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If you can't find your TFN and do not suspect misuse, phone ATO on 13 28 61between 8:00am and 8:00pm Monday to Friday and 10:00am to 4:00pm Saturday. You can also phone Sunday between 10.00am to 4.00pm from 1 July to 31 October
If you have a myGov account linked to the ATO, you can access your TFN online.