SERPS and the State Second Pension: History, Accrual, and Your Entitlement

The UK's flat-rate new State Pension, introduced in April 2016, was designed to be simple. In practice, for anyone with working years between 1978 and 2016, the State Pension they receive is anything but simple — it reflects decades of earnings, National Insurance credits, contracting-out decisions, and the interaction of two now-closed supplementary pension systems: the State Earnings Related Pension Scheme (SERPS) and the State Second Pension (S2P).

For internationally mobile professionals and high earners with interruptions to their UK NI record, understanding what SERPS and S2P accrual you have banked — and what Contracted-Out Deduction has been applied against it — is important both for State Pension planning and for correctly interpreting the notional valuation used in divorce proceedings and defined benefit transfer assessments.

SERPS: 1978 to 2002

SERPS was introduced by the Social Security Pensions Act 1975 and came into force on 6 April 1978. Its purpose was to provide an earnings-related supplement to the basic State Pension, reflecting the principle that retirement income should bear some relationship to working income.

SERPS accrual was based on earnings between the Lower Earnings Limit (LEL) and the Upper Earnings Limit (UEL) — the "band earnings" — averaged across the best 20 years (later reformed to a full working life average). The original formula provided 25 per cent of average band earnings per year, assessed over a working life.

In the 1986 Social Security Act, the Thatcher government reduced the generosity of SERPS: the accrual rate was cut from 25 per cent to 20 per cent for earnings from April 1988 onwards, and the averaging basis was changed from best 20 years to the full working life average. These changes were phased in gradually; accrual between 1978 and 1988 remains calculated under the original 25 per cent formula.

For a worker earning consistently above the LEL throughout the SERPS period, accrued additional State Pension from SERPS could be substantial — for a high earner who never contracted out, accrual approaching £200 per week in additional State Pension at retirement was possible.

Contracting Out of SERPS

The government allowed employers and their schemes to opt out of SERPS — "contracting out." A contracted-out employer's occupational scheme (whether defined benefit or money purchase) replaced the worker's SERPS entitlement with a private pension benefit. In return, both employer and employee paid reduced National Insurance contributions.

Two main contracting-out frameworks existed for the SERPS period:

COSR (Contracted Out Salary Related): The employer's defined benefit scheme agreed to provide a Guaranteed Minimum Pension (GMP) at least equivalent to what SERPS would have provided. The employer retained NIC savings; the scheme bore the GMP liability. This was the dominant route for public sector and large private sector DB schemes.

COMP (Contracted Out Money Purchase): A defined contribution or personal pension could also be contracted out. Instead of GMP, the scheme accumulated "Protected Rights" — a ring-fenced pot built from the NIC rebates. Protected Rights were subject to separate investment and annuitisation rules and were abolished in April 2012, at which point they merged with general pension rights.

Contracting out via COSR is why many people with occupational DB pensions have a "Contracted-Out Deduction" (COD) reducing their State Pension forecast — the State effectively ceded their SERPS entitlement to the private scheme during those years, and the new State Pension calculation reflects this.

State Second Pension (S2P): 2002 to 2016

SERPS was replaced by the State Second Pension with effect from 6 April 2002. S2P was designed to be more redistributive than SERPS — it provided a proportionally larger benefit to low and moderate earners relative to their earnings, and it extended Additional State Pension credits to certain carers and people with disabilities who had not paid NI contributions through earnings.

In its early years, S2P remained earnings-related but with a "banded" structure that compressed the earnings relationship for higher earners. From April 2009, the government began moving S2P towards a flat-rate structure, reducing the degree of earnings relation in each successive year. By the time S2P closed to new accrual in April 2016 (replaced by the new flat-rate State Pension), the benefit it provided per qualifying year had become largely flat across a broad earnings band.

Contracting out of S2P continued on the COSR basis for defined benefit occupational schemes until April 2016, when contracting out was abolished entirely. It had already been abolished for defined contribution and personal pensions from April 2012, following the removal of Protected Rights.

The Reconstitution of Your SERPS/S2P Record

For the new State Pension (nSP) calculation, DWP applies a "starting amount" — the higher of:

1. Your entitlement under the old State Pension rules (basic State Pension plus Additional State Pension from SERPS/S2P), subject to the relevant deductions for contracting out.
2. Your entitlement under the new State Pension rules (qualifying years x £241.30/week ÷ 35, for 2026/27).

This starting amount is then adjusted by any qualifying years between 6 April 2016 and State Pension age. The key point is that your SERPS and S2P accrual — including the impact of any contracting-out periods — is embedded in your starting amount. It cannot be separated out at retirement; it is baked into the total State Pension figure.

However, the starting amount calculation can contain errors. HMRC's records of SERPS accrual are based on historical NI records, employer submissions, and contracted-out scheme reconciliation data. The 2014 to 2021 GMP reconciliation project revealed discrepancies in contracting-out records that may have affected starting amounts for some individuals.

If your State Pension forecast appears lower than expected given your working history, you should:

1. Request a full State Pension forecast from the DWP at gov.uk (or via the HMRC personal tax account).
2. Review the NI record for any gaps and check which years were credited as contracted-out.
3. If you worked for an employer with a contracted-out DB scheme, contact the scheme to verify the contracted-out dates on record.
4. HMRC operates a service (check the gov.uk website for current contact details) to query the starting amount calculation, though timescales can be long.

Missing NI Credits and SERPS/S2P

During the SERPS and S2P periods, certain individuals were entitled to NI credits rather than paid contributions — including those receiving certain benefits, carers, and those on maternity or adoption leave. These credits count towards qualifying years for the basic State Pension and — under S2P — could also generate Additional State Pension credits.

Internationally mobile individuals who spent part of the SERPS/S2P period working abroad may have gaps in their UK NI record. These gaps reduce the starting amount. Voluntary Class 3 NI contributions can be paid to fill some historical gaps, and for self-employed individuals working abroad, Class 2 contributions may also be available at a lower rate.

The cost-effectiveness of purchasing missing NI years depends on the number of years already accrued and the impact on the starting amount. HMRC's pension check tool can model the impact of additional qualifying years on the projected pension.

The Contracted-Out Deduction Explained

If you worked for a contracted-out COSR scheme, the DWP applies a Contracted-Out Deduction (COD) to your starting amount. This reflects the fact that, during the contracted-out period, you (and your employer) paid reduced NI contributions, and the State ceded its SERPS or S2P obligation to the private scheme.

The COD is a permanent reduction in your new State Pension. It cannot be bought back through voluntary NI contributions — there is no mechanism to "undo" the contracting-out decision retrospectively. The COD represents the estimated value of the State benefits you gave up during the contracted-out period.

For many individuals who worked in large DB schemes throughout their careers, the COD is substantial — potentially £50 to £100 per week or more. The quid pro quo is that the DB scheme is obliged to pay at least the GMP (and usually much more) in retirement.

Understanding your COD is therefore important in the following contexts:

• Retirement income planning: Your State Pension will be lower than your NI record alone suggests. You must factor the private DB pension into your income analysis.
• DB transfer decisions: The DB pension's value includes the obligation to pay at least the GMP — transferring it out into a SIPP eliminates this guarantee and must be weighed against the COD reduction to your State Pension.
• Divorce: The starting amount including COD is used when calculating the capitalised value of State Pension entitlement for the purposes of pension sharing orders.

Additional State Pension: Still Being Paid

The new State Pension replaced SERPS and S2P for people reaching State Pension age on or after 6 April 2016. But for those who reached State Pension age before that date, the old State Pension framework still applies — they receive the basic State Pension plus their Additional State Pension (from SERPS and/or S2P), minus any applicable GMP offset or COD.

For people who reached State Pension age before 2016, the Additional State Pension continues to be paid as part of the State Pension for life. Note that the two elements are uprated differently: the basic State Pension is increased by the triple lock, whereas the Additional State Pension (SERPS/S2P) is uprated only in line with CPI inflation, not the triple lock.

For those who reached State Pension age after April 2016, the SERPS and S2P accrual is captured in the starting amount calculation and becomes part of the single new State Pension figure — it cannot be separately identified in the ongoing pension payment.

Expat Implications

For UK nationals living abroad, the interaction of SERPS/S2P history with the "frozen pension" rules (which prevent State Pension increases for residents in non-reciprocal countries) deserves careful attention. Even a substantial SERPS-derived starting amount will be frozen if you retire in certain countries.

Moreover, for clients who contracted out via COSR and are considering transferring their DB pension to a QROPS, the interaction between the COD, the GMP, and the overseas transfer charge must be properly assessed. The COD reduction to the State Pension represents a permanent cost of contracting out — it cannot be recovered by paying voluntary NI contributions.

How Global Investments Can Help

Global Investments helps clients navigate the complexity of UK State Pension entitlement, particularly those who have moved between UK employment, self-employment, and international roles over a working career.

We work with specialists who can interpret State Pension forecasts, identify the impact of historical contracting-out periods, model the cost-benefit of voluntary NI contributions, and ensure that the State Pension entitlement — including accrued SERPS and S2P rights — is properly reflected in overall retirement income planning.

For clients approaching UK State Pension age while living abroad, we advise on payment arrangements, exchange rate considerations, and the double-taxation implications of UK State Pension income in their country of residence.

Nothing in this guide constitutes personal financial advice. State Pension rules are complex and subject to change. Individual entitlements depend on your specific NI record and working history. Please seek independent guidance from a regulated adviser or consult the DWP and HMRC directly for information about your specific case.