"Just combine them into one pot." It is the advice you will hear the moment you mention that you have picked up a few pensions along the way. Fewer statements, one login, one balance to watch. It sounds tidy, and tidy sounds sensible.

But the reality is more layered than that. Consolidating old pensions can genuinely help. It can also quietly cost you something valuable if you move the wrong pot without checking what is inside it first.

So let's walk it through properly, using a clearly-fictional saver to keep the maths honest.

Meet Tom, 52, with four pots and a shrug

Tom lives in England and has had five jobs over thirty years. Somewhere along the way he accumulated four separate workplace pensions, all defined contribution (DC) pots, meaning each one is a sum of money invested on his behalf rather than a promised income for life.

Here is roughly what he is working with:

• Pot A: about £62,000, from an employer he left in 2009, charging around 1.0% a year.
• Pot B: about £48,000, charging around 0.75% a year.
• Pot C: about £41,000, a newer scheme charging around 0.45% a year.
• Pot D: about £29,000, the oldest of the four, charging around 0.9%, and old enough that it might carry a guarantee worth checking.

That is roughly £180,000 spread across four providers, four fee levels, and four sets of paperwork Tom has not opened in years.

He also has a fifth pension from his longest job, a defined benefit (DB), or "final salary", scheme. That one is a different animal entirely, and we will come back to why it stays exactly where it is.

Step one: actually find the pots

You cannot make a decision about money you have lost track of. Before anything else, Tom needs a complete picture.

• Dig out old paperwork and annual statements for each scheme, or log in to each provider.
• Use the government's free Pension Tracing Service to hunt down any workplace pot whose provider he has lost contact with.
• Separately, check his State Pension forecast and National Insurance record on GOV.UK, because the State Pension sits alongside these pots and shapes the whole plan.

Lost and forgotten pots are one of the most common reasons people underestimate what they actually have. Finding them is worth doing even if Tom never consolidates a single pound.

Step two: check what each pot is really made of

This is the step most "just combine them" advice skips, and it is the one that matters most. Some older pensions carry features that are worth real money, and moving the pot away forfeits them permanently. Before transferring anything, Tom should check each pot for:

• A guaranteed annuity rate (GAR): an older promise to convert the pot into income at a rate far better than today's market. Pot D is exactly the vintage where this can appear. A GAR can be worth more than the headline pot value, so it is checked first, not last.
• Protected tax-free cash: some older schemes allow more than the standard 25% tax-free lump sum. Consolidating can reset it back to 25%.
• A protected early pension age: a right to access the pot before the normal minimum pension age, which is currently 55 and rising to 57 from April 2028.
• Exit penalties: some legacy plans charge to leave. That cost has to be weighed against any saving.

The rule of thumb is simple. Guarantees and protections are checked before fees, because no fee saving is worth handing back a benefit you cannot buy back.

The defined benefit pension: leave it put

Tom's fifth pension, the final-salary one, does not belong in this conversation at all.

A defined benefit pension pays a guaranteed, inflation-linked income for life. That guarantee is extraordinarily valuable and almost never worth giving up. In the UK, transferring a defined benefit (or other safeguarded-benefits) pension worth more than £30,000 legally requires you to take regulated financial advice from an FCA-authorised adviser first. That is the law, not a suggestion.

Optiml does not provide that advice and is not a substitute for it. The default position on a DB or guaranteed pension is that it stays exactly where it is. So for the rest of this walkthrough, Tom's DB pension sits untouched, and we only look at the four DC pots.

Step three: now weigh consolidation as a trade-off

Only once the guarantees are checked does the actual consolidation question make sense. There are legitimate reasons people bring DC pots together:

• Lower or duplicated fees. Four providers can mean four charging structures, some of them dated and expensive.
• Simpler management. One pot is easier to monitor, rebalance, and eventually draw from.
• One coherent drawdown strategy. When retirement comes, sequencing income across four scattered pots is far harder than from one.
• No more lost pots. Consolidated money does not go missing.

None of that is a recommendation to consolidate. It is a list of trade-offs to weigh against the guarantees, protections, and penalties from step two. For some pots the maths favours moving. For others, the guarantee wins and the pot stays.

Where fees do come into it, the numbers can be larger than they look. Here is an illustrative example on Tom's roughly £180,000, comparing a 1.0% annual charge with a 0.35% one over the 15 years until he reaches State Pension age at 67.

These figures are illustrative only, on stated assumptions: a 5% gross annual return, no further contributions, charges held flat, and 2026/27 rules. They are not a forecast or a guarantee. Investments can fall as well as rise, and real returns will vary. But the shape of the point holds: on a six-figure pot over fifteen years, a fraction of a percent in fees compounds into a meaningful number. That is the reason fees are worth checking, and also the reason a guarantee has to be worth more than the fee saving before you give it up.

Where a whole-retirement view comes in

Here is the harder truth. Consolidation is not really a "four pots into one" question. It is a "how do all my accounts work together across my whole retirement" question, and that is bigger than any single fee comparison.

This is exactly the kind of decision Optiml UK is being built to model. When Optiml launches in the UK, it is designed to let you bring your pensions, ISAs, the State Pension, and other investments into one plan and see the lifetime impact of a change on your own numbers, not a generic example. The idea is to model how fees compound, how the Withdrawal Optimiser would sequence income across your pots to lower lifetime tax, and how the Pension Drawdown Bridge could fill the gap between an early retirement and your State Pension age.

Optiml plans, it does not recommend specific funds or providers, and it is not regulated financial advice. What it aims to give you is the full picture, so a decision like Tom's is made with the maths in front of you rather than a shrug.

Because in the end, the goal was never a shorter list of pensions.

It's not about having fewer pots. It's about having one plan.