Alice marries Bob under the community of property ("communauté de biens") regime.
Alice brings in 100k€, Bob 50k€. Or it can be a joint possessed ("indivision") 150 k€ house, 100k€ of which belongs to Alice, 50k€ to Bob. I assume it makes no difference.
They break up. Due to the community of property, they should both get 75k€. Does it have to be 50/50 in any case or is it more like a "default" split and people may share differently if they agree or if lawyers/judge say so?
Case 1 - Friendly break-up: They agree on a 100k - 50k share. Is this feasible? Or is it considered a gift ("donation") of 25k€ from Bob to Alice, and taxed as such.
Case 2 - Unfriendly break-up: Bob want 75k€ - 75k€. Alice wants to get back her 100 k€. Does it have to be 50/50, or can Alice's lawyer argue that she brought in 100 k€ and should get them back? Does it matter how long between the marriage and the break-up? I imagine a break-up after a few months could be considered bad faith from Bob, for instance.