Massachusetts Constitution Amendments Art. LXIII, § 3

All appropriations based upon the budget to be paid from taxes or revenues shall be incorporated in a single bill which shall be called the general appropriation bill. The general court may increase, decrease, add or omit items in the budget. The general court may provide for its salaries, mileage, and expenses and for necessary expenditures in anticipation of appropriations, but before final action on the general appropriation bill it shall not enact any other appropriation bill except on recommendation of the governor. The governor may at any time recommend to the general court supplementary budgets which shall be subject to the same procedure as the original budget.