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This PDF on the ATO website shows what you must include on an invoice. While you will need to show an invoice number, there’s nothing that indicates it must be consecutive numbering.

But to make your system easier I would suggest you run separate numbers eg Q1, Q2 and I1, I2 etc. By the way, your quotes should be kept and any that are taken up, record the invoice number you used. Any that are “dead” need to be kept and noted that they weren’t taken up (I learnt this in an ATO audit)

Wendy :)