This will increase your filing fees significantly versus just your normal personal return Depending on the level of personal services provided during the tenants stay you will report it as self employment income versus passive income.  

You can make interest free payments from 6-12 months depending on how much you spend.

It's hard to beat a match for the 401k, but depending on your situation ROTH 401k's are great opportunities. 

The "it" factor varies but it usually is always with some ability to manage stress better than their relative peers.

That comes with some risk depending on the borrowers.

When it comes to financing your next property, both a Home Equity Line of Credit (HELOC) and cash-out refinance are viable options that use the equity in your property as leverage.Your decision of the 4 options would depend heavily on risk tolerance.

Unless the QCD is being recorded in a state like PA, where they impute a value for the property that approximates FMV, and they set real estate transfer taxes (between 2% and 4% of "value" depending on county) based on that imputed FMV.

Those vary widely, so you just have to crunch the numbers when the time comes.I have spreadsheets I've created myself to do all this for me by just plugging in numbers.

These were largely sourced pre-CV19, so eat the fish and spit out the bones.The DTI percentage range varies by lender, and is less than what you will find for an owner occupied property, due to lender risk.

Rental per room will be always more profitable than as a whole, depending on the market of course (rural vs urban) check local listings for comps.