Invoice numbers: where they start and how they count
Hotel details has a box for the next invoice number — type it the way your accountant writes it, 27ACP01, and every bill after counts up. The system's own bill number stays beside it as the internal record. Only an administrator; never rewound over a bill already issued.
Every bill carries two numbers. The system's own — ASARCP-FA000101 — is given when the bill opens, is unique, never changes, and is what the desk and the log call the bill: the internal record. The invoice number is the hotel's — 27ACP05 — and it is what prints as *Invoice No.* on the tax invoice, what goes on a company's statement, what is filed in GSTR-1 and registered for e-invoicing. It is also given when the bill opens, from the series set here.

Do this
- Onboarding → the hotel → Hotel details → Next invoice number: type the first number you want, exactly as it should print —
27ACP01— and Save. The next bill is27ACP01, then27ACP02, and so on. - Beside it, what the desk may waive at check-out — the ceiling in rupees (₹500 to start). See Waiving a small balance at check-out.
- And what the desk may discount — the share of a bill, in per cent, before a manager's name is needed (0 to start). See **Giving a discount on the bill**.
When the year turns
On 1 April type the new year's first number — 28ACP01. The prefix is different, so nothing can collide with last year's, and the numbers are unique within the financial year, as the GST law asks.
What it will not do
- Go backwards. If
27ACP14has been issued, the next can be27ACP15or later, never27ACP10. A bill in a guest's hand keeps its number. - Change the system's number.
ASARCP-FA000101stays on the bill for ever, whatever the invoice number says. - Take the setting from the desk. Only an account administrator may change it, and every change is on the hotel's log with the old number, the new one and the login.
A second window on the same stay (a split bill) is numbered 27ACP14-2 — its own invoice, off the same base. Bills that were opened before the series was set are numbered by the deployer when the series is switched on, in the order they were opened; the box says how many still have none.