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Invoice Numbering

Customise the format of invoice numbers

Every invoice created by PennyPerfect is given a unique invoice number. This unique identifier is an easy way to refer to particular invoices when corresponding with practice managers and accountants. The invoice number can be customised in a number of ways to ensure practices will not receive invoices with the same number from different sources.

The default settings create invoice numbers such as INV-0123. The customisations allow invoice numbers such as JD_123, I-00123, DrDolittle-0123, I123-Dolittle etc.

Customising the invoice numbering

Begin numbering from

By default the first invoice created will be number 1. If you already have an invoicing system which you are replacing, you can change this number to something else to follow on in sequence from your previous system.


The default invoice number prefix is INV-, which will create for example an invoice 'INV-00123'. You may wish to change this to something else such as your initials, to create for example 'JD-00123'. This will help to ensure practices don't receive invoices with the same invoice number from different sources.

Number Format

The number format affects the numeric part of the invoice number. For example, the number 123 and the format '0000' would display '0123', format '0-00' would display '1-23'.


By default there is no suffix added to an invoice number, but you can add any free text as you see appropriate.