Bill.com uses an auto-numbering system for invoice numbers that assigns the next sequential number to a new invoice, based on the number of the last invoice created.
Reset auto-numbering in Bill.com
To reset the auto-numbering sequence, edit the number of the next invoice you create and the numbering will continue from there. For example, if you edit the number to 100, the next invoice will be auto-numbered with 101, then 102, and so on.
Reset auto-numbering via sync
If you sync with accounting software and an invoice syncs to Bill.com as the newest invoice, the auto-numbering sequence will reset and continue numbering based on that invoice's number.