You’re moving in with your best friend, someone from work, or even a stranger you met through an online ad. The rent fits into your budget, and the place you’ll be sharing is close to everything. There are a few financial matters you may want to settle before move-in day, however: Your monthly expenses include more than rent—think of utilities, food, and household necessities. Hammering out who will bear what costs before you move in together could avoid conflict down the road....