How to File an Amended Montana Tax Return

Montana State Taxes
amend Montana taxes
Montana
"The Treasure State"

When Do I Need to File an Amended Montana Tax Return?

Your Montana amended state tax return should be filed within 3 years of the filing deadline for the original tax return, or 2 years from the time when tax was paid (whichever is later).

How Do I Fix My Montana Tax Return or File a Tax Amendment in Montana?

If you need to change any information on your accepted Montana tax return, or if you amended your federal tax return, you will need to file a Montana amended tax return. Follow these instructions on how to amend your Montana tax return: 

  1. Download and complete Form 2.
  2. Fill out Form AMD and attach it to your amended return.
  3. Mail your amended return to one of these addresses: Montana Department of Revenue, P O Box 6577, Helena, MT 59604-6577 (expecting a refund or don't have to pay any tax) or Montana Department of Revenue, P O Box 6308, Helena, MT 59604-6308 (pay tax).

Montana State Tax Amendment Forms (Download, Fill Out, Print, and Mail)

Fill out the income tax form checking the box that says "Amended Return". When sending the tax amendment form make sure to attach any schedules and other documents that were used when making the original filing.

Form (Tax Year) Description
Form AMD Montana Individual Income Tax Amended Return Reconciliation
Form 2 (2015) Montana Individual Income Tax Return
Form 2 (2014) Montana Individual Income Tax Return
Form 2 (2013) Montana Individual Income Tax Return
Form 2 (2012) Montana Individual Income Tax Return
Form 2 (2011) Montana Individual Income Tax Return

How Do I Check the Status of My Montana Amended Tax Return?

Call the Montana Department of Revenue Phone Number at 1 (866) 859-2254.

What Are the Penalties, Interest, and Fees Related to Montana State Tax Amendments?

The state of Montana computes a 8% interest rate on both unpaid and overpaid taxes.

A late payment penalty (equal to 1.2% per month or fraction of a calendar month on the unpaid balance) is waived if you provide the full payment including interest for any unpaid tax when filing your tax amendment form.

Where Do I Mail My Montana Amended Tax Return? - Montana Mailing Address:

If you are expecting a refund or don't have to pay any tax, then mail to:

Montana Department of Revenue
P O Box 6577
Helena, MT 59604-6577

If payment is attached, then mail to:

Montana Department of Revenue
P O Box 6308
Helena, MT 59604-6308

Montana Department of Revenue Phone Number: 1 (866) 859-2254

Montana Department of Revenue

Where Do I Find Montana Tax Information?

How Do I Just File My Montana Tax Return?

Where is my Montana State Tax Refund?

Montana Tax Extensions

Montana Income Tax

What If I Need to Amend My Federal Tax Return?

Learn how to amend your IRS tax amendment.