For most taxpayers the maximum pension contribution is £40,000 each tax year, although this depends on their earnings. This limit covers both contributions by the individual and by their employer.
Under the current rules, the government adds to your pension contributions at the 20% basic rate. For instance, if you save £4,000 in a personal pension the government tops this up to £5,000. If you are a higher rate taxpayer there is a further £1,000 tax relief when your tax liability is calculated, reducing the net cost to £3,000. This can be even more effective if your income is between £100,000 and £125,140 where the effective tax rate is 60%. Remember that pension fund investments can go down as well as up.