and here is a link to the files for contracts: https://www.biggerpockets.com/files

Any taxes not owed, a seller merely file a tax return with the state, just like any other tax returns filed for extra taxes a government has with held. 

Since then, my cabins have tripled in value - worth easily $800K or more, and have produced $696,XXX in rents.  

Not sure if you can file a complaint and ask for this to be re-assessed.   

As far as your primary residence, if you have lived in it 2 out of the last 5 years, you should not have to pay taxes on capital gains (difference between what you paid for it & what you sold it for) up to $250,000 if you file your taxes as an individual and $500,000 if you file jointly with a spouse.Just a disclaimer, I am not a tax professional.

It wasn’t an issue of “underwriting does review a file until it was complete”.

There are also additional costs of operating and maintaining an LLC, like separate bank accounts, annual report filings, tax filings, etc.2.

Anything and everything that you can do to show others (and prove to them) that you have a talent for selecting properties and producing actual results.If you do that, people will take notice. 

If the seller files for bankruptcy, that will involve you in a legal proceeding.

You mentioned that you are not a W-2, but that is not the only status of income producing individuals.