Brussels-Capital Region

Living in Watermael-Boitsfort (Watermaal-Bosvoorde)

Watermael-Boitsfort (Watermaal-Bosvoorde) is a commune in the Brussels-Capital Region. Administrative language: French and Dutch. Below are the local figures that change what you pay and who your neighbours are, each with its official source.

Map of Belgian communes coloured by their 2026 commune income tax surcharge
Commune income tax surcharge 2026under 6.5%6.5 to 7.2%7.2 to 7.8%7.8 to 8.2%8.2 to 8.6%8.6% and moreBoundaries © NGI-IGN, AdminVector, CC BY 4.0.
Population on 2026-01-01
25,282
National Register (IBZ), retrieved 2026-11-02
Residents with a foreign nationality
21.5% (5,442 people)
Lower than most communes in the Brussels-Capital Region (regional average 35.3%). Statbel, 2026-01-01.
Commune income tax surcharge 2026
6.90%
On every €1,000 of federal income tax you owe, the commune adds €69.00. Rank 12 of 19 in Brussels-Capital Region (1 = lowest); Brussels-Capital Region average 6.37%. Source, retrieved 2026-11-02.
Property tax: commune centimes 2026
3,390
Added to the regional property tax (précompte immobilier / onroerende voorheffing) paid by owners. Rank 4 of 19 in Brussels-Capital Region (1 = lowest). communal centimes only; the Brussels agglomeration adds 989 centimes (same source page). Source.
Largest foreign nationalities (2026-01-01)
France: 1,383Italie: 432Espagne: 327Allemagne: 292Portugal: 245
Brussels statistics institute (IBSA), nationality names as published in French.
Postal codes
1170
REFNIS (INS/NIS) code 21017. bpost list.

What these numbers mean for you

The commune surcharge is not taken from your payslip separately: your employer withholds tax at a flat rate, and the real commune percentage is applied when your yearly tax assessment is calculated. That is why two colleagues with the same salary can get different refunds or bills if they live in different communes. Use our salary calculator for the monthly figure.

Property tax centimes only concern owners. The higher the number, the more the commune adds to the regional base tax on the cadastral income of the property.

Registering in Watermael-Boitsfort (Watermaal-Bosvoorde)

When you move here you must register your address at the commune's population office (service population / dienst bevolking) shortly after you move in (your commune states the deadline); a police officer then checks that you actually live at the address. See our commune registration guides for the documents to bring.

Nearby communes

Anderlecht, Auderghem (Oudergem), Berchem-Sainte-Agathe (Sint-Agatha-Berchem), Bruxelles (Brussel), Etterbeek, Evere, Forest (Vorst), Ganshoren, Ixelles (Elsene), Jette, Koekelberg, Molenbeek-Saint-Jean (Sint-Jans-Molenbeek).