Expense caps are one of the most misunderstood provisions in a commercial lease. The concept is simple: the cap limits how much operating expenses can rise from one year to the next. But how it’s written can make a significant difference.
There are three common structures for expense caps, and the one in your lease decides who absorbs rising costs — the tenant or the landlord. The same 5% cap, three very different outcomes.
What an Expense Cap Actually Limits
An expense cap limits how much operating expenses can increase year over year. But it usually applies only to controllable expenses — things like janitorial, maintenance, and management fees.
It typically does not apply to non-controllable expenses — often defined as property taxes, insurance, and utilities — which pass through in full regardless of any cap. That’s important to understand up front, because some of the largest increases often come from the uncapped category.
Three Common Types
There are three structures you’ll commonly see: non-cumulative, cumulative non-compounding, and cumulative compounding. The difference between them is real.
The examples below all use the same setup: a 5% cap, with $10 of operating expenses in year one.
Non-Cumulative: Resets Every Year
With a non-cumulative cap, the maximum that can be passed through in any year is the prior year’s actual expenses plus the cap. Year one is $10, so the year-two ceiling is $10.50.
- If actual expenses come in at $10.70, the landlord can only pass through $10.50 and absorbs the $0.20 over the cap.
- If actual expenses come in at $10.20 — below the cap — the tenant pays $10.20, and the $0.30 of unused room is gone forever. The landlord can’t recover it in a future year.
Because each year resets off the prior year’s actual expenses, the ceiling follows costs back down when they fall. This is the most tenant-favorable structure.
Cumulative, Non-Compounding: The Cap Increases Every Year
With a cumulative cap, the landlord banks the unused increases. The ceiling rises by a fixed amount every year — 5% of the original $10, or $0.50 — no matter what actual expenses do. Because it’s non-compounding, the 5% is always calculated on the original base, so it’s a flat $0.50 a year: $10.50 in year 1, then $11.00 in year 2, $11.50 in year 3, $12.00 in year 4, and so on.
Even if actual expenses stay below the ceiling, the cap keeps climbing. That banked room means a later spike in expenses can be passed through, up to the accumulated cap.
Cumulative, Compounding: The Cap Builds on Itself
This works just like the cumulative cap, except the 5% is applied to the most recent ceiling rather than the original base — so it compounds. Year two is $10.50, year three is $11.03 (5% on $10.50), year four is $11.58, and it keeps accelerating.
The ceiling rises faster each year, regardless of actual expenses. This is the most landlord-favorable structure. The two cumulative caps start the same and diverge over time:
Year | Cumulative, Non-Compounding | Cumulative, Compounding |
|---|---|---|
1 (base) | $10.00 | $10.00 |
2 | $10.50 | $10.50 |
3 | $11.00 | $11.03 |
4 | $11.50 | $11.58 |
5 | $12.00 | $12.16 |
Why It Matters: Sudden Spikes in Expenses
Let’s put real numbers to it. Suppose expenses stay relatively flat — $10.00 in year one, then $10.10 in year two, then $10.20 in year three — and then jump to $11.50 in year four.
- Cumulative compounding: the year-four ceiling has already climbed to about $11.58, so the landlord can pass through the entire $11.50.
- Non-cumulative: the year-four ceiling resets off the prior actual ($10.20 + 5% = $10.71), so the landlord passes through $10.71 and absorbs the remaining $0.79.
Who Wants What
Lined up from most tenant-friendly to most landlord-friendly:
- Most favorable to tenants: non-cumulative.
- In the middle: cumulative, non-compounding.
- Most favorable to landlords: cumulative, compounding.
Tenants push for non-cumulative to protect against rising costs. Landlords push for cumulative to hedge against inflation. Neither is “right” — it’s a negotiated point.
The Bottom Line
An expense cap is a small clause that behaves very differently depending on a few words.
Over a long-term lease, the gap between non-cumulative and cumulative compounding can add up.
The takeaway for both sides is the same: know exactly which version is in the lease — and what it actually does — before signing.