How to split utilities and groceries with roommates (not just rent)

Rent gets split on day one, in writing, usually on the lease itself. Everything else — the power bill, the wifi, the paper towels, the grocery run somebody did for the whole house — gets split by memory, and memory is a bad accountant. It rounds in favor of whoever is doing the remembering.

Pick one rule for utilities, once

Utilities are the easiest of the three to fix, because they are recurring and roughly equal every month. Split them evenly across everyone on the lease, whoever's name is on the account pays it and collects from the others by the same date every month. The only decision left is what counts: internet almost always does, streaming logins usually stay personal even when they run through the TV in the living room.

Groceries: the part that actually breaks

Shared groceries fail for a specific reason: two different things get called “the grocery money.” One is a genuine group run — toilet paper, dish soap, the eggs everyone eats — and the other is one person's weekly shop that happens to include a few shared items at the bottom of the cart. Treating both the same way is how one roommate ends up quietly subsidising another's diet.

• Keep a running list of what actually counts as shared: cleaning supplies, staples like coffee or toilet paper, and anything bought specifically for a group meal. Personal food is personal food, even if it is in the same cart.
• Settle on a schedule, not a vibe. Weekly or monthly, somebody adds up who paid for what and the difference gets paid across — not carried forward indefinitely as a favor.
• Whoever fronts a shared cost logs it the same day. The version of this that fails is “I'll remember,” three weeks and eleven receipts later.

The one roommate who is always owed something

In most houses, one person ends up fronting more than the others — they are the one with the card that works for the internet bill, or the one who does the Costco run. That is fine as a division of labor. It stops being fine the moment nobody is tracking what that person is actually owed, because the debt becomes invisible right up until it becomes an argument.

💡The fix is not a stricter rule, it is a visible number. Whoever fronted the money should be able to see, at a glance, exactly what each other roommate owes them today — not estimate it from memory the night rent is due.