The old state pension has two elements. Basic Pension and Additional State Pension. The new state pension is a fixed amount based only on how many full years of NIC you have.
To receive Additional State Pension you had to pay contributions under SERPS and/or the Second State Pension scheme (SP2) which superceded it. SP2 came to an end on 5 April 2016.
If you were contracted out of SERPS or SP2, you paid reduced NIC. You should have received a workplace pension at least equal to the Additional State Pension you would have received had you not been contracted out. This is known as the Guaranteed Minimum Payment (GMP).
It isn’t that simple because of the many and various changes that were made to SERPS and SP2 while they existed. People may have various compensatory adjustments to their pensions as a result.
This paper from Steve Webb, a former pensions minister under the coalition, instigator of the triple lock and now partner at Lane, Clark Peacock, explains the complexities of contracting out and how it affects state pension entitlement under both the old and the new state pension systems. It is a long and complicated read but I urge people to read it to see how it relates to them:
www.lcp.com/media/1150050/why-is-money-being-deducted-from-my-state-pension.pdf
(The title of the URL is misleading as it also covers cases where money is added to the state pension.)
The maximum Additional State Pension someone can have built is £204.68. That is paid on top of the maximum basic pension of £156.20 (if you have enough contribution years). Therefore it is possible for someone with a full record of NIC, including maximum SERPS and SP2, to have a total old state pension of £360.88 per week.
Under the New State Pension scheme it is no longer possible to build an Additional State Pension. The maximum new state pension is £203.85.
There are transitional arrangements for people whose pensionable age means they receive the new state pension but who paid SERPS and SP2 before 6 April 2016. They should not lose out as a result of the changes. A comparision is made to see whether they would have received more under the old system. If they would have been better off under the old system they receive a Protected Payment on top of the new state pension. Here is a very simple example:
Someone with enough contribution years for a full state pension under either system:
Under basic pension rules £156.20
Additional State Pension say £50.00
Total Pension £206.20
Under new state pension rules £203.85
Protected payment £2.35
Total Pension £206.20
Bear in mind that the new system will eventually comprise only people whose entire NIC history will be post 5 April 2016.
There are still many people who are not part of a workplace pension scheme. According to government figures for 2022, 88% of eligible employees were participating in a workplace pension which means that 12% of people were not. One 2022 survey revealed that more than 1 in 5 people have either opted out or are considering opting out of their pension scheme in response to rising inflation. (The DWP’s own figures were more modest, with opt-out rates increasing 10.4% overall but it's a worrying trend. )
In other words. one could argue that the higher rate of the new state pension is and will be a safety net for those who may not have a workplace pension and can no longer build an Additional State Pension - similar to pension credits being used to boost someone's pension.
I don’t believe the equalisation of pension age introduced in the Pensions Act 1995 is a factor in the rate of the new state pension. Men also come within one or other system but are only affected by the increase in pension age introduced in the Pensions Act 2011.
I do not know what actuarial calculations were made to arrive at the new state pension (other than those described in Webb’s paper) but it’s worth noting that until very recently, the rate at which NIC has been levied has increased year on year. By 2022 it was 13.25%. By comparison, the contracted-in rate in 1978 was only 6.5%. Over time, it more than doubled. As wages have risen so have NIC contributions until very recently. Younger pensioners may have contributed far more in NIC than older pensioners and that may have factored into actuarial calculations.
In summary, we know that state pension is a contributory benefit. Under the old system, people were able to contribute to an Additional State Pension or were contracted out and received an equal or better workplace pension under GMP. That is no longer the case.
It is perfectly possible for someone on the old system to receive £157 per week more than someone on the system.
A drop in the ocean in the great schemes of things....but replicated by how many more


. If people read the thread before adding comments they will see that this has been addressed more than once.