“PART 13 - Overpayments Meaning of overpayment. 99. In this Part, “overpayment” means any amount which has been overpaid by way of housing benefit and to which there was no entitlement under these Regulations (whether on the initial decision or as subsequently revised or superseded or further revised or superseded) ... Recoverable overpayments 100. - (1) Any overpayment, except one to which paragraph (2) applies, shall be recoverable. (2) … this paragraph applies to an overpayment which arose in consequence of an official error where the claimant ... could not, at the time of receipt of the payment or of any notice relating to that payment, reasonably have been expected to realise that it was an overpayment. (3) In paragraph (2), “overpayment which arose in consequence of an official error” means an overpayment caused by a mistake made whether in the form of an act or omission by: (a) the relevant authority; (b) an officer or person acting for that authority; (c) an officer of the Department for Work and Pensions ... where the claimant ... did not cause or materially contribute to that mistake, act or omission.”
“12. In the submission on [the claimant's] behalf it was conceded that the overpayments relating to the increase in Tax Credits ... were recoverable. However I found that from 30 05 05 (the date of the Tax Credit award letter) until [she] disclosed this letter to the local authority (25 02 07) there was an overpayment created by [her] non-disclosure. The local authority could not be expected to correctly calculate HB and CTB until they were given all the information. Sier v HB Review Board held that an overpayment was automatically recoverable if the claimant had contributed to it. 13. ... Once [she] had given in the all important Tax Credit letter on 23 01 07 (and there was no evidence of it ever having been given in earlier) the local authority were in a position to make a correct assessment of her entitlement. ... I considered the case of CH/3647/2006 and it was quite clear to me that if [she] had provided the Tax Credit letter the overpayment would not have occurred.”