I wonder why in a partnership you always have to calculate in percentages? You can separate things analogously to a marriage, what each person brought in, inherited, or received as a gift. But dividing the ongoing expenses during a partnership would be too exhausting for me. Who paid for which shopping trip, who paid for the last cinema visit, etc. We pooled our incomes when we moved in together at the latest, and even before that, I sponsored quite a lot because my wife was still studying at that time.
Extreme example He: investment banker She: hairdresser Both work 40 hours, so they do the same work but are paid differently. How is the vacation handled? He flies alone to Bali and she goes to the Mecklenburg Lake District? Or do both vacation in Meck-Pomm because she can no longer afford more? When children come into play, is the next quarry lake the only vacation destination because her budget for herself and half for the children does not allow for more? Does he have to contribute more household money because he eats more?
Questions upon questions that no one has to answer me.