Australian BAS – Change from Quarterly to Monthly from July 2026

Question

Hi everyone,Looking for advice on changing an Australian BAS setup from Quarterly to Monthly from 1 July 2026 in MYOB Acumatica 2025.1 (Build 2025.101.503.568).Current Tax Periods:01-2026: Jan–Mar — Closed	02-2026: Apr–Jun — Closed	03-2026: Jul–Sep — Open	04-2026: Oct–Dec — OpenBusiness needs Apr–Jun 2026 to remain quarterly, then Tax Year 2027 to start 1 July 2026 with monthly periods through 30 June 2027.The GL Financial Year 2027 is already correctly configured as 1 July 2026–30 June 2027 with 12 monthly periods.Can we safely shorten the 2026 Tax Year by deleting only the open 03-2026 and 04-2026 periods, then create Tax Year 2027 as Monthly, without affecting the closed Apr–Jun 2026 period?What is the supported approach for this scenario?

saravanaacumaticaconsultant · Answer

This is an AI generted AnswerYes , since Apr–Jun 2026 is already closed, it should remain unchanged.The supported approach is to mark Tax Year 2026 as a Short Tax Year and delete only the open periods (Jul–Sep and Oct–Dec 2026). Then create Tax Year 2027 with Monthly periods starting 1 July 2026.Please test this in a copy of the company and confirm with MYOB Acumatica Support before making the change.Closed tax periods cannot be modified.

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