The basic rule is that before they can recover an overpayment, there has to be a decision which disqualifies the claimant from benefit for the relevant period first. This will be a revision, if the decision is thought to have been wrong all along, or a supersession if it was right initially but there was a change of circumstances which is thought to ahve meant it was no longer right. This is section 71(5A) of the Social Security Administration Act.
Where the decision is on a current claim, it can be easy to show that there must have been a revision/supersession because benefit payment stops suddenly. Where it is for a past period the revision/supersession can't be inferred like this. To be valid, the decision needs to state that it is disallowing benefit for the past period, say why (ie explain in this case that the person no longer qualifies for the benefit because he is conclusively deemed to have been capable of work whatever the facts of his disability are, because he was doing the wrong sort of work, and if it's IS rather than IB he didn't qualify by any other route such as disabled worker which is often worth a twirl anyway). It must identify and reverse the decision awarding benefit and if there are several of them, because of renewals, must identify and revise/supersede every single one. If there is no adequate proof that this has been done - and a bare assertion in the subs if it goes to appeal isn't proof - then any overpayment, even if there has been one, is irrecoverable.
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