BUDGET

1: A spending plan based on income and expenses. A budget identifies the available capital, estimates the spending, and helps predict revenue. A budget can help plan for business activities and can act as a yardstick for setting up financial goals.
2: A quantity (as of energy or water) involved in, available for, or assignable to a particular situation; also : an account of gains and losses of such a quantity.

EXAMPLE:

I’m not sure if that new work truck will fit in our budget.