2023 MA Fiduciary and Partnership Tax Forms and Instructions. Fill in if: Amended return.Other jurisdiction change Enter date of change. Taxpayers must use the state withholding amount in Form W2, Box 17. The budget is finalized and is commonly referred to as the "General Appropriations Act" for the upcoming fiscal year. You may also be able to file your tax return online through DOR's MassTaxConnect. For 2023, drafts of forms and instructions can be found on the SES. All the following forms are fillable PDF files that require Adobe Acrobat Reader for viewing. File sizes range from 60 KB to 250 KB. For a fiscal or short tax year return, fill in the tax year space at the top of the form.