So far as verification is concerned, none is done on a routine basis. The tax credit system was attractive to the treasury, partly because it was argued that it could be delivered at low admin costs. This is why we have the notion of "complete claims", which are only touched by a human when being scanned in, and the rest done by the computer. Automated verification checks and risk assessment are done by software, and problems flagged up to the RIAT team within the HMRC. The RIAT team also deal with informers etc. The enquiries and examinations systems run from this platform. In effect, the system depends on honsety, coupled with verification when the alarm bells ring on a particular case (maybe when there is a particular change of circumstances report etc). Note the wording of s19, which allows random checking.
So far as mental capability is concerned, one has worries about the HMRC will cope with this. Have a look at para 10170 of the HMRC compliance manual, which refers to reasonable excuses for not complying with reporting requirements. No reference to mental health issues. By contrast, the DWP is up for it. See para 84846 of the DMG, which confirms that "mentally incapable" people cannot deprive themselves of capital in notional capital cases - relatively enlightened!
Steve
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