Hi Corey,
So I'm not your accountant or legal advisor here... and people may not like what I'm going to say. It may not "technically" be the best practice.
But I've been accepting Venmo & other forms of online payments that go into personal accounts for 10 years now from dozens of tenants.
I simply have a spreadsheet that I update a couple times a month. Typing out EVERY SINGLE income and expense in my life, personal or business. And I label them as such. Personal Item, Rent Income, Rent Expense, Flip Expense, etc.
I have a personal bank account, two LLC's each having a bank account, about 10 credit cards with 2 of them being business cards.
And guess what?!? Personal and Business transactions run through ALL of them.
So people can start bashing on me for this, but I don't see a significant problem and haven't had one.
My thought is that if the IRS audits me, I'm perfectly capable of showing how "Joe Smith" paid my venmo $1K, I transferred it to my personal account, I also have a lease agreement identifying that $1K and Joe Smith's name. I've labeled it Rent Income on my spreadsheet and it matches to my Tax Return details of Income/Expense. As long as the IRS can track it and see I'm not hiding anything, recording it and paying the appropriate tax, I doubt they would have an issue...
Additionally, over the years I have re-financed over 10 properties with local banks. Yes, they ask for Rent Rolls, Bank Account balances, etc. But not once have I ever had an issue with how I accept, move and track this stuff. I could see some banks not liking it... but I've dealt with 4 or 5 now and it hasn't been an issue.
So... I'm sticking with my standard practice for now.