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Are my parents ripping me off with this deal that doesn't allow me to build my equity in my home?
Basically, you have purchased 25% of the condo for $40,000, and your parents bought 75% of the condo for another $115,000. We imagine for a moment that it wasn't you who lived in the condo, but some unrelated person paying rent.  You are paying $7,500 a year for tax and fees, plus $6,000 a year, so there is $13,500 leaving your wallet. If $15,500 a year was a reasonable rent, then the tax and fee would be paid out of that, there would be $8,000 left, of which you would get 25% = $2,000. If you were officially "renting" it, you would pay $15,500 a year, and get $2,000 back, again $13,500 leaving your wallet. So you are in exact the same situation financially as you would be if you paid $15,500 rent.   Question: Is $15,500 a year or $1,290 a month an appropriate rent for your condo? If a neighbour is renting his condo, is he or she paying $1,290 or more or less? Could you rent the same place for the same money? If $1,290 is the correct rent then you are fine. If the rent should be lower, then you are overpaying. If the rent should be higher, then you are making money.  Keep in mind that you will also be winning if rents go up in the future.