A reliance letter is a document issued by a professional, such as an appraiser, environmental consultant, accountant, or attorney, that gives a named third party the legal right to use and trust a report the professional originally prepared for someone else. Without one, only the original client can hold the professional responsible if the report turns out to be wrong. With one, the third party gains standing to rely on the report’s accuracy and to bring a claim if the work was negligent.
Why the Letter Is Necessary
The reason comes down to privity of contract. Only the parties to an agreement can enforce it or sue when something goes wrong. If an accountant audits Company A and a lender later reads that audit to decide whether to extend a loan, the lender has no contractual relationship with the accountant. Errors that cost the lender money ordinarily cannot be pinned on the accountant, because no duty of care runs between them.
A reliance letter closes that gap. By issuing one, the professional effectively treats the third party as an additional client for purposes of that specific report. The third party gets the same right to rely on the report that the original client has. If the professional was negligent, the relying party now has standing to sue. Professionals treat this as a serious step, since it expands who can hold them liable, which is why reliance letters are negotiated rather than automatic.
Transactions Where Reliance Letters Come Up
Reliance letters appear anywhere one party paid for professional work and another party needs to use it.
Phase I Environmental Site Assessments
This is the single most common context. In commercial real estate, the seller or borrower usually orders the Phase I report, but the lender financing the deal needs assurance that the property doesn’t carry hidden contamination liability. Without a reliance letter, the lender cannot treat the report as its own.
SBA-backed loans go further. They require a specific reliance letter template that the environmental consultant must sign without changes, together with proof of at least $1,000,000 in professional liability insurance. A modified or missing letter means the report gets rejected and the loan stalls.
The letter also matters for federal liability protection. Under CERCLA, a buyer who conducts proper environmental due diligence can qualify as a bona fide prospective purchaser, which shields them from cleanup liability. When a buyer uses an existing Phase I rather than ordering a new one, obtaining a reliance letter is treated as a best practice for preserving that defense. The report itself must be dated within one year of the acquisition.
Real Estate Appraisals
A buyer hires an appraiser; the lender funding the purchase wants to use that same appraisal rather than order a separate one. A reliance letter from the appraiser lets the lender treat the valuation as if it had been prepared for them. This is routine in commercial mortgage lending, where appraisals can cost tens of thousands of dollars.
Mergers and Acquisitions
Target companies arrive at the deal table with existing audits, tax opinions, and due diligence reports prepared by their own advisors. The acquiring company and its lenders need to rely on that work to decide whether to proceed and at what price. Reliance letters from the target’s accountants, lawyers, and consultants let the buyer’s side use those reports without starting over.
Legal Opinions in Syndicated Loans
A borrower’s attorney typically addresses a legal opinion to the lead lender. In a syndicated loan with multiple participants, each lender needs its own right to rely. The borrower’s counsel issues reliance letters extending the opinion to each additional lender. Courts have recognized that a legal opinion can only be relied upon by its addressee or by someone expressly authorized, so these letters are essential in multi-lender deals.
Construction and Engineering
A contractor commissions a geotechnical or structural report. The owner, the project lender, or a future buyer of the completed building may need to rely on that same report. A reliance letter from the engineer extends coverage to those parties.
What the Letter Contains
Language varies by profession and transaction, but the same core elements show up in every reliance letter.
- Identification of the professional who issued the original report, the original client, and the third party now being granted reliance.
- A reference to the specific report by title, date, and subject. Vague language like “our work” is not sufficient.
- An explicit grant stating that the named third party may rely on the report as if it had been prepared for them.
- A scope limitation restricting reliance to a stated purpose, such as evaluating a loan application or completing a purchase. Using the report for an unrelated purpose falls outside the letter’s protection.
- Liability restrictions, including caps on financial exposure, exclusions for certain categories of loss, and time limits for bringing claims.
- A no-duty-to-update clause making clear that the professional’s responsibility runs only to information available as of the report date.
- A governing law provision specifying which jurisdiction controls any dispute.
The relying party typically signs and returns the letter, confirming they accept these terms. That signature turns the letter into a binding contract between the professional and the third party.
Liability Limits to Watch
Reliance letters are drafted in the professional’s favor. Every letter adds another potential plaintiff, so expect restrictions designed to limit recovery if something goes wrong.
Financial caps are standard. Total liability to the relying party is almost always capped at a specific dollar amount, often tied to the fee for the original report or to the limits of the professional’s indemnity insurance. A $1 million cap sounds protective until contamination cleanup or a failed deal runs into eight figures. You cannot waive liability for fraud, dishonesty, or negligence causing death or personal injury, but most other losses are on the table.
Time restrictions matter more than people expect. Letters often specify a limitation period shorter than the general statute of limitations. Some limit reliance to 180 days from the report date, after which the report needs updating. Many environmental reliance letters expire entirely after one year, requiring a new assessment. If your transaction timeline stretches, confirm the letter still covers you at closing.
Scope restrictions are the most commonly overlooked issue. A reliance letter for a legal due diligence review will state that the review covered only the documents provided and only legal matters, with no commercial analysis. If you assumed the lawyers vetted the business case rather than just the legal documents, the letter says otherwise. Read the scope language carefully before relying on any report for decisions beyond its stated purpose.
What a Reliance Letter Costs
The professional is taking on additional liability, and they charge for it. Fees vary by field, but environmental consulting offers a useful benchmark since reliance letters are routine there.
For a Phase I environmental site assessment, reliance letter fees typically run from $250 to $600. Letters covering both a Phase I and Phase II assessment usually fall between $850 and $2,000. Many firms charge 10% to 20% of the original report cost; others use flat rates. The fee reflects the drafting work, the extension of liability, and the involvement of the firm’s professional indemnity insurer.
For other professions, pricing is harder to generalize. An accounting firm adding a reliance party to an existing audit engagement may charge a few thousand dollars. A law firm extending a legal opinion to additional lenders in a syndicate may fold the cost into the overall opinion fee or charge per additional addressee. The original client or the relying party, or sometimes both, bears the cost. Build it into the transaction budget early.
If the Professional Refuses
Refusals are more common than people expect, especially among environmental consultants. Some firms will not work with clients who require reliance letters at all.
The concern is liability expansion. Consultants sometimes describe these as “permission to sue” letters. A report prepared for a borrower evaluating a property serves a different purpose than the same report used by a lender deciding whether to fund a loan. When one document serves two decision-makers with different risk thresholds and expectations, the professional’s exposure multiplies. The scenario professionals fear most is open reliance, meaning anyone, not just a named party, could claim the right to rely. Most firms will grant reliance only to specifically identified parties for exactly this reason.
If the original professional refuses, your options are limited. You can commission an independent report, which eliminates the reliance issue but costs more and takes longer. You can negotiate, since some refusals are really objections to scope or to the proposed liability cap rather than an absolute no. You can occasionally find another professional willing to review and adopt the existing report, though this is uncommon and brings its own complications.
How to Request One
The request usually originates with the third party that needs reliance, but it flows through the original client, because the professional’s contractual relationship is with that client. The deal’s closing checklist typically flags which reports need reliance letters, and the parties sort out who handles the request.
Start early. Reliance letters take time to negotiate, especially when the professional’s standard terms don’t match what the relying party needs. Discovering a week before closing that the lender needs a reliance letter on the Phase I is how deals get delayed. Raise the issue as soon as you know which existing reports will be reused.
Before engaging a professional for new work on a deal, confirm they are willing to issue a reliance letter when the time comes. Some firms disclose their position upfront; others treat it as a separate engagement. Ask about the fee, the standard terms, and whether they will work from the relying party’s template or require their own. For SBA-backed transactions, the template is prescribed and cannot be altered.
When you review the draft, focus on the liability cap, the limitation period, the scope of reliance, and any exclusions for consequential losses like lost profits. These are the provisions that will matter if something goes wrong. If the cap is unreasonably low relative to the transaction size, push back. If the limitation period expires before your deal closes, flag it immediately. A reliance letter that technically exists but provides no meaningful protection is worse than none, because it creates a false sense of security.