If you have discovered your original Montana Income Tax Return for Estates and Trusts (Form FID-3) is incorrect or if there is an error on your federal return, you must file an amended return.

If you made an error on your original return, you may file an amended return up to three years from the original due date. If you receive a notification of correction from the IRS, you must file an amended return within 180 days of receiving the notice.

To file an amended return:

• Complete Form FID-3 again, marking the "Amended Return" box on the form
• Include all forms and statements explaining why you are amending the return
• Be sure to complete the new Form FID-3 using the corrected amounts

If the amended return changes the income or the distribution of income to beneficiaries, you will also need to file an amended Schedule K-1 and send an amended Montana Schedule K-1 to each beneficiary.

Amended Returns and Penalties

When you mark the "Amended Return" box on the Form FID-3, you are automatically requesting to have the late payment penalty waived on any increased tax liability.

To qualify for the penalty waiver, you must pay the increased tax liability and interest in full.

See Uniform Penalties and Interest for information on how to figure interest.