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Rent Indexing
very easy to calculate following this official link:
http://statbel.fgov.be/en/statistics/figures/economy/consumer_price_inde...
the landlord can ask a max of three months in arrears in case he is late, anyway should be mentioned in your contract.
Your landlord is allowed to increase the rent on the anniversary of the start of the contract according to the official cost of living index proving it has risen by at least 2% since the start of the contract or the last rise. If it hasn't risen by 2% he has to wait until the next year. As R says, he can do so up to 3 months late if he forgets.