To ask the Chancellor of the Exchequer if he will estimate what the reduction in the income tax revenue would be for 1992–93 on a full-year basis and assuming no behavioural changes (a) if there were no higher rate of income tax for individuals and (b) if there were no additional rate for trusts.

The costs in a full year at 1992–93 levels of income are estimated to be (a) £5·1 billion and (b) £30 million. These estimates are based on a comparison with 1991–92 tax rates and an illustrative indexation of personal allowances and the basic rate limit by 4 per cent.No account is taken of possible behavioural changes or of any effect on receipts of capital gains tax.