Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Why would you ever turn down a raise in salary?
In the UK, recent changes to pension taxation mean that from April 2011, people earning between £150,000 and £180,000 total and making large pension contributions (>£50,000 or so) will pay a marginal tax rate on additional salary of >100%. This is because pension contributions normally attract tax relief at the highest marginal rate - i.e. 40% if the gross salary is above about £40,000, and 50% for salaries above £150,000. But after April 2011, the rate of relief will be tapered down for gross salaries above £150,000, reaching 20% for a gross salary of £180,000. So for example if you earn £175,000 and make a contribution of £50,000, then an additional £1,000 in salary will incur £500 of direct tax, and also lead to a 1% reduction in tax relief (from 25% to 24%), costing another £500. Once you factor in National Insurance of another 1% or so, the net effect of the pay rise is negative.