If work is not done by the contractors stated day I deduct $100 dollars a day from the final invoice.

Each and every one of these can be verified from actual invoices or county records as the case may be.

You are obligated for fulfilling the terms of your lease but the landlord must state if your security deposit was used - in writing.I just sent two letters to tenants with invoices attached return receipt requested.

Are all my invoices uploaded to my owner portal?

My other tenant pays through invoicing in QuickBooks.

I performed the walk through with them, pointed out a handful of problems and told them that I would have those things repaired within a week and mail them their check along with a copy of all of my invoices.

The reason of that split is because I would like to make sure each tenant doesn't feel getting ripped off (which the smaller unit may think so if they pay 50%).So each month I will advise them how much the gas cost it is going to be, and add to the monthly rent invoices that are sent out.  

You have them each fill out a W-9 and have them invoice you for the work performed.

Contractor omitted key areas of work when he submitted his initial invoice.  

The software sends the tenant an invoice and they just click pay and it sends an eft from their bank account to mine.