Will I become a developer within the meaning of the law by selling units?

The law does not define 'developer' in this context, but you assume similar practical duties: preparing units, selling to multiple buyers, and answering to each buyer under the Czech Civil Code (Občanský zákoník č. 89/2012 Sb.). Your tax classification requires individual verification.

Is income from unit sales exempt from tax?

It depends on circumstances such as holding period, residential use, and whether it constitutes ongoing commercial activity. This is governed by the Income Tax Act (Zákon č. 586/1992 Sb.); verify with a tax adviser or the Czech Tax Authority (Finanční správa).

Legal status and taxation for owners selling a tenement building unit-by-unit

Q: Does the buyer pay acquisition tax when purchasing a unit?

No. The tax on acquisition of immovable property was abolished by Law No. 386/2020.

Q: When does the buyer become the legal owner of the unit?

Only upon registration with the Czech Land Registry (katastr nemovitostí). The Land Office cannot decide before 20 days from notifying the owner, and typical registration takes about 22 days (Cadastral Act No. 256/2013).

Published 4 November 2026

When you sell a tenement building (činžák) unit-by-unit, you shift from building owner to property seller, with legal responsibility to each buyer for title and defects—and your income may be taxed differently than a single sale. Ownership of each unit transfers to the buyer only upon registration with the Czech Land Registry (katastr nemovitostí). Your specific tax treatment depends on your circumstances, so consult a tax adviser or the Czech Tax Authority (Finanční správa).

Summary

By selling unit-by-unit, you assume a seller's role with legal responsibility for title and defects in each unit under the Czech Civil Code (Občanský zákoník č. 89/2012 Sb.).
Units are created by owner declaration and registered with the Czech Land Registry (katastr nemovitostí); buyer ownership arises only upon registration.
The tax on acquisition of immovable property was abolished (Law No. 386/2020); sale proceeds are assessed under the Income Tax Act (Zákon č. 586/1992 Sb.).
Tenancy agreements and mortgages do not terminate on sale; they must be resolved beforehand.
The typical value uplift from unit-by-unit sale versus whole-building sale is +20–40 %; the precise figure will emerge from feasibility analysis.

What changes: from building owner to unit seller

By selling unit-by-unit, you take on a role closer to a property developer than a passive landlord. Until now, you have managed a single building and collected rent. Now you are structuring legal units, signing multiple purchase contracts and answering individually to each buyer.

The law does not define "developer" in this sense; it is a practical term. What matters are the duties arising from the sale under the Czech Civil Code (Občanský zákoník č. 89/2012 Sb.), and how tax law views your activity.

How units are created and ownership transfers

Units do not come into being automatically; they are created by owner declaration and registration with the Czech Land Registry (katastr nemovitostí). An owner's declaration under the Czech Civil Code (Občanský zákoník č. 89/2012 Sb., sections 1166 onwards) defines what constitutes a unit and what the common parts are, and sets the co-ownership shares.

The buyer becomes owner only upon registration with the Land Registry. The Land Office cannot decide before 20 days from notifying the owner (Czech Cadastral Act No. 256/2013 Sb.), and typical registration takes about 22 days. Until then you remain the owner and bear the associated obligations.

Payments must be made cashless, ideally via an escrow account held by a lawyer. Cash payments are limited to CZK 270,000 per day (Law No. 254/2004).

Your legal responsibility to buyers

For each unit sold, you answer to the buyer as the seller, including for defects and legal defects. The purchase contract is governed by the Czech Civil Code (Občanský zákoník č. 89/2012 Sb., sections 2079 onwards); rights relating to defective performance are covered especially in sections 2106 onwards.

In practice this means:

you must deliver the unit to the buyer free of undisclosed mortgages and restrictions,
you must accurately describe the structural and technical condition; hidden defects may come back to haunt you,
any alterations to units or common parts must comply with the Building Act (Stavební zákon č. 283/2021 Sb.) and any required permits,
mortgages, such as bank liens, must be cleared before sale so they can be removed from the units.

Tenants, co-owners and third parties

Sale of a unit does not terminate a lease; the new owner steps into the landlord's position. Under section 2221 of the Czech Civil Code (Občanský zákoník č. 89/2012 Sb.), the buyer assumes the rights and obligations of the landlord. Therefore, account for tenants when planning and deal with them openly.

If the building is owned by more than one person, their consent and agreement on the procedure are necessary. The general right of first refusal for co-owners was abolished in 2020; it now applies only for six months after co-ownership arises through inheritance (section 1124 of the Civil Code). If the building has debts, enforcement or insolvency proceedings may affect the sale (Execution Act No. 120/2001, Insolvency Act No. 182/2006), which must be checked at the outset.

Tax implications for the seller

The tax treatment has changed mainly in how sale income is viewed, not in the transfer itself. The tax on acquisition of immovable property was abolished by Law No. 386/2020, so the buyer does not pay it. However, the seller must handle income tax under the Income Tax Act (Zákon č. 586/1992 Sb.).

In general, sale of real estate is assessed according to factors such as holding period and residential use. With repeated sale of multiple units, however, there may be questions about whether this constitutes ongoing commercial activity taxed differently. It also matters whether you own the building as an individual or a company. Your specific circumstances must be confirmed by a tax adviser or the Czech Tax Authority (Finanční správa); do not rely on general rules.

Why addressing this early pays off

Legal and tax structuring affects how much of the added value you ultimately keep. The typical value uplift from selling a building unit-by-unit versus as a whole is +20–40 %; the precise figure will emerge from feasibility analysis. Legal and tax costs must be included in your calculations.

Therefore, the project goes through three gates (legal, permit, sales gate) and you only move to the next phase with confirmed numbers. You can find a description of the process at Jak to funguje (How It Works). You can get a rough estimate of potential using our kalkulačce potenciálu (Potential Calculator).

What to do now

First have the building assessed; only then decide on the form of sale.

Prepare an extract from the Czech Land Registry (katastr nemovitostí), tenancy agreements, a list of mortgages and debts, and any available building documentation.
Clarify whether you own the building as an individual or a company, and discuss the tax implications with a tax adviser.
Commission an Audit a plán (Audit and Plan), a paid feasibility study with output within 6 weeks.
Choose a form of cooperation: Audit and Plan, End-to-end realisation, or Partnership / JV.

Whether this approach suits your situation can be found at Pro koho je Činžáky.com (Who Činžáky.com is for). You can get a non-binding offer or assessment via the form below the article.