Inflation in Germany is likely to have reached 3.3 percent in September 2026. The Federal Statistical Office published this figure on 30 September as a flash estimate, after 2.9 percent in August and 2.8 percent in July. Consumer prices rose by 0.6 percent month on month. The increase is driven almost entirely by energy, which rose by 14.9 percent in September, after 10.5 percent in August and 8.3 percent in July. Core inflation excluding energy and food, by contrast, remained unchanged at 2.4 percent. For owners and occupiers of logistics and industrial space, this is more than a statistical footnote, because a large share of current leases is linked to the consumer price index. What begins as an energy shock on the consumer side reaches occupiers' cost centres and investors' cash-flow forecasts via the indexation clause.
A price impulse with a distinctive structure
The composition of inflation matters more for the assessment than the headline. According to the Federal Statistical Office, goods prices rose by 3.8 percent in September, services by only 2.7 percent and food by 0.4 percent. In August, motor fuel was 27.7 percent and heating oil 49.6 percent more expensive than a year earlier, while household electricity, natural gas and district heating actually became cheaper thanks to government relief measures. Producer prices for industrial products were 4.6 percent above the previous year in August, intermediate goods 6.1 percent, with petroleum products and metals contributing most. Excluding energy, producer prices rose by only 0.2 percent month on month.
This picture points to an imported, concentrated cost shock rather than a broad wage-price dynamic. The European Central Bank essentially shares this assessment. In its projections of 10 September, it expects euro-area inflation of 3.0 percent this year, 2.5 percent in 2027 and 2.1 percent in 2028, with a peak of 3.6 percent in the fourth quarter of 2026. It sees core inflation at 2.5, 2.6 and 2.3 percent. At the same time, the Governing Council raised key interest rates by 25 basis points, putting the deposit facility rate at 2.50 percent, and explicitly did not commit to a future rate path. On 30 September, the ifo Institute reported that companies are increasingly passing on higher energy costs: the indicator for planned price increases rose to 22.7 points, to 35.6 points in retail and to 24.8 points in energy-intensive industry. The institute's forecasting department also expects rates above three percent in the coming months.
How indexation clauses calculate and where they lag
An indexed rent adjusts the rent at agreed intervals in line with the percentage change in the consumer price index. In practice, four parameters determine how strongly a price impulse like the current one feeds through. First, the base value: what counts is the index level in a month specified in the lease, not the most recently reported annual rate. Second, the trigger: many clauses only apply once the index has moved by a threshold, often five percent or a corresponding number of index points, and then reset the base value. Third, the mechanism: an automatic adjustment takes effect on the agreed date, while an adjustment on request requires a declaration by the landlord and, depending on the wording, only applies going forward. Fourth, the limitation: caps, partial pass-through or corridors prevent abrupt increases, but do not protect against a later catch-up if the clause permits it.
Two features of this mechanism are decisive in the current situation. The adjustment lags behind the price impulse, because the threshold, the reference date and the notice period take time. And it reflects the index only with a delay, so an energy price spike reported today typically arrives as additional rent only in the next or the following adjustment round. A simple example illustrates the order of magnitude. With an initial rent of 7.00 euros per square metre and full pass-through of 3.3 percent, the rent rises by around 23 cents. For a 20,000 square metre warehouse, that means roughly 4,600 euros per month, or a good 55,000 euros per year. With an agreed cap of two percent, it would be around 2,800 euros per month. The difference shows how much depends on the clause mechanics long before a market rent is negotiated.
Alongside pure indexed rents, hybrid forms are becoming more common. A stepped rent sets fixed increases in advance and gives both sides planning certainty without reacting to the index. Hybrid models combine a basic step schedule with an index component above a corridor. In an environment where inflation forecasts shift by several tenths of a point within a few months, the trade-off between predictability and inflation protection shifts noticeably. Owners tend to prefer indexation, occupiers fixed steps, and agreement is often reached through lease term and corridor limits.
Legal framework: what makes indexation clauses robust
Commercial leases in Germany are subject to the Price Clause Act (Preisklauselgesetz) and the general rules on standard business terms. According to the prevailing legal view, indexation clauses are permissible above all in long-term leases, with courts typically recognising a commitment of ten years, whether through a fixed term, renewal options or a corresponding waiver of termination. The clause must be specific: it must state which index, which base month, which rent (net or gross) and which calculation method apply. Even between businesses, pre-formulated clauses are subject to a transparency review, and one-sided or economically unbalanced wording is scrutinised critically.
In practice, this means that lease portfolios with older or imprecisely drafted clauses now deserve closer examination. Invalid clauses can render an expected rent increase void, and unclear conversions to new index bases can trigger disputes. The Federal Statistical Office maintains the consumer price index on a fixed base, and leases referring to earlier base years require a clean conversion. Anyone preparing adjustments now should check contractual deadlines, formal requirements and index references asset by asset before the first declaration is sent. Individual legal questions belong with legal counsel, but the structure of the review can be standardised at portfolio level.
The occupier perspective: affordability rather than nominal rent
For occupiers, the key question is not whether the rent rises, but whether the additional burden fits their own revenues. In autumn 2026, logistics service providers and retailers are carrying several cost blocks at once: motor fuel, which according to the Federal Statistical Office was more than a quarter above the previous year in August, rising input prices and foreseeably higher electricity and gas prices in winter. Passing these on to customers only works in part. The ifo price indicator shows the highest willingness to raise prices in retail, but the BVL logistics indicator, at 86.3 points in the third quarter, was above the second quarter yet well below the 100 mark. The ifo business climate improved to 89.9 points in September, and the Bundesbank expects a temporary slowdown in the third quarter, partly because of high energy prices and low water levels on the Rhine.
For occupiers, this means treating indexation as part of the total cost of occupancy rather than in isolation. An indexed rent with a cap can be cheaper than a stepped rent if inflation falls back to two percent after the peak, and more expensive if energy prices stay high. When negotiating renewals, occupiers can offer caps, symmetrical adjustment upwards and downwards, longer adjustment intervals or a link to a core inflation measure in return for a longer term. Service charges also belong in the analysis: where heating and energy costs are passed on, the room for rent increases shrinks, because the total burden is what counts.
The investor perspective: cash flow, interest rates and valuation
For owners, indexation increases cash flow at exactly the moment financing costs are rising. With the deposit rate at 2.50 percent and an interest rate environment that the ECB assesses meeting by meeting, the requirements for current income are increasing. The indexed additional rent acts as partial inflation protection, but it only offsets the burden if the clause actually passes the price impulse through. With thresholds of five percent or caps of two percent, part of the inflation remains with the owner. In valuation, what matters is not only the nominal rent but the quality of income: a tenant able to bear an adjustment is worth more than a formally higher amount that leads to payment problems.
Investors also need to separate the interest rate effect from rental growth. If yield requirements rise at acquisition and exit, indexation only compensates if the rental increase exceeds the valuation effect, and it is tied to the lease term: leases with a short remaining term benefit less, because re-letting takes place at market rent anyway. For core-plus and value-add strategies, the lease expiry profile is therefore as relevant as the quality of the clauses. In addition, a further rise in inflation to 3.6 percent in the fourth quarter, as projected by the ECB, could intensify the debate about the affordability of commercial rents. Owners who maintain an early dialogue with occupiers avoid conflicts that later turn into vacancy risks. A transparent presentation of how the adjustment affects the occupier's total burden, including service and energy costs, is helpful. It shows early which tenants are approaching the limit of affordability and leaves time for solutions such as phased introduction, an extended term or an adjustment of the space.
Options for action
For asset managers, a portfolio review along four criteria is advisable: index and base year, thresholds and caps, adjustment frequency and remaining lease term. From this, it can be derived to what extent and when current inflation actually reaches cash flows. For new leases, a balanced structure is recommended, with a clearly defined index, moderate thresholds and, where occupiers request it, a cap in exchange for a longer term. Occupiers should align adjustment dates with their own pricing rounds and model scenarios for inflation rates between two and four percent before exercising renewal options. Fund managers should consider the sensitivity of their valuations to interest rates and indexation together, rather than treating the two effects separately.
Strategic relevance and outlook
Current inflation is energy-driven, and the ECB's projections see it easing again from 2027. Leases, however, last longer than energy price cycles. The quality of the indexation clause determines for years how fairly inflation risks are shared between owner and occupier and how resilient rental income remains in a higher interest rate environment. The Federal Statistical Office publishes final September figures on 13 October, and the next ECB Governing Council meeting takes place on 29 October. Both dates will indicate whether the price impulse broadens or remains confined to energy. For decision-makers, this results in a sober task: review clauses, organise lease terms and set the allocation of inflation risk in the lease so that it holds even if today's assumptions do not materialise.