The Most Common Errors in Commercial Operating-Cost Statements

The essentials at a glance

The eight most common errors this article walks through in detail – every single one can change your statement by a noticeable amount:

1. Cost types that were never agreed – only what the contract expressly names can be passed on
2. Management and maintenance costs without a valid clause
3. Repairs disguised as "maintenance" and passed on to you
4. A wrong apportionment key or one that deviates from the contract
5. Vacancy passed on to the remaining tenants
6. Arithmetic errors and missing credit for your advance payments
7. Missing formal components and refused access to documents
8. The deadline misconception – residential rules (12-month cut-off) do not apply to commercial leases

Why checking pays off for you

Unlike a residential lease, a commercial lease offers barely any statutory protection: the catalogue of the Operating Costs Ordinance (Betriebskostenverordnung, BetrKV) is not binding for commercial premises, and the consumer-protection rules of § 556 BGB deliberately do not apply here. What you bear is determined almost exclusively by your lease. That is precisely why statement errors are common – and worth checking. Below are the typical errors, each with a note on how to spot it and what you can do. ^3,6,7

Error 1: Cost types that were never agreed

In commercial tenancy law, the rule is: without a contractual agreement, the landlord bears the operating costs itself. Only cost types that are apportioned to you with sufficient specificity in the lease may be billed. A blanket reference to "all ancillary costs" is often not enough for individual items that are not self-explanatory. ³

• How to spot it: place the statement and the lease side by side. Every billed item must be attributable to a cost type named in the contract. Items such as "centre management", "security service" or "marketing" with no contractual basis are a warning sign.
• What to do: object to the item in writing and demand a reduction by the amount that was not agreed.

Error 2: Management and maintenance costs without a valid clause

Management costs and maintenance/repair are not part of the operating-cost catalogue of § 2 BetrKV. In commercial leases they may nevertheless be apportioned – but only with an express contractual clause. For management costs, the BGH ruled that a standard-form clause is valid even without a monetary cap. For maintenance and repair costs, the opposite applies: a standard-form clause that passes these costs on to you without a cost cap is invalid. ^2,8,9

• How to spot it: check whether a maintenance/repair clause contains a ceiling (usually as a percentage of the annual rent). If the cap is missing, the standard-form apportionment is generally invalid.
• What to do: if the cap is missing, reject the entire item – the invalidity of the clause means you do not owe these costs. ⁹

Error 3: Repairs disguised as "maintenance"

Even with a valid apportionment clause, genuine repairs (fixing or replacing defective equipment) are often mixed into the ongoing operating or maintenance costs. Operating costs, however, are only the costs that arise on a recurring basis – a one-off roof repair or a compressor replacement does not belong there. ²

• How to spot it: watch for unusually high individual amounts, tradesmen's invoices with a replacement/repair character, or items that did not exist in the previous year.
• What to do: inspect the supporting documents and have one-off repair costs removed from the statement.

Error 4: A wrong apportionment key or one that deviates from the contract

The apportionment key (Umlageschlüssel) determines your share. Errors arise when the landlord uses a key other than the one agreed in the contract or when the underlying areas are incorrect.

• How to spot it: compare the key stated in the statement with the lease. Check your rented area and the total area used, and recalculate your share yourself (your area ÷ total area).
• What to do: if the key deviates or the areas are incorrect, demand a recalculation based on the contractually agreed measure.

Error 5: Vacancy passed on to you

If a unit in the property is vacant, some landlords try to distribute the full costs among the remaining tenants. Under a floor-area key, however, the vacant area must remain part of the total area; the share attributable to the vacancy is borne, in principle, by the landlord, because vacancy is its risk. In commercial leases, though, the specific apportionment agreement is decisive – check your contract. ¹⁰

• How to spot it: check whether the total area in the statement corresponds to the actual total area – or whether vacant units have been "netted out" so that your share increases.
• What to do: demand that the full total area be applied and reduce your share accordingly.

Error 6: Arithmetic errors and missing advance-payment credit

Classics are simple arithmetic errors, incorrect totals and – especially costly – advance payments that are not credited, or credited incorrectly. Your monthly advance payments must be deducted from the overall result. ¹

• How to spot it: add up the advance payments you actually made during the billing period and compare them with the amount applied. Check the final total by recalculating.
• What to do: name the discrepancies specifically and request a corrected statement.

Error 7: Missing formal components and refused documents

A statement must meet the requirements of § 259 BGB: an ordered compilation of the costs and – where customary – the presentation of the supporting documents. Formally, this regularly includes: a compilation of the total costs, the statement and explanation of the apportionment key, the calculation of your share, and the deduction of your advance payments. ¹

• How to spot it: if one of these components is missing or your share is not derived in a comprehensible way, the statement is open to challenge. You have a right to inspect the supporting documents.
• What to do: request document inspection in writing; until it is granted, you can generally withhold an additional payment.

Error 8: The deadline misconception – residential rules do not apply here

A common misconception on both sides: for residential premises, the statement must be issued within twelve months, otherwise additional claims are excluded (§ 556 para. 3 BGB). This cut-off period does not apply to commercial leases – the BGH has expressly rejected an analogous application. A late statement is therefore not automatically invalid. Conversely, however, the statutory exclusion of objections to your detriment does not apply here either. The limit remains the standard three-year limitation period (§§ 195, 199 BGB). ^5,6,4,11

• How to spot it: do not rely on the argument that a statement is "too late" and therefore void – instead, check the limitation period (statements older than roughly three years).
• What to do: for very old additional claims, check the limitation period; otherwise review the substance rather than counting on the deadline.

Error → Check (quick overview). ^1,2,6,8,9

Do you run a restaurant, café or bakery? The anomalies Boomerent makes visible in food-service leases and tenancy agreements are covered on lease and service-charge analysis for food service.

Free checklist: Audit your commercial service-charge statement in 8 steps yourself — against exactly the errors in this article, with sections and case references. Get the audit checklist.