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This ‘Code of Practice’ (COP26) provides detailed information on tax credits overpayments, including:
why overpayments can happen
how to pay an overpayment back (and when you do not have to)
challenging the recovery of an overpayment
what happens to your overpayment if you ask for your tax credits award to be reconsidered
It also covers what you and the Tax Credit Office should do to help get your tax credits right to avoid an overpayment.