Question: How to change taxable period of my last submission GST period?
Answer:-
If you are using ver1.9 at Tax > TaxCode maintenance > Configuration Malaysia GST > GST Option. It can change to 5 or 6 months, if you have any bad debt relief / recovery to process at Last GST submission.
For those using ver1.8 at Tools > Option > Good & Service Tax.
Happy AutoCount Accounting.