How to Write an Expression of Interest for Business Opportunities and Partnerships

If you are chasing a commercial opportunity, a weak expression of interest can make your business look unfocused, risky or hard to work with.

Founders often make the same mistakes: they write a vague note that says too little, they promise too much before checking legal and commercial issues, or they treat the document like a binding contract without meaning to. That can create confusion before a proper deal even starts.

A good expression of interest, often called an EOI, should open the door to serious discussions without boxing you into terms you have not properly assessed. It needs to be clear about the opportunity, realistic about timing and scope, and careful about what is and is not intended to be legally binding.

This guide explains how to write an expression of interest for business opportunities and partnerships in the UK, when you should use one, what to include, where founders get caught out, and how to avoid turning early commercial interest into an avoidable legal problem.

Overview

An expression of interest is usually an early-stage business document used to signal serious interest in a deal, project, collaboration or partnership. It can help you secure a meeting, shortlist position or negotiation pathway, but it should be drafted carefully so it supports discussions without creating accidental commitments.

For UK businesses, the main job of an EOI is to show credibility, commercial fit and readiness while keeping room for due diligence and formal negotiation.

• Define the opportunity clearly, including the project, partnership or commercial arrangement you are interested in.
• State what your business brings to the table, such as relevant experience, capacity, delivery model or market reach.
• Be careful about legal language, especially around exclusivity, confidentiality, pricing, timelines and binding commitments.
• Check whether the EOI forms part of a tender, procurement process or pre-contract negotiation with set rules.
• Align the document with your wider business setup, including business structure, contracts, branding, trade mark plans and privacy obligations if information will be shared.
• Make sure the sign-off and next steps are practical, so the recipient knows whether you want a meeting, proposal stage, heads of terms or draft agreement.

What To Know Before You Start

For UK businesses, writing an expression of interest means showing genuine commercial intent without skipping the legal and practical checks that should happen before you sign a contract. It is not just a sales note. It sits in that space between first contact and formal agreement.

An EOI can be used in several settings. A startup might send one to a distributor, software platform, local authority, investor-backed partner, manufacturer or franchise operator. An established SME might use one to pursue a joint venture, supply arrangement, strategic collaboration, property opportunity or acquisition conversation.

What an expression of interest usually does

An EOI usually tells the other side three things. First, you are interested. Second, you are credible. Third, you understand enough about the opportunity to justify a deeper discussion.

That means the document often covers:

• who you are and what your business does
• why the opportunity suits your business
• what capability, funding, know-how or network you can contribute
• what assumptions you are making at this stage
• what next step you want to take

What it should not do by accident

An expression of interest should not accidentally lock your business into a deal before the real detail is worked through. This is where founders often get caught. They copy wording from a proposal or heads of terms, add estimated pricing or delivery dates, and send it out without thinking about whether those statements could later be relied on.

In the UK, whether a pre-contract document becomes binding depends on the wording, the surrounding conduct and what the parties appear to have intended. Calling something an “expression of interest” does not automatically make it non-binding. If the content looks definite enough, or if it includes language suggesting agreement, you may create arguments later about what was promised.

Why this matters beyond one document

A strong EOI also forces you to test whether your business is actually ready for the opportunity. Before you spend money on company setup, invest in branding, register a domain or print packaging for a proposed collaboration, you should be clear on who the contracting party will be and what obligations may follow.

That means checking your wider business position, including:

• your business structure, for example whether you are trading as a sole trader, partnership or limited company
• whether the trading name or business name you plan to use is available and sensible from a brand and trade mark perspective
• whether you have customer terms or supplier agreements that support the deal model you are proposing
• whether personal data may be exchanged, requiring a privacy notice, data processing terms or confidentiality protections
• whether any sector-specific licence or permission issues could affect delivery

If your EOI promises an online sales rollout, white-label product launch or exclusive territory arrangement, you should also consider what selling online, registration details, fulfilment terms and IP ownership will look like if the deal proceeds.

When This Issue Comes Up

This issue comes up whenever a business opportunity is real enough to justify a formal statement of interest, but not mature enough for a full contract. The main challenge is getting the tone right: serious, but not reckless.

Tenders and procurement opportunities

Many EOIs appear in procurement and tender processes. A local authority, housing association, university or large company may invite expressions of interest before selecting bidders for the next stage. In that setting, the EOI often has a specific format and deadline.

If you are responding to that kind of process, the key point is to follow the instructions exactly. If the issuer asks for turnover figures, team experience, insurance details or case studies, give what is requested and avoid padding the response with marketing language that does not answer the brief.

Commercial partnerships

Partnership discussions often start with an EOI when both sides want to test strategic fit before drafting heads of terms. This is common where businesses are exploring:

• distribution or reseller deals
• joint marketing arrangements
• technology integration partnerships
• manufacturing or supply collaborations
• licensing opportunities
• co-branded products or services

Before you sign anything more formal, an EOI can set out the broad concept, why the arrangement makes sense and what both sides may want to explore. It should stop short of pretending the detailed legal work is already done.

Property and site opportunities

Some businesses use EOIs when pursuing premises, concessions, pop-up locations or space within another business. A café operator may express interest in a venue. A retailer may approach a landlord or managing agent for a unit. A health or wellness brand may seek space within a gym chain.

In those situations, the legal details can become complicated quickly. Rent, fit-out rights, term length, permitted use, signage, landlord consent and service charges all matter. Your EOI can indicate interest and suitability, but it should not read like a final commercial lease commitment unless you are ready for that.

Investment-adjacent and acquisition discussions

Founders sometimes use EOIs in early investment-adjacent settings, especially where a strategic partner, buyer or merger candidate wants a written expression of intent before opening up more confidential discussions. A short EOI may be appropriate, but you should take extra care with valuation language, exclusivity, confidentiality and access to commercially sensitive information.

If the opportunity could lead to a share sale, asset purchase or joint venture, the document should be particularly clear about what remains subject to due diligence, board approval, financing, internal sign-off and formal documentation.

Practical Steps And Common Mistakes

The best way to write an expression of interest is to keep it commercially persuasive, fact-specific and legally disciplined. Say enough to show you are serious, but do not fill the gaps with promises you have not tested.

1. Start with the commercial purpose

Your opening should identify the opportunity and why you are writing. Keep it direct. The recipient should understand within a few lines whether you are expressing interest in a partnership, project, supply deal, lease opportunity or collaboration.

A clear opening usually covers:

• the specific opportunity or project
• the parties involved
• why your business is interested
• the stage you would like the discussion to move to next

Avoid generic statements that could fit any deal. If you are writing to explore a partnership with an online retailer, say what kind of partnership and what your business would contribute.

2. Explain who your business is, briefly

You do not need to tell your whole origin story. Give the information that makes your interest credible. This might be your trading history, sector experience, customer base, product capability, technical expertise, delivery capacity or local presence.

If relevant, refer to practical business basics that support trust, such as your company registration status, regulated permissions where applicable, insurance position or existing operating model. Keep it proportionate to the opportunity.

3. State what you are proposing

An EOI should be more than “we are interested”. It should sketch the shape of the arrangement you want to discuss. That might include territory, service scope, product category, target audience, roll-out model or commercial rationale.

Where you need to mention proposed terms, frame them carefully. For example, you might say that commercial terms, implementation timing and technical integration would be subject to further discussion and formal agreement.

If multiple points follow, organise them clearly:

• the business objective
• the proposed collaboration model
• the likely responsibilities of each party
• the assumptions behind the proposal
• the matters still to be agreed

4. Be careful with binding language

This is one of the most important drafting points. If you do not intend the EOI to be a final or partly binding agreement, say so carefully and consistently. Do not insert a non-binding line at the end if the rest of the document reads like a concluded deal.

Founders often undermine themselves by using language such as “we agree”, “will supply”, “exclusive partner”, “binding commitment” or fixed price promises before due diligence is complete. If you are not ready to commit, use wording that reflects intention and further negotiation.

You should also think separately about whether any parts are intended to be binding. In some cases, parties want only certain points, such as confidentiality or exclusivity for a limited period, to be legally enforceable while the broader commercial proposal remains subject to contract. If you take that approach, the drafting needs to be precise.

5. Use confidentiality properly

If you expect either side to share sensitive information, address confidentiality early. An EOI is not always the right place for a full confidentiality regime, but it can flag that discussions and shared information are confidential and may need a separate non-disclosure agreement.

This matters especially where the opportunity involves:

• product roadmaps
• pricing models
• customer data
• technical documentation
• source code or proprietary processes
• business plans and financial information

If personal data might be exchanged, privacy obligations also come into play. UK businesses should think about UK GDPR-style transparency, lawful handling of personal data and whether any data sharing arrangement or processor terms may be needed later.

6. Do not overstate your capacity or rights

A common mistake is claiming you can deliver something before checking whether you actually can. If you say you can supply nationwide in 30 days, use a co-brand, launch online immediately, or onboard 10,000 users to a platform, make sure that is realistic.

The same applies to intellectual property. Before you promise a partner use of a brand, software feature, design asset or product packaging, check who owns it and whether you have the right to license or adapt it. This is particularly important before you invest in branding or print any co-branded material.

7. Match the document to the stage of the deal

Some opportunities need only a concise page or two. Others require more structure because the other side is comparing several applicants or assessing financial and operational suitability. The right level of detail depends on the process.

A useful rule is this: include enough detail to justify the next meeting or next stage, but save the fine-grain legal and commercial negotiation for heads of terms or the formal contract.

8. Check consistency with your contracts and operations

An EOI should line up with the way your business really works. If you already trade through supplier terms, distribution terms, software terms or online customer terms and conditions, your proposal should not contradict them without good reason.

For example, if your proposed partnership would involve selling online through a new channel, think about:

• who contracts with the end customer
• who handles refunds and complaints
• who controls pricing and promotions
• who owns customer data and mailing lists
• who is responsible for website terms, privacy notices and compliance messaging

These issues may not need full answers in the EOI, but you should not ignore them if they are central to the model being proposed.

9. Include sensible next steps

Every EOI should end with a practical ask. That might be a meeting, access to a data room, an invitation to tender, a draft heads of terms process or a request for further information.

Avoid ending with a vague statement that you “look forward to hearing from you”. Be specific about the next milestone and who should contact whom.

Common mistakes to avoid

The same drafting problems show up again and again. The main ones are:

• using generic wording that does not show why the opportunity suits your business
• treating the EOI like a marketing brochure instead of a commercial document
• making statements that sound binding when you mean them to be exploratory
• offering fixed pricing or deadlines before costs and capacity are checked
• forgetting confidentiality and data sharing issues
• promising rights to branding, content or technology you do not clearly own
• ignoring business structure, registration details or contracting authority issues
• sending the document without internal sign-off from the right decision-maker

If the opportunity is substantial, ask who in your business has authority to make the statements in the EOI. This sounds basic, but it matters. A founder, sales lead or partnerships manager can create expectations externally even if final board or director approval is still required.

FAQs

Is an expression of interest legally binding in the UK?

Not always, but it can create legal arguments if it is drafted like a concluded agreement. Whether it is binding depends on the wording, context and what the parties appear to have intended. Clear drafting matters.

What is the difference between an expression of interest and heads of terms?

An expression of interest usually comes earlier and is often lighter touch. Heads of terms normally go further by setting out the proposed commercial deal structure in more detail before the final contract is prepared.

Should I include price or commercial terms in an EOI?

You can include high-level commercial indications if they help move the discussion forward, but avoid presenting them as fixed commitments unless you are ready to stand behind them. If key assumptions are unresolved, say so.

Do I need a confidentiality agreement before sending an EOI?

Not in every case, but if either side will share sensitive business information, a confidentiality agreement is often sensible. At minimum, think carefully about what you disclose in the EOI itself.

Who should sign an expression of interest?

It should be signed or sent by someone with suitable authority inside the business. If final approval is still needed, that should be reflected clearly so the other side does not assume the deal is already authorised.

Key Takeaways

• An expression of interest is an early-stage commercial document that signals serious interest without necessarily creating a final deal.
• The strongest EOIs are specific about the opportunity, realistic about what your business can offer and clear about the next step.
• Founders often get caught by vague drafting, accidental binding language, overpromising on delivery, and ignoring confidentiality or IP issues.
• Before you sign or send an EOI, check how it fits with your business structure, trade mark position, contracts, privacy setup and any licence-style requirements relevant to the opportunity.
• If only certain parts are meant to be binding, such as confidentiality or exclusivity, the drafting should say that clearly and consistently.
• A good EOI should help you start the right commercial conversation, not create avoidable disputes before formal terms are agreed.

If your business is dealing with how to write an expression of interest for business opportunities and partnerships and wants help with confidentiality agreements, heads of terms, partnership contracts, trade mark and branding checks, you can reach us on 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.