Index-linked rent

Index-linked rent - With index-linked rent, the rent amount is tied to the Consumer Price Index (CPI) published by the Federal Statistical Office. This form of rent, regulated by Section 557b of the German Civil Code (BGB), allows for automatic adjustments to the rent in line with general price trends without the need to negotiate a new lease agreement each time.

How Index-Linked Rent Works in Detail

An index-linked rent agreement must be set forth in writing in the lease agreement. The sole benchmark is the Consumer Price Index for Germany published by the Federal Statistical Office. Other indices, such as a regional rent index, are not permitted by law.

The rent adjustment does not occur automatically but requires a written request for an increase (an email is sufficient). In this request, the landlord must specify the change in the Consumer Price Index that has occurred, as well as the new rent as a specific monetary amount. The increase takes effect no earlier than the month following the month after the request for an increase is received.

There must be at least one year between two rent increases based on the index. The landlord is therefore not obligated to adjust the rent annually-they may combine several index changes and apply them as a single increase. Conversely, the right to adjust does not lapse: If the landlord has not acted for several years, they cannot demand retroactive payment for the past period, but they may factor the accumulated index difference into future rent in a single step.

A key difference from a regular rent increase: During the term of an index-linked rent agreement, the landlord may not demand a rent increase due to modernization. The only exception applies to energy-efficiency upgrades, where the costs may be apportioned to the tenant on a pro-rata basis. An adjustment to the local comparative rent is also excluded, which can be both an advantage and a disadvantage for the tenant.

The rent cap applies to the initial rent in the case of an index-linked rent. In areas with a tight housing market, the agreed-upon initial rent may therefore be no more than ten percent above the local comparative rent. However, subsequent index-based adjustments are not affected by this.

Calculation of the Index-Linked Rent Increase

The calculation of an index-linked rent increase follows a clear formula. The starting point is the CPI value at the time of the most recently agreed-upon or assessed rent (base index) and the current CPI value at the time of the request for an increase (new index). The percentage change in the index is calculated as: (new index / base index - 1) × 100. This percentage is applied to the current net rent excluding utilities.

Example: The net rent is 900 euros, the base index was 120.0, and the current index is 130.0. Index change: (130.0 / 120.0 - 1) × 100 = 8.33%. New rent: 900 euros × 1.0833 = 975 euros. In the rent increase notice, the landlord must specify both CPI values (with source and date) as well as the new rent as a euro amount. A notice stating only a flat percentage without a specific final amount is invalid.

Advantages and Disadvantages for Landlords and Tenants

For landlords, index-linked rent offers effective protection against inflation. The rent rises in line with general inflation, so that the real rental yield is maintained. In addition, the process is straightforward, as no rent index needs to be consulted and no justification is required. The relationship with the tenant generally remains less contentious than in the case of disputed rent increases based on the rent index.

Tenants benefit from the fact that rent increases are transparently and clearly linked to a publicly available index. In times of low inflation, rent barely rises. However, rent can rise significantly during periods of high inflation, as the years 2022 and 2023 have shown-with index-based increases of over 8% within a single year. Conversely, if the consumer price index falls, the tenant also has the right to demand a rent reduction.

Another advantage of index-linked rent over regular rent increases based on the rent index: Landlords do not have to regularly grapple with new rent indices, which in some cities are methodologically controversial or do not adequately account for specific properties. Index-linked rent is a clear, legally sound mechanism that provides clarity for both parties.

Index-Linked Rent vs. Graduated Rent

In addition to index-linked rent, graduated rent (§ 557a BGB) serves as a second alternative to regular rent increases. The two forms are mutually exclusive-a lease agreement cannot contain both an index-linked rent clause and a graduated rent clause at the same time. The graduated rent clause specifies fixed increase amounts or percentages on specific dates, thus offering maximum planning security for both parties, but does not protect against unexpectedly high inflation. Those seeking long-term protection of purchasing power are better served by the index-linked rent.

Practical Tip for Nuremberg and Franconia

In the Nuremberg metropolitan region, index-linked rent is gaining increasing importance, particularly among investors in neighborhoods such as Gostenhof, Maxfeld, or Nuremberg’s Südstadt. For landlords seeking to secure their purchasing power in the long term, index-linked rent is an attractive option in a market with stable demand-such as Nuremberg.

We recommend that landlords not request an increase with every minor index change, but rather at reasonable intervals of one to two years. This preserves the tenancy relationship and reduces administrative burden. At the same time, the landlord should keep an eye on index trends to ensure they do not miss any adjustment rights. We assist our clients in Nuremberg and the surrounding region with accurate calculations, legally sound drafting of rent increase requests, and the general question of whether index-linked rent or graduated rent is the better solution for the specific property and the respective tenant.

Frequently Asked Questions About Index-Linked Rent

Can rent also decrease if inflation falls?

Yes, index-linked rent works both ways. If the Consumer Price Index (CPI) falls, the tenant may request a corresponding rent reduction in writing. In practice, this rarely occurs, as the CPI tends to rise over the long term. Nevertheless, landlords should factor this scenario into their calculations. Some lease agreements contain a minimum rent clause that prevents the rent from falling below the initial rent-however, such clauses can jeopardize the validity of the entire index agreement and should be reviewed by a lawyer.

Can the landlord make improvements with an index-linked rent?

The landlord may make improvements but generally may not pass the costs on to the tenant. An exception applies exclusively to energy-efficiency improvements, such as the installation of a heat pump or facade insulation. We recommend carrying out planned non-energy-efficiency improvements before the index-linked lease agreement is signed.

How is the new rent calculated during an index adjustment?

The calculation is based on the percentage change in the consumer price index. The formula is: new index divided by old index, multiplied by the previous net rent excluding utilities. The request for an increase must include both CPI values (date and source) as well as the new rent as an absolute euro amount. We are happy to assist our clients in Nuremberg and the surrounding area with the correct calculation and formulation of the rent increase request.

Does the index-linked rent also apply to furnished apartments?

Yes, an index-linked rent agreement is also permissible for furnished apartments, provided that Section 557b of the German Civil Code (BGB) applies. It should be noted that furnished apartments generally include a furnishing surcharge in addition to the local standard rent index; this surcharge is not covered by the index adjustment if it is listed separately.

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