State pension · Guide

New state pension vs old state pension — what's the difference?

April 2016 was a hard cut-off. Reach state pension age before that date and you get the old two-part system. Reach it on or after that date and you get the new single-tier pension. The amounts, qualifying rules, and top-up options are all different.

By Pension Bible editorial team·Last reviewed 9 April 2026·6 min read

The April 2016 transition

On 6 April 2016, the UK government introduced the new state pension, replacing what is now referred to as the "old" or "basic" state pension. The switch was not a reform that grandfathered in existing retirees — it was a hard line. Which side of that line you fall on determines which system you are in.

• New state pension: for those reaching state pension age on or after 6 April 2016 — men born on or after 6 April 1951, women born on or after 6 April 1953
• Old (basic) state pension: for those who reached state pension age before 6 April 2016 — men born before 6 April 1951, women born before 6 April 1953

If you are currently working and still some years from retirement, you will receive the new state pension. The old system is increasingly a historical matter — the youngest people currently receiving the basic state pension are now in their late 70s.

Who gets what

Old state pension (pre-2016 retirees)

The old system had two components:

1. Basic state pension: A flat-rate amount based on qualifying years. The 2025/26 rate is £169.50/week. You needed 30 qualifying years for the full amount.
2. Additional state pension: An earnings-related top-up built up through SERPS (before 2002) and S2P (2002–2016). The amount varied significantly based on earnings and whether the person was contracted out.

Many older retirees receive a total above £169.50/week once the additional state pension is included. Some receive significantly more. A few receive less if they were contracted out for many years.

New state pension (post-2016 retirees)

The new system is a single tier. There is one figure, and the maximum is £221.20/week in 2025/26. You need 35 qualifying years for the full amount and at least 10 qualifying years for anything at all.

There is no earnings-related component. Contracting-out history is folded into the starting amount calculation.

Transitional arrangements and starting amounts

The 2016 switch could not simply ignore the NI records people had already built up under the old rules. The solution was a transitional calculation for people who had any qualifying years before 6 April 2016.

For these individuals, the government calculated a starting amount at April 2016 — the higher of two figures:

1. What the old basic state pension rules would have given them at that point (including any additional state pension)
2. What the new state pension rules would give them for the same qualifying years

If the starting amount was already at or above the full new state pension (then £155.65/week), no further increases are possible through additional qualifying years — the pension is already at the maximum. If it was below, each additional qualifying year after April 2016 adds 1/35th of the full amount.

People with high additional state pension entitlements from the old system sometimes have a starting amount above the new state pension full rate. This surplus is protected — they keep it.

People who were contracted out for significant portions of their career may have a starting amount below the new state pension rate, because the contracting-out deduction (the COPE) reduces the calculation. Each post-2016 qualifying year helps close that gap.

Use the state pension forecast calculator to see your own starting amount and projected entitlement.

Triple lock on both

Both the old basic state pension and the new state pension are uprated each April by the triple lock — the higher of:

• Average earnings growth
• CPI inflation
• 2.5%

The triple lock applies to the full amounts in both systems. The old basic state pension and the new state pension are both protected by the same mechanism. This is significant because it means state pension income tends to keep pace with earnings over the long run, making it more inflation-resistant than most private pension drawdown strategies.

The triple lock is government policy and could in principle be changed, reduced, or abolished by a future government. It has been politically contentious — the earnings component was temporarily suspended in 2022 — but has so far survived as the uprating mechanism for both state pension systems.