The annual allowance for pension contributions in 2014-15 is £40,000, which is the gross equivalent and includes all contributions from all sources (i.e. incl. employer contributions). Unused allowances from the previous three years may be carried forward and used in the current tax year. (You need to have been a member of any UK pension scheme in a given tax year to qualify for the contribution allowance in that year).
Carry forward of pension annual allowances can have its intricacies, but basically you must first use the current year’s and then work backwards. All of the tax relief obtained is applied against current year’s income. The annual allowance was £50,000 in each of 2011-12, 2012-13 and 2013-14 (so potentially an individual could pay up to £190,000 into pensions in the current tax year).
Please give me a call if you are interested in any last minute lump sums into pensions.