State Pension Starting Amount Calculator

The State Pension starting amount calculator works out how much UK State Pension you are on track to receive when you reach State Pension age, based on your National Insurance record up to 5 April 2016 and any contributions after that date. You enter your date of birth, your National Insurance record details, and whether you were contracted out, and it returns your estimated weekly pension amount in today’s money. This guide explains how the calculation works, what the figure means, and the common pitfalls that lead people to misunderstand their result.

Formula

The starting amount is the higher of two figures, capped at the full new State Pension (£155.65 per week in 2024/25). The two figures are:

• Foundation amount (old rules): (NI years before 6 April 2016 ÷ 30) × £155.65
• New-style amount: (NI years before 6 April 2016 ÷ 35) × £155.65 + (NI years after 5 April 2016 × £5.82)

Where:

• NI years before 6 April 2016 – full years of National Insurance contributions or credits up to that date (maximum 30 for the old calculation, but the new-style calculation uses the same years out of 35).
• NI years after 5 April 2016 – full years from 2016/17 onwards (each adds £5.82, which is 1/35 of the full rate).
• £155.65 – full new State Pension weekly rate for 2024/25 (the rate is usually uprated each April).

The calculator assumes you were not contracted out. If you were, the actual starting amount may be lower because you paid reduced National Insurance and received a separate Additional State Pension or protected payment. This calculator gives the theoretical maximum; your official statement from HMRC will reflect any contracting-out deductions.

Worked Example

Using the default values: born 6 April 1960, 30 years of NI before 2016, not contracted out, 5 years after 2016.

1. Foundation amount: (30 ÷ 30) × £155.65 = £155.65
2. New-style amount: (30 ÷ 35) × £155.65 + (5 × £5.82) = £133.41 + £29.10 = £162.51
3. Starting amount: the higher of the two, but capped at £155.65, so £155.65.

That matches the calculator output. Note that the new-style amount exceeds the cap because the post-2016 years are added on top of a full pre-2016 record. In practice, if you already have 30 pre-2016 years, you cannot add post-2016 years to push above the full rate – the cap applies.

How the State Pension Transition Works

The current State Pension system began on 6 April 2016. Everyone who reached State Pension age on or after that date has their pension calculated under the “new� rules, but with a transitional starting amount based on their NI record up to 5 April 2016. The starting amount is the higher of:

• The old-style basic pension plus Additional State Pension (SERPS/S2P) – the “foundation amountâ€�.
• The new flat-rate amount based on 35 qualifying years.

If your foundation amount is higher than the new-style amount, you get a “protected payment� that keeps the excess. If the new-style amount is higher, you get that instead. After 2016, every qualifying year adds £5.82 (1/35 of the full rate) until you reach the full amount or State Pension age, whichever comes first.

What Your Starting Amount Means

Your starting amount is not necessarily what you will receive – it is the baseline at 6 April 2016. From that date, you add post-2016 years (each adds £5.82) until you hit the full rate. If you have gaps in your NI record, you may be able to pay voluntary contributions to fill them, but only if you are within the allowed time limits (usually the last 6 years, with some transitional rules for pre-2016 gaps).

The figure is in today’s money – the actual pension you receive will be uprated each year by the Triple Lock (the highest of inflation, average earnings growth, or 2.5%). So the calculator gives a comparable figure, not the exact future amount.

Common Mistakes and Misconceptions

• Assuming 30 years gives the full pension: Under the new system, you need 35 years. The 30-year rule only applies to the old basic pension calculation.
• Ignoring contracting out: If you were contracted out (usually through a workplace or personal pension), your NI contributions were lower and your starting amount will be reduced. The reduction is roughly equal to the Additional State Pension you gave up.
• Counting years after 2016 incorrectly: Each post-2016 year adds £5.82, but only up to the full rate. If you already have 35 pre-2016 years, you cannot add more.
• Rounding too early: The official calculation uses exact pence, so rounding intermediate steps can give a slightly different result.

How to Get Your Official Starting Amount

The only authoritative way to know your starting amount is to get a State Pension statement from HMRC. You can request one online via GOV.UK, by phone, or by post. The statement shows your NI record, your starting amount at 6 April 2016, and how much you could increase it by making voluntary contributions. The online service is quick and usually gives an immediate result. If you have complex circumstances (e.g., married women’s reduced rate, divorce, or overseas insurance), the statement will reflect those.

Frequently Asked Questions

Can I get more than the full State Pension?
No, the maximum weekly amount is £155.65 (2024/25). You cannot exceed it, even with extra NI years. If you have a protected payment from the 2016 transition, that is part of your starting amount and may bring you above the full rate, but that is only for those who had built up more under the old system.

What if I have gaps in my NI record?
Gaps can be filled by paying voluntary Class 3 contributions, but only for the last 6 tax years (you can go back further in some cases, e.g., if you were caring for children or disabled relatives). The cost is around £17.45 per week (2024/25), and it may be worth it if you need a few years to reach the full pension. Check with HMRC before paying.

Does my starting amount change if I work after State Pension age?
No, you cannot add NI years after you reach State Pension age. However, you can defer claiming your pension, which increases the weekly amount by about 5.8% for each year you delay (or a lump sum if you defer for at least 12 months).

How does contracting out affect my starting amount?
If you were contracted out, you paid lower NI and built up a private pension instead of Additional State Pension. Your starting amount is reduced by a “contracted out deduction� (COD). The reduction can be significant – sometimes £30-£50 per week. The only way to know the exact figure is to check your statement.

Is the calculator accurate for people who reached State Pension age before 2016?
No. If you reached State Pension age before 6 April 2016, you are under the old system (basic pension + Additional State Pension). This calculator only applies to the new system. Use the old rules if you were already claiming before that date.

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in dob | Date of birth | - | 1960-04-06 | 1950-01-01 | 2006-12-31
in ni_before | Years of NI before 6 Apr 2016 | yr | 30 | 0 | 60
sel contracted | Contracted out? | No=0, Yes=1
in ni_after | Years of NI after 5 Apr 2016 | yr | 5 | 0 | 20
out amount | Starting amount | £/week | round(min(155.65, max(155.65 * ni_before / 35, 155.65 * ni_before / 30 + 5.82 * ni_after)), 2) | 2
out foundation | Foundation amount (pre-2016) | £/week | round(155.65 * ni_before / 30, 2) | 2
out new_style | New-style amount (post-2016) | £/week | round(155.65 * ni_before / 35 + 5.82 * ni_after, 2) | 2