A bulk annuity is an insurance contract that transfers the risk of paying defined benefit pensions from a scheme to an insurer. In a buy-in the scheme holds the policy as an asset; in a buyout the insurer takes full responsibility for paying members directly. It is the dominant endgame for UK DB pension schemes.
A bulk annuity is the financial instrument at the centre of one of the most important structural shifts in institutional investing: the transfer of trillions in defined benefit pension liabilities from corporate sponsors to insurers. For UK pension schemes in particular, it has become the standard "endgame" — the way a closed pension plan finally hands off its obligations and winds down. Understanding it is essential for anyone tracking where pension capital is flowing.
What is a bulk annuity?
A bulk annuity is an insurance contract that covers the pension liabilities of an entire scheme (or a defined block of members) in a single transaction. The pension scheme pays an insurer a premium; in return, the insurer takes on the responsibility for paying the promised retirement benefits.
The transaction transfers three risks that the pension scheme and its corporate sponsor would otherwise carry indefinitely:
- Investment risk — the chance that assets underperform the cost of paying pensions.
- Longevity risk — the chance that members live longer than expected, costing more.
- Inflation risk — the chance that index-linked benefits rise faster than assumed.
Once those risks sit with a regulated insurer, the sponsoring company can remove a large, volatile liability from its balance sheet — which is precisely why finance directors have pursued these deals so aggressively.
Buy-in vs buyout: the key distinction
The two main forms of bulk annuity differ in who ends up responsible for members.
Buy-in. The scheme buys the annuity as an investment asset and keeps it on its own balance sheet. The trustees continue to administer and pay members, and the insurer reimburses the scheme for those payments. A buy-in is effectively a hedge: the scheme has matched its liabilities with an insurance asset but has not yet exited.
Buyout. The insurer takes over the liabilities completely and becomes directly responsible for paying members, who become the insurer's policyholders. After a buyout, the pension scheme has discharged its obligations and can usually wind up entirely.
In practice many schemes follow a path from buy-in to buyout: they lock in pricing with a buy-in when funding allows, then convert to a full buyout once they are ready to wind the scheme down. The buy-in removes the risk; the buyout removes the scheme.
Why the bulk annuity market is booming
The surge in bulk annuity activity is, above all, a story about interest rates. When rates rose sharply from 2022 onward, the present value of pension liabilities fell — and many UK defined benefit schemes that had been in deficit for years suddenly found themselves fully funded or in surplus. For the first time, the cost of insuring their liabilities through a buyout was within reach.
That created a wave of demand. Sponsors that had spent a decade topping up pension deficits could finally offload the risk for good, and trustees could secure members' benefits with a regulated insurer. The result is a pipeline of transactions that has reshaped the UK pensions landscape and turned bulk annuities into the consensus endgame for closed DB schemes.
How big is the UK bulk annuity market?
The numbers are striking. Forecasters expect UK buy-in and buyout volumes of roughly £40-55 billion in 2026, with adviser LCP suggesting a record near the top of that range. Looking at the broader pension-insurance market — adding longevity swaps to bulk annuities — WTW has pointed to a market approaching £70 billion in 2026, of which around £50 billion would be bulk annuities and £20 billion longevity insurance.
The cumulative scale is larger still: more than half a trillion pounds of pension-insurance transactions have now been completed, while over £1 trillion of liabilities remains within private-sector UK defined benefit schemes still to be addressed. In other words, the market is enormous and the runway is long.
The risks and open questions
For all its momentum, the bulk annuity market carries real concerns that allocators and regulators watch closely.
Concentration. A relatively small number of insurers write the bulk of UK volume. That raises questions about counterparty strength and about whether the market has the capacity to absorb the multi-hundred-billion-pound pipeline without straining pricing or underwriting discipline. New entrants and consolidators have appeared partly to meet that demand.
Member protection. Once a buyout completes, members depend on the insurer's solvency rather than the scheme and its sponsor. UK regulation and the Financial Services Compensation Scheme provide a backstop, but the shift moves millions of retirees' security onto insurance balance sheets.
Asset implications. Insurers fund these annuities by investing the premiums, often in long-dated credit, infrastructure debt and other illiquid assets. As pension money flows into insurers, it changes who owns large swathes of long-term fixed-income and real-asset markets — a quiet but significant reallocation within the institutional system.
Why this matters for allocators
Bulk annuities are not just a UK pensions technicality; they are a multi-hundred-billion-pound transfer of capital from pension schemes to insurers, and the largest single driver of demand for long-dated credit and matching assets in the UK. For asset managers, the insurers absorbing these liabilities are now among the most important buyers of long-duration assets. For pension and sovereign investors globally, the UK experience is a template for how mature defined benefit systems eventually de-risk — a path that the United States, the Netherlands and others are watching.
In plain English
A bulk annuity is when a pension scheme pays an insurance company to take over its pension promises. In a buy-in the scheme keeps paying members but is reimbursed; in a buyout the insurer takes over completely and the scheme closes. Higher interest rates made these deals affordable, and UK schemes are now insuring tens of billions of pounds of pensions a year — heading toward a record in 2026.
Sources and further reading
- LCP — forecast of record UK buy-in volumes up to £55 billion in 2026.
- WTW (Pensions Expert) — projection of a pension-insurance market approaching £70 billion in 2026, including ~£20 billion of longevity swaps.
- IPE — "Buyout boom cements insurance as top endgame for UK DB pension funds."
- XPS Group — Bulk annuity market January 2026 update; cumulative transactions over £500 billion with over £1 trillion of DB liabilities remaining.