I'm also looking to also report it to credit bureaus so that it's on their rental history.

As for the down payment, I would make sure you always have some cash on the side lines for liquidity as lenders will want to see cash amounts outside of credit lines.

Do you work with any specialty tax firms to help us small business owners get access to R&D tax credits, cost segregation and other specialty tax credits?

Are they credit-worthy?

To sum up the risks to the seller; the seller remains liable on a note which is secured by real estate they no longer own; the property sale has violated the due on sale clause of the mortgage or deed of trust and the note can be accelerated by the lender; the seller’s credit capacity is impaired because he has debt with no offsetting property equity.  

You can really mess up the seller's credit if you miss payments and they can then sue you.4.

As long as you keep everything in a separate bank and credit card account, it should be fairly straightforward to track.

Is there a positive DSCR etc.).That being said, I'm curious to see what @Josiah W. can do with the 0% interest lines of credit.

DSCR loans are based off of down payment, credit score and either actual or market rents so it helps to supercharge an investor's real estate goals and net worth.

We would just need to verify you have a decent credit score and the rents can cover the total mortgage payment at that loan amount.