Contractual penalty in a lease (smluvní pokuta)

What you can agree on, and how much

The contract must make clear which obligation the penalty secures and how much it is or how it’s calculated. A general statement such as “breach of contract may result in a sanction” is no substitute for a specific clause. Unlike compensation for damage, a penalty doesn’t require you to prove any loss. Paying the penalty, however, doesn’t release the tenant from the original obligation. The basic rules are set out in § 2048 and § 2049.

In residential leases, the penalty and security deposit share a common ceiling: three times the monthly rent. To illustrate: with rent of 18 000 Kč and a security deposit of 54 000 Kč, the deposit alone uses up the entire limit. You can’t add a further contractual penalty on top by claiming it’s a separate item. The shared cap is governed by § 2254.

Why staying within the cap isn’t enough

Even an amount below the cap may not hold up. Consider whether you can impose the obligation on the tenant at all, and whether the clause is manifestly unreasonable. For example, you can’t use a contractual penalty to get around rights the law guarantees to tenants.

A court may reduce an excessively high contractual penalty at the debtor’s request. An unreasonable penalty is therefore not necessarily void outright. Special tenant protection is contained in § 2239, while judicial reduction is governed by § 2051 of the Civil Code. In a dispute, what matters is the specific clause, the obligation it secures and the circumstances of the breach.