Operating Cost Statements: 7 Common Mistakes to Avoid
Key takeaways
- The statement must reach the tenant within 12 months of the accounting period's end – otherwise an additional claim is usually forfeited.
- Only allocable operating costs may be distributed; administration, maintenance and repairs do not qualify.
- Vacancy is borne by the owner, not the remaining tenants.
- A formally incomplete statement is invalid – regardless of whether the figures are correct.
- Central master data and receipts reduce transfer errors and surface deadlines in time.
The annual operating cost statement (Betriebskostenabrechnung) is one of the most common sources of dispute between tenants and management in Germany. Many objections are not about the figures but about form – and are therefore avoidable. Knowing the typical pitfalls saves you corrections, repayments and friction. This guide covers the seven most common mistakes, the rules behind them, and a checklist for a formally clean statement.
Allocable or not? The rule of thumb first
Before the mistakes, the key distinction: only running operating costs as defined by the Operating Costs Ordinance (BetrKV) may be passed on to tenants. One-off costs, administration and repairs stay with the owner.
| Allocable (selection) | Not allocable |
|---|---|
| Property tax | Administration costs |
| Water and wastewater | Maintenance and repairs |
| Heating and hot water | Maintenance reserve |
| Waste collection and street cleaning | Management's bank fees |
| Building cleaning and gardening | Cost of vacancy |
| Lift, lighting of common areas | Repair of individual appliances |
| Building and liability insurance | Lawyer and dunning costs |
| Caretaker | Purchase of new equipment |
Holding this line already in your bookkeeping prevents most of the following mistakes from the start.
1. Missing the settlement deadline
The statement reconciling advance payments must reach the tenant no later than the end of the twelfth month after the accounting period ends (§ 556(3) BGB). Miss that deadline and, as a rule, the landlord can no longer claim an additional payment – while a tenant's credit balance still stands. With many units, it is easy to lose track. A central system that tracks each property's accounting period and reminds you in time prevents the most expensive mistake of all.
2. Charging non-allocable costs
A classic error: the cost of property management itself, or repairing a heating system, slips into the statement. Neither is allocable. Stick to the table above and separate allocable from non-allocable items at the point of booking – not when you assemble the statement.
3. Wrong or inconsistent allocation key
The allocation key must be transparent and contract-compliant. Consumption-based costs such as heating and hot water are governed by the Heating Costs Ordinance. Other costs – unless otherwise agreed – are distributed by floor area (§ 556a BGB). Switching the key from year to year without good reason makes the statement challengeable.
4. Passing vacancy costs onto tenants
When a unit stands empty, the owner bears the proportional operating costs – not the other tenants. If vacancy is not deducted, the remaining parties pay too much. This surfaces at the latest during document review and leads to justified reductions.
5. Obstructing access to receipts
Tenants have the right to inspect the underlying invoices. Failing to archive original receipts properly, or delaying access, weakens your position. A digital document store where every invoice is linked to the property and accounting period turns receipt inspection into a formality.
6. Arithmetic errors and outdated area figures
A surprisingly common error is simply wrong square-meter figures. If a flat was remodeled or an area re-measured, that must flow into the allocation key. Manual transfers into spreadsheets are especially error-prone – every number copied by hand is a potential mistake.
7. Incomplete formal details
A proper statement contains the accounting period, total costs, the allocation key, the tenant's share, and the offset against advance payments. If any of these is missing, the statement is formally invalid – regardless of whether the numbers are correct.
Checklist: a formally correct statement
- accounting period clearly stated (usually twelve months)
- receipt by the tenant within the one-year deadline ensured
- total costs shown per cost type
- only allocable items included
- allocation key stated and transparent
- vacancy shares deducted
- tenant's share and offset against advance payments shown
- receipts fully archived and attributable
How software prevents these mistakes
Most of these errors stem not from ignorance but from manual work and a lack of overview across many properties. A central platform that keeps master data, areas, contracts and receipts in one place reduces transfer errors and makes deadlines visible.
That is exactly what Immo Manager is built for: properties, units and contracts are linked, documents are stored against the relevant property, and you keep every accounting period in view. Learn more on our property management software page.
Note: This article offers general orientation and is not legal advice. For individual cases, clarify tenancy-law questions with a qualified professional.
Frequently asked questions
By when must the operating cost statement reach the tenant?
No later than the end of the twelfth month after the accounting period ends (§ 556(3) BGB). If it arrives later, the landlord can generally no longer enforce an additional claim – unless the delay was not the landlord's fault.
Which costs may not be passed on to tenants?
Administration, maintenance and repair costs, as well as reserves, are not allocable. Only the running operating costs defined by the Operating Costs Ordinance (BetrKV) may be passed on.
How long can the tenant object to the statement?
The tenant has twelve months after receiving the statement to raise formal or substantive objections (§ 556(3) BGB).
Who bears the operating costs during vacancy?
The owner bears the operating costs attributable to a vacant unit. They may not be distributed among the other tenants.
Which allocation key applies if nothing was agreed?
Without a differing agreement, costs are allocated by floor area (§ 556a BGB). Heating and hot-water costs fall under the Heating Costs Ordinance and are largely billed by consumption.