Taking the inspiration from the post " How to buy a tax deed at the Fulton County Tax Sale, Atlanta, GA" by Dan M.  

like repairs/maintenance, PM fee, utilities, taxes, etc?

It saves 5% on the tax rate. 

@Taryn Hansen As this is a real estate site I’d have to say rent out the house and keep it and watch it appreciate in value while you earn solid cash flow and get tax benefits.

I think it MAY save some $ when it comes to tax time - I think we would have a lot more deductions possible to take, she could possibly have REP status.

Every accountant thinks that knowing the numbers and taxes is what makes a deal work.

Wondering if it's is more tax advantageous to use an S-Corp or a straight LLC for doing my flipping in?

DSCR also does not look at your income i.e. taxes, W-2, paystubs, etc but rather will look at the potential cashflow of the property. 

I have received a refund for a transaction that occurred in the previous tax year.Specifically, this transaction occurred in May 2023, but I received the refund for that amount in January 2024.

Is your DSCR ratio greater than 1-meaning are you cash flowing (according to the lender's criteria of mortgage, property taxes and insurance (and HOA) if applicable).