* Are all my invoices uploaded to my owner portal?

This should be treated as a repair expense for the property.In both scenarios, you should maintain detailed records of the insurance claim, including receipts, invoices, and any correspondence with the insurance company.

However, the specific tax treatment can depend on the accounting method you use for your business.There are two common accounting methods for small businesses:Cash Basis:Expenses are deducted in the year they are paid.If you are on a cash basis, you can generally deduct the expenses for the heating and air system in the year you made the payment, even if the property is not yet in service.Accrual Basis:Expenses are deducted in the year they are incurred, regardless of when they are paid.If you are on an accrual basis, you may be able to deduct the expenses in the year they were incurred, even if not paid.In either case, it's important to keep detailed records of your expenses, including receipts and invoices, to support your deductions.Please note that tax laws can be complex and subject to change, and the information provided here is for general guidance.

I don't really care to see my vendor invoices or background check / credit reports, but I want to make sure that they are not cheating me (e.g. tagging on additional fees to vendor invoices, forgetting to run the full background check).

On the other hand, I have copies of the old service invoices from the previous owners and I would like to replace as many of the trouble areas as possible to help avoid on-going service calls for known issues.  

If the plumber will put it on his invoice that there is no way that this is residual matter from before our lease agreement says that this is the tenants expense.I would talk with the plumber about reducing the $600 bill because it looks like he may have inflated it because he was angry.  

because the subs in new construction each tend to do a specific thing.. have companies up and running are professional SUCCESSFUL and can carry a tune  or I mean a Job so that they only get paid once a month.. invoice in by the 25th paid on the 10Th and lien release from last draw or no next draw.. we need lien release to get early issue title insurance..

IRS audits you and ask for backup invoices for the expense.

You might just ask the contractor for the invoice from the window place.Rotted framing around the windows is a son of a -----, windows have been quite the money sink in rentals for me in the past.

It is not as easy easy to predict as sales price but there's no disputing what the net is after the deal is done. as-long as both parties can review the final closing statement, the contractor invoices and the financials there's not much room for argument.