In other words: invoices, checking statements, credit card statements, etc.

Upon accepting the booking/creating invoice, I use the calendar on my phone to set the second payment due date with a reminder.  

You will be required to have a licensed contractor to do the work and invoice for the funds that come from the 203K rehab monies.

Some PMs do markups on invoices anywhere from 5-15%.

Yesterday, they sent me an invoice with the price of installation $2,800, almost 6 times more of what I assumed.

@Cheyenne DavisNot sure about your area, but don't be surprised if the underwriter asks you to provide anything from a list of updates to actual invoices for products purchased for your flip, depending on the increased value from when you purchased. 

Jason, I get invoiced at the end of the month for all my ' marketing consultants' no need to get crazy with referral fees

Account ClosedYou are going to have $118,000 in basis in the property/land.Since this was done part of the sale of the house - the full amount($118,000) is calculated as part of the basis.However, an alternative way that may have been able to generate you more immediate write off would have been If you acquired the house for $111,000 and paid the roofer in invoices/installments of $2,500 or less.This method may have entitled you to a more immediate write off.

I use Excel pretty much exclusively but am getting the need for some supplemental software to keep track of Business Cards, Invoices, PM Reports, Receipts, etc...

It has amazing capabilities of sales process management, property management, Invoicing, Books and what not.