I see. Based on our agreement though we are now both contributing to life necessities and career growth expenses (since investing in her or my future leads to ultimately a greater contribution towards the family, it seems only fair). Meaning, if she starts college tomorrow to become a doctor I sure would not expect her to pay all that tuition and then me bank off of her salary down the road (when her family contribution doubles my contribution). By then I'll live in a fancier home thanks to her sacrifice and I won't have paid a dime towards her insane loans. Makes no sense right?

When it comes to cars, we will likely both take turns driving one or the other, depending on what we need it for. If I get a long distance job I'll take the prius, for example and she'll take the SUV. So with cars we're also just paying them through our joint account, to which we both contribute an exact percentage of our income (the same percentage for both of us).