50% for 2025, and Line 9b uses 7.75% for 2026. Each calculation divides the applicable number of days by 365, then multiplies by the interest rate and the quarterly underpayment on Line 6.
How is the underpayment penalty calculated?
For each quarter, multiply the number of months on Line 12 by 1%, then by the underpayment on Line 6. A portion of a month counts as a whole month. Add the quarterly penalties on Line 14.
Where does the total interest and penalty appear?
Line 15 adds the total underpayment interest from Line 11 and the total underpayment penalty from Line 14.