The Additional State Pension, also known as the State Second Pension or SERPS, is an extra amount of money that can be received on top of the basic State Pension in the UK. It was introduced by the Labour Government on 6 April 2002, to replace the State Earnings-Related Pension Scheme (SERPS) . The Additional State Pension was designed to skew existing Additional Pension (AP) benefits in favor of low and moderate earners at the expense of higher earners and to extend access to include certain carers and people with long-term illness or disability for the first time.

The Additional State Pension is paid automatically with the basic State Pension if the individual is eligible for it, unless they have contracted out of it. The maximum amount of Additional State Pension one can get is £204.68 per week, and the amount received depends on various factors such as earnings, National Insurance contributions, and the number of years one has paid into the scheme. If an individual reached State Pension age before 6 April 2016 and started claiming the basic State Pension, they will automatically get any Additional State Pension they are eligible for, and there is no need to make a separate claim.

Widows, widowers, or surviving civil partners may be able to inherit all or part of their late partners SERPS and 50% of their S2P. It is also possible to apply to a court for a share of any Additional State Pension during divorce proceedings.