Hi HaiTran
Thanks for your post and Welcome to the Community Forum.
The GST report lists all transaction recorded based on the tax code used. while the GST return report shows the GST summary for Activity Statement purposes.
I'd suggest double check the sales transactions recorded with your accountant or with ATO to determine if a different tax code should be used, or if they should be recorded as negative purchases so they can be correctly reported in the Activity statement.
Let me know if you require any further assistance with this. I'm happy to assist you.
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Cheers,
Cel
