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GST analytical tool guide now available online

The GST analytical tool guide is now available on ATO Law for members of the Top 100 and Top 1000 populations.

Published 12 August 2025

The GST analytical tool (GAT) guide is now available on ATO Law to assist you in completing the GAT reconciliation process. You only need to complete the GAT reconciliation process if you're a business in the Top 100 or Top 1000 populations for GST.

The purpose of the GAT is to understand the reasons for the differences arising between accounting and GST figures, and to verify them with objective evidence.

Previously, we emailed members of the Top 100 and Top 1000 populations the guide and instructions at the commencement of an initial GST assurance review or combined assurance review. Small modifications have been made to the guide to clarify who it applies to and to provide clarity on the existing methodology. 

Businesses that are predominantly input-taxed are excluded from the current GAT process.

For taxpayers who've had a GST assurance review, the Supplementary annual GST return (SAGR) includes questions about whether this reconciliation has been undertaken and its outcomes.

To assist you with completing the GAT process we've developed frequently asked questions.

We'll work collaboratively with your organisation if you've had difficulties in completing the GAT process, by helping to find solutions using information from existing systems, as well as information we've gathered from our income tax assurance reviews.

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