asked the Chancellor of the Exchequer what was the total revenue received annually by the Exchequer in income tax since 1938; and what percentage each of these figures represented of total Government receipts from taxation from all sources for that year.

The figures are given in the table below.

	Yield of income tax	Income tax as a percentage of total central government taxation
	£ million
1938	312	35·6
1939	346	35·3
1940	473	34·2
1941	664	31·0
1942	850	33·2
1943	1,113	36·5
1944	1,279	39·2
1945	1,353	41·4
1946	1,262	39·7
1947	1,141	35·9
1948	1,228	34·9
1949	1,385	37·3
1950	1,420	38·1
1951	1,504	37·4
1952	1,670	39·5
1953	1,714	40·7
1954	1,762	40·3
1955	1,964	42·0
1956	2,020	42·1
1957	2,190	42·8
1958	2,285	43·1
1959	2,328	42·7
1960	2,285	40·9
1961	2,565	41·7
1962	2,846	42·5
1963	2,823	42·0
1964	2,941	40·9
1965	3,374	41·8
1966	4,120	45·8
1967	3,666	36·8
1968	4,168	36·3
1969	4,779	36·3
1970	5,524	37·5
1971 (Provisional)	6,192	40·6

The figures for income tax relate only to that tax and exclude other taxes included as "taxes on income" in the national accounts, e.g., surtax, profits tax, corporation tax. Total central Government taxation includes all the taxes shown in the national accounts as taxes on income, taxes on expenditure and taxes on capital but excludes national insurance and similar contributions.