What is the collective noun for bills?

There isn't a single, universally accepted collective noun for bills. However, here are some options depending on the context:

General:

* Pile of bills

* Stack of bills

* Bundle of bills

* Heap of bills

Formal:

* Collection of bills

* Set of bills

* Ledger of bills

Humorous:

* A mountain of bills

* A blizzard of bills

The best choice will depend on the specific situation and the desired tone.