Private Credit Under the Microscope: A 2026 Due-Diligence Playbook for UK Analysts

Private credit has moved from a niche allocation to a mainstream component of UK institutional portfolios. For analysts, the interesting question is no longer whether the asset class can deliver an illiquidity premium. It is whether the premium is being earned through disciplined underwriting, credible valuation and robust liquidity management, or through accounting choices and structural complexity that become visible only when financing conditions tighten.

Why the stress test matters now

UK mid-market direct lending grew rapidly in an environment of bank retrenchment, low base rates and abundant institutional demand. That combination encouraged borrowers and lenders to accept documentation that might look less comfortable in a higher-rate, slower-growth world. In 2026, refinancing needs, weaker earnings in some sectors and greater scrutiny from regulators mean that the asset class is being tested rather than merely marketed.

The Bank of England and other supervisory bodies have repeatedly highlighted valuation uncertainty, leverage and liquidity mismatch across private markets. That does not make private credit unsafe. It does mean that allocators should treat manager reporting as a starting point for inquiry, not as a substitute for independent judgement.

Valuation: the first line of defence

Private credit valuations are not observed in the way listed bond prices are. They depend on fair-value policies, manager judgement, comparable transactions and, in some cases, third-party valuation agents. Analysts should ask how often positions are revalued, who sits on the valuation committee, whether independent valuations are used consistently, and how often overrides have occurred.

A useful discipline is to compare marks across managers with similar portfolios. Persistent dispersion may reflect genuine portfolio differences, but it may also indicate differing valuation cultures. Analysts should examine the treatment of payment-in-kind interest, capitalised fees, EBITDA add-backs and covenant amendments. A fund that reports strong income while relying on accrued rather than cash interest deserves closer analysis.

Fund-level facilities also warrant attention. Subscription lines and net asset value facilities can improve reported internal rates of return and smooth cash flows, but they can also obscure underlying performance and introduce contingent liquidity risk. The relevant questions are straightforward: what is the facility used for, how large is it relative to fund commitments, what covenants apply, and what happens if lenders withdraw or collateral values fall?

Covenants and documentation: read the small print

A covenant is only useful if it is monitored, tested and enforceable. Analysts should distinguish maintenance covenants from incurrence covenants, review leverage definitions and EBITDA adjustment mechanics, and assess how much headroom borrowers actually have. Equity cures and amendment provisions can materially change the risk profile of a loan after it has been originated.

Request covenant breach reports, amendment logs and the trend in headroom across the portfolio. Ask whether waivers have become more frequent, whether borrowers are switching to payment-in-kind treatment, and whether lenders are extending maturities rather than recognising weaker credit quality. These are not necessarily signs of distress, but they are signals that the portfolio is changing.

Liquidity and fund structure

Private credit funds are not homogeneous. Closed-ended vehicles may offer better alignment with illiquid assets, while evergreen or open-ended structures can create liquidity mismatch if redemption terms are more generous than the underlying loan book allows. Analysts should model cash-flow calls and distributions under stress, not just in the base case.

Investor concentration matters too. A fund with a small number of large limited partners may face pressure if one investor seeks to exit or fails to meet a capital call. Gates, lock-ups, side pockets and fund-level leverage should be understood before allocation, not after a liquidity event.

Portfolio and borrower concentration

Look through the fund to sector, sponsor and borrower exposures. Mid-market portfolios can be concentrated in software, healthcare, business services and specialist lending, each with different cyclical and rate sensitivities. Analysts should stress interest coverage and fixed-charge coverage under weaker earnings, higher refinancing costs and delayed exits.

Vintage diversification is important. A fund launched during a period of aggressive lending may carry different risks from one underwritten after spreads widened and covenants tightened. The same applies to funds that have grown quickly: rapid deployment can be a sign of strong origination, but it can also weaken underwriting discipline.

What pension schemes and insurers should monitor

For UK pension schemes, private credit can offer duration and return diversification, but trustees should test whether the illiquidity premium compensates for valuation uncertainty, governance burden and cash-flow risk. DB schemes with mature liabilities need to understand collateral calls and distribution timing. DC schemes need clear evidence that members are being compensated for illiquidity and that the default arrangement can manage liquidity without forced sales.

Insurers face a different lens. Capital treatment, liquidity planning and valuation governance are central, and the PRA’s scrutiny of private-market exposures makes documentation and reporting quality more important. Analysts advising insurers should consider whether the fund’s evidence pack supports regulatory reporting and whether the manager can provide timely, granular data.

A practical due-diligence checklist

• Review the valuation policy, committee composition, independence and override history.
• Compare marks and yields with peers, adjusting for portfolio mix and vintage.
• Examine EBITDA add-backs, payment-in-kind income, capitalised fees and amendment activity.
• Test covenant headroom and review waiver and equity-cure trends.
• Model capital calls and distributions under a stress scenario.
• Assess fund-level leverage, subscription lines and NAV facilities.
• Review investor concentration, redemption terms and gate structures.
• Look through sector, sponsor and borrower concentration.
• Stress interest coverage under weaker earnings and higher refinancing costs.
• Confirm the manager can provide granular, timely reporting for pension or insurance governance.

Conclusion

Private credit can play a legitimate role in UK institutional portfolios, but the asset class is entering a more demanding phase. The premium is not automatic. It has to be underwritten, monitored and governed. Analysts who ask precise questions about valuation, covenants and liquidity will be better placed to distinguish durable income from cosmetic stability.