Master trusts — what are they? Updated for 2026/27

If your workplace pension is with a provider like NEST, The People's Pension, Now Pensions or Smart Pension, you're in what's called a master trust — even if your employer never used that term when they set up your pension. Master trusts have quietly become the backbone of workplace pension saving in the UK since auto-enrolment began, holding the pension savings of millions of employees across tens of thousands of different employers. This guide explains what a master trust actually is, why they exist, the major providers you're likely to come across, how they're regulated to keep your money safe, what happens to your pot when you change jobs, and how their charges typically work.

What a master trust actually is

A master trust is a single, large occupational pension scheme used by many unconnected employers at the same time, rather than each employer running its own dedicated scheme. Structurally, it's still a trust-based pension — meaning it's legally set up under trust law, with independent trustees whose job is to look after members' interests — but instead of one trust serving one employer, a master trust serves potentially thousands of employers, each with their own "section" or grouping of members inside the same overall scheme. From your point of view as a member, it feels very similar to any other workplace pension: you and your employer pay contributions in, the money is invested, and you access it under normal pension rules from age 55, rising to 57 from 2028. The main difference is behind the scenes, in who's running the scheme and how many other employers share it.

Why master trusts exist

When auto-enrolment was introduced from 2012, it created an enormous practical problem: every employer in the UK, from huge corporations down to businesses with a single employee, was suddenly required to provide a workplace pension. It would have been hugely impractical, and expensive, for every small business to set up and run its own bespoke pension scheme, complete with its own trustees, governance, administration and investment options. Master trusts solved this by letting many employers share one professionally run scheme, spreading the cost of good governance, administration and investment management across a huge number of members. For a small employer, joining an established master trust is usually far simpler and cheaper than building a scheme from scratch, which is exactly why master trusts have become the default choice for the vast majority of smaller and medium-sized employers meeting their auto-enrolment duties.

The major UK master trusts

There are a number of master trusts operating in the UK, but a handful dominate by membership numbers, largely because they were positioned early on as straightforward options for employers meeting their auto-enrolment obligations.

Beyond these four, several other master trusts operate in the UK, including ones run by large insurers offering master trust arrangements as one of several workplace pension options for employers. Which master trust your employer uses generally comes down to a choice they made when setting up their pension scheme, based on factors like cost, investment options, administration quality and digital tools — it isn't something you as an employee typically get to choose yourself while employed there.

How master trusts are regulated

Because master trusts hold the retirement savings of so many people across so many employers, they're subject to a specific authorisation regime run by The Pensions Regulator (TPR). Since 2019, every master trust operating in the UK has had to be formally authorised by TPR, demonstrating that it meets strict standards covering the fitness and propriety of the people running it, the scheme's financial sustainability, the adequacy of its systems and processes, and a credible plan for what would happen to members' pots if the scheme ever needed to wind up. Master trusts that couldn't meet these standards when the regime was introduced had to exit the market, consolidating many smaller, less robust schemes into a smaller number of well-regulated, well-capitalised providers. TPR continues to supervise authorised master trusts on an ongoing basis, and any material changes to how a master trust is run generally require fresh regulatory approval. This gives members a meaningful degree of protection and oversight that goes beyond what was typically in place for older, less formally regulated workplace pension arrangements.

Changing jobs: what happens to your pot

If you leave an employer and your old and new employer both happen to use the same master trust, your existing pot can often simply continue under the new employer's section of the scheme, sometimes with minimal paperwork, since you're technically already a member of the same overall trust. If your new employer uses a different master trust or pension provider altogether, your old pot doesn't move automatically — it stays where it is, invested and still belonging to you, while any new contributions from your new job go into the new scheme instead. This is one of the most common reasons people end up with several separate pension pots by the time they retire, each from a different employer's chosen scheme.

• 1

  Same master trust at both employers — your pot typically continues in the same scheme, often without you needing to do anything beyond confirming your new employer's contributions.

• 2

  Different master trust or provider at your new employer — your old pot stays put and keeps growing (or shrinking) with investment performance, while a brand new pot starts up for contributions from your new job.

• 3

  Consolidating old pots — you can usually choose to transfer old DC pots into your current scheme, or into a single personal pension, to make them easier to track — see our guide on pension consolidation for the pros, cons and process involved.

Typical master trust charges

Master trust charges are usually expressed as an annual percentage of your pot's value, sometimes combined with a small flat fee, and they're deducted automatically rather than billed to you separately. For the default fund used to receive auto-enrolment contributions, charges are legally capped at 0.75% of the fund's value per year — this cap exists specifically to protect auto-enrolled members, many of whom never actively chose their scheme or reviewed its charges, from being placed into an expensive default option. Charges outside the default fund, or for additional services, aren't subject to the same cap, so it's worth checking your own scheme's charging structure via your annual statement or provider portal, particularly if you've chosen to move into a non-default fund (see our guide on investment options for more on fund choices).

Even small differences in charges compound over a long career in the same way investment returns do, so a 0.3% difference in annual charge, sustained over several decades, can meaningfully affect your final pot size — though charges are only one factor, and a slightly higher charge tied to a fund with genuinely better long-term performance and service isn't automatically the wrong choice.

Why this matters for you

Understanding that your workplace pension sits inside a master trust helps explain a few things that can otherwise seem confusing: why your pension provider might be a name you don't recognise as your employer's own brand, why the scheme feels broadly similar if you move to another employer using the same provider, and why regulatory oversight of these schemes is now quite substantial compared with pensions of a generation ago. For most members, the practical takeaway is reassuring — master trusts are professionally run, closely regulated, and generally offer solid, low-cost default options — but it's still worth knowing which master trust holds your money, checking your statements periodically, and keeping track of pots left behind at previous employers so nothing gets forgotten. For more on how auto-enrolment brought master trusts to prominence in the first place, see our guide on how auto-enrolment works.