<prompt> Human: Update:Thanks for all the comments guys. Got a much clearer picture now.Two friends are moving into a house. 1 friend is buying and plans to stay longer term, other friend is renting a room and staying for a few years. 2 bedroom, 2 bathroom, sharing garage, extra rooms and other spaces.I am wondering what percent of the mortgagetax should each person pay?60 for the one buying the house?40 for the one renting ?What is common fair split in a case like this ?Update: not including Utils. Utils we plan to split 5050.  <response>: I am just telling you from experience. The person buying in this situation needs to look at this like I am buying a house, and my buddy is renting a room. The buyer is responsible for everything Because you really are, and will have to deal with the long term consequences if it is not fixed right. Also as a side note. Make sure that you agree to everything in writing FIRST. If you dont two years from now you are gonna look back and say that guy on Reddit was right! Now I am screwed and I lost a good friend!. 