Deductible only if advertising
You must demonstrate the advertising nature of your sponsorship expenditure.
If the sponsor is a taxable person, he must charge 21% VAT (a proper invoice is required). If the sponsor is not a taxable person, ask for a receipt showing at least the amount paid for the sponsorship and the following information about the sponsor:
full name (individual, non-profit organization or company)
address
national or company number
This information is useful for drawing up a 281.50 form, necessary for the expense to be deductible in the head of your activity or company (the administration wants to make sure that the sponsored person declares this income on his side).
💡 Keep a record of the advertisement - it must be clearly visible.