He can rightfully ask for 50% of equity since the time you two got married regardless of what payments who made or whose money was put into the house. However he would also be responsible for 50% of any debts against the house during that time also. You are also entitled therefore to 50% of the equity in his condo since the date you both got married. You would both need to refinance if you can't pay each other off without doing so. Sounds to me like a bargaining chip - tell him to leave yours alone and you'll leave his alone, otherwise your both going to be spending money for appraisals & more attorney fees. He can't take the equity from the two years you had previous to getting married, but it will be a pain to have to split up the equity into the three seperate years, especially noting that there has been improvements made to the home. MI is a 50/50 state, any debts & any property purchased during marriage is to be split evenly. Your income was his income and vice versa so it doesn't matter if you have receipts showing you paid 80%, unless your still paying that debt. Get to an attorney and file - don't let him push you into any corner and take everything that is being said as a bunch of crap unless your attorney tells you otherwise.