MB's calculator is a great tool, and also a very dangerous one if you dont know how to use it or are not familiar with how to use excel at a medium+ level.

So, landlords of exempt units don't even have to be concerned at all.   

I have done it successfully on my last 2 buildouts, maybe 3, but only because I was able to acquire the properties at a very low price and I did all the work in-house (myself and some hired hands on staff).

Unfortunately, Covid decided to change my plans, and I made the decision to hold off, in hindsight it was a huge mistake and no one could have imagined that property values could have increased at such a high rate.

It's a tax on the gain.How is this calculated?

Not in all cases but more often then not.Additionally you have to have solid management who is checking on the property at a minimum once per quarter as many times I find these tenant don't always report issues timely.  

When I have a rental that needs turned I text our cleaners and I'm on the schedule within 5-10 minutes.

This vary heavily town to town. 20% down is great if buying strictly as investment but if you have a way of owner occupying I would explore that route and apply the 20% down to increasing value of property and instead using low money down loan. 

Do you have a pool?

So whether you have a Carrot site or a Wordpress site, these things will matter to rank high on Google.