Enter costs, areas and advance payments to calculate the operating-cost share, monthly advance payment and additional payment or credit.
Model one floor-area allocation
Enter the allocable total, apartment area, total allocation area, and advance payments for the same billing period. The calculator applies one area ratio.
Read the settlement difference
The annual share is compared with advance payments. A positive difference is shown as an additional payment; a negative difference is shown as a credit.
German Civil Code section 556 governs key billing and objection rules. Compare the real statement, contract, keys, readings, and documents rather than relying on this arithmetic alone.
Frequently Asked Questions
Which operating costs can be allocated?
German Civil Code section 556 ties operating-cost allocation to an agreement and the operating-cost rules. Check every cost category and the tenancy agreement; this calculator accepts only a user-entered total.
How does an allocation key work?
A key distributes a total among units. This model uses only apartment floor area divided by total allocation area, even if the real statement uses other or mixed keys.
How is an additional payment or credit calculated?
The modeled annual share minus advance payments gives a positive additional payment or a negative credit. This arithmetic does not prove that the statement is legally correct.
How are heating costs allocated?
German Heating Cost Ordinance section 7 generally requires a consumption-based portion. The floor-area-only model here does not reproduce that split.
Which deadlines apply to the statement?
Civil Code section 556 generally requires an annual statement within twelve months after the billing period and sets a twelve-month tenant objection period after receipt, subject to the statutory exceptions.
When should I request documents or advice?
Request supporting documents if cost items, keys, readings, periods, or advance payments are unclear. Seek qualified advice when deadlines, larger amounts, or formal disputes matter.
