Amend your return: If you forgot to file Schedule CB for this or a prior year

If you forgot to file a 2025 Schedule CB with your 2025 Massachusetts personal income tax return, you should file an amended return with your 2025 Schedule CB and complete the following.

Fill in the Amended return oval on your income tax return and submit: Schedule CB Real estate tax bills and/or the actual tax paid, or proof of rent paid Sewer and water bills or proof of the actual amount paid