Building Renovation and Taxation: What Property Owners Should Consider in Their Tax Return

The distinction between maintenance expenses and acquisition or production costs is of significant practical importance for property owners and landlords. In a new circular, the German Federal Ministry of Finance has replaced its previous administrative guidance on this distinction. This article outlines the resulting tax risks and planning opportunities for property owners.

New 2026 BMF regulations: What property owners need to know

On January 26, 2026, the Federal Ministry of Finance issued a new circular replacing prior guidance (particularly the 2003 circular) on distinguishing between maintenance expenses (immediately deductible) and acquisition/production costs (deductible only via depreciation). At its core, the issue concerns how renovation and modernization costs can be treated for income tax purposes (e.g., rental income), and how they should be classified.

“Renovation in installments”: Tax risks of staggered modernization

If a building is modernized gradually over several years rather than in one phase, the tax authorities may treat the measures as a single overall renovation project. This can result in costs that would otherwise be immediately deductible being reclassified as acquisition or production costs (i.e., only deductible via depreciation). Previously, a five-year assessment period applied.

Shortened assessment period: 3 instead of 5 years

Under the new rules, the presumption generally applies to a three-year period. In practice, this means:
If modernization measures are carried out step by step within three years, the risk increases that the tax authorities will treat them as a bundled measure—thus disallowing immediate deduction.

Example

A multi-family house is modernized over three years: heating in year one, bathrooms in year two, and windows/electrical systems in year three. Even if each measure alone would not trigger a reclassification, the combined view may result in treatment as acquisition/production costs.

The 15% Rule: When renovation costs become acquisition costs

A well-known rule: if renovation costs within the first three years after acquisition exceed 15% of the building’s purchase cost, they are automatically classified as acquisition-related production costs (no immediate deduction).

Stricter interpretation by tax authorities and courts

The new guidance elaborates this rule in greater detail and clarifies its broader practical scope:

• Exact three-year period: Begins precisely at the transfer of beneficial ownership (typically transfer of possession, benefits, and risks).
• Construction work performed is decisive: It is not necessary for work to be completed or paid—what matters is what has actually been carried out (estimated if necessary).
• Cosmetic repairs are included: Painting, flooring, and wallpapering are counted—even if often considered minor.
• Certain costs are excluded: For example, tenant compensation payments or typical annual minor repairs may not be included, depending on the case.

Example

• Within the first three years, you renovate bathrooms, electrical systems, and floors, repaint everything, and replace doors. Even though much of this is merely “cosmetic,” these cosmetic repairs can be included in the 15% test—and this can invalidate the immediate deduction.
• You pay a tenant a severance payment so they’ll move out, and then renovate the property. The severance payment shouldn’t be included in the 15% calculation—but the remaining construction costs can still count toward the limit.

“Operational Readiness”: When conversion costs count as acquisition costs

After purchasing a property, owners often carry out modifications expecting immediate tax deductibility.

Greater emphasis on intended use

The Ministry now emphasizes not only whether a building is objectively usable, but also whether it is functionally suitable for the intended purpose.

Implication: If the property must first be adapted to meet the intended use, these costs may qualify as acquisition costs.

Examples

• Electrical systems sufficient for residential use but not for office use → adaptation costs may be acquisition costs.
• Conversion from office space to a dental practice → costs are treated as acquisition costs because they establish usability for the intended purpose.

“Standard Upgrade”: When modernization costs are not immediately deductible

The established rule remains: if modernization affects at least three of the four core areas—heating, sanitation, electrical systems, and windows—a “standard upgrade” is assumed. In such cases, immediate deduction is generally not permitted.

More clarity and updated examples

While the overall system remains unchanged, the new guidance provides clearer distinctions:

• Baseline assumption: A medium standard is assumed unless there is clear evidence of a very simple or very high standard.
• Modern examples: Smart home systems, marble tiles with digital fittings, or tinted glazing may indicate a higher standard.
• Definition of a very simple standard: Only applies where the condition is clearly outdated (e.g., no proper heating or ventilation, single-pane windows, minimal electrical capacity).
• Other measures excluded: Renovations outside the four core areas (e.g., insulation or flooring repairs) are not considered in the standard upgrade assessment.

When to seek tax advice before renovating

Professional tax advice is particularly recommended if:

1. Major renovations are planned within three years of purchase.
2. Renovation is carried out in stages over multiple years.
3. The intended use of the property changes.
4. Work affects multiple core areas (heating, sanitation, electrical, windows).

Conclusion: Early planning prevents tax disadvantages

The 2026 guidance does not fundamentally change existing rules but clarifies key areas and better reflects modern renovation practices, including energy-efficient upgrades. However, classification issues will continue to arise in practice. To ensure optimal tax outcomes, property owners should address tax structuring at the planning stage of renovation projects.

Please feel free to contact us—we can advise you on tax-efficient planning for renovation projects.