- how to manage project design documents, invoices, receipts to track 2-3 projects at a time- any other advice would be appreciated!  

I just set up an automated invoice to go out monthly and allow mailed checks or ACH deposits through quickbooks.

We just closed on our first flip and I have monstrous folder of receipts and invoices.

If they aren't paying in person, it is also a chance to see if they can manage to pay using our preferred method- a Quickbooks e mailed invoice- that way I know they can pay their rent that way too.There are some markets where landlords pay for background checks, so if you are in one of those then you should pay it. 

In any event, you cannot just arbitrarily pick a dollar amount to charge, you need to actually have an invoice for your expenditure, with notes as to findings by the person repairing (or clearing) the issue.

REIP would then invoice the management company every month.

All deductions must be accurate and you must have the supporting evidence such as invoices, receipts or other documentation that supports the deduction.E-file rather than mailingThis can help you reduce calculation errors, processing time and is proof that you filed your return on time.

* Are all my invoices uploaded to my owner portal?

How do I keep all invoices and bills organized on my first big development project?

The PM is refusing to provide us with original receipts and invoices from the vendor.