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CO₂ cost calculator: splitting between landlord and tenant
For billing periods from 1 January 2023, landlords and tenants in Germany share the carbon cost of heating and hot water according to a ten-step model (§ 5 CO2KostAufG). The more CO₂ the building emits per square metre, the larger the landlord's share.
Figures from the fuel bill
Printed on the fuel supplier's bill (§ 3 CO2KostAufG).
Also shown on the bill. Without an amount the calculator shows the shares only.
Result
Enter the CO₂ emitted and the living area.
The ten steps (annex to the CO2KostAufG)
| Step | kg CO₂ / m² / year | Landlord | Tenant |
|---|---|---|---|
| 1 | 0 to under 12 | 0 % | 100 % |
| 2 | 12 to under 17 | 10 % | 90 % |
| 3 | 17 to under 22 | 20 % | 80 % |
| 4 | 22 to under 27 | 30 % | 70 % |
| 5 | 27 to under 32 | 40 % | 60 % |
| 6 | 32 to under 37 | 50 % | 50 % |
| 7 | 37 to under 42 | 60 % | 40 % |
| 8 | 42 to under 47 | 70 % | 30 % |
| 9 | 47 to under 52 | 80 % | 20 % |
| 10 | 52 and above | 95 % | 5 % |
- The step model applies to residential buildings. For non-residential buildings the cost is generally split half and half (§ 8 CO2KostAufG).
- If public-law rules such as heritage protection prevent an energy retrofit, the landlord's share can be reduced (§ 9 CO2KostAufG). The calculator does not account for this.
- If tenants buy the fuel themselves (for example with a gas heater per flat), they must claim the landlord's share within twelve months of receiving their bill (§ 6 CO2KostAufG).
General template and information, not legal advice. For individual cases ask a notary, a lawyer or a tenants' or owners' association.