Question to the HM Treasury:

To ask the Chancellor of the Exchequer, what estimate he has made of the annual cost to the public purse of the cash-in-hand economy in the private domestic repair, maintenance and improvement sector in the construction industry.

HMRC does not measure how much of the tax gap is specifically linked to cash. Cash plays a part in supporting the hidden economy and evasion. These behaviours consistently account for roughly 25% of the tax gap.

If anyone is aware of instances of a business or employer using cash to evade tax they can report this to HMRC; online or by phone.