Roommate Rental Agreement in Washington State 2021

[Michael Holtz]

Hi all, 

I am going to rent out a room in my home to a friend and I was wondering if I should have a roommate rental agreement?

Do you have a separate account for payments received? 

Do you prepare a statement for you and roommate to keep track of payments due and payments received? 

How do you claim rental income for future investment opportunities?

Thanks for taking the time to respond. =)

Mike