Offer your thoughts or opinion on the input financial query or topic using your financial background.

Money put down on home
You should have drafted a contract of purchase that stipulated out equity stake in the home based of his down payment and yours, along with future monthly payments.  But morally, if the house sells, yielding 100,000 profit (after fees/taxes/etc), you should get ( To Calculate Your Cut: (20,000 + Your Total Mortgage Payments Applied to Principle) / (1,900 + His Total Mortgage Payments Applied to Principle Only) * Profit on Sale of House After All Fees = Your Cut His would be: (1,900 + His Total Mortgage Payments Applied to Principle Only) / (20,000 + Your Total Mortgage Payments Applied to Principle) * Profit on Sale of House After All Fees = His Cut You'd then take mortgage payment totals for each; and calculate the payments made towards interest; and claim the correct amount each of you paid on payments for the mortgage interest deduction when you file your taxes. Although, depending on how the loan is written, the banks may issue 1099s which dont reflect actual payments made... Talk to an accountant.