ContributionsMost RecentMost LikesSolutionsRe: Your withholding payer number must be in the format 00 XXX XXX XXX Trying to save my setup in AR and can't because of the same error message. AR wants a 10 digit WPN but the ATO has issued me with an 8 digit number. (They call it a Pay as You earn account number and it's the one we have used for years) Are you saying in your post that one should ignore that ATO-issued number and simply paste the number you've typed "00 111 111 111" ? (NB I cannot find a reference to "WPN" on the ATO site!)