Based on a quick answer from Perplexity it seems like there would be no issue with you buying the home and collecting passive income, but you may not be allowed to manage it yourself since that is considered active work.

The reason the answer is framed this way is because when you take a HELOC out to make repairs on your personal residence, you are allowed to tax the interest deduction on your Schedule A of your 1040 income tax return.

We’re fortunate to have an above-average income and live well below our means.This summer, we’ll be moving to Detroit (PCSing in August), and we’ve saved about $120,000 to invest in addition to having funds set aside for the home we’ll purchase in Detroit.The reason I’m posting is that I’m struggling to decide how to best allocate the $120k.

The majority have evictions on their record, don't make enough income or have a lot of debt under their name.Comparing other rentals on Zillow, my asking rent is $1100 while other properties are trying to rent at $1200.

I want to dispel the myth that laundromats are passive income.

I would suggest getting another full-time job for the time being and investing/doing STR on the side until you can fully and comfortably replace the income that you would be receiving from your job.Is your LTR in need of repair?

I am assuming that this means I can deduct interest paid to original lender and report the interest I received from buyer as income like Ashish mentioned? 

Unlike banks, which offer limited loan options, brokers have access to a wide network of lenders, including niche and non-traditional financing sources.Here’s what they do:Assess your financial situation to determine your borrowing power.Compare multiple loan products to find the most favorable terms.Negotiate rates and terms with lenders on your behalf.Guide you through the application process, ensuring you meet all requirements.Example: Suppose you have a lower credit score or unconventional income sources.

Also the ability to repay -  your source of income. 

This can put a significant strain on your finances and cash flowThey also often require a large down payment themselves and may have a strict repayment schedule that can be difficult to meet, especially if there are unforeseen circumstances or delays in renting the property or generating income from itIn addition, relying on this type of loan may expose you to higher financial stress and the possibility of default if you are unable to meet your loan obligationsThe final decision depends on your overall financial situation, risk tolerance, and your ability to manage the associated costs and obligations