How Do I Amend a Massachusetts State Return?

If you need to make changes to a Massachusetts return that has already been accepted, you'll need to file an amended Massachusetts return.

Common reasons to amend a return include:

• Correcting income, deductions, or credits
• Adding or removing tax documents
• Updating withholding amounts
• Claiming a missed refund or credit
• Correcting information after a federal amendment
• Disputing a Massachusetts health care penalty

Generate an Amended Massachusetts Return

To generate your amended Massachusetts return in the program:

1. Select 2026 Amended Return from the navigation bar.
2. Pay for your amended return.
3. Review the Filing an Amended Return page and continue.
4. Select Amend State Return(s).
5. Select Amended State from the white box.
6. Scroll to the bottom of the Massachusetts return menu and select Amended Return.
7. Check the first Yes box to generate your amended Massachusetts return.
8. Complete any applicable sections and make the necessary corrections.

What If You Received a Refund on Your Original Return?

If you already received a refund from Massachusetts, you must report that refund on the amended return so the program can correctly calculate the amended result.

In the Amended Return section, enter the amount of the original refund in the field labeled: Overpayment from Original Return

What If You Originally Owed Massachusetts Tax?

If you paid Massachusetts tax with your original return, you must report that payment on the amended return.

In the Amended Return section, enter the amount paid in the field labeled: Payments Made With Original Return

Including the payment made with the original return helps ensure the amended return accurately calculates any additional tax due or refund.

How Do You File an Amended Massachusetts Return?

Massachusetts amended returns must be filed on paper.

To print your amended return:

1. Select Review from the navigation bar.
2. Select View Return from the Tax Return Summary page.
3. Print the amended return PDF.
4. Sign the return.
5. Mail the return to the appropriate Massachusetts Department of Revenue address.

Only mail:

• The amended Massachusetts return
• Copies of supporting documents that explain or support the changes (such as Forms W-2, 1099s, or other applicable forms)

Do not mail a copy of the originally filed return unless specifically requested by the IRS or Massachusetts.

Where Do I Mail My Amended Return?

The correct mailing address is printed on the amended return and may vary depending on whether:

• You are receiving a refund, or
• You are submitting a payment with the amended return

Be sure to use the address shown on the amended return.

Important Notes 

• Review both your original and amended returns to verify all changes.
• Include documentation supporting the adjustment.
• Sign the amended return before mailing it.
• Keep a copy of the amended return and supporting documents for your records.
• Generally, Massachusetts amended returns must be filed within three years of the date the original return was filed.