I believe that your calculation is is too simplistic and could cause problems later
EG property $500,000 Deposit $100,000 = 20%
But when you take repayments over say 25 years and both people have submitted 50% each = $186,500 interest
So forgetting the incidental costs, partner 1 has paid 286,000 and partner 2 has paid 186,000
And partner 1 has not had any interest on the deposit which he paid over the 20 years which would have been about $42,000
So there are other ways of looking at the problem, depending on the purchase price and length of loan
Another way of doing it would be to lower the deposit to say 10% and have partner 2 pay extra payments to partner 1 to repay half of that deposit and then it is a simple 50 / 50 in everything. the KIS system "Keep it Simple Stupid"
