Mixed residential and professional lease in Belgium
The mixed lease in Belgium: how to combine housing and professional activity in the same dwelling. Rules, taxation, insurance and lease clauses.
What is a mixed-use lease
A mixed-use lease is a contract whereby a property is rented to a tenant who uses it both as a residence and as a workplace. This is the typical case of a doctor who has their practice at home, a lawyer with a home office, or a physiotherapist who sees patients at home.
The mixed-use lease differs from simple remote work: in a mixed-use lease, the property is officially allocated to dual use, with a precise split between private and professional areas.
| Situation | Lease type |
|---|---|
| Occasional remote work | Standard residential lease |
| Home office without clients | Residential lease (tolerated) |
| Medical practice in the home | Mixed-use lease |
| Artist’s studio with exhibition | Mixed-use lease |
| Shop with accommodation upstairs | Mixed-use lease or two separate leases |
Applicable legal regime
The regime depends on the predominant use:
Predominantly residential use (above 50%)
The lease follows the primary residence lease rules:
- 9-year (3-6-9) duration
- Tenant protections (notice periods, compensation)
- Free registration
- Rental deposit of 2-3 months
Predominantly professional use (above 50%)
The lease follows ordinary law:
- Duration freely agreed
- Reduced tenant protections
- Paid registration (0.2% of total rent)
- No statutory rental deposit
The split between private and professional use must be mentioned in the lease (as a percentage or in m2). Without mention, the judge will determine the predominant use in case of dispute.
Taxation of the mixed-use lease
The taxation of a mixed-use lease is more complex than for a standard lease:
| Rent portion | Tax base | Rate |
|---|---|---|
| Residential (e.g. 70%) | Indexed cadastral income x 1.40 | Progressive personal income tax |
| Professional (e.g. 30%) | Actual rent x 30% - 40% lump sum | Progressive personal income tax |
Example
Total rent: EUR 1,200/month. Split: 70% residential / 30% professional. Cadastral income: EUR 1,000.
- Residential portion: EUR 1,000 x 2.1016 x 1.40 = EUR 2,942/year taxable
- Professional portion: EUR 1,200 x 30% x 12 = EUR 4,320 gross. After 40% lump sum = EUR 2,592/year taxable
- Total taxable: EUR 5,534/year (instead of EUR 2,942 for a pure residential lease)
The split therefore has a significant tax impact for the landlord. A split too generous towards the professional portion increases the tax.
Drafting the mixed-use lease
The mixed-use lease must contain specific clauses:
- Area split: percentage or m2 allocated to each use
- Precise destination: type of professional activity authorised
- Planning compliance: mention of planning permission if required
- Insurance: the tenant must take out insurance covering both uses (standard home insurance does not cover professional activity)
- Charges: split of activity-related charges (electricity, water, professional internet)
- Signage: conditions for displaying a professional nameplate
Planning and co-ownership
- Check that the co-ownership regulations authorise professional activity
- Apply for planning permission if clients are received on site
- Inform the building manager of the mixed use
To create a compliant mixed-use lease, use our online lease generator which includes mixed-use clauses. For more information, consult our guide on residential leases in Belgium.