An engagement letter defines the scope, timeline, and fee structure before a CAM audit begins. Here's what one covers and a template structure you can use.
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Find My OverchargesSee a sample report firstTL;DR: A CAM audit engagement letter is a contract between a tenant and a professional audit firm that defines scope, fees, and timelines before the audit starts. If you hire a CPA or contingency auditor, you need one. If you use CAMAudit, the software handles everything directly without a separate engagement agreement.
“Traditional audit firms work on contingency because they know overcharges are reliable. That model works, but tenants should read the engagement letter carefully before signing. The fee structure, the cap on recovery, and the exclusivity clause all affect how much of your recovery you actually keep.”
When you hire a professional audit firm or CPA to review your CAM reconciliations, the relationship starts with an engagement letter. This document is not boilerplate. It defines exactly what will be audited, who pays what, what documents you need to provide, and what happens if the auditor finds nothing. Getting this right before the audit starts prevents disputes between you and your auditor that would otherwise derail the process.
This guide covers what a CAM audit engagement letter includes, what the sample language looks like for the sections that matter most, and the red flags to look for before you sign.
An engagement letter is a formal agreement between a tenant (or their representative) and a professional audit firm that defines the terms of an audit engagement before any work begins. It is essentially a services contract, though in the CAM audit world it often functions more like a contingency fee arrangement.
The letter creates mutual obligations. The tenant agrees to provide the required documents, cooperate with the auditor, and pay the agreed fee structure if overcharges are found. The audit firm agrees to conduct the audit within the defined scope and timeline, deliver a written findings report, and notify the landlord of the dispute as specified in the agreement.
Most commercial tenants who hire traditional audit firms should expect to sign one of these before the firm will begin. The letter protects both parties and prevents misunderstandings about scope ("I thought you were auditing five years, not two"), fees ("the contingency applied to what exactly?"), and deliverables ("where is the formal dispute letter draft I expected?").
A note on self-serve software: CAMAudit is not a traditional audit firm. It is software you run yourself. There is no engagement letter because there is no third-party firm to engage. You upload your documents, the tool runs the analysis, and you receive your audit report and dispute letter draft directly. This removes the engagement letter step entirely, along with the contingency fee that comes with it.
If you are evaluating whether to hire a contingency firm or use software, see the comparison at Should I Hire a CAM Auditor? and CAM Audit: In-House vs. Outsourced vs. Software.
You need a CAM audit engagement letter when:
You do not need an engagement letter for self-serve software tools or for conducting an internal review of your own reconciliation documents.
Identifies the tenant, the audit firm, and the date the engagement begins. Seems obvious, but the effective date matters for two reasons: it establishes when your dispute window is running relative to the audit, and it is the reference point for deliverable timelines elsewhere in the letter.
Make sure the "tenant" named is the correct legal entity that is a party to the lease. A mismatch here can create procedural complications if the dispute later goes to mediation or court.
This section defines which lease years will be audited and which expense categories are in scope. It is the most important section in the letter.
Lease years: Specify the exact calendar years or reconciliation periods. "2022 through 2024" is clear. "Recent years" is not. If your lease has a three-year lookback window, the scope should reflect that exactly.
Expense categories: Some engagement letters exclude certain categories from scope, either because the auditor does not handle them or because you agreed to limit the engagement. Common exclusions include real estate taxes (if you have a separate tax consultant handling those) and insurance.
What is not in scope matters as much as what is. If the engagement letter excludes management fee calculations, you cannot rely on the audit firm to find management fee overcharges even if they are the largest error in your reconciliation.
The auditor cannot audit without records. This section lists what the tenant is responsible for delivering and what the auditor will request from the landlord.
Standard tenant-provided documents:
Landlord-requested documents (the auditor handles the request):
If the landlord fails to provide required records within the lease-specified period, document that failure in writing. It is additional leverage.
Two models dominate the industry: contingency and flat fee.
Contingency fee structure (sample language):
"The audit firm's compensation shall be [X]% of all overcharges identified and recovered through settlement, credit, or payment during the Engagement Period. 'Recovered' means any amount actually credited to tenant's account or received by tenant as a direct payment. The audit firm shall receive no compensation for overcharges identified but not recovered. The minimum engagement fee of $[Y] shall apply regardless of recovery outcome."
Contingency rates in the CAM audit industry typically run 25-33% of the amount recovered. On a $20,000 recovery, that is $5,000-$6,600 to the auditor. The firm takes the risk of finding nothing; you pay more if they find a lot.
Flat fee structure (sample language):
"The audit firm's compensation shall be a fixed fee of $[X], payable as follows: $[Y] upon execution of this letter, and $[Z] upon delivery of the audit findings report. The flat fee is payable regardless of whether overcharges are identified. Tenant shall not be entitled to a refund of the flat fee if no overcharges are found."
Traditional firms charge $2,000-$5,000 for a flat-fee engagement before any contingency. The advantage is you know your cost upfront. The disadvantage is you pay it even if the audit finds nothing.
Hybrid (most common in practice):
A lower flat fee ($500-$1,500) to cover document review, plus a contingency of 15-25% on amounts recovered above a minimum threshold.
Specify when the audit will be complete and what the deliverables are. A vague timeline is in the auditor's interest, not yours.
Typical language:
"The audit firm shall deliver a written findings report within [60] days of receipt of all required documents from both tenant and landlord. The findings report shall identify each overcharge by category, calculate the dollar amount of each overcharge, and cite the specific lease provision at issue."
Push for a dispute letter draft as a deliverable. Not all firms include this automatically. If the engagement letter does not list it, it may not be included.
The auditor will see your lease, your payment history, and your landlord's internal expense records. The confidentiality section should prohibit the auditor from disclosing these materials to any party other than you and from using them for any purpose other than this audit.
Watch for language that permits the auditor to use anonymized data from your audit in published benchmarks or databases. That is standard in the industry but worth knowing about.
The auditor should disclose any existing relationships with your landlord, their property management company, or any related parties. An auditor who has worked for the landlord or has an ongoing relationship with the property management company may not be fully independent.
For contingency arrangements, this section confirms the auditor receives nothing (or just the minimum fee). For flat-fee arrangements, confirm you do not get a refund. Some firms offer a "CAM Verified" finding as a deliverable even when no errors exist, which has value as documentation that you did conduct a review.
Defines how and when the auditor will notify the landlord of the audit and the dispute. This matters because some leases require the tenant to provide advance notice before invoking audit rights, and the notification letter starts that clock.
Make sure the auditor is invoking your audit rights properly under your specific lease language, not using a generic notice that could be challenged on procedural grounds.
The engagement letter should specify which state's law governs disputes between you and the auditor. For multi-state portfolios, this is the state where the auditor is based or where most of the audited properties are located.
High contingency percentage with no cap on fees. A 33% contingency on a $100,000 recovery is $33,000 to the auditor. Caps protect you from paying an outsized fee when a single large error drives the recovery.
Exclusivity clauses. Some engagement letters prohibit you from engaging another auditor or taking your own legal action during the engagement period. If you are locked in for two years and the auditor is slow, you have no options. Push to limit the exclusivity period to no more than 12 months.
"Net recovery" vs. "gross recovery" definitions. If the auditor's contingency is calculated on gross overcharges identified (not just what you actually collected), you could owe fees on amounts the landlord disputes and never pays. Insist on contingency calculated on amounts actually recovered.
No delivery deadline. An auditor with no contractual timeline has no incentive to move quickly. Six months of delay on a 3-year lookback means you may miss your dispute window on the oldest year.
Automatic renewal. Some engagement letters auto-renew annually unless you cancel in writing within a specified window. Set a calendar reminder.