Have a spreadsheet on your home computer with the info you need.You can even password protect the file.

There's a nominal fee for filing as a foreign entity doing business in SC (a couple hundred $$ I think).

KBKG also offers FREE audit support and FREE use of their 481(a) depreciation software which produces the attachment schedules that are needed to file the IRS Form 3115.

KBKG also offers FREE audit support and FREE use of their 481(a) depreciation software which produces the attachment schedules that are needed to file the IRS Form 3115.

The amortization and terms as easily shown in a single excel file.

If I want to add another one do I start by filing a permit for another septic tank with the city?

You can try filing noise complaints or even a nuisance lawsuit, but whether that will help depends a lot on whether the next door property is inhabited by the owner (less chance of chance, more chance of poor attitude) or a renter.  

I paid the $4600 for new unit (labor and materials), didn't file a claim since it might cause my insurance premium to go up. 

After filing with the court, the tenant sent me a partial payment via CashApp.

We held as primary for a year and STR for 2 years filing the appropriate tax declarations/forms etc. during each stage.