by mullet on Sun Jan 08, 2012 4:20 pm
Difficult to respond without knowing much about you. Some reliefs rely on a specific payment date being within a tax year for relief to be available in that year. Other reliefs can be either applied in the year of payment (or loss etc) or carried back one year. Sorry for not being more specific.
Remember the over-riding principle - in order to obtain relief whether it be at 20%, 40% or 50%, you have to spend/lose 100% of the amount on which you are obtaining relief. The easiest way to obtain 100% relief from a year's income tax is to give all your income to a registered charity. OK, no tax ... but no income left to spend either!