Reference rent, location surcharge and category in an apartment building: income risk before purchase

For apartment buildings under full application of the Austrian Tenancy Act, the permitted main rent is often driven by a combination of the reference rent (Richtwert) with surcharges and deductions and, for older leases, the category rent. These grounds are more than a price range. They shape the buyer's income projection, the refund exposure in existing leases and the drafting of the sale contract.

This article organises the three review axes. It covers scope, the basics of reference rent formation, the requirements of the location surcharge, the treatment of equipment categories and the consequences for income model and clauses. Indexation, fixed term rules and rent review proceedings are treated in dedicated articles.

Why reference rent, location surcharge and category belong together

For apartments under full application of the tenancy act, the reference rent (Richtwert) is often the dominant pricing basis. In very old leases the category rent may still apply. In certain segments the appropriate main rent comes into play. Without that classification a defensible income projection for an apartment building is not possible.

The three elements are practically linked. The reference rent sets the base level, surcharges and deductions (including the location surcharge) differentiate the unit and the category secures the frame for older leases. Tenancy scope classification and rent review proceedings are separate review steps; indexation and fixed terms are covered in the dedicated articles on this topic.

Reference rent system: frame, surcharges and deductions

Section 16 MRG anchors the reference rent system for main leases of apartments in full application. The Reference Rent Act specifies how the reference rent is formed using the statutory reference apartment and complementary valuation rules. The concrete reference amounts are published by the Federal Ministry of Justice for each federal state and periodically adjusted.

The concrete rent is derived from the reference rent plus value-increasing surcharges and value-decreasing deductions. Equipment, layout, natural light, condition, substance, floor area and the maintenance state of the building are all relevant. Documentation as of lease start is essential. Surcharges asserted only later without an underlying assessment usually do not survive a review.

For the buyer it matters whether the assessment records are present in the data room. Without them, the level of the agreed rents cannot be verified. The rent roll plausibility check can highlight red flags for an initial intake. The follow-up review remains lease-specific.

Location surcharge: requirements and tenant notice

Under section 16(4) MRG, which refers to section 2(3) of the Reference Rent Act for the above-average location criterion, a location surcharge may only be considered where the relevant circumstances have been expressly communicated to the tenant in writing by the time the lease is concluded. Without that written notice the location surcharge is generally not permissible, and the agreed rent exceeds the statutory ceiling.

The location surcharge is therefore a frequent risk factor in apartment building review. Where the rent roll relies on a material uplift from location quality, the underlying tenant notice must be documented. Otherwise the tenant may challenge the excessive rent within the applicable window. The permitted rent level also binds the buyer after the sale; liability for payments made before the transfer instead depends on who received them and on the particular claim pursued.

For the sale contract a per-unit matrix showing location assessment, notice date, form and recipient is recommended. Undocumented location surcharges should be disclosed and secured through purchase price retention or targeted guarantees with an indemnity. Blanket guarantees usually do not carry this risk fairly.

Equipment category and category rent for older leases

For certain older leases, the category rent under section 15a in combination with section 16 MRG remains relevant. Equipment categories A, B, C and D refer to defined characteristics at the lease start, in particular the presence of toilet, bath, kitchen and heating and a usable condition. Category D distinguishes between usable and unusable condition.

Two questions dominate the purchase review. First, which category actually existed at lease start and how it is documented. Second, which changes have occurred since and whether a downgrade is possible. Evidence ranges from handover records to construction and refurbishment files, photographs and contractor invoices. Without documented categories, the refund exposure in a later review can be significant.

For income modelling, category rents act as a tangible cap. They can be affected indirectly through maintenance and improvements, but not by mere reclassification in the data room. The sale contract should be clear about which statements from the data room are treated as seller knowledge and which as formal assurance.

Deductions, fixed terms and interplay with other rules

Alongside reference rent formation, further rules on rent formation apply. The fixed term discount under section 16(7) MRG reduces the permitted rent for fixed term residential leases by one quarter. The reduction lapses on conversion into an open-ended lease and directly affects the income model. This is best reviewed together with the article on fixed term leases.

Deductions for poor equipment, substance defects or unfavourable layouts must also be considered. They do not follow a rigid table but a case-by-case assessment under the Reference Rent Act. It matters that equipment shown in the data room without evidence may lead to deductions on a later review.

For commercial premises the reference rent system does not apply. The main rent is measured against the appropriate main rent under section 16(1) MRG where full application applies, on the basis of comparables and specific equipment. See the article on commercial premises for detail.

Review, refund and limitation window

If the agreed main rent exceeds the amount permitted under section 16 MRG, the tenant may claim a refund of the overpayment. The application is filed with the conciliation board or the district court. Section 16(8) MRG sets a limitation window whose length depends on the time and type of lease. The window is preserved by filing the application.

For buyers, an existing or foreseeable proceeding represents a concrete burden. For sellers, it usually arises as a knowledge question in the data room. The sale contract should allocate responsibility for refunds issued before the effective date and set a process for proceedings filed later.

For data room structure, the data room completeness check helps align assessment records, tenant notices and equipment protocols.

Contract clauses, guarantees and income model

For the sale contract, differentiated guarantees are recommended. Suitable elements cover the tenancy scope, reference rent, location surcharge, equipment category and the effectiveness of tenant notices. They should be structured per unit so that individual deviations do not undermine the whole guarantee.

The seller protects itself with carefully drafted knowledge limits and honest disclosure. The buyer protects itself with purchase price retention for specific risks, indemnities for refund proceedings and a timed adjustment mechanism. The income model should show the potential refund and adjustment path in a base case.