# How is the reference rent calculated? ### How is the reference rent calculated?

Rule of calculation IRL is calculated based on the average, over the last 12 months, of the change in consumer prices excluding tobacco and rents. This index applies without it being necessary to sign an amendment to the lease.

### How to calculate the monthly base of a rent?

The monthly basis. Here, the principle consists in adjusting the daily amount of the rent according to the number of days of the month. We divide the amount of the rent by the number of days of the month, in order to obtain a daily price. The number of days occupied is then multiplied by the price of the daily rent.

### How to calculate the annual rent of a lessor?

In our example, the annual rent is therefore 500 x €. The monthly result for the lessor is different depending on the month, as well as for the incoming tenant, whose rent depends on the number of days remaining.

### How to calculate a tenant’s rent?

When a tenant moves in or moves out during the month, the amount of the rent depends on the time the premises are occupied. Since months and years do not have the same number of days, the calculation can be complicated.

### How to calculate the rent amounts for outgoing and incoming tenants?

We are going to calculate the rent amounts for outgoing and incoming tenants: The monthly basis. Here, the principle consists in adjusting the daily amount of the rent according to the number of days of the month. We divide the amount of the rent by the number of days of the month, in order to obtain a daily price.