Starting your pension five years later than planned could cost you nearly £100,000 by retirement. That’s not a scare headline — it’s what the numbers show when you run the sums on compound growth at typical contribution levels. A 35-year-old saving £200 a month with 5% annual growth ends up with roughly £180,000 by age 65, according to data from Pocketwise’s analysis of common pension mistakes. Start at 45 with the same amount and you’re looking at around £90,000. The difference is a whole house deposit, lost because of timing.
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This article is general information only and does not constitute professional advice. For your specific situation, consult a qualified professional.
These aren’t abstract figures. The £27 billion in unclaimed pots represents individual people who have moved house, changed jobs, or simply lost track of what they saved. The average person accumulates 11 different pension pots over their career, and many of those are worth over £10,000 each. Combine that with the 1-in-5 chance of being targeted by a scam, and it’s clear why pension planning needs more attention than most people give it. The basics of investing for beginners cover the same principles that apply here — start early, keep costs low, and stay consistent. Here’s what you actually need to know.
What compound growth actually means for your pension
Compound growth is the reason a small delay today costs you five figures later. It’s not complicated — your investment returns start earning returns of their own, and over time that snowball effect dwarfs anything you could achieve by saving more later.
What I tend to notice is that people understand the idea in theory but don’t run the numbers on their own situation. A 55-year-old starting with £200 a month at 5% growth ends up with roughly £30,000 by 65. A 25-year-old doing the same ends up with roughly £215,000. That’s not a better investment strategy — it’s simply 40 extra years of compounding. The financial freedom strategies for your 30s make the same point: time is the one thing you can’t buy later.
Contribution levels, starting ages, and what they cost you
The numbers tell a clear story. The table below shows what happens to a £200 monthly contribution at 5% annual growth depending on when you start. The pattern is consistent: every ten-year delay roughly halves your final pot.
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| Start Age | Monthly Contribution | Pot at 65 (5% growth) |
|---|---|---|
| 25 | £200 | ~£215,000 |
| 35 | £200 | ~£180,000 |
| 45 | £200 | ~£90,000 |
| 55 | £200 | ~£30,000 |
Notice the jump from age 35 to 45: the pot drops from £180,000 to £90,000. That’s a £90,000 difference for ten years of delay. The jump from 45 to 55 is even steeper proportionally — from £90,000 to £30,000. What this means in practice is that someone who puts off pension planning until their mid-40s needs to contribute roughly double what a 35-year-old contributes to end up in the same place.
The auto-enrolment minimum of 8% total contributions (5% from you, 3% from your employer) is a starting point, not a finish line. The Pensions and Lifetime Savings Association estimates that a single person needs around £31,700 a year for a moderate retirement and £43,900 for a comfortable one. The full new State Pension in 2025/26 is £11,973 a year — which covers about a third of that moderate target. The rest has to come from your own savings, and the numbers above show how quickly the gap widens if you delay.
Errors and gaps that cost UK savers most
Opting out of the workplace pension
Opting out of your workplace pension means giving up your employer’s contribution. Under auto-enrolment, your employer pays at least 3% of qualifying earnings into your pot. On a £30,000 salary, that’s £900 a year of free money. Over 40 years with growth, it adds up to well over £80,000 lost, according to Pocketwise’s analysis of opting out. The common reason people give — “I can’t afford it right now” — ignores the fact that your employer’s contribution disappears entirely. What tends to make more sense is to stay enrolled even at a lower contribution rate, if that’s what it takes to keep the employer money flowing in.
Ignoring fees and paying for underperformance
Pension charges are the silent drag on your savings. The difference between a 0.5% annual fee and a 2% fee over 30 years, with £200 monthly contributions and 5% growth, is £34,000 — the 0.5% fee leaves you with £100,000, while the 2% fee leaves you with £66,000. Workplace pension charges have been capped at 0.75% since auto-enrolment was introduced, but older schemes and some personal pensions can still charge around 2% annually. Restless reports that moving from a 2% scheme to a low-cost SIPP could save roughly £22,000 on a £250,000 pot over 15 years. The fix is straightforward: check your annual management charge, your platform fee, and any transaction costs. If they’re above 1%, you’re likely paying too much.
Cashing in too much too soon
Taking the full 25% tax-free lump sum at age 55 (rising to 57 in 2028) is standard advice, but what happens to the rest matters. If you withdraw the remaining 75% as cash in one tax year, the whole amount is added to your income and taxed at your marginal rate. That could push you from basic rate (20%) into higher rate (40%) on a big chunk of it. Charles Stanley’s guidance on retirement mistakes explains that up to 75% of a pension pot taken as cash is taxable and can push you into a higher tax band. Phased drawdown — taking the tax-free cash in chunks across multiple tax years — keeps more of your money working inside the pension wrapper and spreads the tax liability. What I’d watch out for is the Money Purchase Annual Allowance (MPAA): once you flexibly access taxable pension income, your annual allowance for future contributions drops to £10,000, and you lose the ability to carry forward unused allowances from the previous three tax years.
Losing track of old pensions
Every time you change jobs and move house, you risk losing sight of a pension pot. The Government’s Pension Tracing Service is the free tool designed to solve this, but most people don’t use it until they’re close to retirement. By then, the pot may have been sitting in a default fund with high charges for years. The research suggests the average person has 11 pension pots over their career, and many of those are worth more than £10,000. Consolidating old pensions into a single low-cost SIPP or your current workplace scheme makes them easier to manage, but don’t transfer a defined benefit (final salary) pension without first taking independent financial advice — if it’s worth over £30,000, it’s a legal requirement to get advice before transferring.
How to fix your pension plan in practice
Finding your lost pensions
The Pension Tracing Service on GOV.UK is the starting point. You’ll need the name of your former employer or the pension scheme name if you remember it. The service searches a database of over 200,000 schemes and gives you the contact details for each one. You then contact the scheme directly to request a current value and a statement of benefits. Keep a record of every pension you find — the scheme name, policy number, and current value — and update it whenever you change jobs.
Checking fees and switching providers
Locate your latest annual statement from each pension. Look for the “annual management charge” or “total expense ratio” — this is the percentage deducted from your pot each year. If it’s above 0.75%, compare it to what’s available from low-cost providers. A SIPP from a platform like Vanguard or Fidelity typically charges around 0.15% to 0.40% for the fund itself, plus a platform fee. Before transferring, check whether your current scheme charges an exit fee and whether you’ll lose any valuable benefits like a guaranteed annuity rate or a protected tax-free cash entitlement. If you’re unsure, a financial adviser can run the comparison for you.
Planning tax-efficient withdrawals
You can take 25% of your pension pot as a tax-free lump sum. The remaining 75% is taxable as income when you withdraw it. The most tax-efficient approach is usually to phase your withdrawals — take the tax-free cash in stages across several tax years, and only take taxable income when your total income for the year is low enough to stay within the basic-rate band. If you’re still working or have other income, factor that into the calculation. The JustAnswer Finance service connects you with tax professionals who can run through your specific withdrawal scenario, which is worth doing before you commit to a strategy.
What’s changing in 2027 and 2028
Two upcoming rule changes matter for anyone planning their retirement. First, the minimum pension access age rises from 55 to 57 in April 2028. If you’re currently in your 40s, you won’t be able to touch your pension until 57 unless you have a protected pension age. Second, from April 2027, inherited pensions will be included in your estate for inheritance tax purposes. Currently, unused pension pots can pass to beneficiaries tax-free, but the new rules mean they’ll be subject to 40% inheritance tax if your estate exceeds the nil-rate band. Restless highlights that these changes make it essential to review your beneficiaries and consider how your pension fits into your wider estate plan.
Frequently Asked Questions
Can I opt back into my workplace pension after opting out? ▾
What if I have gaps in my National Insurance record for the State Pension? ▾
Should I consolidate all my old pensions into one? ▾
What triggers the Money Purchase Annual Allowance? ▾
Do I need advice to transfer a defined benefit pension? ▾
How do I check my State Pension forecast? ▾
The real cost of waiting is not what you think
The most expensive pension mistake isn’t picking the wrong fund or withdrawing at the wrong time. It’s the assumption that you have time to fix it later. The numbers are consistent across every source: a ten-year delay halves your pot, high fees silently drain it, and lost pensions sit untouched for decades. The one thing that changes the outcome more than anything else is starting today, with whatever you can afford, and then reviewing it once a year. The money habits that keep you poor often come down to the same pattern — knowing what to do and putting it off.
Remember: this article is general information only. For advice on your specific situation, speak to a qualified professional.
If this was useful, you might also want to read The Silent Retirement Killer: Inflation and How to Outsmart It in the UK.
Sources and Further Reading
Financial Planning for Families: Securing Your Children’s Future in the UK — A practical look at how pensions fit into a wider family financial plan, including inheritance considerations and intergenerational wealth.
Charles Stanley (2025). Retirement mistakes to avoid. 🔗
Regulated Advice (2025). Pension Planning Pitfalls. 🔗
Pocketwise (2025). Common Pension Mistakes UK. 🔗
Restless (2025). Big Pension Mistakes and How to Avoid Them. 🔗
