Potential Debt Leveraging Idea

[Kayla Holbert]

I got this idea in my head, but I want to know if this is not only possible, but legal. So I was thinking of increasing my cash flow by allowing family/close associates to pay a portion of my mortgage, and in return give them 5%-10% more than that portion at the end of the year. Here's a very simple and exaggerated example:

I get 1000 in rent/month, but the mortgage on the house is 500/month. Instead of me paying the whole 500, I will allow someone to pay 20% of that, so 100, every month and give them 10% back at the end of the year.In total, they would have paid 1200 and I would have only paid 400 in mortgage every month, which means 4800 total instead of 6000. I would then give that person 10% more than what they paid, so 1320, which means I have to subtract it from my yearly cash flow of 7200, giving me only 5880. At first glance, this seems like I am losing money considering I could pay my full mortgage alone and pocket 6000 for the year rather that lose 120 dollars. But could this be considered a way to leverage debt? Technically, wouldn't I only be paying 120 dollars a year for a 1200 'loan'?. This may be a dumb question, but I had to ask anyway.