How to Spot a Duplicate Utility Charge in CAM Statements
Utility charges are one of the most reliably confusing categories in commercial lease billing. They show up in multiple places, under different names, on different schedules. A bookkeeper who codes each invoice as it arrives without checking the CAM reconciliation is likely to approve a duplicate charge at some point. For more context, see CAM red flags accounting firms should know.
The duplicate utility charge is not usually malicious. It often results from how landlord billing systems are structured. But the tenant pays the same cost twice regardless of the cause, and the recovery is straightforward once the duplicate is documented.
Here is how these duplicates arise and the steps bookkeepers can take to catch them.
Why Utilities End Up in Two Places
In a typical NNN lease, the CAM pool includes common area operating expenses. That category usually covers common area utilities: lighting for lobbies and hallways, power for elevators, electricity for shared HVAC equipment, parking lot lighting. These are allocated to each tenant via the annual CAM reconciliation based on pro-rata share.
The same building might also have direct utility billing arrangements for certain tenants. A dental practice in a medical office building might receive a direct monthly invoice for HVAC usage in their suite, separately metered. A retail tenant might receive a monthly charge for their exterior signage lighting, billed as a direct pass-through.
When the scope of the CAM pool utility allocation and the scope of the direct utility invoice overlap, the tenant is paying for the same megawatt-hours twice. The reconciliation allocates their share of building electricity. The separate invoice charges them for building electricity again under a different line description.
The amounts are usually not identical because the billing mechanisms differ. That is exactly why the duplicate is hard to spot: the invoices look different, but the underlying cost is the same.
What a Duplicate Looks Like in the GL
When both charges are coded and posted, the general ledger shows:
- A CAM operating expense entry from the monthly estimated payment or annual reconciliation true-up, coded to occupancy expense or rent expense
- A separate utilities expense entry from the standalone landlord invoice, coded to utilities or facilities costs
If the bookkeeper uses different accounts for the two charges, they may not appear adjacent to each other in the expense report. The occupancy cost bucket shows the CAM allocation, the utilities bucket shows the direct charge. Nobody reviews both together against the lease definition of what is in the CAM pool.
On an expense report for a 3-location retailer, this means three simultaneous duplicate charges, each appearing in a different accounting dimension, none of them obviously related without a cross-reference.
The Cross-Reference Check
The check that catches duplicates is comparing the description of each standalone utility invoice against the CAM reconciliation line items for the same period.
Start with the CAM reconciliation. Find the utility line items in the building operating expense total. These might be labeled "Common Area Electric," "Utilities," "HVAC Operating Cost," or similar. Note the expense category and the period.
Then pull the standalone utility invoices the client received from the landlord during the same period. Note their descriptions.
Ask: could the cost described on this standalone invoice be the same cost that is already captured in the CAM pool allocation? If the CAM pool includes "Common Area Electric" and the standalone invoice says "Building Electrical Charge," you have a potential duplicate and need to go to the lease to confirm.
Reading the Lease for Utility Scope
The lease should tell you two things:
What is in the CAM pool. The operating expense definition or the CAM pool definition should list included categories. If utilities or common area utilities are listed as included, they are supposed to flow through the reconciliation.
What is billed directly. If the lease has a separate utility charge provision, it should describe the scope. "Tenant shall pay directly to Landlord a monthly charge for electricity consumed within the Premises" describes in-suite consumption, not common area allocation. If the scope is limited to the Premises, it should not overlap with the common area utility allocation in the CAM pool.
When the lease has both provisions and the scope of each is clearly delineated (suite direct, common area via reconciliation), there is no duplicate. When the scope of the direct charge is vague or potentially overlapping with the CAM pool definition, you have a contract issue that needs to be raised with the landlord.
Dollar Impact: What to Expect
The range for a duplicate utility charge depends on building type, tenant size, and which utility is duplicated.
Common area electricity in a mid-size office building might represent $40,000 to $80,000 per year in total building expenses. A tenant with a 10% pro-rata share would pay $4,000 to $8,000 of that through the CAM reconciliation. If they are also receiving a separate "building electric" invoice that covers the same cost, their duplicate exposure is in the same range.
In practice, our tool most commonly flags duplicate utility amounts in the $800 to $3,000 per year range for office and retail tenants. The cases on the higher end involve tenants with larger footprints or buildings with high utility intensity like medical or fitness properties.
The Year-Over-Year Pattern
Duplicate charges are often not a single-year problem. If the standalone invoice has been running since lease commencement and the CAM pool has also included the same utility category throughout, the duplicate extends back to the beginning of the billing relationship.
That means the audit window is relevant. Most leases give 12 to 24 months from the reconciliation delivery date to dispute the CAM allocation. The standalone invoices may have a shorter path to dispute, but if they are also covered by the CAM audit right, all years within the window are recoverable.
Controllers reviewing a duplicate utility charge should calculate the annual overcharge and multiply by the number of years within the audit window. What looks like a $900 annual problem may be a $2,700 recoverable claim for three years of billing.
What to Document Before Raising the Dispute
Before contacting the landlord, the bookkeeper should have:
Both billing records. The CAM reconciliation lines showing the utility category and the standalone invoices showing the same category, for the same period.
The lease clause. The operating expense definition that includes utilities in the CAM pool, and the direct utility billing provision if one exists.
The calculated overcharge. Dollar amount per year, total for all years within the audit window.
The delivery dates of each reconciliation. Needed to confirm which periods are still within the audit window.
I built CAMAudit because this cross-reference check is exactly the kind of work that falls between the cracks in standard bookkeeping practice. The reconciliation gets coded and approved. The standalone invoice gets coded and approved. The lease sits in a file. Nobody compares the three. Our tool extracts the utility line items from the reconciliation and flags them against lease-defined included categories, surfacing the potential duplicate automatically so the accounting team has a documented finding rather than a vague sense that something looks off.