The Guardian notes today that:
I am pleased that the TUC has picked up this policy initiative, which is something I first wrote about some time ago.
The economic logic of this proposal is very simple. Maximum pay should either be 10 times median pay in the UK or 20 times the anticipated minimum wage. The number happens to come out at about £250,000 in either case. it is very obvious to anyone that no one need earn more than this figure to live a very good life of more than adequate material sufficiency in the UK. Therefore, any distribution to a person over about this sum must be of profit, and not pay as far as the company making payment is concerned. But profit distributions are not tax allowable in corporation tax. As a result no tax relief should be provided on them for the purposes of that tax. This has the obvious economic consequence of increasing the cost of payment of the bonus, and so reduces the amount of bonus payable, reducing pay differentials as a result, which is the intention of the proposal.
I would stress, however, that this does not mean that if paid by an employer who does not get tax relief on it the resulting receipt by the employee is not taxable as income from employment. It should, of course be treated in a way, and also be subject to National Insurance. The logic of tax deduction for corporation tax need not be matched by the treatment for income tax or National Insurance. There are ample cases where there is a mismatch between economic justification for a payment and tax treatment. This is one of them. There is no pretence in the proposal that the result is tax neutral. It is meant quite deliberately to tax something (bonuses) that is causing harm to our society, and in that context tax justice is achieved by inequality of treatment, and not by equality.
Disclosure: I advise the TUC