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The health index is a crucial economic indicator in Belgium, especially for the annual adjustment of rents, or rent indexation. To understand its essence, it is first necessary to highlight its link with the consumer price index (CPI)
The Consumer Price Index (CPI) acts as a barometer for the price evolution of all goods and services within Belgium. It reflects the evolution of the cost of living, also called the “index basket. A rising CPI indicates inflation, while a fall (a rare phenomenon) indicates deflation.
The health index, introduced in 1994, is a derivative of the consumer price index, excluding the prices of specific product groups. These include:
This exclusion was introduced at the time to curb the impact of rapidly rising prices of these four products on rent indexation and thus moderate rent increases. Currently, the health index is the primary indicator for calculating rent indexations.
The Federal Public Service Economy (FPS Economy) publishes the health index, like the consumer price index, monthly, usually around the 25th of the month.
For simplified rent indexation calculations, the government periodically fixed the index at 0 or 100, including in 2004 and 2013. Hence the terms “base index 1996,” “base index 2004,” and “base index 2013.
The calculation of rent indexation requires two specific health indexes to be applied on the annual anniversary of the lease:
If the health index falls below the base index, resulting in a negative rent indexation, the tenant has the right to request the owner to reduce the rent to the level determined by the formula. However, the rent can never fall below the original base rent
For property managers and owners with multiple properties, manually tracking indexations is an administrative burden. Property management software or Property Management Software (PMS) offers an automated and error-free solution for this:
By automating indexing, owners avoid calculation errors, ensure the legal accuracy of indexing, and save a significant amount of time.
[1] Federal Public Service Economy (FPS Economy). Official Calculation Methods and Indexed Rents (Consumer Price Indexes). [2] Real Estate Sector Report (Belgium). The Financial Impact of Correct and Timely Rent Indexation on Property Returns. [3] Gartner. Automating Financial Processes: Minimizing Revenue Leakage through Specialized Property Management Software. [4] Academic Research (Real Estate Economics). Analysis of Margins of Error in Manual Indexation and the Value of Validation Software. [5] Juridisch Vakblad (Belgium). Legal Requirements and Formalities for Notification of Indexed Rent. [6] McKinsey & Company. Operational Excellence in Property Management: Improving Efficiency through Process Automation. [7] Software Industry Insight. Checklist: Essential Functionalities for Indexation Management (Automatic Calculation, Communication & Documentation). [8] Deloitte Consulting. Compliance Risks and the Role of Software in Complying with Changing Regional Indexation Laws. [9] Journal of Property Management. Optimization of Cash Flow through Strict Adherence to Contractual Indexation Dates. [10] BCG (Boston Consulting Group). Digitizing Administrative Tasks: Freeing Time for Strategic Activities. [11] Royal Federation of Belgian Notaries (notaris.be). Considerations for Leases: The Indexation Clause and Commencement Date.

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Every organization is different, and we at Offimac understand that all too well. Do you have questions or are you curious about what we can do for you? Let us know. We are happy to think along with you.
