The difference between a bill and an expense can be explained as follows:
| Description | Expenses | Bills |
| Basic concept | Expenses which are paid immediately. | Expenses which are paid later. |
| Example | You refuelled your car at a gas station and paid cash. | You receive an invoice from your telephone service provider which you want to pay through bexio. |
| Accounts payable booking | No | Yes |
| Contact imperative | No | Yes |
| Payable directly through bexio | No | Yes |
| Can be assigned to a project | Yes | No |
These are only details, however: the two types of booking are identical in all other respects.