Monthly living expenses with a child

but should I forbid him as long as the school grades are good?

Would he then also receive less luxury if the school grades are not good?

Good grades = good money, bad grades = less money?!

There is no good or bad money with us. But you are right, if he were to get worse at school out of laziness, one would have to think about his further path in life, and then maybe he should start an apprenticeship instead of school. But bad grades can have many reasons and cutting money across the board is the wrong way.

Could you please fill in your place of residence?
I would like to check if your child shouldn't be hired as a salesperson right away. Anyone who already squeezes 1/3 of the free resources out of their father has no problems getting that through with the customer. The boy needs to become really good at the job.

maybe he should start an apprenticeship instead of school after all

Does he do it because you want him to, or because he realizes it himself? After all your posts, it seems, as already mentioned, more like your son is controlled by others and makes fewer decisions on his own. Personal effort can also help here: to become more independent and to explore what one expects from their own life.

Does your son actually get 1/3 of your salary after fixed costs? Because anything else would be unfair.

Does he do it because you want him to, or because he realizes it himself? After all your posts, as already mentioned, it seems more like your son is being controlled by others and makes fewer independent decisions. Personal effort can help with this: becoming more independent and exploring what one expects from their own life.

Does your son actually receive 1/3 of your salary after fixed costs? Because anything else would be unfair.

He is fully independent now, I can't understand where you see him being controlled by others.
It is probably like that with you and now you are projecting it onto others.

Sometimes it seems to me that some people here are jealous that there are families where everything is harmonious and equal.

Change yourselves then it can be like that for you too.

I really can't calm down here anymore... so brilliant....

I will soon divide our net income after fixed costs by four and let my boys, aged 1.5 and 3 years, go wild... This will be a blast...
Sorry Albert, but you really live far from any reality. Your son (by the way, apparently an only child according to the stereotypes) already makes me feel sorry for him when he lives outside of home for the first time and tries to manage on his own. I hope he has someone nearby who irons his clothes, cleans the toilet, does the shopping for him, and makes his sandwiches...
That had to come out now.