Seller Financing - CPA advice

[Dylan Miracle]

I have a potential deal that I'm working on, but the owner said that her CPA said it isn't advantageous to do a seller financing route. Can someone offer some advice from a CPA perspective? 

The deal has been on market for a very long time and we're looking to pay them on terms over the next few years, but I want to be able to justify why seller financing is advantageous. Thank you in advance!