How do utilities end up billed twice in a commercial lease?

In most triple-net leases, common area utility costs (lobby lighting, elevator power, parking lot lights, HVAC for shared spaces) are pooled into the CAM operating expense total. The landlord then allocates them via the annual reconciliation. Sometimes landlords also invoice tenants separately for specific utility items, either as a direct charge for the tenant's suite or as a separate pass-through. When a cost belongs in the CAM pool and is also billed separately, the tenant is paying for it twice.

What does a duplicate utility charge look like in the general ledger?

A duplicate utility charge typically shows up as two entries coded to the same account or to accounts that describe the same cost: one from the annual CAM reconciliation or monthly estimated payment, and one from a separate landlord invoice. The description may differ slightly ("common area electricity" in the reconciliation, "building electric charge" on the standalone invoice), which is why they are easy to miss without a side-by-side comparison.

How much does a duplicate utility charge typically cost a tenant?

The dollar impact depends on the utility type, the building size, and how costs are allocated. Common area electricity and HVAC are the most frequent duplicate items. In a mid-size office building, a tenant paying for both a CAM-allocated share of common area electricity and a separate monthly electricity charge might be overpaying by $1,500 to $3,000 per year depending on their pro-rata share and the building's usage patterns. The overcharge is recoverable if it falls within the audit window.

Does the lease tell you whether utilities should be in the CAM pool?

Yes. The lease defines what is included in operating expenses or the CAM pool, and whether utilities are part of that definition. Leases often list "common area utilities" as an included expense category. If the lease also has a direct utility charge provision, it should specify that the direct charge covers only the tenant's suite, not common areas. When both provisions exist and the scope overlaps, the tenant is likely being charged twice for the same cost category.

What should I do when I find a duplicate utility charge?

Document both billing instances: the CAM reconciliation line showing the utility allocation and the standalone invoice. Identify the specific utility type and the period covered. Then compare the scope of each charge against the lease to confirm they describe the same cost. Calculate the annual overcharge. Raise the dispute in writing to the landlord before the audit window closes. The landlord will typically issue a credit memo or adjust the next reconciliation.

How to Spot a Duplicate Utility Charge in CAM Statements

Utility charges are one of the most confusing parts of commercial lease billing. They show up in many places, under different names, on different schedules. Say a bookkeeper codes each invoice as it arrives. They never check it against the CAM reconciliation. At some point, they will approve a double charge. CAM means common area maintenance, the shared costs a tenant helps pay. Reconciliation is the year-end true-up of those costs. For more, see CAM red flags accounting firms should know.

The double charge is rarely on purpose. It often comes from how landlord billing systems work. But the tenant pays the same cost twice either way. The recovery is simple once you document the duplicate.

Here is how these duplicates happen. Here are the steps to catch them.

Why utilities end up in two places

In a typical NNN lease, the CAM pool holds common area operating costs. NNN means the tenant pays its share of operating costs. That pool usually covers common area utilities. Think lobby and hallway lights, elevator power, shared HVAC power, and parking lot lights. Each tenant gets a share through the annual reconciliation, based on pro-rata share. Pro-rata share is the tenant's slice of shared costs.

The same building might also bill some tenants directly. A dental office in a medical building might get its own HVAC invoice. That use sits on its own meter. A retail tenant might get a monthly charge for its sign lighting. That one comes as a direct pass-through.

Sometimes the CAM pool share and the direct invoice cover the same use. Then the tenant pays twice. The reconciliation gives them a share of building power. The separate invoice bills them for building power again, under a different line name.

The two amounts are usually not equal, because the billing methods differ. That is why the duplicate hides so well. The invoices look different, but the cost behind them is the same.

What a duplicate looks like in the GL

When both charges are coded and posted, the general ledger shows two entries.

A CAM cost entry, coded to occupancy or rent expense. It comes from the monthly estimate or the year-end true-up.
A separate utilities entry, coded to utilities or facilities. It comes from the standalone landlord invoice.

The bookkeeper may use different accounts for the two. Then the charges sit far apart in the expense report. The occupancy bucket holds the CAM share. The utilities bucket holds the direct charge. No one checks both against what the lease says is in the CAM pool.

For a 3-location retailer, this means three double charges at once. Each one sits in a different account. None look related without a cross-check.

The cross-reference check

The check that catches duplicates is simple. Compare each standalone utility invoice against the CAM reconciliation lines for the same period.

Start with the CAM reconciliation. Find the utility lines in the building cost total. They might say "Common Area Electric," "Utilities," "HVAC Operating Cost," or the like. Note the category and the period.

Then pull the standalone utility invoices for that same period. The client got them from the landlord. Note what they say.

Now ask one question. Could this standalone invoice cover a cost already in the CAM pool share? Say the pool has "Common Area Electric." The invoice says "Building Electrical Charge." You may have a duplicate. Go to the lease to confirm.

Reading the lease for utility scope

The lease should tell you two things.

First, what is in the CAM pool. The operating expense list or CAM pool list should name the included items. Utilities or common area utilities may be on the list. If so, they should flow through the reconciliation.

Second, what is billed directly. If the lease has a separate utility clause, it should state the scope. Here is a sample clause. "Tenant shall pay directly to Landlord a monthly charge for electricity consumed within the Premises." That means in-suite use, not a common area share. The scope stops at the Premises. So it should not overlap the common area share in the CAM pool.

The lease may have both clauses with each scope clear. Suite is direct. Common area runs through reconciliation. Then there is no duplicate. But the direct charge scope may be vague or overlap the CAM pool. Then you have a contract issue. Raise it with the landlord.

Dollar impact: what to expect

The size of a duplicate utility charge depends on a few things. They are the building type, the tenant size, and which utility doubles up.

In a mid-size office, common area electricity might run $40,000 to $80,000 a year. A 10% pro-rata share would cost the tenant $4,000 to $8,000 of that. That payment comes through the reconciliation. They may also get a separate "building electric" invoice for the same cost. Then the double exposure sits in the same range.

For office and retail tenants, our tool flags this often. The yearly range is $1,500 to $3,000. The higher cases involve larger tenants or high-use buildings like medical or fitness sites.

The year-over-year pattern

Duplicate charges are often not a one-year problem. The standalone invoice may have run since lease start. The CAM pool may have held the same utility all along. Then the duplicate goes back to the start of the billing.

So the audit window matters. Most leases give 12 to 24 months to dispute the CAM share. The clock starts at the reconciliation delivery date. The standalone invoices may have a shorter path. But the CAM audit right may cover them too. Then every year inside the window is recoverable.

Controllers should figure the yearly overcharge. Then multiply it by the years inside the audit window. A $900 yearly problem may turn into a $2,700 claim over three years.

What to document before raising the dispute

Before you contact the landlord, the bookkeeper should have four things.

First, both billing records. You need the CAM reconciliation lines for the utility category. You need the standalone invoices for the same category and period.

Second, the lease clause. You need the operating expense list that puts utilities in the CAM pool. You need the direct utility clause too, if there is one.

Third, the figured overcharge. You need the dollar amount per year. You need the total for all years inside the audit window.

Fourth, the delivery date of each reconciliation. You need it to confirm which periods are still inside the window.

I built CAMAudit because this cross-check slips through the cracks. The reconciliation gets coded and approved. The standalone invoice gets coded and approved. The lease sits in a file. No one compares the three. Our tool pulls the utility lines from the reconciliation. It checks them against the lease-defined included items. It surfaces the likely duplicate for you. The accounting team gets a documented finding. No more vague sense that something looks off.

How to Spot a Duplicate Utility Charge in CAM Statements