Risks of undeclared payments, in addition to a 4,000 euro fine: ‘How do you prove something without an invoice?’ | Money

It is not allowed, but it does happen: paying someone undeclared can easily save 9 to 21 percent on the bill. You pay a price for that advantage when the tax authorities show up on your doorstep, or as soon as disagreements arise or accidents occur. Experts about the risks: “You can try to recover the damage from the person himself. But if they don’t have the resources, it will be difficult. There is little to gain from a bald chicken.”