HC Deb 15 June 1973 vol 857 c396W
Mr. Evelyn King

asked the Chancellor of the Exchequer if he will estimate the cost to the Treasury of permitting each husband or wife to pay income tax on his or her individual income, irrespective of that of the spouse.

Mr. Nott

No precise estimate can be given, but the cost is unlikely to be less than £100 million if it is assumed that married couples would arrange their sources of investment incomes between them to their best advantage.