The 5 most common lease contract mistakes that could cost you tens of thousands

Most landlords draw up a contract once - when they start renting - and then copy it for 10 years. Meanwhile, legislation and court practice are changing. In this article, you will find the 5 most common mistakes that we see in contracts today, which can cost you tens of thousands in the event of a dispute.

Mistake No. 1: Deposit higher than 3x monthly rent

Civil Code in § 2254 paragraph 1 clearly states that the deposit (security) may not exceed 3 times the monthly rent. This limit is mandatory - it cannot be contractually exceeded.

What happens if you have a deposit of 4x or 5x the rent in the contract? The contractual agreement in this part is invalid - the tenant can demand the return of the amount above the legal limit at any time during the lease term, plus interest on late payment from the original payment.

Practical example: you collect a deposit of Kč 80,000 for a rent of Kč 22,000. The maximum allowed is Kč 66,000. You must return the difference of Kč 14,000 + interest under the applicable Czech Civil Code rule, not an automatically fixed rate. With a 3-year lease = ~3,000 Kč interest. Plus legal costs if the court decides to do so.

Correct: contractually negotiate the bail to exactly 3 times, ideally 2.5-3 months. For higher rents (Kč 50,000+), consider whether you really need the full 3 months - a higher security deposit discourages quality tenants.

Mistake No. 2: Absolute ban on animals

Civil Code § 2258 states that the tenant has the right to keep a pet in the apartment, as long as it does not cause difficulties for the landlord or other residents disproportionate to the conditions in the house. The absolute prohibition "it is forbidden to keep animals in the apartment" is contrary to this arrangement and is invalid.

What you can do: set reasonable limits. Example of admissible wording: "The tenant should communicate a pet request as required by the lease and Czech law; do not turn an example into a universal restriction. The landlord can refuse consent only on the grounds of an unreasonable burden on the property (e.g. breeds prohibited in the Dog Breeding Act, aggressive individuals, exotic animals requiring special breeding conditions)."

What you definitely cannot: terminate the lease because the tenant has a cat or a small dog. The court will cancel such notice.

Practical experience: accepting animals slightly increases the risk of damage to the apartment (increased wear and tear of the floor and textiles), but significantly expands the pool of quality applicants - many families and older tenants have a pet. A better strategy: a higher deposit within the allowed 3 months + insurance.

Damage insurance: Some insurance companies offer landlord insurance with coverage for damage from animal husbandry for 1,500-3,000 Kč per year. Cheaper than lost rent from a quality applicant who you will discourage by banning.

Mistake No. 3: Fine for late payment of rent above the legal limit

Contractual daily fines in residential leases may be invalid; use the statutory late-payment rules and verify the current Czech Civil Code and government regulation.

What you can negotiate: a link to the legal interest for late payment ("the landlord has the right to interest for late payment in the legal amount"). This is a standard wording that is 100% enforceable.

What you cannot do: impose a fixed daily penalty without a valid legal basis. Have any late-payment clause checked against current residential-tenancy law.

Practical procedure for non-payment: do not count fines as income. Instead, quickly activate the standard procedure - a formal reminder after 7 days, a pre-suit reminder after 30 days, the appropriate statutory route after the required notice and remedy steps, depending on the breach.

Mistake #4: Vaguely worded grounds for termination

Many contracts contain wording like "the landlord can terminate the lease if the tenant violates contractual obligations" - without specific specifications. This wording adds nothing to the law; you will still have to rely on § 2288 or 2291 OZ.

What to do instead: specifically specify the tenant's obligations in the contract so that it is clear what the violation is. Examples of useful clauses: "The tenant is obliged to pay the rent no later than the 15th day of the month to the landlord's account." "The tenant may not sublease the apartment to a third party without the prior written consent of the landlord." "The tenant is obliged to allow the landlord to inspect the apartment after prior notification with reasonable prior notice appropriate to the circumstances; no universal 24-hour rule or six-month frequency applies."

These specific provisions do not create new grounds for termination (the law is given), but they do constitute "gross breach of contractual obligations" according to Section 2288, paragraph 1 letter a) easily documented. Without them, the burden of proof is much heavier.

Error No. 5: Missing or insufficient specification of advance payments for services

A standard error is to combine rent and advance payments into one amount ("monthly payment of Kč 28,000 including all services"). This has two problems: (1) it complicates the calculation - you do not have a separate account of how much is the rent and how much of the deposit, (2) it can be tax disadvantageous - everything is taxed as income, instead of deposits being a flow-through item.

Correct wording: "The tenant is obliged to pay the landlord monthly: (a) rent in the amount of 22,000 Kč, (b) deposit for water and sewage in the amount of 700 Kč, (c) deposit for heating in the amount of Kč 2,800, (d) deposit for common areas (elevator, cleaning, lighting) in the amount of Kč 800, (e) deposit for communal waste in the amount of Kč 26,500. Deposits will be billed once a year by April 30 of the following year. (= flow items), (b) accurate billing according to Decree 269/2015 Coll., (c) possibility to adjust individual advances according to actual consumption, (d) protection of the tenant - he knows how much he pays for what.

Related error: missing definition of the billing key. Add the applicable statutory or agreed key to the contract or addendum. Do not copy a universal 30%/70% heat or hot-water split; follow the current decree, building method and service type. Details can be found in the guide /guide/vyuctovani-sluzeb-kompletni.

Sample contract: Updated 2026 lease contract template for free download at /contract-templates. It contains all the correct wording and is checked by a law firm.

Conclusion

A rental agreement is like an insurance policy - investing 30 minutes in writing it correctly can save you Kč 50,000+ in a future dispute. Avoid exorbitant bail, absolute bans, flat fines, vague terms and bundled lease+services. Use the updated template for free on Grento or pay Kč 1,500-3,000 to a lawyer to revise your own contract. With a long-term lease, it returns many times over.

> Czech-law scope and editorial note: Legal, tax, accounting, tenancy, service-charge, condominium, metrology, insurance and data-protection statements in this article refer to the Czech Republic and the rules effective for the relevant date. Figures and examples are illustrative, not legal or tax advice. Verify current rules with the relevant Czech authority or a qualified adviser.

> Security-deposit clarification: Under Czech Civil Code § 2254, the ceiling is tied to three times the monthly rent and the tenant has a right to interest. The provision does not create a universal separate-account or 30-day return rule, and service advances do not automatically count toward the rent-based ceiling. Settle the balance and interest without inventing a statutory deadline.