Residual Useful Life Appraisal: Realistic depreciation instead of flat-rate assumptions

by ADEN Immobilien

A residual useful life appraisal makes it possible to align tax depreciation (AfA) with the actual economic remaining life of a building, instead of using flat-rate assumptions. For rented residential properties, depreciation plays a key role in ongoing profitability.

In practice, however, depreciation is often applied very broadly – regardless of the actual condition of the building. In Berlin in particular, where a large proportion of housing stock consists of older and post-war buildings, this flat-rate approach may differ significantly from reality.

This article explains the basic principles, puts the topic into context, and highlights what property owners should pay attention to.

What is a residual useful life appraisal?

A residual useful life appraisal estimates the remaining economic lifespan of a building. It does not concern market value or sale price, but focuses solely on the question:

The appraisal is prepared by qualified experts and typically takes into account:

• the structural condition,
• the scope of previous modernisations,
• the technical building systems,
• energy-related characteristics.

The objective is a plausible and comprehensible assessment, not an exact prediction. Such appraisals are only applicable in well-founded individual cases and do not automatically replace standard depreciation rates (cf. Section 7 (4) German Income Tax Act).

How does depreciation generally work?

For tax purposes, residential buildings are often depreciated over an assumed useful life of 50 years, resulting in a linear depreciation rate of 2% per year.

However, the law explicitly allows deviations from this assumption if the actual useful life is shorter and this can be substantiated (Section 7 (4) sentence 2 German Income Tax Act).

Courts have confirmed that such proof may also be based on structured valuation models, provided they are applied appropriately and well justified (e.g. Federal Fiscal Court, case IX R 14/23). Each case is reviewed individually by the tax authorities.

Why only the building value is depreciable

A key point that is often misunderstood:

Land is considered non-depreciable for tax purposes and is therefore permanently excluded from depreciation. This means the purchase price of a property must be allocated

• between a land component (not depreciable)
• and a building component (depreciable).

Only the building portion is relevant for depreciation and therefore also for a residual useful life appraisal. This separation is mandatory and clearly required by case law.

How is the purchase price allocated?

In practice, several approaches are used:

• The tax authorities often apply a standardised calculation tool, where land value is determined by multiplying the standard land value by the plot size.
• The allocation stated in the purchase contract may serve as an indication, but is not automatically binding.
• Expert valuations are considered particularly reliable, especially where there are significant deviations from standard land values.
• Courts regularly recognise appraisals when they are coherent and realistically reflect local conditions (e.g. decisions by the Berlin-Brandenburg and Düsseldorf Fiscal Courts).

In Berlin, the annually published standard land values provide an important basis for this allocation.

Which factors influence the remaining useful life?

The remaining useful life does not depend solely on age, but primarily on the condition of the building. Key factors include:

• condition of roof, façade and load-bearing structure,
• age and condition of heating systems, pipes and electrical installations,
• scope and quality of previous refurbishments,
• energy efficiency standard.

Missing or only partial modernisations can shorten the remaining useful life. Conversely, comprehensive measures may extend it. Valuation models under the German Real Estate Valuation Ordinance (ImmoWertV) address these aspects systematically, but do not replace an individual assessment.

Typical cases in Berlin’s existing housing stock

In the Berlin market, residual useful life appraisals are particularly relevant in the following situations:

• pre-1925 buildings without comprehensive modernisation,
• existing apartments with outdated building services,
• condominium associations with refurbishment needs in common property,
• buildings where energy upgrades are foreseeable but not yet implemented.

In all these cases, an individual assessment is essential.

Owners residing abroad

Property owners living outside Germany may also be affected. Rental income from properties located in Germany is generally subject to German taxation.

Depreciation – including an adjusted residual useful life – can usually be taken into account. The impact in the country of residence is governed by applicable double taxation agreements. A German tax return is generally required.

What tax authorities focus on

Tax offices review residual useful life appraisals carefully. Common reasons for rejection include:

• insufficient qualifications of the appraiser,
• lack of or only superficial on-site inspection,
• purely schematic assessments without reference to the specific building,
• insufficient consideration of individual characteristics.

Standard depreciation rates remain the norm. Deviations are possible but must be well substantiated. Current case law confirms this approach without lowering the requirements.

FAQ – brief answers