What is a Guaranteed Minimum Pension (GMP)?
In 1978 the Government introduced a top-up to the basic State Pension called the State Earnings Related Pension Scheme, or 'SERPS' (later renamed as the State Second Pension, or 'S2P'). Under this arrangement, both employers and employees would pay higher National Insurance (NI) contributions towards SERPS. However, as many people were already members of company pension schemes, the Government allowed these schemes to contract out of SERPS — and most schemes chose to contract out – which meant that the NI contributions paid by both employers and employees were lower.
To make sure members of company pension schemes could not be worse off by being contracted out of SERPS, company schemes were required to provide a Guaranteed Minimum Pension (GMP) of at least the same amount that their members would have earned under SERPS.
So the GMP is the minimum amount of pension that NAPS must pay to members who built up pension between 6 April 1978 and 5 April 1997 as the Scheme was contracted out of SERPS. The GMP is included in the pension earned from NAPS and is not paid on top but, if you haven't built up enough benefits in the Scheme to provide your full GMP amount, the Scheme must make up the difference.