To ask the Chancellor of the Exchequer if he will estimate the effect on Treasury revenues in a full year in (i) 1991–92 and (ii) 1992–93 of introducing an upper limit on all income tax allowances and reliefs of (a) £10,000, (b) £15,000 and (c) £20,000 a year with (1) the current tax allowances and reliefs and (2) limiting all income tax allowances and reliefs except the single person's allowance to the basic rate, giving the revenue from each relief separately, the total revenue and the numbers of people affected, for Great Britain and Northern Ireland.

[pursuant to his reply, 19 December 1991, c. 221]: I regret that, due to an administrative error, the complete answer was not given. It should have read as follows:It is estimated that at 1991–92 levels of income the introduction of the upper limits specified would yield the following:

Upper limit for total allowances and reliefs	Yield in a full year under the current tax regime	Yield following restriction of all reliefs and specified allowances to the basic rate
	£ million	£ million
£10,000	590	390
£15,000	240	150
£20,000	140	90

The estimated yield from restricting all allowances, except the basic personal allowance, to the basic rate is about £300 million. The estimated yield from restricting all reliefs to the basic rate is £600 million. Of this figure about £250 million results from restricting relief on employee contributions to occupational pensions and about £150 million results from restricting relief on personal pension contributions.The number of people with total allowances and reliefs in excess of £10,000 is about 635,000. The corresponding figures for £15,000 and £20,000 are about 75,000 and 35,000 respectively.The estimates of revenue yield do not take account of any behavioural effects which might result from the introduction of such a limit.It is not possible to provide corresponding detailed estimates for 1992–93.