Impact Investing for Charitable Foundations

Charitable foundations sit at an intersection where financial resources and social purpose converge. Traditionally, foundations separated these two dimensions: investment assets were managed to maximise financial returns, and grant expenditure delivered social impact. Increasingly, philanthropically minded families and institutional foundations are questioning this separation — using the investment portfolio itself to pursue social objectives alongside, or as part of, their charitable mission. This guide explains the key tools available to foundations wishing to pursue impact investing, the governance considerations, and how impact is measured.

The Case for Impact Investing in Foundations

A UK charitable foundation with an endowment of £10m might make £400,000–£500,000 in grants per year (a typical 4–5% spending rate), while the remaining £9.5m sits in a conventionally managed investment portfolio. Critics of this model observe that a foundation focused on, say, affordable housing or renewable energy is unlikely to be furthering its mission by investing the endowment in fossil fuel producers or landlords charging market rents.

Impact investing asks whether the endowment — not just the grants — can be deployed in ways consistent with the foundation's mission. Done well, this approach aligns the whole balance sheet with the charitable purpose. Done poorly, it can compromise financial sustainability and expose trustees to breach of trust risk.

The Charity Commission's updated guidance makes clear that trustees may take account of social, ethical, and environmental considerations in investment decisions where there is no significant financial detriment and the approach does not conflict with the charity's purposes. This provides the legal basis for impact-oriented approaches.

Programme-Related Investments (PRIs)

Programme-related investments are investments made by a charity primarily to further its charitable purposes rather than to generate investment return. Examples include:

• A housing foundation lending at below-market rates to a housing association to develop affordable homes.
• An education foundation providing a low-interest loan to a social enterprise delivering educational services.
• A health foundation investing equity in a community health business.

PRIs are characterised by the primary purpose (advancing charitable objects) and the acceptance of below-market financial terms in exchange for social impact. Any financial return is a secondary benefit. The key legal point is that PRIs are treated as mission expenditure (like grants), not as investments for accounting purposes. Trustees must satisfy themselves that the primary purpose is genuinely charitable.

PRIs give foundations the ability to deploy capital as "patient capital" in situations where commercial lenders would not engage — early-stage social enterprises, charitable trading subsidiaries, or community assets that generate limited financial returns.

The Charity Commission's guidance (CC14) and accompanying legal advice from specialist charity solicitors is essential before structuring any PRI.

Mission-Related Investments (MRIs)

Mission-related investments are investments that both advance the foundation's charitable mission and generate a financial return. Unlike PRIs, the financial return is expected to be market-rate (or close to it) — the distinction is that the investment is in activities or entities whose purpose is aligned with the foundation's mission.

Examples include:

• A climate foundation investing in a listed green infrastructure fund.
• An arts foundation investing in a social impact bond linked to arts education outcomes.
• A health foundation investing in affordable healthcare REITs.

MRIs sit within the conventional investment portfolio but are selected with an eye to mission alignment as well as financial return. They are a more familiar form of ESG or sustainable investing applied to the mission context.

For trustees uncertain about whether an investment qualifies as an MRI or PRI, the practical test is whether the primary driver is financial return (MRI — investment decision) or charitable purpose (PRI — expenditure decision). Both are legitimate but involve different governance processes and accounting treatments.

Blended Finance Structures

Blended finance refers to the combination of concessionary (below-market) capital from philanthropic or public sources with market-rate commercial capital, to finance activities that would not be viable on purely commercial terms. The concessionary capital ("first-loss capital" or "catalytic capital") absorbs downside risk, improving the risk-adjusted return for commercial investors and thereby "blending" the two sources.

For charitable foundations, blended finance creates the possibility of deploying relatively small amounts of philanthropic capital to mobilise much larger volumes of commercial investment. A foundation that provides first-loss capital for an affordable housing fund, for example, might enable the fund to attract 5–10× as much commercial debt and equity.

Blended finance instruments include:

• Subordinated debt: the foundation takes the most junior (highest risk) tranche, enabling senior commercial lenders to participate on preferred terms.
• Guarantees: the foundation provides a guarantee (contingent liability rather than deployed capital) to support commercial lending.
• Equity co-investment: the foundation invests alongside commercial investors, accepting lower return expectations.
• Revenue guarantees and pay-for-outcome models (Social Impact Bonds): the foundation provides payment on achievement of specified outcomes, reducing revenue risk for the social enterprise.

Blended finance requires specialist legal and financial structuring advice. Trustees must ensure the structure falls within the charity's investment powers and that any concessionary element is appropriate as a PRI or grant.

Social Enterprise Financing

Social enterprises — businesses with a social, environmental, or community purpose — are an important vehicle for impact investing but are often underserved by mainstream capital markets. UK social enterprises can access various financing mechanisms:

• Social investment tax relief (SITR): A tax relief for individuals investing in qualifying social enterprises (though SITR was not renewed after its April 2023 expiry as at 2026 — investors should check current status).
• CBILS/UKSPF. Various government-backed loan and grant schemes have supported social enterprises, though availability and terms change frequently.
• Specialist impact lenders: Big Society Capital, Social Investment Business, Resonance, and Triodos Bank are among the UK's specialist social finance providers, alongside community development finance institutions (CDFIs).
• Crowdfunding. Platforms such as Crowdfunder and Ethex enable community investment into social enterprises.

For foundations financing social enterprises directly, proper due diligence — commercial, legal, and impact-related — is as important as for any commercial investment. Social purpose does not reduce the need for financial discipline.

Measuring Impact

One of the persistent criticisms of impact investing is the absence of standardised, reliable impact measurement. Without credible measurement, it is impossible to distinguish genuine impact from "impact washing" — the use of impact language to describe investments with negligible real-world social benefits.

Key frameworks and standards for impact measurement include:

Impact Management Project (IMP) norms: a framework that categorises investments by their impact characteristics — who is affected, what changes, how much change, contribution to change, and risk — providing a structured basis for impact assessment.

IRIS+ (Impact Reporting and Investment Standards): a catalogue of generally accepted performance metrics developed by the Global Impact Investing Network (GIIN), covering themes from financial inclusion to clean water.

Social Return on Investment (SROI): a monetised assessment of social value created relative to inputs, useful for communicating impact to non-specialist audiences.

Theory of Change: a narrative and evidential account of how the intervention leads to the intended social outcome, identifying assumptions and intermediary steps.

Foundations should require impact reporting from investees and grantees as a condition of investment, and they should be realistic about what can be measured and what must rely on proxy indicators and qualitative evidence.

Portfolio Examples

UK charitable foundations have been pioneers of impact investing in the UK:

• Joseph Rowntree Foundation has, since 2015, allocated a portion of its endowment to social investment (a target of around 5%) alongside its grant programme.
• Comic Relief runs a dedicated social investment vehicle ("Red Shed"), using repayable finance to support social organisations so that capital can be recycled into further investment.
• Wellcome Trust, one of the world's largest health research foundations, applies mission considerations to a portion of its investment portfolio alongside its primary scientific grant programme.
• The National Lottery Community Fund (formerly the Big Lottery Fund) has supported social impact bonds and social outcomes contracts, including through its Commissioning Better Outcomes programme.

These examples involve large endowments and dedicated impact investment teams. Smaller foundations can participate through pooled impact funds, which aggregate smaller investments to achieve the diversification and deal-flow required for a sustainable impact portfolio.

Governance Considerations for Foundation Trustees

Before pursuing impact investing, foundation trustees should:

1. Review the charity's governing document to confirm that impact investing is within the scope of the investment powers.
2. Obtain legal advice from a charity law specialist.
3. Draft or update the investment policy statement to include impact objectives, permitted instruments, risk parameters, and measurement requirements.
4. Ensure the investment committee has appropriate expertise — or access to specialist advisers — in social finance.
5. Establish clear reporting requirements for impact as well as financial return.
6. Maintain proper records of decision-making and trustee deliberations for accountability purposes.

How Global Investments Can Help

Global Investments works with charitable foundations and philanthropic families to integrate impact considerations into investment strategy, identify suitable impact investment opportunities, and develop impact measurement frameworks. We introduce specialist social finance advisers and can assist with investment policy statement drafting and trustee education. Contact us to discuss how your foundation's endowment can be put to work in alignment with your charitable mission.

This guide is for information purposes only and does not constitute investment, legal, or charitable advice. Impact investing carries financial and non-financial risks. Trustees must exercise their duties carefully and take independent professional advice before implementing any impact investment strategy. Rules and programmes cited are as at June 2026 and are subject to change.