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KaraATO(Community Support)Community Support
23 July 2026

Hi @Stacceeee,


@Taxduck has provided some helpful info.


Before making any adjustments, it's important to make sure the effective date of GST registration is correct. As already mentioned, GST registration can be triggered by either your current GST turnover or your projected GST turnover, so the required registration date may not necessarily be January 2026.


Customers would need a valid tax invoice to claim a GST credit. A letter on its own won't meet the tax invoice requirements.


I'd start by confirming the correct GST registration date, as that will help determine what needs to be reported and whether any invoices need to be updated.

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RE: Are there any penalties when backdating GST, advising customers and updating their invoices? | ATO Community