Green bonds UK: gilts, funds and corporate bonds explained
Green bonds in the UK include government green gilts, corporate green bonds and green bond funds.
Financial information only
This article is for informational and educational purposes only. It is not financial advice, investment advice, tax advice, a recommendation, or a personal financial promotion. Bonds can fall in value and investors may lose money. Speak to a financial adviser authorised by the FCA (Financial Conduct Authority) before making investment decisions.
Green bonds in the UK include government green gilts, corporate green bonds and green bond funds. They can make the use of proceeds clearer, but they do not remove credit risk, interest-rate risk, inflation risk or greenwashing risk.
For related guidance, read our explainers on what green bonds are, green gilts, green bonds vs ESG funds and whether green bonds are a good investment.
The short answer
A green bond is a debt instrument where the issuer commits to using the proceeds for eligible environmental projects. In the UK, investors may come across green gilts issued by the UK Government, corporate green bonds issued by companies, green bonds inside bond funds, and global green bond funds available through investment platforms.
The green label describes how proceeds are intended to be allocated. It does not make the bond safe, suitable or profitable. The financial return still depends on the issuer, coupon, maturity, credit quality, market yields, inflation and the price paid.
Types of green bond UK investors may see
| Type | What it is | Main risk |
|---|---|---|
| Green gilt | A UK Government bond where proceeds are allocated to eligible green expenditure. | Interest-rate and inflation risk, plus normal gilt price volatility. |
| Corporate green bond | A company bond linked to eligible green projects. | Issuer credit risk and the quality of the green bond framework. |
| Green bond fund | A fund holding a portfolio of green bonds from different issuers. | Fund fees, duration risk, credit mix and portfolio transparency. |
| Mixed sustainable bond fund | A bond fund that may hold green, social, sustainability or ordinary bonds. | Unclear allocation if the sustainability claim is broad. |
Green gilts vs corporate green bonds
Green gilts are issued by the UK Government through the Debt Management Office. They are part of the Government's green financing programme and are linked to eligible green expenditures such as clean transport, renewable energy, energy efficiency, pollution prevention and climate adaptation, depending on the framework and reporting.
Corporate green bonds are issued by companies. Their risk profile depends heavily on the issuer. A green bond from a financially strong regulated utility is not the same as a green bond from a highly leveraged company. The green framework matters, but credit quality still matters first.
How green bond frameworks work
Most credible green bonds are structured around a green bond framework. The framework should explain eligible project categories, how projects are selected, how proceeds are managed and what reporting the issuer will provide. The ICMA (International Capital Market Association) Green Bond Principles are the main voluntary market reference point.
Investors should look for an external review, often called a second-party opinion. This does not guarantee the bond will perform well, but it can help assess whether the framework aligns with recognised market principles.
How UK investors can access green bonds
Retail investors usually access green bonds through funds, ETFs (exchange-traded funds) or investment platforms rather than building a direct bond portfolio. Direct bond investing can involve large minimum sizes, liquidity issues, dealing spreads and a need to understand duration and credit risk. Funds can improve diversification, but they add fees and may hold bonds with different maturities, currencies and credit ratings.
Some investors may hold green bond funds inside a stocks and shares ISA (individual savings account) or SIPP (self-invested personal pension), subject to platform availability. The wrapper affects tax treatment. It does not change the risk of the underlying bonds.
What to check on a green bond fund factsheet
A green bond fund should be assessed as both an investment product and a sustainability product. The factsheet should make the financial exposure clear before the investor gets to the green claim. If the fund has a high average duration, a low credit-quality mix, unhedged overseas currency exposure or a high ongoing charge, those features can dominate the investor experience even when the underlying bonds are credible.
| Factsheet item | Why it matters | What to compare |
|---|---|---|
| Average duration | Shows sensitivity to changes in market interest rates. | Short, intermediate and long-duration bond funds can behave very differently. |
| Credit rating mix | Indicates how much issuer default risk the portfolio is taking. | Compare government, investment-grade corporate and high-yield exposure. |
| Currency exposure | Global green bond funds can hold euro, dollar and other currency bonds. | Check whether the share class is hedged to GBP (pounds sterling). |
| Use-of-proceeds share | Shows whether the fund is mainly green bonds or a wider bond strategy. | Look for the percentage in labelled green bonds, social bonds, sustainability bonds and ordinary bonds. |
| OCF (ongoing charges figure) | Fees reduce returns every year. | Compare with ordinary bond funds and passive green bond ETFs. |
This is where our sustainable fund factsheet checklist is useful. Green bond funds often look clean at headline level, but the detail decides whether they fit the investor's risk tolerance.
Yield, price and the greenium
Green bonds can sometimes trade at a slightly lower yield than similar conventional bonds if demand for green-labelled exposure is strong. This is often called a greenium. For issuers, that can reduce funding costs. For investors, it may mean accepting a slightly lower yield for the same issuer and maturity.
The greenium is not guaranteed. It varies by issuer, maturity, market conditions, supply, demand and investor mandate pressure. Investors should compare a green bond with a similar conventional bond from the same or similar issuer before assuming the green label improves returns.
Greenwashing risk
Greenwashing in green bonds usually sits in the project framework rather than the bond mechanics. Watch for broad project categories, weak reporting, limited allocation detail, no external review, or issuers whose overall business strategy conflicts with the claimed environmental benefit.
- Does the framework clearly define eligible projects?
- Is there an external review or second-party opinion?
- Does the issuer publish allocation reporting?
- Does the issuer publish impact reporting, not only spending categories?
- Are refinancing periods and look-back periods clear?
- Is the issuer using green bonds to finance marginal improvements while expanding high-emission activity elsewhere?
Green bonds vs green savings
Green bonds are investments. They can fall in price. Green savings products are deposit-style products, subject to product terms and eligibility for deposit protection where applicable. A green savings bond from NS&I (National Savings and Investments), where available, should not be confused with a tradable bond fund or corporate green bond.
For that distinction, read green savings bonds vs green bonds.
Where green bonds fit inside the wider invest section
Green bonds are one part of the invest category, not a replacement for a portfolio plan. A reader comparing sustainable funds may use green bonds for fixed-income exposure, sustainable equity funds for company ownership, cash ISAs (individual savings accounts) for short-term savings and pensions for long-term retirement planning. Those products answer different questions.
If the question is "what does this product finance?", green bonds are useful because the issuer should publish use-of-proceeds reporting. If the question is "will this preserve cash for a short-term goal?", a green bond fund may be the wrong tool. If the question is "how do I avoid fossil fuel exposure across my whole portfolio?", a green bond allocation alone is not enough.
Green infrastructure also depends on non-financial institutions such as The Crown Estate, which grants seabed rights for offshore wind in England, Wales and Northern Ireland. Our guide to The Crown Estate explains why public land and seabed management can affect the pipeline behind renewable-energy finance.
Useful source links
- ICMA Green Bond Principles
- UK Debt Management Office green gilts
- UK Government green financing framework and reporting
- Green gilts UK
- What are green bonds?
Bottom line
Green bonds can make project allocation more transparent than ordinary bonds, but they remain bonds. Check issuer risk, duration, yield, price, framework quality, external review and reporting before relying on the green label.