Probably mentioned up-thread but when you join you will earn 5,000 QFF pts.
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This is equivalent to $208 discount if you were to buy the points on the Qantas site.
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Many AFFers may also be able to claim the ALL Accor+ Explorer subscription against business income or indeed investment income.
If you travel for an investment inspection, an investment property perhaps, then the subscription is a legitimate deduction, but make sure you discuss with your accountant.