Why is my non-resident clients HELP debt not appearing on the tax estimate?

Handitax provides an estimation of the Notice of Assessment. When a non-resident lodges a tax form, they are issued with a Notice of Assessment which excludes the HELP debt. The ATO then process and issue a secondary document known as a Notice of Overseas Levy.
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As Handitax provides an estimate of the Notice of Assessment only, any calculation related to the HELP debt is excluded.
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Below links from the ATO website are useful in explaining how HELP debt is calculated for non-residents:
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​Calculating non-resident foreign income for study or training loans | Australian Taxation Office (ato.gov.au)
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​Overseas repayments | Australian Taxation Office (ato.gov.au)