Impact Investing: What It Is and How to Get Started
Impact Investing: What It Is and How to Get Started
Last updated: 24 June 2026 | Author: VerdaScope Editorial Team
Impact investing targets measurable positive social or environmental outcomes alongside financial return. Unlike broad ESG investing, which often emphasises risk management and portfolio integration, impact investing requires intentional outcome design—who benefits, what changes, and how success is measured. In the UK, impact investment spans social housing funds, community energy, outcomes-based contracts, and venture capital for mission-led businesses.
This guide explains what is impact investing, how social impact investing works in UK markets, and how ESG vs impact investing differs in practice. It includes UK ecosystem examples such as Better Society Capital (formerly Big Society Capital) and the Social Investment Business. This is general information, not financial advice. For the wider investing landscape, see ESG investing guide.
Direct Answer
Impact investing is investing made with the intention to generate positive, measurable social or environmental impact alongside a financial return. Impact investors typically define a theory of change, select metrics and baselines, and report outcomes—not only process or ESG scores. In the UK, the social impact investment market has grown substantially over the past decade, with institutions including Better Society Capital helping to channel capital toward housing, economic opportunity, health, and climate-related projects. Impact investing can sit in private debt, equity, funds, or blended finance structures—but “impact” claims require evidence to avoid greenwashing.
Key Takeaways
- Impact investing requires intentionality, measurement, and typically additionality thinking—would this outcome have happened without the investment?
- ESG vs impact investing: ESG often screens or integrates factors in mainstream portfolios; impact prioritises defined outcomes (e.g. homes delivered, emissions avoided, jobs created).
- UK impact investment includes social enterprises, charities trading subsidiaries, community organisations, and some mainstream funds with explicit impact mandates.
- Better Society Capital (formerly Big Society Capital) is a UK institution focused on growing social impact investment; market data it publishes indicates a multi-billion-pound UK market.
- Social Investment Business provides loans and investment to charities and social enterprises in England—an example of dedicated social impact investing infrastructure.
- FCA SDR rules include a Sustainability Impact label for certain retail funds—criteria differ from generic “impact” marketing.
- Start with objectives, asset class fit, measurement capacity, and governance—then compare structures via green finance and ESG investing.
What Is Impact Investing?
What is impact investing? The Global Impact Investing Network (GIIN) defines impact investments as investments made with the intention to generate positive, measurable social and environmental impact alongside a financial return. Core elements usually include:
- Intentionality — impact is a primary objective, not a side effect of ESG screening.
- Measurement — metrics, baselines, and reporting cycles are specified.
- Financial return — impact investing is not the same as philanthropy; investors typically expect return of capital and, in many cases, market-rate or near-market returns (though some accept below-market returns for higher impact).
- Range of asset classes — private equity, private debt, public equities (with impact mandate), real assets, and guarantees.
Impact investing is sometimes grouped under sustainable investing or responsible investing, but the operational test is outcome evidence—not label language.
Impact investing in three sentences
Impact investors choose enterprises or projects where capital can drive specific social or environmental results. They define how those results will be measured and reported over time. Financial return expectations are set explicitly—from concessionary (below market) to market rate—depending on mission and risk.
ESG vs Impact Investing
Understanding ESG vs impact investing prevents category errors—especially where marketing uses both terms interchangeably.
| Dimension | ESG investing | Impact investing |
|---|---|---|
| Primary driver | Risk, integration, values alignment, or relative ESG performance | Measurable positive outcomes |
| Portfolio construction | Often benchmark-relative; may hold broad market exposure | Often thematic or mission-constrained |
| Measurement | ESG scores, controversy flags, carbon metrics | Outcome KPIs tied to theory of change |
| Typical investor | Pension funds, retail ESG funds, asset managers | Foundations, DFIs, family offices, social funds, some institutional mandates |
| UK regulation lens | FCA SDR labels (Focus, Improvers, Impact, Mixed Goals) | SDR Sustainability Impact label where retail fund criteria met; plus general anti-greenwashing |
ESG integration might hold a large diversified portfolio with better average governance scores. Impact investing might finance affordable housing units with a target count of homes delivered and tenants supported—reported annually.
For fund-level distinctions and due diligence, see impact investing vs ESG in the pillar guide and ESG greenwashing.
Social Impact Investing in the UK
Social impact investing addresses issues such as homelessness, financial inclusion, youth employment, community health, and affordable housing. UK characteristics include:
Legal forms and investees
- Social enterprises and Community Interest Companies (CICs)
- Charities with trading subsidiaries
- Purpose-led SMEs with embedded mission
- Housing associations and affordable housing developers
- Local authority-linked projects (where investment structures permit)
Investment instruments
| Instrument | Role in social impact investing |
|---|---|
| Social impact bonds / outcomes contracts | Payment linked to verified social outcomes (e.g. reduced reoffending) |
| Social loans | Debt to charities and social enterprises with mission-aligned covenants |
| Social property funds | Real assets delivering affordable or supported housing |
| Venture / growth equity | Scaling mission-led businesses |
| Blended finance | Public or philanthropic capital de-risking private investment |
UK market context
Better Society Capital (BSC), which evolved from Big Society Capital, publishes market analysis on UK social impact investment. BSC reports that the value of the social impact investment market reached approximately £11.2 billion at end of 2024, with continued growth in commitments. Treat market statistics as point-in-time estimates—verify latest figures on bettersocietycapital.com.
BSC focuses on areas including housing, economic opportunity, climate and energy, and health—illustrating how impact investment UK spans environmental and social themes.
UK Examples: Better Society Capital and Social Investment Business
Better Society Capital (formerly Big Society Capital)
Big Society Capital was established to grow the UK social investment market, channeling capital from dormant accounts and institutional partners. The organisation now operates as Better Society Capital, continuing to partner with government, fund managers, and investors to expand social impact investing.
Practical relevance for readers:
- Institutional investors may co-invest in funds backed by or aligned with BSC’s market-building role.
- Social enterprises may access capital through fund managers in BSC’s ecosystem.
- Businesses partnering on outcomes-based programmes may encounter structures influenced by UK social investment policy.
BSC does not replace due diligence on individual funds—investors should assess each product’s terms, impact methodology, and fees.
Social Investment Business
The Social Investment Business (SIB) is a UK social lender and investor providing finance to charities and social enterprises—particularly in England. It offers loans and investment designed for organisations that may struggle to access conventional bank finance because of structure (e.g. charity status) or risk profile.
SIB illustrates how impact investment UK infrastructure includes specialist intermediaries—not only mainstream asset managers with ESG overlays.
Organisation names, mandates, and product availability change. Verify current offerings on official websites before acting.
Impact Investing Examples (Illustrative Categories)
Impact investing examples often cited in UK and international markets include:
| Sector | Example impact thesis | Illustrative metrics |
|---|---|---|
| Affordable housing | Increase supply of below-market rental homes | Units delivered, affordability tenure, tenant support |
| Community energy | Local renewable generation benefiting communities | kWh generated, community ownership share, bill savings |
| Financial inclusion | Credit and savings for underserved households | Accounts opened, default rates, financial resilience indicators |
| Employment | Support disadvantaged groups into sustained work | Job placements, 12-month retention rates |
| Health and social care | Preventative services reducing acute demand | Outcomes per contract, cost avoidance (where verified) |
| Climate | Measurable emissions reduction in real economy | Tonnes CO₂e avoided, energy efficiency upgrades completed |
These are categories, not endorsements of specific deals. Each investment requires its own legal, financial, and impact assessment.
Who Should Consider Impact Investing?
Institutional asset owners
Pensions, insurers, and endowments may allocate a mission-aligned sleeve where fiduciary duty permits. Trustees should document how impact fits investment beliefs and how outcomes are verified.
Foundations and family offices
Often accept blended return expectations—using grants and concessionary capital alongside impact investments.
Corporates
Some businesses deploy corporate venture or community investment aligned with ESG strategy and materiality—avoid conflating CSR donations with impact investments unless measurement is equivalent.
High-net-worth and retail investors
Access is typically via impact funds, community shares, or platforms offering certified social investments. Retail funds may use FCA Sustainability Impact labels where criteria are met—read consumer disclosures carefully.
Social enterprises seeking capital
Prepare impact metrics, governance, and financial models investors expect. Alignment with ESG reporting and sustainability KPIs can support credibility.
How to Get Started: A UK-Focused Checklist
Educational workflow—not investment advice.
Step 1: Clarify objectives
- Which outcomes matter (housing, climate, health, inclusion)?
- Is financial return primary, balanced, or concessionary?
- What time horizon and liquidity do you need?
Step 2: Choose your role
- Investor — selecting funds or direct deals
- Investee — raising impact capital
- Corporate partner — commissioning outcomes or co-investing
Step 3: Define measurement before capital
- Select metrics with baselines and reporting frequency
- Assign impact verification (internal, third party, or outcomes auditor)
- Document limitations and unintended consequences
Step 4: Select structure
| If you need… | Consider… |
|---|---|
| Charity/social enterprise growth loan | Specialist social lenders (e.g. SIB-type providers) |
| Diversified impact exposure | Impact fund or labelled retail fund (verify FCA SDR disclosures) |
| Project-specific environmental capex | Green loans or green bonds |
| Public service outcomes | Outcomes contracts / social impact bonds (government or local commissioning) |
Step 5: Governance and risk
- Conduct financial, legal, and impact due diligence
- Align claims with UK Green Claims Code and FCA rules where communications are regulated
- Avoid overstating additionality or attribution
Step 6: Report and learn
- Publish impact reports alongside financial results
- Revise metrics if they drive perverse incentives
- Compare outcomes to theory of change—not only outputs
Regulation, Labels, and Greenwashing Risk
Impact language attracts scrutiny. In UK retail markets:
- The FCA anti-greenwashing rule (SDR) applies to sustainability references by authorised firms broadly.
- The Sustainability Impact label has specific criteria for qualifying funds—generic “impact” fund names without meeting criteria face disclosure requirements.
Corporate and fund impact claims should be:
- Specific — what outcome, for whom, by when
- Substantiated — data sources and assurance where material
- Balanced — limitations and risks stated
See greenwashing in ESG investing for fund due diligence prompts.
Compliant vs Risky Impact Claims
| Risky | More defensible |
|---|---|
| “Impact fund” with no outcome metrics | Defined KPIs, baselines, and annual impact report |
| Counting outputs only (training sessions held) | Outcome metrics (sustained employment, emissions reduced) |
| Implying government endorsement without contract detail | Clear description of outcomes contract and payment triggers |
| Marketing photos without data | Impact report aligned with financial report timelines |
Common Mistakes
- Using “impact” interchangeably with ESG — integration is not impact without outcome design.
- Choosing metrics that are easy but meaningless — activity counts without outcomes.
- Ignoring additionality — claiming impact for changes that would occur anyway.
- Underinvesting in impact reporting systems — investors lose confidence quickly.
- Retail investors relying on fund names — read SDR disclosures and holdings.
- Social enterprises raising capital without governance readiness — weak boards and reporting limit follow-on funding.
Frequently Asked Questions
What is impact investing?
Investing with the intention to generate positive, measurable social or environmental impact alongside financial return. Measurement and intentionality distinguish it from generic ESG integration.
What is impact investment UK market size?
Better Society Capital reported approximately £11.2 billion market value at end of 2024. Market definitions vary—use latest published research rather than assuming precise comparability across studies.
What is social impact investing?
Investing focused on social outcomes—such as affordable housing, employment, health, and inclusion—often through social enterprises, outcomes contracts, and specialist funds.
What is the difference between ESG vs impact investing?
ESG investing typically integrates environmental, social, and governance factors into mainstream portfolio management. Impact investing prioritises defined, measurable outcomes as a core objective.
What are impact investing examples in the UK?
Examples include affordable housing funds, community energy projects, social enterprise loans, outcomes-based public service contracts, and climate retrofit programmes with measured emissions reductions.
Who is Better Society Capital?
Better Society Capital (formerly Big Society Capital) is a UK institution focused on growing social impact investment across themes including housing, economic opportunity, climate and energy, and health.
What is Social Investment Business?
Social Investment Business is a UK organisation providing loans and investment to charities and social enterprises, particularly in England—an example of dedicated social finance infrastructure.
Can impact investing achieve market-rate returns?
Some impact investments target market-rate returns; others accept below-market returns for higher impact or higher risk. Return expectations depend on sector, structure, and risk—there is no single impact return profile.
How does FCA SDR relate to impact investing?
SDR includes a Sustainability Impact label for certain retail funds meeting FCA criteria, plus anti-greenwashing requirements for sustainability references. Verify current rules on fca.org.uk.
Is this financial advice?
No. This guide is educational. Seek regulated advice for personal investment decisions.
Sources and Update Log
| Date | Update |
|---|---|
| 24 June 2026 | Initial publication: UK impact investing guide with BSC and SIB context |
Authoritative sources
- Financial Conduct Authority, Policy Statement PS23/16 (SDR and investment labels), November 2023 — fca.org.uk
- HM Treasury, Greening Finance: A Roadmap to Sustainable Investing, October 2021 — gov.uk
- Better Society Capital market publications — bettersocietycapital.com
- Social Investment Business — official organisation website (verify current legal name and offerings)
Next Steps
- Broader investing hub → ESG investing guide
- Business funding options → Green finance guide
- Use-of-proceeds debt → Green bonds guide
- Fund claim checks → Greenwashing in ESG investing
- Corporate ESG context → What is ESG