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Taxation
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Underpayment of Estimated Tax by Individuals, Estates, and Trusts (Form EST-I)

December 10, 2024

/download/82954/

You may use this form to calculate interest on underpaid estimated taxes.

Download the Underpayment of Estimated Tax by Individuals, Estates, and Trusts

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Helpful Resources

Citizen Services Call Center

Contact Us Online

Phone: (406) 444-6900

TDD: Montana Relay 711

Email: DORHelp@mt.gov

We’re available Monday through Thursday, 9:00 a.m. until 4:00 pm and Friday, 9:00 a.m. until 1:00 p.m.

Taxpayer Advocate

If you need help working with the department or figuring out our audit, appeals, or relief processes, the Taxpayer Advocate can help.

Contact The Taxpayer Advocate Online

Mail: 125 N Roberts Street Helena, MT, 59601

Phone: (406) 444-6789

TDD: Montana Relay 711

Fax: (406) 444-3696

Email: DORTaxpayerAdvocate@mt.gov

Learn More About the Taxpayer Advocate

Helpful Resources

Citizen Services Call Center

Contact Us Online

Phone: (406) 444-6900

TDD: Montana Relay 711

Email: DORHelp@mt.gov

We’re available Monday through Thursday, 9:00 a.m. until 4:00 pm and Friday, 9:00 a.m. until 1:00 p.m.

Taxpayer Advocate

If you need help working with the department or figuring out our audit, appeals, or relief processes, the Taxpayer Advocate can help.

Contact The Taxpayer Advocate Online

Mail: 125 N Roberts Street Helena, MT, 59601

Phone: (406) 444-6789

TDD: Montana Relay 711

Fax: (406) 444-3696

Email: DORTaxpayerAdvocate@mt.gov

Learn More About the Taxpayer Advocate