Last updated:
Every year, tenants across Germany receive an envelope from their landlord containing a document that can provoke immediate anxiety: the Nebenkostenabrechnung. For anyone who grew up outside Germany, the name alone is daunting. But behind the compound noun lies a straightforward concept: it is a yearly reconciliation of building operating costs, comparing what you actually owe against the monthly advance payments you have been making throughout the year.
The Nebenkostenabrechnung is regulated by German federal law. Your landlord can only charge specific, legally defined costs, must use a transparent calculation method, and must send the statement within a strict 12-month deadline. Understanding the rules protects you from overpaying and gives you the tools to challenge anything that does not look right.
Key takeaways
- The Nebenkostenabrechnung is the annual statement reconciling actual building operating costs (Betriebskosten) against the monthly advances (Vorauszahlungen) you paid during the year.
- Only costs listed in §2 of the Betriebskostenverordnung (BetrKV) can be charged to tenants. Repairs, mortgage interest, and management fees are explicitly not chargeable.
- The landlord must deliver the statement within 12 months of the billing period end. Miss the deadline, and they forfeit the right to demand extra payment, but you can still claim any refund owed.
- If you owe a top-up (Nachzahlung), you typically have 30 days to pay. If you overpaid, you receive a refund (Guthaben).
- You have the right to inspect all underlying invoices (Belegeinsicht). If the statement looks wrong, challenge it in writing within the deadline.
What is a Nebenkostenabrechnung?
A Nebenkostenabrechnung (also called Betriebskostenabrechnung) is the annual statement of ancillary costs that your landlord is required to send you if your rental contract includes a Vorauszahlung: a monthly advance payment for building operating costs. "Nebenkosten" translates literally as "ancillary costs" or "secondary costs." In the rental context, it covers the operating expenses of the building that the landlord passes on to tenants: things like water, heating, waste collection, building insurance, and garden maintenance.
During the year, you pay a monthly lump sum alongside your base rent. This advance is an estimate. At the end of each billing year, the landlord adds up all actual costs, works out your share using a legally defined allocation method, and compares the total to what you already paid. The Nebenkostenabrechnung is the document that records that comparison and tells you whether you owe more or are due a refund.
This is not an optional or informal document. It is a legal obligation governed by §556 of the Bürgerliches Gesetzbuch (BGB) and the Betriebskostenverordnung (BetrKV). Both the costs that can be included and the process for billing them are defined by statute. A landlord who charges costs not listed in BetrKV, or who misses the billing deadline, loses specific legal rights under that framework.
Key characteristics: what can and cannot be charged
The Betriebskostenverordnung (BetrKV) defines exactly which costs qualify as Betriebskosten and may therefore appear on your Nebenkostenabrechnung. Only costs that are ongoing, regular, and listed in §2 BetrKV are chargeable. One-off costs, structural repairs, and costs that benefit only the landlord cannot be passed on to tenants.
The table below lists the main cost categories you will encounter, whether each is chargeable, and the typical allocation method used to divide that cost among tenants in the building.
| Cost item | Chargeable? | Typical allocation method |
|---|---|---|
| Heating (Heizkosten) | Yes | At least 50% by actual consumption (meter reading); remainder by floor area. Governed by the separate Heizkostenverordnung. |
| Hot water (Warmwasser) | Yes | At least 50% by actual consumption; remainder by floor area. |
| Cold water and wastewater | Yes | By actual consumption (meter reading) or by floor area if no individual meters exist. |
| Building insurance (Gebäudeversicherung) | Yes | By floor area (Wohnfläche). |
| Waste collection (Müllabfuhr) | Yes | By number of units or by floor area. |
| Building cleaning (Hausreinigung) | Yes | By floor area or number of units. |
| Garden maintenance (Gartenpflege) | Yes: for communal areas | By floor area or number of units. |
| Stairwell and communal lighting | Yes | By floor area or number of units. |
| Lift maintenance (Aufzug) | Yes: operating costs only | By floor area; ground-floor tenants may be excluded depending on lease terms. |
| Caretaker / property manager on-site (Hausmeister) | Yes: service costs only, not administrative work | By floor area or number of units. |
| Street cleaning and winter road maintenance | Yes | By floor area or number of units. |
| Property tax (Grundsteuer) | Yes: if stated in the lease | By floor area. |
| Repairs and maintenance (Instandhaltung / Instandsetzung) | No | Landlord's cost. Not chargeable under BetrKV. |
| Mortgage interest and loan costs | No | Financing costs belong to the landlord exclusively. |
| Depreciation (Abschreibung) | No | An accounting cost, not an operating cost. Not chargeable. |
| Administrative fees (Verwaltungskosten) | No | Cost of managing the property is the landlord's. Not listed in BetrKV and not chargeable. |
| Vacancy costs (leerstandsbedingte Kosten) | No | Costs attributable to empty units must be absorbed by the landlord and cannot be redistributed to existing tenants. |
ℹ Info: A cost can only appear on your Nebenkostenabrechnung if two conditions are met: it must be listed in §2 BetrKV, and it must also be explicitly listed as chargeable in your rental contract (Mietvertrag). A cost that passes the BetrKV test but is absent from your contract cannot be billed to you.
The legal framework: §556 BGB and BetrKV
Two pieces of legislation govern everything about the Nebenkostenabrechnung. Together, they form a complete and mandatory framework that neither landlords nor tenants can contract away.
§556 BGB: the core obligation
Section 556 of the Bürgerliches Gesetzbuch (BGB) is the primary source of the rules on Betriebskosten in residential tenancy. It establishes three foundational principles. First, a landlord may only charge ancillary costs that have been explicitly agreed in the rental contract. Second, if monthly advances are charged, the landlord must produce an annual settlement statement: the Nebenkostenabrechnung. Third, the statement must be delivered within 12 months of the billing period's end. A late statement forfeits the landlord's right to claim any additional payment.
Betriebskostenverordnung (BetrKV): the catalogue of allowed costs
The Betriebskostenverordnung is a federal regulation that provides the exhaustive list of costs that qualify as Betriebskosten. It enumerates 17 categories in §2 BetrKV, covering everything from heating and water to building insurance and communal antenna systems. The list is exhaustive: a cost that does not appear in it is not a Betriebskosten and cannot be billed to the tenant under any circumstances.
The BetrKV also draws a clear line between ongoing operating costs (which are chargeable) and one-time capital costs, repairs, and financing expenses (which are not). This distinction is the most common source of disputes. Landlords who include repair invoices, loan repayments, or administrative fees in the statement are acting contrary to the regulation.
"A cost can only appear on your Nebenkostenabrechnung if it is listed in §2 BetrKV and explicitly named in your rental contract."
Heizkostenverordnung: the separate heating rules
Heating and hot water have their own regulation: the Heizkostenverordnung (HeizkV). This rule requires that at least 50% of heating costs be billed on the basis of individual consumption (using meter readings), with the remaining portion split by floor area. This prevents tenants who use little heating from subsidising heavy users. If your building has individual heat meters and your landlord allocates all heating costs by floor area, that is a breach of the HeizkV and you can request a correction.
How the calculation works
The Nebenkostenabrechnung follows a standard three-step structure. Once you understand the structure, the document becomes much easier to read and verify.
Step 1: Total actual costs for the billing period
The landlord collects all invoices for allowable operating costs incurred during the billing year (usually the calendar year: 1 January to 31 December). Each cost item is listed separately with the total amount paid for the whole building.
Step 2: Your share is calculated using an allocation key (Verteilerschlüssel)
The total cost for each line item is divided among all tenants using an allocation key. The most common keys are:
- Floor area (Wohnfläche): your apartment's size as a proportion of the total rentable floor area in the building. This is the most widely used key for most cost categories.
- Number of residential units (Wohneinheiten): a simple equal split between all apartments. Used for costs that do not vary by apartment size, such as waste collection in some buildings.
- Number of persons (Personenzahl): used occasionally for water costs in buildings without individual meters.
- Individual consumption (Verbrauch): mandatory for heating and hot water where meters exist (at least 50% weight, per HeizkV).
The allocation key used for each cost must be stated on the statement. If no key is stated, or if the landlord has switched to a less favourable key without your agreement, this is a formal defect you can challenge.
Step 3: Your advances are deducted
Once your share of each cost category has been calculated, the total is added up to give your actual Betriebskosten for the year. The landlord then deducts the total monthly advances you paid during the billing period. The resulting figure is either a top-up demand (Nachzahlung) or a credit (Guthaben).
💡 Tip: You can estimate your own share before the statement arrives. Divide your apartment's floor area by the total building floor area to get your percentage. Apply that percentage to last year's total costs from the previous statement. The result is a rough forecast of your liability and tells you whether your current monthly advance is roughly right.
The 12-month deadline rule
Under §556 Abs. 3 BGB, the landlord must deliver the Nebenkostenabrechnung to the tenant within 12 months of the end of the billing period. For a billing year that runs from 1 January 2025 to 31 December 2025, the deadline is 31 December 2026.
If the landlord misses this deadline, they lose the right to claim any additional payment (Nachzahlung) from you for that billing year. The deadline is strict: courts have consistently enforced it. A landlord who delivers a statement on 2 January 2027 for the 2025 billing year cannot demand a Nachzahlung, regardless of the size of the underpayment.
There is one important asymmetry in the rule. The deadline cuts off the landlord's right to demand more money from the tenant. It does not cut off the tenant's right to claim a refund. If the statement arrives late and shows a Guthaben (credit), you can still claim that money back.
⚠ Warning: The deadline only protects you if you did not cause the delay. If the landlord was unable to produce the statement on time because you failed to provide required information (such as meter readings), the protection may not apply. Always submit any requested readings promptly.
What happens next: Nachzahlung or Guthaben
Once you have received the statement, one of two outcomes applies.
You owe a top-up payment (Nachzahlung)
If your actual share of costs exceeded your advance payments, the statement will show a Nachzahlung: the amount you still owe for the billing year. German law does not set a universal statutory payment term for this demand, but the standard practice is 30 days from receipt of the statement. Check the statement itself: a reasonable payment deadline should be stated.
A large Nachzahlung often signals that your monthly advance was set too low. Once you have paid the outstanding amount, you have the right to request an increase in your monthly Vorauszahlung going forward, adjusted to a realistic level, under §560 Abs. 4 BGB. This prevents the same underpayment from building up again in the next billing year.
You are owed a refund (Guthaben)
If your advance payments exceeded your actual share, you have a credit. The landlord must pay this back. The standard expectation is repayment within 30 days of the statement date, although the BGB does not set an explicit deadline. If the landlord does not pay within a reasonable time, you can set a formal deadline in writing. After that deadline passes, you can deduct the Guthaben from your next monthly advance payment.
A consistent Guthaben year after year suggests your monthly advance is too high. You can request a downward adjustment under §560 Abs. 4 BGB. A lower Vorauszahlung improves your monthly cash flow.
How to check your statement
A well-prepared Nebenkostenabrechnung is a structured document. Checking it does not require legal training, but it does require methodical attention to each element. Work through the following points.
Check the billing period and delivery date
Confirm the billing period stated on the statement. Check the date on which it was delivered to you. If delivery was more than 12 months after the billing period end date, the Nachzahlung demand is void under §556 Abs. 3 BGB. Keep the envelope with its postmark as proof of delivery date.
Verify that each cost item is listed in your contract
Compare each cost item on the statement against the list of chargeable Nebenkosten in your rental contract. If a cost appears on the statement but is not named in your contract, it cannot be charged to you. Contact your landlord in writing to remove the item from the calculation.
Check for non-chargeable cost types
Look specifically for line items that resemble repairs, management fees, loan repayments, depreciation, or legal costs. None of these belong in a Nebenkostenabrechnung. If you see an item you do not recognise, request clarification. Do not pay a Nachzahlung that includes impermissible costs.
Verify the allocation key and your floor area
Check that the allocation key stated for each cost matches what your contract specifies. Confirm that the floor area used for your apartment is correct. Errors in floor area are common in older buildings where measurement standards have changed. Even a small discrepancy of a few square metres can result in a meaningful overcharge over a year.
Check the vacancy issue
If the building has empty units, the landlord must absorb the costs attributable to those units. They cannot redistribute vacant-unit costs among the remaining tenants. Check that the total units used in the floor-area denominator includes all units, not just occupied ones.
Exercise your right to inspect source documents (Belegeinsicht)
Under established case law, tenants have the right to inspect the original invoices, receipts, and contracts underlying the Nebenkostenabrechnung. This is called Belegeinsicht. You exercise this right by sending a written request to your landlord, specifying which documents you want to see. The inspection typically takes place at the landlord's office or premises. You may make copies. If the landlord refuses to provide Belegeinsicht, this is a strong ground for challenging the statement in full.
💡 Tip: If you believe the statement contains errors, send your objection by registered mail (Einschreiben mit Rückschein) within the deadline stated on the statement. State each specific error clearly. If the total Nachzahlung is in dispute, pay the undisputed portion by the deadline to avoid default interest and protect your tenancy.
Contact a Mieterverein for complex disputes
If the statement is large, contains multiple questionable items, or if your landlord is unresponsive, contact a local Mieterverein (tenants' association). Annual membership costs between 70 EUR and 120 EUR in most cities and includes access to qualified legal advisors who review Nebenkostenabrechnungen regularly. They can identify errors that a non-specialist might miss and draft formal objection letters on your behalf.
FAQs about the Nebenkostenabrechnung
What should I do if I think my Nebenkostenabrechnung is wrong?
You have the right to inspect the underlying invoices and receipts (Belegeinsicht) at the landlord's premises. Request this in writing. If you find errors, challenge them formally in writing before the statement's payment deadline. State each specific error clearly: for example, a non-chargeable cost type, an incorrect floor area, or a missing vacancy deduction. Pay the undisputed portion of any Nachzahlung by the deadline to avoid default interest. For complex disputes, contact a Mieterverein: membership typically costs 70–120 EUR per year and includes professional legal advice.
Can my landlord charge for repairs in the Nebenkostenabrechnung?
No. Repair and maintenance costs (Instandhaltungskosten and Instandsetzungskosten) are the landlord's responsibility and cannot be passed on to tenants via the Nebenkostenabrechnung. Only the ongoing operating costs explicitly listed in §2 BetrKV are chargeable. If you see a line item that looks like a repair: a plumber's invoice, a roof repair, replacement of a boiler: challenge it in writing. The cost must be removed from the calculation and your share recalculated accordingly.
What is the deadline for a Nebenkostenabrechnung?
The landlord must deliver the Nebenkostenabrechnung within 12 months of the end of the billing period under §556 Abs. 3 BGB. For a billing year running from 1 January to 31 December 2025, the deadline is 31 December 2026. If the landlord misses this deadline, they lose the right to claim any additional payment (Nachzahlung) from you for that billing year. However, if the statement shows you are owed a refund (Guthaben), you can still claim it even after the deadline has passed.
What is the difference between warm rent and cold rent?
Cold rent (Kaltmiete) is the base rent for the apartment itself, covering only the living space and no utilities or service charges. Warm rent (Warmmiete) is the total monthly payment: Kaltmiete plus the monthly Nebenkosten advance (Vorauszahlung), which covers heating, water, waste disposal, building insurance, and other allowed operating costs. The Nebenkostenabrechnung reconciles that Vorauszahlung against the actual costs at the end of the year. The security deposit (Kaution) is calculated on Kaltmiete only, not on Warmmiete: so the distinction matters financially from day one of your tenancy.
What happens if I receive a Nachzahlung demand I cannot afford to pay?
Contact your landlord in writing as soon as possible. While German law does not set a statutory right to instalment payment for a Nachzahlung, many landlords will agree to a payment plan if approached promptly and in good faith. First, verify that the statement is correct by exercising your right to Belegeinsicht. If you believe the demand is partly or wholly wrong, withhold only the disputed portion while paying the undisputed amount on time. Failure to pay an undisputed Nachzahlung can give the landlord grounds for termination if the unpaid amount reaches a material threshold under §543 BGB. A Mieterverein can advise you on the best course of action.
Sources
- §556 BGB: Vereinbarungen über Betriebskosten (obligations for ancillary cost statements). gesetze-im-internet.de
- Betriebskostenverordnung (BetrKV) §2: Catalogue of allowable Betriebskosten. gesetze-im-internet.de
- Heizkostenverordnung (HeizkV): Rules on consumption-based billing of heating and hot water costs. gesetze-im-internet.de
- §560 BGB: Änderung der Betriebskosten (adjustment of ancillary cost advances). gesetze-im-internet.de
- Deutscher Mieterbund: Betriebskosten und Nebenkostenabrechnung: tenant rights and the annual statement explained. mieterbund.de
- Stiftung Warentest: Nebenkostenabrechnung: how to read and check the statement. test.de
- IamExpat Germany: Service charges in Germany: what tenants need to know. iamexpat.de