Question 1

How much do I need in my pension to retire in the UK?

Accepted Answer

A common rule of thumb is that you need 25× your target annual retirement income in your pension pot — this comes from the 4% safe withdrawal rate. So a £30,000/year income target implies a £750,000 pot. If you include the full new state pension (£11,502/year for 2025/26), the private pot requirement drops to around £462,000. These figures ignore inflation — if you want £30,000/year in today's money and retire in 30 years, your future pot needs to be larger to match the same purchasing power.

Question 2

What is the 4% safe withdrawal rate?

Accepted Answer

The 4% rule comes from the Trinity Study, a piece of US academic research that looked at historical portfolio performance and asked what withdrawal rate would have survived a 30-year retirement in the worst-case scenario. Withdrawing 4% of your starting pot and adjusting for inflation each year was sustainable across almost every historical period. It is a rule of thumb, not a guarantee — in a low-return environment 3% is a more cautious starting point, and sequence-of-returns risk (a bad first decade) can break the rule.

Question 3

Should I include the state pension in my retirement plan?

Accepted Answer

Yes — most UK retirees will receive the state pension, and it materially reduces the pot you need from private pensions. The full new state pension is £11,502/year for 2025/26 and rises with the triple lock. Two caveats: you only start receiving it at state pension age (currently 67, rising to 68), so if you retire earlier your pot must bridge the gap until then; and you need 35 qualifying years of National Insurance contributions to get the full amount. Check your forecast at gov.uk/check-state-pension.

Question 4

How do I work out the monthly contribution I need?

Accepted Answer

This calculator uses the standard future-value-of-annuity formula. Given your current pot, the number of years to retirement, and an assumed growth rate, it solves for the monthly contribution that would take you from where you are today to the required pot at retirement. In plain terms: the maths works out what you'd need to save each month so that your current pot plus contributions plus investment growth equal the target. Employer contributions, tax relief, and salary sacrifice all count toward this number.

Question 5

Does this calculator account for inflation?

Accepted Answer

Yes — the target income you set is treated as today's money. The calculator future-values it using your chosen inflation rate (default 2.5%, roughly the Bank of England target) so the required pot maintains your target's purchasing power. The contribution and pot figures are nominal, meaning they're the actual pounds you'd see on a pension statement in the future rather than today's-money equivalents.

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