Quote from @Max Emory: Hey @Joe Steinheiser, once you have more than a few properties, you'll want to consider software.

My clients use Quickbooks online.

Honestly, for a great online resource would be https://www.accountingcoach.com/.

@Jules Aton we agree with Account ClosedA reputable PMC should be using Property Management software to properly manage rentals.Every PMC sofware we've looked at has built-in accounting with the ability to generate invoices.

a dedicated software?

You don't need any software to get started.

I think with more systems and software to come in the future (some of which have not been invented yet) realtors will become a thing of the past.

What software/platform is best for managing finances for investors?

I am using QB online service now.  

Get a property management system that is API connected (software connected) to both Airbnb and VRBO (and Google Vacation, booking.com, etc)That will become the mitochondria of the business. any update you make in the PMS will reflect in your listing for the other platforms (channel manager).Each of the booking platforms have different fees collected so you'll adjust the management fee in the system so that you get a similar payout.I use JURNY, a little known system that's I've used for 2 years to manage nearly 20 properties. but I love it because it connects to Autohost so I get automated leases sent out for signature (yes, even on Airbnb and VRBO) along with ID collection, SELFIE, credit card deposit and then the AI tool kicks in and detects for fraud.