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17 May 2026

Thanks so much for the reply. Is there really no public information on how the calculation is done?


The completed tax return has roughly 40K income, 15k of which is back pay, which more than meets the 10% threshold. The backpay was also mostly for years where the tax free threshold applied. I don't understand how the return does not have an offset applied and wanted to understand that calculation.

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RE: How is Lump Sum E offset Calculated | ATO Community