Green Bond Framework: What It Contains and How to Build One
A green bond framework is the document an issuer publishes before selling a green bond. It sets out which projects the money will fund, how those projects are chosen, how the proceeds are tracked and what the issuer will report afterwards. It is voluntary, but in practice investors expect one. This guide explains what goes into it, how the EU Green Bond Standard sits alongside it, and what the work involves once the bond is sold.
Key takeaways
A green bond framework is a voluntary process document. It should cover the four ICMA Green Bond Principles components: use of proceeds, project evaluation and selection, management of proceeds, and reporting.
The European Green Bond Standard is a separate, stricter, optional label. It requires 85% of proceeds to go to EU Taxonomy-aligned activities and external review approved under EU rules.
Reporting does not end at issuance. The IMF describes a transparency burden that lasts until the bond matures, so build the data process before you build the document.
Vague use of proceeds is the quickest way to lose investor confidence. Name projects or portfolios, estimate impact, and be open about refinancing.
What a green bond framework is, and what it is not
The framework is a process document. It is not the bond prospectus, and it is not a certification. It describes how an issuer commits to managing proceeds for environmentally sound projects. According to ICMA, the Green Bond Principles are voluntary process guidelines, updated in June 2025, that recommend transparency and disclosure.
The IMF’s guidance note for sovereign debt managers says that publishing a framework showing how a planned issuance follows the ICMA Principles has become standard practice. A single framework usually covers a type of bond and can be reused for several issuances. That is why you see the same document structure from a bank, a utility, a packaging manufacturer and a national treasury.
Two points are often misunderstood:
A framework is not an assurance. It states intentions. Independent review and your own reporting show whether you kept to them.
A framework is not the EU label. You can issue a bond aligned with the ICMA Principles without ever using the European Green Bond designation.
For wider context on how green bonds relate to other labelled debt, see our mini overview of sustainability bonds.
The four core components
Every credible framework follows the structure of the Green Bond Principles. Here is what each part needs to say, and where issuers tend to be too vague.
1. Use of proceeds
This section lists the eligible green categories, such as renewable energy, energy efficiency, clean transport, sustainable water management or green buildings. For each category, set out the eligibility criteria, the environmental objective and, ideally, the indicators you will use to measure benefit.
The research we reviewed is blunt about one point: “general corporate purposes” as a use of proceeds is a red flag for investors. A credible framework maps proceeds to specific projects or portfolios and estimates impact, for example in tonnes of CO2 equivalent avoided.
Also state the split between financing new projects and refinancing existing assets. The same source notes that investors look closely at this share, and that very high refinancing ratios, above 80% in its example, can signal less added environmental benefit. You do not have to avoid refinancing. You do have to disclose it, and say what look-back period applies.
2. Process for project evaluation and selection
Here you explain who decides which projects qualify and how. Describe the environmental objectives, the criteria applied, and any exclusions. Name the internal body responsible, whether that is a green bond committee, a treasury and sustainability working group or an inter-ministerial group for sovereigns.
The KfW framework, for instance, is explicit that this is an operational matter. Issuers often need a dedicated team or working group to run project selection and annual reporting. If the committee has no named members or no meeting rhythm, readers will notice.
This is also the place to describe how you manage environmental and social risks linked to the projects, and which standards or taxonomies you refer to, such as the EU Taxonomy.
3. Management of proceeds
This section answers a simple question: where does the money sit until it is spent? Most issuers credit proceeds to a sub-account or track them within a portfolio, and describe how unallocated balances are held. State the tracking method, who verifies it, and how often balances are reviewed.
Match maturities carefully. The KfW document points out that the volume-weighted average maturity of green bonds should line up with the average duration of the underlying commitments, to avoid a mismatch. A ten-year bond financing assets that will be repaid in three years creates a gap you will need to explain.
4. Reporting
Commit to an allocation report (how much went where) and an impact report (what it achieved), and say when and where you will publish them. Typical commitments are annual updates until full allocation, then updates in the event of material changes.
The Climate Bonds Initiative has noted that the market still lacks a common reporting platform and that harmonising and centralising disclosure is the next step in its evolution. Until then, the quality of your own report is what sets you apart. We come back to this below.
The EU Green Bond Standard and your framework
Many searches on this topic are really about the EU label. The European Green Bond Standard is set out in Regulation (EU) 2023/2631. It has applied since 21 December 2024, and it is optional. Issuers who want to use the designation “European Green Bond” or “EuGB” must meet its requirements. The regulation covers financial and non-financial companies and sovereigns.
The main requirements are:
Taxonomy alignment. At least 85% of proceeds must be allocated to activities aligned with the EU Taxonomy. A flexibility pocket of 15% remains for other activities.
A factsheet before issuance. The issuer publishes a European Green Bond factsheet, reviewed by an external reviewer.
Reports after issuance. Allocation reports and an impact report follow, and the external reviewer checks them.
Registered reviewers. External reviewers must be registered with and supervised by the European Securities and Markets Authority (ESMA).
The EUR-Lex summary of the regulation gives a shorter plain-language reading of the same rules. It is worth reading before deciding whether the label suits you.
Framework or EuGB: which do you need?
They are not alternatives in the strict sense. A framework is how you describe and govern your approach. The EuGB is a regulated label with fixed rules. Some issuers will use a framework aligned with the ICMA Principles and issue without the EU label. Others will write a framework that explains how a bond meets the EuGB rules, or that accommodates both types of issuance.
Question | ICMA-aligned framework | European Green Bond (EuGB) |
Legal basis | Voluntary market guidelines | EU Regulation 2023/2631 |
Eligible projects | Issuer-defined green categories | Mainly EU Taxonomy-aligned activities (85% minimum) |
External review | Market practice, usually a second-party opinion | Required, by an ESMA-registered reviewer |
Disclosure templates | Issuer’s own format | Prescribed factsheet and reports |
Best suited to | Flexibility, activities outside the Taxonomy | Issuers with Taxonomy-aligned assets who want the EU designation |
If you issue in the UK and sell only to UK investors, the EU label is not a legal requirement. It can still matter if you plan to market to EU investors or want the strictest benchmark. Check with your legal counsel and lead manager which regime applies to your offering.
What good looks like: sovereign and corporate examples
Reading real frameworks is the fastest way to learn the format. Three are worth your time.
The UK Government. The Treasury’s Green Financing Programme raises money through green gilts, issued via the Debt Management Office, and retail Green Savings Bonds from NS&I. GOV.UK says more than £51 billion has been raised since September 2021. The framework was updated in November 2025, and the Treasury reports regularly on allocation and impact. It is a useful example of two instruments governed by one framework.
Germany. The Federal Republic’s second framework version, dated 15 January 2026, shows how a sovereign structures its introduction, issuances and updates. Notice how it separates the update process from the core criteria.
A development bank. KfW’s framework shows the operational side. It describes governance, the link between bond volumes and underlying loans, and annual reporting. It is a good template for any issuer that funds a portfolio of loans rather than a handful of assets.
Our own coverage of individual deals shows how frameworks play out in practice. See our analysis of Neste’s €700 million green bond and of Quanta’s $10 billion green bond initiative.
Step by step: building the framework
The ICMA pre-issuance checklist guides issuers through establishing a framework. The sequence below follows the same logic, adapted for a practical project plan.
Decide the objective. Are you financing new capital expenditure, refinancing, or both? Who are the target investors? This determines how strict your criteria need to be.
Inventory the eligible assets. List candidate projects and check them against your proposed categories. If the pipeline is thin, the framework will promise more than you can deliver.
Choose your reference standards. The ICMA Principles are the usual baseline. Decide whether you will also map to the EU Taxonomy or aim for the EuGB.
Set up governance. Name the committee, its members, its decision rules and its meeting schedule. Write down who signs off allocation.
Design tracking and reporting. Decide which systems hold project data, who owns each indicator, and how you will estimate impact. Do this before you draft the document.
Draft the framework. Write it around the four components, using specific criteria rather than aspirations.
Obtain external review. Most issuers seek a second-party opinion on the framework before issuing.
Publish and issue. Put the framework and the review on your investor relations page, and refer to both in the bond documentation.
Report and update. Publish allocation and impact reports on schedule, and revise the framework when your categories, standards or regulation change.
Second-party opinions: cost, timing and limits
The external review is the most visible direct cost. The IMF paper behind our research puts second-party opinion fees at around $30,000 for a standard green bond and $35,000 for a sustainability-linked bond. Fees depend on negotiation and on how complex the issuer is. They are often fixed, so they matter less as the bond gets larger.
Timing varies more than most people expect. The same paper reports one provider’s median of about two weeks, while sovereign issuers can face eight to twelve weeks because of government complexity and coordination between agencies. It also notes that engagement with providers often runs through the lead manager. That can speed things up, but it can lead to similar-looking frameworks across issuers.
An opinion has limits. Commentators describe it as a point-in-time assessment. Investors tend to treat a positive one as a condition for further analysis, not as a guarantee of environmental success or a substitute for their own due diligence. Do not present it as proof of impact.
Reporting after issuance
This is where most of the long-term effort sits. The IMF notes that green bonds carry a transparency burden greater than conventional bonds. Tracking of proceeds and environmental impact continues until maturity, so you need lasting data management and coordination between treasury, sustainability, finance and operational teams.
A useful reporting set has two parts.
Allocation report. Show the amount raised, the amount allocated by category, the unallocated balance and how it is held, and the split between new financing and refinancing. Keep the categories identical to those in the framework so readers can reconcile the two.
Impact report. Give the indicators you promised, such as energy saved, renewable capacity installed or emissions avoided, with the methodology and any assumptions. If you estimate rather than measure, say so.
Good habits that save time:
Assign a named owner to every indicator before issuance.
Reuse the data you already gather for corporate sustainability disclosures. Our piece on new GRI climate disclosure standards shows how those datasets overlap.
Think about who will read the report. Investors, regulators and communities want different detail, as we explain in the key audiences of an ESG report.
Look at how technology can reduce manual work, a theme we explore in the fusion of technology and the green bond market.
Avoiding greenwashing
The reputational risk is real. The Climate Bonds Initiative’s analysis of 2025 issuance, as summarised by Negotium Infinitum, suggests that about 17% of bonds marketed as green failed fundamental tests on use of proceeds, reporting transparency or project selection integrity. Treat that figure as indicative, since it is a secondary summary, but the direction is clear: investors are testing frameworks hard.
A short self-check before publishing:
Can every category be tied to named projects or a defined portfolio?
Do you disclose the refinancing share and look-back period?
Are the indicators measurable with data you actually hold?
Does the governance section name real roles, not just a committee title?
Is the review described accurately, as a point-in-time opinion?
Is there a plan to update the framework when rules change?
Where Exereco can help
A framework is only as strong as the data and skills behind it. At Exereco we combine sustainability news and analysis with ESG reporting software, advisory and compliance support, and ESG training. If your team is preparing to report on a green bond, our GRI Reporting course is a practical starting point for building the disclosure habits that allocation and impact reports rely on. For wider questions on your ESG reporting set-up, you can reach us through the Exereco homepage.
FAQ
Is a green bond framework mandatory?
No. It is a voluntary process document under the ICMA Green Bond Principles. In practice, investors expect to see one, and the IMF describes publishing a framework as standard market practice. If you want to use the European Green Bond designation, you must follow the separate requirements in Regulation (EU) 2023/2631.
How long does it take to write a green bond framework?
The drafting depends on how ready your project pipeline and governance are. The external review is easier to estimate: the IMF cites a provider median of around two weeks, and eight to twelve weeks for some sovereigns. Allow extra time for internal sign-off and for lead manager input.
What is the difference between a green bond framework and the EU Green Bond Standard?
The framework is your own document describing how you will manage and report on a green bond. The EU Green Bond Standard is a regulated, optional label with fixed rules, including 85% Taxonomy alignment and review by an ESMA-registered reviewer. A framework can be written to meet that standard, or to follow only the ICMA Principles.
What should green bond reporting include?
At minimum, an allocation report showing how proceeds were assigned and an impact report with the indicators you committed to. Keep categories consistent with the framework and explain your methodology. Reporting continues until the bond matures.
Does a second-party opinion guarantee a bond is green?
No. It is a point-in-time assessment that investors treat as a starting point. They still run their own analysis, and your ongoing reports are what demonstrate delivery.
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