Current systems and tools:- Assistant to manage payments, invoices, ensure rents come in and chat with tenants for issues- Melio for vendor payments- Baselane for banking - separate accounts for each rental and deposit- Google sheets for Income and Expense reporting- Azibo for rent collection automation with late fee automations- Drive for my leases, SOPs, and documentations of tenants move in/move outGoals of improved system:  ensure I have a read out of how each property is preforming month over month, check on big expense items, ensure vendors get paid, mortgages get paid and rent is coming in, generate APY on float and savings for any big CapEx that comes up, and make my life easier come tax season.Is there a single software people use or what do you do for your business systems to optimize all of this?

On investor products we would be maxed at 75% depending on the documentation type / fico score for the borrower. 

Lenders who understand and specialize in such properties can be more flexible with their criteria.One approach is to ensure you provide comprehensive documentation on the property's potential and zoning specifics.

Under the IRS rules, a person  qualifies as a real estate professional if: (1) more than one-half of the personal services the taxpayer performs in trades or businesses during the tax year are in real property trades or businesses in which the taxpayer materially participates, AND.....(2) hours spent providing personal services in real property trades or businesses in which the taxpayer materially participates total more than 750 during the tax year.Like @Greg Scott and @Russell Brazil mentioned above, I don't believe that you would qualify as a REPS, but if you are going to try it, make sure you document it very well (i.e. with some kind of proof, like time cards, mileage forms, and/or receipts, etc.) so that just in case you do get audited, you at least have something to provide to the IRS agent. 

I'm also pretty active on IG (@Househackandhustle) where I document my journey and try to create helpful freebies.

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

We have been waiting for him to sign the addendum of the price update and provide some documents for the title all this time. 

All of which are well documented on the forums.

All states and counties are different, so you need to read through the county documents carefully and consult a local real estate lawyer.Some counties will only sell the tax debt. 

I care less about the payment process and more about communication, accounting, documentation, processes, etc.