UK Pension Calculator — Projected Pot, State Pension & Retirement Income
The UK pension system is built on three pillars: the State Pension (funded by National Insurance contributions), workplace pensions (auto-enrolled by your employer), and personal pensions or SIPPs that you arrange yourself. This calculator projects how much your pension pot could be worth when you retire, based on your current pot, your monthly contributions, your employer's contribution, and an assumed annual growth rate. It then applies the widely used 4% safe withdrawal rule to estimate your annual drawdown income and adds the full new State Pension of £221.20/week (£11,502.40/year for 2025/26) to give you a realistic total retirement income figure. Rates sourced from gov.uk. Enter your details below to see your personalised projection.
Projected Retirement Summary
| Years to Retirement | 37 years |
| Annual Employee Contribution | £3,600 |
| Annual Employer Contribution | £2,250 |
| Total Employee Contributions | £133,200 |
| Total Employer Contributions | £83,250 |
| Total Investment Growth | £454,296 |
| Projected Pot at Retirement | £685,746 |
Estimated Retirement Income
| Annual | Monthly | |
|---|---|---|
| Drawdown from Pension (4% rule) | £27,430 | £2,286 |
| Full New State Pension (2025/26) | £11,502 | £959 |
| Total Retirement Income | £38,932 | £3,244 |
Year-by-Year Pot Growth
| Year | Age | Opening Pot | Contributions | Growth | Closing Pot |
|---|---|---|---|---|---|
| 5 | 35 | £43,447 | £5,850 | £2,172 | £51,469 |
| 10 | 40 | £87,775 | £5,850 | £4,389 | £98,014 |
| 15 | 45 | £144,351 | £5,850 | £7,218 | £157,419 |
| 20 | 50 | £216,557 | £5,850 | £10,828 | £233,235 |
| 25 | 55 | £308,713 | £5,850 | £15,436 | £329,999 |
| 30 | 60 | £426,330 | £5,850 | £21,316 | £453,496 |
| 35 | 65 | £576,442 | £5,850 | £28,822 | £611,114 |
| 37 | 67 | £647,520 | £5,850 | £32,376 | £685,746 |
Showing every 5th year. Click "Show all years" for the full schedule.
Projections are illustrative only. Growth rate is not guaranteed. State Pension eligibility requires 35 qualifying National Insurance years. The 4% rule is a guideline, not a guarantee. Consult a regulated financial adviser before making pension decisions.
How UK Pensions Work
The UK pension landscape divides into three distinct pillars, each with its own rules, tax treatment, and eligibility criteria.
Pillar 1 — State Pension: The full new State Pension for 2025/26 is £221.20 per week (£11,502.40/year). You build entitlement through qualifying years of National Insurance contributions. You need at least 10 qualifying years to receive any State Pension, and 35 years for the full amount. The State Pension age is currently 66 for both men and women, rising to 67 between 2026 and 2028. You can check your forecast and NI record for free at gov.uk/check-state-pension.
Pillar 2 — Workplace Pensions & Auto-Enrolment: Since 2012, most employees aged 22 to State Pension age earning above £10,000/year must be automatically enrolled into a workplace pension. The minimum total contribution under auto-enrolment is 8% of qualifying earnings (the band between £6,240 and £50,270 for 2025/26): at least 3% from the employer and at least 5% from the employee (though many employers contribute more). Contributions attract income tax relief, making pensions one of the most tax-efficient savings vehicles available.
Pillar 3 — Personal Pensions & SIPPs: A Self-Invested Personal Pension (SIPP) lets you choose your own investments and is available from most major providers. You can contribute up to the annual allowance (£60,000 in 2025/26 or 100% of your earnings if lower) and receive tax relief at your marginal rate. From age 55 (rising to 57 in 2028) you can start drawing from your pension — taking up to 25% as a tax-free lump sum and the rest as taxable income.
The Compound Growth Formula
This calculator uses a standard future value formula with annual contributions. Where PV is your current pension pot, PMT is your total annual contribution (employee + employer), r is the annual growth rate (as a decimal), and n is the number of years to retirement:
FV = PV × (1 + r)^n + PMT × [((1 + r)^n − 1) / r] Where: PV = current pension pot (£) PMT = total annual contributions (employee + employer) r = expected annual growth rate (e.g. 0.05 for 5%) n = years to retirement
The calculator applies this iteratively year by year, compounding the opening pot first and then adding the full year's contributions. The year-by-year table lets you track exactly how much of your final pot comes from contributions versus investment growth — a key insight for understanding the power of starting early.
Worked Example: 35-Year-Old with £15,000 Pot, £300/Month, 5% Employer Match, 5% Growth
Consider a 35-year-old with an existing pot of £15,000, contributing £300/month personally, whose employer contributes 5% of a £45,000 salary, targeting retirement at 67 with a 5% annual growth rate. This gives 32 years of accumulation:
Inputs
Current pot (PV): £15,000
Monthly employee contrib: £300 → £3,600/year
Employer contrib (5%×£45k): £2,250/year
Total annual contrib (PMT): £5,850/year
Growth rate (r): 5% (0.05)
Years to retirement (n): 32
Year-by-year (first 3 years shown):
Year 1: £15,000 × 1.05 + £5,850 = £15,750 + £5,850 = £21,600
Year 2: £21,600 × 1.05 + £5,850 = £22,680 + £5,850 = £28,530
Year 3: £28,530 × 1.05 + £5,850 = £29,957 + £5,850 = £35,807
After 32 years using FV formula:
FV = 15,000 × (1.05)^32 + 5,850 × [((1.05)^32 − 1) / 0.05]
= 15,000 × 4.7649 + 5,850 × [3.7649 / 0.05]
= £71,474 + 5,850 × 75.2988
= £71,474 + £440,498
≈ £511,972
Retirement income (4% rule + State Pension):
4% drawdown: £511,972 × 0.04 = £20,479/year
Full State Pension: £11,502/year
Total annual income: £31,981/year (≈ £2,665/month) This illustrates how two-thirds of the final pot comes from investment growth rather than contributions — a compelling case for starting pension saving as early as possible.
Pension Tax Relief
Tax relief is one of the most powerful features of UK pension saving. The government effectively gives back income tax you have already paid when you contribute to a registered pension scheme:
- Basic-rate taxpayers (20%): For every £800 you pay in, the pension provider claims £200 from HMRC and adds it to your pot — giving you a £1,000 pot contribution for an £800 outlay. This relief is applied automatically ("relief at source").
- Higher-rate taxpayers (40%): You receive the same basic-rate top-up automatically, but can claim a further 20% back via self-assessment, meaning a £1,000 pot contribution effectively costs only £600 out of pocket.
- Additional-rate taxpayers (45%): The effective cost is just 55p per £1 in the pot, with the extra 25% (beyond basic-rate) claimed through self-assessment.
The annual pension allowance for 2025/26 is £60,000 (or 100% of your earnings if lower). This covers all contributions — yours, your employer's, and any government top-up. If you have not used your full allowance in the previous three tax years, you can "carry forward" the unused balance to the current year, allowing contributions above the standard limit. This is particularly useful if you receive a large bonus or lump sum you wish to shelter from tax.
High earners with adjusted income above £260,000 face a tapered annual allowance, which reduces by £1 for every £2 of income above that threshold down to a minimum of £10,000. If you are in this bracket, take advice from a regulated financial adviser.
The 4% Safe Withdrawal Rate
The 4% rule originates from research by financial planner William Bengen in 1994. He analysed historical US market data and found that retirees who withdrew 4% of their initial portfolio per year — adjusting annually for inflation — did not run out of money over any 30-year period in the data set. This became known as the "Bengen rule" or "4% rule" and has been widely used as a starting point for retirement income planning.
The rule has important limitations. It was based on US market returns and may be optimistic for UK or global investors. More recent research, accounting for lower expected future bond returns and longer life expectancies, suggests a 3.5% withdrawal rate is more appropriate for a 30-year or longer retirement. UK-specific research from independent financial planners broadly supports a 3.5–4% range for someone retiring at 67 today.
Additionally, the 4% rule assumes you draw a constant real amount each year. In practice, most retirees spend more in early retirement (travel, home improvements) and less in later years. A flexible drawdown strategy — drawing more when markets perform well and less in downturns — often allows a slightly higher sustainable withdrawal rate. This calculator uses 4% as a straightforward illustration; it is not personal financial advice.
State Pension in Detail
The new State Pension applies to everyone who reached State Pension age on or after 6 April 2016. The full rate for 2025/26 is £221.20 per week (£11,502.40/year). This is paid by the government from general taxation and National Insurance receipts — it is not drawn from any personal fund.
To receive the full amount you need 35 qualifying years of National Insurance contributions or credits. Qualifying years can come from: employment with earnings above the Lower Earnings Limit (£6,396 for 2025/26); self-employment (Class 2 NI); NI credits while claiming certain benefits (Child Benefit for a child under 12, Jobseeker's Allowance, Universal Credit, or Carer's Allowance); or voluntary Class 3 contributions to fill gaps.
The State Pension is protected by the triple lock, which means it rises each April by the highest of: CPI inflation, average earnings growth, or 2.5%. You can check your personal State Pension forecast and NI record online via gov.uk/check-state-pension — this takes about five minutes and is highly recommended for anyone planning their retirement.
Frequently Asked Questions
What is the full new State Pension in 2025/26?
The full new State Pension for 2025/26 is £221.20 per week, which equals £11,502.40 per year. This rate applies to people who reached State Pension age on or after 6 April 2016 and have made at least 35 qualifying years of National Insurance (NI) contributions. The rate is normally updated each April under the triple lock guarantee — which increases the State Pension by the highest of earnings growth, CPI inflation, or 2.5%. For the current rate, always verify on the official gov.uk website as the figure changes each April when the new tax year begins. If you have fewer than 35 qualifying years but at least 10, you will receive a proportionate amount. For example, 17.5 qualifying years (half of 35) would give you roughly half the full rate, or about £110.60 per week.
How many qualifying years of National Insurance do I need for the full State Pension?
You need exactly 35 qualifying years of National Insurance (NI) contributions or credits to receive the full new State Pension. A qualifying year is typically a tax year in which you earned at least £6,396 (the Lower Earnings Limit for 2025/26) and paid NI contributions, or were credited with NI via a benefit claim (such as Child Benefit, Jobseeker's Allowance, or carer's credits). You also need a minimum of 10 qualifying years to receive any State Pension at all — below 10 years you receive nothing. You can check your NI record and State Pension forecast for free at gov.uk/check-state-pension. If you have gaps in your NI record, you may be able to pay voluntary Class 3 NI contributions to fill them, which is often highly cost-effective.
What is the annual pension allowance for 2025/26?
The annual pension allowance for 2025/26 is £60,000, or 100% of your annual earnings if that is lower. This is the maximum you can contribute to all your pension schemes (personal and workplace combined) in a single tax year while still receiving tax relief. It covers both your own contributions and any employer contributions. If you exceed the annual allowance, you will face an annual allowance charge — effectively a tax on the excess. However, if you did not fully use your allowance in the previous three tax years, you can carry forward the unused balance and add it to the current year's limit. This is particularly useful for those receiving a large bonus or winding up a business. Note that high earners (adjusted income above £260,000) may face a tapered annual allowance that reduces down to a minimum of £10,000.
At what age can I access my private pension?
Under current legislation, the minimum pension access age is 55. However, the government has confirmed that this will rise to 57 on 6 April 2028. After that date, you will generally need to be at least 57 to draw from a private or workplace pension without incurring unauthorised payment charges. There is an exception for those with a protected pension age or those who retire in ill health. The State Pension age is currently 66 for both men and women, with a planned increase to 67 between 2026 and 2028, and then to 68 between 2044 and 2046 (though the exact timetable remains under review). Accessing your pension early will significantly reduce how long your money lasts, so the general advice is to leave it invested as long as possible to maximise compound growth.
What is the triple lock on State Pension?
The triple lock is a policy commitment introduced in 2011 that guarantees the State Pension rises each April by the highest of three measures: average earnings growth (measured over May to July), CPI inflation (measured in September), or 2.5%. The triple lock was designed to protect pensioners' purchasing power and prevent State Pension from falling in real terms. In practice, it has caused the State Pension to rise considerably faster than general wages in some years. The policy has been politically contentious due to its cost to the public finances, and there has been ongoing debate about whether to retain, modify, or scrap it. For the 2025/26 tax year the rate was set at £221.20/week, reflecting the highest of the three qualifying increases for that round. Future rates are not guaranteed and depend on which political party is in government and the economic conditions at the time.
How does pension tax relief actually work?
When you contribute to a registered pension scheme, the government tops up your contribution to account for income tax you have already paid on those earnings. For a basic-rate (20%) taxpayer contributing via a personal pension or SIPP, the pension provider automatically claims 20% basic-rate relief from HMRC and adds it to your pot — meaning an £800 contribution becomes a £1,000 pot contribution. Higher-rate (40%) and additional-rate (45%) taxpayers can claim extra relief through their self-assessment tax return: a 40% taxpayer can claim back an additional 20% on top of the 20% already added, making the effective cost of a £1,000 pension contribution just £600. Workplace pensions via salary sacrifice work differently — contributions come off your gross pay before tax and NI are applied, so you also save NI as well as income tax. The annual allowance for 2025/26 is £60,000 (or 100% of earnings if lower).