a tip off to c'link won't ruin anyones reputation
if they are investigated, they are investigated - it happens all the time
it's not like you're going to go on fb and tell all and sundry that this person is duping the system or something stupid like that. Business Integrity officers don't involve anyone else in an investigation unless it is absolutely necessary (and it would be only employers - which this person doesn't have - or banks/ATO etc) - it's not made public knowledge at all unless the person being investigated is stupid enough to whinge about it themselves!

put in a tip off - there is a real chance that the person has declared their business and their income is being taken into account, including profit and loss. but it's better to report them and have it checked, then to NOT report them, leave it ages, then somehow they get caught later down the track and end up with far more of an overpayment kwim? if they're doing the wrong thing, the sooner it is "caught" and rectified, the better (in a sense) it is for them cos they will get less of a debt etc



ETA - you don't have to sit on the phone to do a tip off either - you can do it online on the human services website