Rent indexation in Flanders in 2025
Month by month, the health index a landlord in Flanders uses for a lease anniversary in 2025, and the regional rule that applies on top.
| Anniversary month | Index month to use | Health index (base 2013) | Over 12 months |
|---|---|---|---|
| January 2025 | December 2024 | 133.73 | +3.24 % |
| February 2025 | January 2025 | 135.52 | +4.09 % |
| March 2025 | February 2025 | 135.79 | +3.70 % |
| April 2025 | March 2025 | 135.91 | +3.16 % |
| May 2025 | April 2025 | 134.77 | +3.00 % |
| June 2025 | May 2025 | 134.54 | +2.37 % |
| July 2025 | June 2025 | 135.04 | +2.37 % |
| August 2025 | July 2025 | 135.60 | +2.08 % |
| September 2025 | August 2025 | 135.64 | +2.03 % |
| October 2025 | September 2025 | 135.26 | +2.15 % |
| November 2025 | October 2025 | 135.76 | +2.11 % |
| December 2025 | November 2025 | 136.49 | +2.45 % |
Months missing at the end of the table are those whose index Statbel has not published yet. Figures read on September 30, 2026.
Same year, other regions:
The rule in Flanders
The energy-performance corrections below depend on the anniversary month; open a month of 2025 above for its exact factors.
Between 01/10/2022 and 30/09/2023 Flanders indexed label D at 50 % and E/F not at all, and forbids catching up afterwards (decree of 3 October 2022, art. 4). Every later indexation is multiplied by a factor built from the health index of that frozen year. For a lease whose anniversary falls in this month:
Indexed in full, on the formula above. The only conditions left are the national ones: a registered lease, a certificate handed to the tenant, a written request.
Your rent, your dates, the exact figure
The free calculator applies the formula, the regional correction and the three-month cap to your lease, and emails you the letter to send.
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