What is a master trust pension?

A master trust pension is a type of occupational pension scheme, one where several unrelated employers share one trust and one board of trustees, rather than each running their own.

Before automatic enrolment, occupational schemes with their own trustee board were mostly the preserve of large companies, since only they could justify the governance cost. That landscape has changed, since NEST, established in 2010 and now one of the largest automatic enrolment schemes in the UK, became the default route for most employers, and standalone single employer schemes have become far less common.

What is a master trust pension

A master trust pension pools many employers under a single trust. One independent trustee board runs the whole thing in members' interests, manages the investment strategy, and sets the default fund.

Each employer simply enrols staff and pays contributions. There is no governance burden, no trustee meetings, and no scheme specific paperwork.

Master trust versus a single employer occupational scheme

Both are occupational pension schemes, since both are trust based. The difference is who the trust serves.

A single employer scheme has its own trustees and its own rules, built for one workforce. A master trust pension shares its trustees and rules across many employers, which spreads the cost of governance across a far larger membership.

Occupational scheme versus a group personal pension scheme

An occupational scheme, whether single employer or master trust, is trust based. A group personal pension scheme, or GPP, is not.

With a GPP, the employer selects one provider and each employee holds an individual contract directly with that provider. There are no trustees, no trust, and the governance sits with the provider's own committee rather than an independent board chosen for the scheme.

So the real hierarchy splits occupational schemes into single employer and master trust, both trust based. GPPs sit outside that entirely as a contract based alternative.

Why small companies moved to a master trust pension

Regulatory data shows this shift clearly. Between 2011 and 2025, the number of occupational DC pension schemes fell by 78%, from 3,660 to 790, with the sharpest declines among schemes holding under 5,000 members.

Small schemes with 12 to 999 members fell by an average of 14% a year since 2020. The Pensions Regulator found that many of these small schemes had weak governance, with only 17% carrying out the required value for members assessment in 2023.

Most of these small companies moved specifically to NEST, since it is the largest master trust pension and the default option under automatic enrolment. So this shift is really a move to NEST, not just to master trusts in general.

NEST and the rise of the master trust pension

NEST is the largest master trust pension in the UK and the largest automatic enrolment scheme overall, with over 11 million members and 30 billion pounds under management. It was set up with a public service obligation to accept any employer, including those with lower paid or short term staff that other providers might turn away.

By 2025, 92% of all DC scheme members sat inside a master trust pension, a total of 30.1 million people.

Is the window closed for setting up a new scheme

For a standalone single employer occupational scheme, yes, largely. A large single employer scheme can still compete on service and member engagement, but that only really works at significant scale.

For a small or medium employer starting from scratch today, the real choice sits between a master trust pension and a GPP, not between those and building a bespoke trust. The regulator's own direction of travel, pushing consolidation and value for money assessments, makes a new small occupational trust an increasingly hard case to justify.

Is a master trust pension right for your business

If you are running your own occupational scheme with fewer than a few thousand members, it is worth checking whether a master trust pension would now serve your staff better. The regulator's own data suggests the answer is increasingly yes.

Speak to a regulated financial advisor before making any changes, since moving schemes affects existing member benefits and needs to be handled properly.