Franchise CAM Estimates vs. Actual Charges: Why the Gap Matters
Every franchise operator on a NNN lease pays two different numbers for CAM: what the landlord estimates at the beginning of the year, and what the landlord bills at the end of the year after actual expenses are tallied. For most operators, these numbers are different every year. Sometimes the difference is modest. Sometimes it is not.
Understanding why the gap exists, when it is normal, and when it is a signal of a deeper problem is part of managing occupancy cost effectively.
How Monthly Estimates Are Set
At the start of each lease year (or at the time of lease commencement), the landlord sets a monthly CAM estimate based on a projection of expected annual expenses. The process varies:
Budget-based estimates: The property manager builds an annual operating budget, divides total projected costs among tenants by pro-rata share, and sets monthly estimates accordingly. This is the most straightforward approach.
Prior-year based estimates: The landlord takes last year's actual expenses, adjusts upward by a flat percentage (often 3% to 5%), and uses that as the projection. Simple, but it ignores meaningful changes in actual costs.
Static estimates: Some landlords leave estimates unchanged for years at a time. When actual expenses grow year over year but estimates stay flat, the true-up balance due grows steadily. By Year 4 or 5 of a static estimate, the annual true-up can be substantial.
The estimate has no direct obligation to be accurate. Most leases allow the landlord wide discretion in setting and adjusting estimates. What matters for the tenant is the actual expense calculation — that must comply with the lease.
The Normal Range of Gap
Some gap between estimated and actual CAM is expected. Operating expenses fluctuate. Weather drives snow removal costs up or down. Vendor contracts change. A modest true-up — within 10% to 15% of the annual estimate total — is typical and not inherently a problem.
Example of a reasonable gap: Tenant pays $720/month in CAM estimates ($8,640/year). Actual annual share at reconciliation: $9,200. True-up balance due: $560. Gap: 6.5%. This is normal.
What becomes worth examining is a persistent large gap in one direction, or a sudden large increase that does not align with obvious cost drivers.
What Causes Large Gaps
Conservative (Low) Estimates Designed to Close Deals
Landlords sometimes set below-market estimates during lease negotiations to reduce apparent monthly cost. The tenant sees a lower number at signing, which makes the deal look more attractive. The reconciliation the following year reveals the real cost.
This is not fraud — it is negotiating strategy, and it is common. But it creates cash flow issues for operators who budgeted based on the lease estimate rather than a realistic occupancy cost projection.
How to identify it: Before signing, ask the landlord for actual operating expenses from the prior two to three years. Compare the proposed estimate to what those years would have produced. A significant gap between historical actuals and the proposed estimate is a signal.
Actual Expenses Grew Faster Than Projected
Legitimate cost increases — particularly in taxes (after a property reassessment), insurance, or maintenance contracts — can produce a true-up that reflects real expense growth rather than an error. This is the most common source of genuine true-up balances.
The relevant question is whether the actual expenses are calculated correctly and whether any increases are within the limits your lease permits (e.g., whether a CAM cap applies to the controllable portion of the increase).
Improperly Included Expenses in the Actual Pool
A large true-up can also reflect billing errors in the actual expense calculation: capital items included in operating costs, management fees exceeding the lease cap, expenses from other properties allocated to yours. In this case, the gap is not a legitimate true-up — it is an overcharge presented as a true-up.
This distinction matters because the tenant is often conditioned to view true-up balances as valid adjustments they simply owe. If the actual expense pool contains errors, paying the balance due without verification means paying for the error.
What a Persistent Pattern of Underestimation Signals
If your estimates are consistently 20%, 30%, or 40% below actual charges year after year, ask why the landlord is not adjusting estimates upward to reflect reality.
There are a few possibilities:
Administrative inertia: The property manager simply has not updated estimates and the reconciliation process catches up each year. Neutral on its own, but it means your occupancy cost is harder to forecast.
Strategic low estimates: Keeping estimates low keeps tenants from feeling the full weight of occupancy cost month-to-month. The annual true-up arrives after the lease is in effect and is harder to dispute. This is a recognized practice in commercial property management.
Growing expense pool that may warrant scrutiny: If estimates are not keeping pace with actuals because actual expenses are growing unusually fast, the growth itself may be worth examining. Are the expense increases driven by legitimate cost trends, or by items that should not be in the pool?
A persistent gap is not itself proof of an error. But it is a reason to look at the actual expense detail more carefully.
Can a Landlord Change Estimates Mid-Year?
Most leases allow the landlord to adjust monthly estimates during the year if actual expenses are running significantly above projection. The mechanism is usually a written notice with a revised estimate schedule.
If your estimates increase mid-year, ask for the basis. A property manager who raises estimates by 30% mid-year without explanation may have encountered a genuine cost spike (a HVAC failure, a property tax reassessment, a large repair), or may be correcting a pattern of chronic underestimation.
You generally cannot refuse to pay a revised estimate if the lease authorizes the landlord to adjust it. But you can — and should — verify that the actual expense reconciliation at year end reflects legitimate charges.
Building a Tracking System for Your Locations
For franchise operators with multiple locations, tracking estimates vs. actuals across the portfolio produces useful pattern data:
| Location | Lease Year | Monthly Estimate | Actual Annual Share | True-Up | Gap % |
|---|---|---|---|---|---|
| Location A | 2024 | $840/mo ($10,080) | $11,340 | $1,260 | 12.5% |
| Location B | 2024 | $620/mo ($7,440) | $10,100 | $2,660 | 35.8% |
| Location C | 2024 | $950/mo ($11,400) | $11,820 | $420 | 3.7% |
Location B's 35.8% gap is the one worth examining. Either the estimate was set significantly below realistic costs, or the actual expense pool contains items worth verifying.
If you want to verify specific numbers from a reconciliation, the CAM overcharge estimator and pro-rata share calculator can run the core math against your lease terms and flag where the numbers diverge.
What to Do When You Receive a Large True-Up
If the year-end reconciliation shows a large balance due:
Verify the math. Confirm your pro-rata share percentage matches the lease. Confirm total expenses × your share = your gross charge.
Review the expense pool. Ask for line-item detail if the reconciliation is summary-only. Look for capital items, excess management fees, or charges from other properties.
Check the estimate credit. Confirm that all payments you made during the year are credited correctly.
Note your dispute window. The clock starts when you receive the reconciliation, not when the balance is due. If you need time to review, request the backup documentation promptly.
Pay what you can verify and flag what you cannot. A written response indicating you are reviewing specific line items before making full payment is a standard practice in commercial tenant reconciliation disputes.
Frequently Asked Questions
Why do CAM estimates differ from actual charges?
CAM estimates are projections set before the year begins. Actual charges reflect expenses the landlord incurred during the year. Differences arise from genuine expense fluctuations, estimates that were set conservatively or inaccurately, or from actual expense pools that contain billing errors. A modest gap is normal; a large or persistent gap warrants a closer look.
Can a landlord change CAM estimates mid-year?
Most leases allow the landlord to adjust monthly estimates during the year if expenses are running significantly above projection. The adjustment is typically communicated in writing. You cannot usually refuse a lease-authorized adjustment, but you can request the basis for the increase.
What is the true-up process for CAM estimates?
At the end of the lease year, the landlord calculates actual operating expenses and compares your actual share to your estimated payments. If you overpaid, you receive a credit or refund. If you underpaid, the difference is a balance due. This reconciliation process is the true-up.
How do I track whether my CAM estimates are accurate?
Record your annual estimate total and annual actual share for each location. Calculate the gap as a percentage of the estimate. A gap consistently above 15% to 20% in either direction is worth examining. For multi-location operators, a simple spreadsheet tracking this by location and year makes year-to-year patterns visible.