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Every guarantee is a bet. The only question is whether you wrote the terms of the bet or left them for the buyer to imagine.
A guarantee can be the most persuasive line on an offer, because it moves risk from the buyer to you. It can also be the most expensive sentence you ever write, if "guaranteed" means one thing in the sales conversation and a different thing in the buyer's head three weeks later. This is educational and not legal advice. The goal here is a guarantee that is generous where it should be and specific where it has to be.
Why do guarantees work, and where do they go wrong?
They work because they answer fear. They go wrong when they answer it with a vague promise.
Christopher Hart opened his Harvard Business Review article on service guarantees with an observation that still holds: buyers of products usually get warranties, but buyers of services rarely do, even though services are where "the assurance of a guarantee would presumably count most."1 Coaching and consulting are services. The buyer is paying for an outcome they cannot inspect first. That is exactly where risk reversal helps, and it also eases the buyer's remorse window.
Where it goes wrong
Three failure modes show up again and again. The guarantee is too vague, so every dispute becomes an argument about intent. It is too broad, so it covers clients who never did the work. Or it is misleading, promising a result the offer cannot support.
Dan Martell gave the opposite advice on vagueness in a video he posted on January 20, 2026, about offers for new service businesses.6
Make a promise that's specific around a result in a very specific time frame.
I agree on specific. I would add one limit: the result has to be something you control and can substantiate, which is why the guarantee below is built on participation and deliverables.
What does a participation-based guarantee look like?
It says: if you do the agreed work and it does not deliver what we defined, here is what I do.
The five parts
- The commitment. What the client must do: attend a number of sessions, complete named deliverables by named dates, submit materials on time.
- The promise. What you commit to do or deliver, stated as something observable. Avoid promising a result outside your control.
- The remedy. What the client gets if the promise is not met: extra work at no charge, a credit, a partial refund or a full refund. Pick one and state it (more in Refund Policies That Protect Cash and Reputation).
- The window. How long after the program ends the client has to make a claim.
- The process. How to claim: who to contact, what to submit and how fast you will respond.
An example, for illustration only
"Complete the twelve sessions and the five milestone deliverables on schedule. If you do and we have not produced the agreed deliverables, I will keep working with you at no charge for up to 60 days. If we still have not, tell me within 30 days of the program ending and I will refund your payment." Have your own counsel review the wording for your state before you use anything like it.
| Vague guarantee | Conditional guarantee |
|---|---|
| "100% guaranteed results" | "If you complete the defined work and we miss the agreed deliverables, here is the remedy" |
| Applies to everyone, always | Applies to those who did the work |
| No claim process | A named contact, a form and a response time |
| Discovered in a dispute | Stated on the call and in the agreement before payment |
What does the FTC say about guarantee wording?
More than most people expect.
The FTC's Guides for the Advertising of Warranties and Guarantees, Section 239.3, say a seller should use terms such as "Satisfaction Guarantee," "Money Back Guarantee" or "Free Trial Offer" in advertising only if it refunds the full purchase price of the advertised product when the purchaser requests it. The same section says an ad that mentions such a guarantee should disclose any material limitations or conditions with clarity and prominence that prospective buyers will notice and understand.2
What that means for a conditional guarantee
If your guarantee is conditional, the safest move is to not use the bare phrase "money-back guarantee" without the conditions beside it. Name it for what it is, such as "completion guarantee," and put the conditions next to the promise, where the buyer cannot miss them. Whether the Guides apply to your particular service and how states treat it are questions for your counsel.
A guarantee is not proof
If your guarantee sits next to an income or results claim, remember that it does not substitute for evidence. FTC business guidance says a refund policy is not a defense for making deceptive income or lifestyle claims, and that earnings claims need a reasonable basis.3 In January 2025 the FTC also proposed extending its Business Opportunity Rule to cover "money-making opportunities, such as business coaching and investment opportunities," with written substantiation required for earnings claims.4 At that point it was a proposal, so confirm its status with counsel. Either way, publishing a guarantee next to a number you cannot prove makes the number riskier, not safer.
How do you keep a guarantee from being abused?
Clear terms, simple records and consistent follow-through.
Define participation in numbers
"Did the work" is not a standard. "Attended at least ten of twelve sessions and submitted four of five deliverables" is. Keep an attendance and deliverables log for every client (the same habit as client results tracking), so you can answer any claim with facts instead of memory.
Keep the claim window short and honest
Choose a window that fits your offer, such as thirty or sixty days after the program ends, and say it plainly. Open-ended guarantees are hard to enforce and hard to price.
Treat every claim the same way
Respond quickly, politely and by the policy. Whether the client is friendly or angry, the process is the same. Consistency is what makes the policy fair, and it removes the temptation to make exceptions that teach clients that terms are negotiable.
- Client claimsWithin the stated window, through the named contact
- Check the logAttendance and deliverables, in numbers
- Apply the policyThe same way for every client
- Deliver the remedyExtra work, a credit or a refund, as written
How should you say it in the sales conversation?
Say the terms out loud, and invite questions.
You can say: "Here is exactly what I guarantee and what I need from you for it to apply. Let me walk through it, and please stop me if anything is unclear." Then send the same words in writing before payment. If a prospect hesitates at the conditions, that is useful information. A guarantee that scares off people who do not intend to do the work is doing its job.
Write it like a contract
The offers I trust most are the ones where both sides know what they are agreeing to. If you sell coaching, my page for coaches shows how I think about the whole offer. A guarantee with terms earns more trust than a bold one without, because the buyer can see you thought it through.
A guarantee is not a slogan. It is a small contract, so write it like one.
Keep building.Ekai
Questions people ask
What is a participation-based guarantee?
It is a guarantee that applies only if the client does the agreed work, such as attending sessions and completing defined deliverables. It lowers the buyer's risk while protecting you from claims by people who did not participate.
Do I have to refund the full price if I say 'money-back guarantee'?
The FTC's guides on warranties and guarantees say terms like 'Money Back Guarantee' and 'Satisfaction Guarantee' should be used only if the seller refunds the full purchase price when the purchaser asks, and that any material limitations or conditions should be disclosed clearly and prominently. Talk to counsel about wording for your offer and state.
Can I guarantee income or results?
Be careful. FTC guidance says earnings claims need a reasonable basis and that a money-back guarantee is not a defense for deceptive income claims. A guarantee does not replace proof for the claim it sits next to.
How do I prevent guarantee abuse?
Define participation in measurable terms, set a claim window, require simple documentation and apply the policy consistently. Clear terms protect honest clients as much as they protect you.
Sources
- 1
- 216 CFR Part 239: Guides for the Advertising of Warranties and Guarantees, Section 239.3
Legal Information Institute, Cornell Law School, May 21, 1985
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