Should You Treat a Customer LOI as Proof of Demand?

A customer letter of intent (LOI) can be useful before your product is ready, but it is not proof of demand by itself. Treat it as a test of whether a real buyer will make a specific, time-bound commitment after you meet agreed conditions. A vague letter that says a company is “interested” is closer to a conversation than a sale.

The practical question is not, “How many LOIs do we have?” It is, “What did this customer agree to do, who agreed to it, and what happens next?”

Key takeaways

• Use an LOI to record a real commercial conversation, not to decorate a pitch deck.
• Ask for a buyer, a problem, a timeline, a price or volume, and measurable conditions.
• Separate a non-binding statement of intent from any clauses that may still create obligations.
• Prefer a paid pilot or contract when the buyer is ready; those commitments test willingness to pay more directly.

Start with the commitment, not the document

An LOI is a short document that records the proposed shape of a future business relationship. A startup-focused guide from JumpStart describes it as a way to gauge a potential client's commitment and says the customer should go through much of the same thinking as a real sale.

That makes the conversation around the LOI more valuable than the signature alone. Before asking for one, you should already know the customer's problem, the outcome they want, and what would make them buy. If you are using the letter to avoid asking those questions, you are collecting paperwork instead of evidence.

An LOI is strongest when it answers five questions:

1. Who is the buyer, and do they control or influence the budget?
2. What specific problem or use case are they agreeing to evaluate?
3. What will your product need to do for the commitment to continue?
4. What will the customer buy, at what price or volume, and by when?
5. What does each side have to do during the evaluation?

If the answer to most of these is “to be decided later,” the document may still help organize discovery, but it is weak demand evidence.

Grade the evidence inside the LOI

Not all signed letters carry the same signal. Deepchecks notes that investors have become skeptical of the broad use of “LOI” and highlights specificity as the difference: a credible letter states the intended purchase, timing, performance conditions, quantity, and price.

Use a simple evidence table before you count an LOI as traction:

Question	Weak signal	Stronger signal
Signer	Interested user	Budget owner or purchasing decision-maker
Product	General future solution	Named use case and measurable acceptance criteria
Timing	“When available”	A dated evaluation and purchase decision
Economics	Price to be negotiated later	Proposed price, volume, or purchase range
Customer effort	A signature only	Scheduled access, feedback, data, or paid evaluation
Next step	No owner	A named person and calendar date

This is not a scoring system that turns an LOI into revenue. It is a way to stop the team from treating every signature as equivalent.

Use the LOI to expose the real sales process

The most useful LOI exercise often happens before the document is signed. Ask the customer to explain how the decision would actually happen. Who must approve it? What budget does it come from? What security, procurement, or implementation review is required? What result would make the buyer continue?

Those questions can reveal that the person who likes the product is not the person who can buy it. They can also uncover a long approval path that changes your launch plan. The letter is doing its job if it makes the path clearer, even when the customer decides not to sign.

Cooley GO recommends using a term sheet or LOI to establish expectations about topics such as obligations, pricing, intellectual property, and exclusivity before the full commercial contract is drafted. For a young startup, that is a useful reminder: do not postpone every important business question until legal review.

Write down the commercial assumptions you need to test:

• the customer problem and expected outcome;
• the product scope and what is explicitly excluded;
• the evaluation window and decision date;
• the expected price, volume, or conversion to a paid agreement;
• the people responsible for delivery, evaluation, and approval.

Then ask whether the customer is willing to make a small but real commitment, such as scheduling evaluation time, providing access to the right users, paying for a pilot, or agreeing to a purchase decision after defined criteria are met.

Know when an LOI is the wrong tool

An LOI is not the best next step for every early customer. If the customer is ready to use the product now, a paid pilot or ordinary commercial agreement tests willingness to pay more directly. If the product is still being shaped through close collaboration, a design partner agreement may describe the two-way work better than a future-purchase letter.

Common Paper's design partner agreement is built around explicit obligations such as feedback sessions, early access, product functionality, fees, and future pricing. That structure fits a relationship where the customer is helping you learn, not simply promising to buy a finished product later.

Choose the smallest commitment that answers the question you actually have:

• Need to know whether the buyer will make time? Set a scheduled evaluation with named participants.
• Need to know whether the problem is valuable enough to pay for? Run a paid pilot.
• Need to know whether a nearly finished product fits procurement? Use an LOI with a decision date and commercial terms.
• Need ongoing product input? Use a design partner agreement with clear responsibilities.

Do not call a free pilot, a logo, a conversation, and a signed LOI the same kind of traction. Each one proves something different.

Treat the legal label carefully

“Non-binding” does not mean “nothing in this document matters.” Cooley GO explains that term sheets can be binding, non-binding, or partly binding. Confidentiality, exclusivity, intellectual-property, or other provisions may carry consequences even when the purchase statement itself is conditional.

This article is commercial guidance, not legal advice. Do not copy a template, promise exclusivity, transfer intellectual property, or describe a future purchase as guaranteed without having qualified counsel review the actual language and the laws that apply to your company and customer.

FAQ

Is a signed LOI the same as a customer?

No. It is evidence of stated intent under stated conditions. Until the customer pays or signs a binding commercial agreement, the sale may not happen. Keep LOIs in a separate category from revenue, active pilots, and contracts.

What should a startup put in an LOI?

At minimum, describe the product or use case, the customer's expected benefit, the evaluation period, the conditions that must be met, the intended price or volume, the decision date, and each party's responsibilities. A short document is easier to review, but short does not mean vague.

Should an early startup ask for an LOI or payment?

Ask for the commitment that matches the customer's readiness. If the product is not usable yet, an LOI or design partner agreement may help test a future purchase. If the customer can use it now, payment is stronger evidence. In either case, agree on what happens next before you count the commitment as progress.

Wrap up

Pull every LOI into one table and mark the signer, use case, acceptance criteria, price, decision date, next action, and whether the customer has committed time or money. If those fields are blank, the document is telling you what to clarify, not proving that demand is solved.

If you want peers to pressure-test the commitment before you build around it, bring the table and the proposed next step to the buildpurdue cohort.