Maintain an Australian GST history when an asset's use changes

When an Australian business changes how it uses an acquisition, retain the original GST claim and intended-use assessment. Add the new facts alongside them. Replacing the old percentage in an asset spreadsheet removes the starting point needed to explain whether an adjustment is required.

ATO guidance on Division 129 compares actual application for a creditable purpose with intended or previously assessed application. Actual application is measured cumulatively from acquisition to the relevant adjustment period. The number of applicable periods and exclusions depend on the acquisition, so have the tax or BAS agent confirm the review schedule before building recurring calculations.

Create a dated history of the activities served, the person responsible and the evidence available. Depending on the item, useful records might include equipment bookings, occupancy records or project assignments. Choose a measure that reflects the item's use; revenue percentages or headcount should not become defaults merely because they are easy to export.

ATO guidance requires a fair and reasonable apportionment basis. It also distinguishes private or domestic application and application relating to input-taxed supplies from creditable purpose. Ask the reviewer to identify which activities fall into each category before finance calculates a percentage from operational records.

Record a change in intended plans separately from evidence of actual use. A management proposal to transfer equipment may never happen, while an informal sharing arrangement may already affect how it is used. The history should let the reviewer determine what occurred and when, without treating the latest budget as a record of past activity.

Keep a column for the original intended percentage and another for the application used in the last adjustment. They answer different questions. For a later adjustment, reusing the original estimate can repeat a change already recognized in an earlier BAS.

Consider an illustrative acquisition whose reviewed intended creditable use was 80%. Suppose the first approved cumulative assessment was 65%, and a later cumulative review establishes 70%. The later movement is measured against the previously assessed 65%, rather than treating the full difference from 80% as new again. The example demonstrates the comparison record; the agent must confirm the applicable periods and tax calculation for the acquisition.

Preserve the workings behind every assessed percentage, including the population of use records and treatment of missing intervals. Document why a representative sample remains suitable if the business's operating pattern changes.

For each completed review, record the acquisition reference, eligible adjustment period, previous application, current cumulative application, approved amount and BAS reference. Reconcile the posting to the tax ledger and retain a sign-off from the person responsible for the tax judgment.

Flag disposals, destruction, major changes in activity and registration cancellation for the adviser. Do not delete the tax history simply because the asset disappears from the operational list. Keep unresolved cases visible with the evidence still needed and a review owner; the next BAS preparer should inherit a dated history, not a lone percentage with no explanation.