Once again.......the Budget is the driving force........how can I explain?

OK.....There is a barrel named "The Budget" that the State says, "Fill!"
The tax collectors go around and gather up the money to fill the bucket.
When the bucket is full they quit collecting. If I don't pay, you will have to give more to fill the bucket.

My example is grossly over simplified......like we all know the taxes don't quit being collected.....but the amount that will be (as in future tense) collected is an anticipated amount and subtracted from the bucket amount.......making a smaller bucket for you and I to fill. (A behind the scenes type of thing)