In general, a taxpayer’s Massachusetts gross income and many deductions are based on the taxpayer’s federal gross income and deductions under the Internal Revenue Code (IRC) as of a specific date. For tax years beginning on or after January 1, 2024, the Massachusetts personal income tax generally conforms to the IRC as amended and in effect on January 1, 2024. For further information regarding federal tax law changes see TIR 24-14 and Working Draft TIR: Massachusetts Conformity to Certain Provisions in Public Law No. 119-21.
As a general rule, Massachusetts does not conform to personal income tax law changes to the IRC made after January 1, 2024. However, certain specific Massachusetts personal income tax provisions, as set forth in MGL ch. 62, § 1(c), automatically conform to the IRC currently in effect. The provisions of the IRC that Massachusetts conforms to on a current basis include those provisions relating to:
- Roth IRAs;
- IRAs;
- The exclusion for gain on the sale of a principal residence;
- Trade or business expenses;
- Travel expenses;
- Meals and entertainment expenses;
- The maximum deferral amount of government employees’ deferred compensation plans;
- The deduction for health insurance costs of self-employed taxpayers;
- Medical and dental expenses;
- Annuities;
- Health savings accounts;
- Employer-provided health insurance coverage;
- Amounts received by an employee under a health and accident plan; and
- Contributions to qualified tuition programs.
Federal Tax Law Changes
Federal legislation passed in 2025 made a number of changes to the IRC. The Massachusetts personal income tax adopts only those changes that relate to provisions that Massachusetts adopts on a current basis (as listed above).
Note: Massachusetts does not adopt the federal deduction for tip income (IRC § 224) or the federal deduction for overtime pay (IRC § 225). For further information regarding federal tax law changes see TIR 24-14 and Working Draft TIR: Massachusetts Conformity to Certain Provisions in Public Law No. 119-21.
For nonresidents, you can only take deductions that are attributable to the income you reported.
Multiply your deduction by the Nonresident Deduction and Exemption ratio (Form 1-NR/PY, Line 14). This ratio is your Massachusetts gross income (from sources in Massachusetts), divided by your Massachusetts gross income from all sources (as if you were a full-year resident).
In addition to deductions that you will find on the Form 1-NR/PY itself, such as those allowed nonresidents for FICA, Medicare, RR, U.S. or Massachusetts retirement, certain dependent care expenses and the rental deduction, there is also a list of deductions the nonresidents are allowed to take on Form 1-NR/PY, Schedule Y, more fully explained in the instructions. All these deductions are allowed if directly related to specific taxable income reported on Form 1-NR/PY or to a personal Massachusetts residence.