Good Question, and sure there is a risk that person A might feel like they contributing more as they are earning more but what u have in the joint account is managed money, so its a little different than person A having to pay the check each time and person B not realising that it adds up to alot as he/she has no visibility of your personal expenses. You working on a conmon goal and u can watch your net worth grow each month while u save for that house. Also the higher earner doesn't really feel like their salary belongs to them as its the disposable income that really counts. When u see the joint account balance grow each month from good budgeting i promise you that you'll both be smiling. I earn nearly double to what my wife earns and i let her balance the joint account each month to make sure that we've recorded all the joint expenses through the month. Of course she could take it all and run. Lol. But it was never about the money. Happy to answer any more questions.