HC Deb 27 October 1983 vol 47 c182W
40. Mr. Alexander

asked the Chancellor of the Exchequer what is his latest estimate of the amount of tax lost to the Inland Revenue through the black economy; and if he will make a statement on his efforts to reduce this amount.

Mr. Moore

It is not possible to make any firm estimate of the amount of tax lost through the black economy. The Inland Revenue keeps its procedures for the prevention and detection of tax evasion under continuous review.