Section 18 MRG rent increase in an apartment building project: when it truly carries the deal

A rent increase under section 18 of the Austrian Tenancy Act, the MRG, is often treated as a second yield lever in an apartment building acquisition. That view underestimates the mechanism. Section 18 does not optimise return. It funds a specific major maintenance work whose costs cannot be covered by the reserve of past principal rents and the income expected during the distribution period. Anyone who plugs a section 18 cash flow into a purchase price model without verifying the requirements and the procedural status risks overpaying and later restatements.

Buyers, sellers and owners preparing a maintenance package should therefore separate three layers. First, the substantive basis: is there an imminent major maintenance work in the sense of section 3 MRG and does the arithmetic actually produce a funding shortfall? Second, the procedural status under sections 18, 18a and 19 MRG: merely considered, filed, decided in principle, provisionally increased or finally set? Third, the translation into contract, data room and handover. Only when these three layers speak the same language can a section 18 income position be honestly built into the valuation.

When section 18 MRG applies at all

Section 18 MRG requires an imminent major maintenance work which the landlord must carry out. A desirable modernisation, a purely cosmetic upgrade or a mere standard increase is not enough. The renovation items must qualify as maintenance work within the meaning of section 3 MRG because the increase mechanism only attaches to that category. The article on maintenance works in an apartment building explains why the boundary against improvement and voluntary investment must already be drawn cleanly in the tender.

Section 18(1) MRG further requires that the costs of the work, including the interest and financing costs allowed under section 3(3)(1) MRG, are not covered by the reserve or shortfall of the principal rents in the ten preceding calendar years and exceed the principal rent income expected during the distribution period. It is only from this calculation that the so-called funding shortfall, the Deckungsfehlbetrag, arises as the starting figure for every increase.

The assessment is object-specific and arithmetical. A high renovation figure alone does not suffice if the ten-year reserve already covers it. Conversely, even a medium project can produce a shortfall where earlier works have used up the reserve. In practice, the questions about MRG scope and reserve position should be clarified alongside the technical planning, not left to the sale agreement.

Reading the ten-year accounting basis correctly

Section 20 MRG obliges the landlord to keep, for every calendar year, a clear account of income and expenditure. Section 18 then relies on the principal rent account of the ten preceding calendar years. Where individual years are missing, where they are substantively incomplete or where they lack supporting documents, the funding calculation becomes vulnerable in the proceedings and in a price negotiation reviewing the reasonableness of the assumed section 18 income.

Within the ten-year basis, principal rent income, imputed amounts for owner-used or long-vacant units and the actual maintenance expenditure must be neatly separated. Not every invoice that has been paid reduces the reserve within the meaning of the statute. Service charges, management fees or voluntary improvements sit in different accounting circles. Anyone contemplating section 18 in advance should therefore ask the property manager to align the ten-year account in a structured way.

For a buyer this means: the data room of an apartment building with an announced increase requires the annual accounts in original, the schedule of vouchers, any tenant objections and evidence of reserves already distributed or applied. The topic page on rent rolls and lease agreements is relevant because refund claims from individual tenants can retroactively change the reserve position.

Principle decision and provisional increase under section 18a MRG

A step frequently overlooked is the opportunity to obtain a decision in principle under section 18a MRG before the maintenance work is carried out. On application, the court or the competent municipality first decides in principle whether and to what extent the specifically identified maintenance work justifies an increase and within which period, not exceeding ten years, the costs must be covered from the principal rents.

Where the landlord undertakes to commence and carry out the identified works within a reasonable period, the authority may authorise a provisional increase of the principal rent. Its start and amount are set so that the provisional increase does not exceed the amount likely to result from the final decision. This intermediate stage creates liquidity for construction, but it shifts risk. If the landlord fails to honour the undertaking, the additional amounts collected under the provisional increase must be refunded to the tenants together with appropriate interest.

For a transaction this intermediate stage is particularly sensitive. A provisional increase is not yet economically earned. A buyer should know whether and to what extent the promised works have started, which deadlines the seller has accepted and who bears the refund exposure if the works are not carried out as planned. These points belong openly in the price model and the contract, not in a footnote of the valuation sheet.

Application, jurisdiction and documents under section 19 MRG

Collecting an increased principal rent presupposes a decision of the court or the competent municipality under section 39 MRG. The landlord, the municipality within its own sphere of competence and an administrator appointed under section 6(2) MRG are entitled to apply. Without such a decision the increased rent may not be collected, however impressive the cost plan or the property manager's conviction about the shortfall.

The application must, under section 19(1) MRG, be accompanied by a quotation for the imminent maintenance work in three counterparts, the principal rent account for the ten preceding calendar years, a complete schedule of all rented, lettable or landlord-used units including topographical identification, floor area, equipment category and current principal rent, the calculation of the funding shortfall and monthly funding requirement, and a financing plan including any credit commitments. Any missing element leaves the application open to challenge.

Under section 19(2) MRG, the authorisation to collect the increased rent is generally coupled with an order to commence the underlying maintenance work within a reasonable period not exceeding one year. The increase therefore serves a specific building purpose. It is not an open income position. The apartment building risk check offers a structured first orientation for the state of the documents.

What a section 18 income really means for valuation

An increased principal rent that has not yet been finally set is not a contractual rent. It is a payment permitted during a fixed distribution period not exceeding ten years, if and to the extent that the procedure confirms the statutory requirements. After the distribution period the additional amount ceases. A cash flow modelled without that limitation systematically overstates the yield.

It is also essential to distinguish whether the increase is merely considered, filed, decided in principle, provisionally set or finally set. Each stage carries a different legal risk. An unfiled increase is a forecast. A provisional increase is refundable if the works are not performed. A final increase is bound to a specific quotation and distribution period. Change orders, delays or cost shifts can affect the picture, especially when a buyer steps in.

Owners combining a financed renovation with subsidies should also weigh the tying effects of these grants. Conditions, repayment obligations and rent limits belong in the data room completeness check because they can change the section 18 calculation. For a buyer the message is: the income from a section 18 increase is assessed with risk-adjusted assumptions, not treated like an established lease.

Align data room, contract and handover

The data room of an apartment building with a section 18 dimension goes far beyond a quotation. It requires the ten-year principal rent account, the complete schedule of units, all procedural filings and decisions, notices from the municipality under section 39 MRG, any decision in principle under section 18a MRG, the financing plan with credit commitments, evidence of reserves built or consumed, subsidy documentation and the tenant correspondence about the announced works. Without these components every valuation remains an assumption.

The sale agreement must name the procedural stage precisely. Who bears the building costs until the effective date, who the financing interest, who the responsibility for actual performance of the works? Where a provisional increase is in place, the parties must also allocate the refund exposure and the interaction between the eventual final decision and the price. The page on old building renovation and maintenance collects the contract mechanics for renovation-driven acquisitions.

At handover, the incoming manager takes over more than accounts and meter readings. Active proceedings, deadlines for construction, tenant communication and the ongoing reserve build all move across. Only when these handoff points are named in the contract and rehearsed in the handover practice does a section 18 position become a manageable economic building block instead of an open flank.