Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Are my parents ripping me off with this deal that doesn't allow me to build my equity in my home?
First, I don't think your parents are ripping you off, but you should get your agreement in writing. The fact that you never own more than 25% doesn't matter. If the condo's value is increasing, you are in fact building equity. Your share of the equity just doesn't increase, but it doesn't decrease either. For example, if the condo is worth $300,000 now, you have $75,000 in equity. Of course if the value is decreasing, so is your equity. If you are paying $500/month in interest (as OP clarified above), and you don't have a written agreement, you are probably unable to claim that payment as mortgage interest if you itemize your deductions on U.S. federal or state tax returns, thus you may be losing out on a legal tax deduction (assuming you earn enough to itemize). They will need to give you each year the proper IRS form for mortgage interest (Form 1098). And, they have to claim the $500/month as interest income on their tax returns. Having a written and signed contract eliminates confusion and potential for heartbreaking misunderstanding the future--and it sounds like you are already experiencing some doubt and confusion now. Your rate seems within market rates for an interest-only loan. Let's say you wanted to buy out your parents' share of the condo right now. Would you pay $115,000 or would you have to get an appraisal to find out what the condo is worth now? If you can't answer that question, you need to get that in writing so that you won't have an argument over it someday. If the condo has appreciated significantly and all you have to pay is the $115,000, then that's a sweet deal for you, because you'd be buying out a much more valuable property for much less than it's worth. If that is the agreement, and the property is appreciating (no guarantee, especially with condos), then you are essentially building equity. If the property is declining in value and you do wish to sell it, then you won't have to pay $115,000; they'll just end up with their 75% share, which will be less than the $115K they invested. Both of you would lose some of your investment, but you would have had all the benefits of living in a nice condo all those years and they wouldn't. They are definitely taking more risk than you are. Second, if you had $40,000 cash saved up, your parents probably raised you with some good financial sense and work ethic, so I'm optimistic they have good intentions for your future. Operate from that frame of mind when you go to ask for a written agreement. Next, read up about Equity Share Agreements. There are many models that will help inform your decisions. But, you should engage a real estate lawyer to help you draw up a fair agreement for both parties.  I was in an equity share agreement for my first townhouse. It's a common practice, and it won't cost all that much to get one created. It's worth the money to get it done properly.