What is the minimum amount my employer must contribute to my commuting costs?

For each De Lijn travel ticket, this is at least 72%, although many employers contribute the full 100%.

For example:

An Omnipas is an annual subscription for an adult between 25 and 64 years old – and costs 499 euros. The minimum mandatory contribution from your employer is 359.28 euros. This means it will cost you a maximum of 139.72 euros … or just under 12 euros per month.