The Process on the New Property Tax (Grundsteuer): What Property Owners Need to Know

One of Germany’s most closely watched legal disputes this year concerns the reform of the property tax (Grundsteuer). Following the 2018 ruling of the Federal Constitutional Court, the government introduced a new valuation model scheduled to take effect in 2025. Several federal states, however, argue that the reform is unfair and have filed constitutional complaints.

Why the Reform Is Controversial

The reform was intended to modernize the outdated system and ensure more transparent and equitable taxation. In practice, though, it has raised a number of issues:

• a significant increase in administrative workload,
• reliance on data that may not be available or accurate nationwide,
• strong regional disparities in the resulting tax burden.

In October and November 2025, several states lodged constitutional challenges, claiming that the new model violates the principle of equal taxation.

Positions of the Parties

Critics argue that:

• the calculation relies heavily on market variables that are difficult to measure precisely,
• owners in certain regions may face disproportionate tax increases.

The federal government counters that:

• the reform was required to comply with the Constitutional Court’s decision,
• states are free to apply their own valuation models.

Status of the Court Proceedings

The courts are currently examining whether the reformed Grundsteuer model complies with the German Constitution. Decisions have not yet been issued, but the case is already seen as one of the most significant tax law matters of the year.

What This Means for Property Owners

Until the courts rule otherwise, the new rules remain in force. For property owners, the accuracy of their Grundsteuer declaration is especially important, as incorrect data may lead to unnecessary tax burdens.

In complex situations or where the valuation seems unclear, seeking advice from an attorney specializing in tax law can help identify potential risks early and ensure proper handling of the process.

Conclusion

The Grundsteuer reform is among the most important tax law developments of 2025. As the courts continue their review, property owners should stay informed and seek professional guidance when needed.