I am a software developer and I authored our current software, so interfacing to their API is not really a big issue, but I am not sure if anyone is familiar witth the process of using an API, If you arent familiar with the good ol nitty gritty programming, you arent going to get very far before pulling out all your hair.

I have made an instruction sheet with an example for each taxing authority I remit to.

Hello Alberto,Thank you so much for this great and comprehensive response. 

When you put in the settings for state and local tax it should be clear what is collected and what needs to be remitted to each authority.

Tenantcloud is definitely more comprehensive and has more up-gradable features via reports and such, but the customer service experience is lacking.

Just be sure to clarify that she isn’t a leaseholder but is authorized to reside in the unit.If you’re concerned about liability or want more peace of mind, you could ask the primary applicant for additional security, such as a higher deposit, depending on what’s allowed under Colorado law. 

He is the foremost authority on Private money marketing.

Thank you for summarizing so much of the problems in a comprehensible way @AJ Wong

Also I am highly suspect of a company that would use an endorsement on their hope page of the controversial author Regina Jackson, whose claim to fame is hosting expensive workshops and writing books that claim all white people are racists. 

In the Bigger Pockets free book, "Real Estate Rewind", as one of the 11 co-authors I wrote about one such Tax Sale purchase and made money but not enough money to warrant the risk involved.