How to Split Household Supplies With Roommates

You moved in three weeks ago and you’ve already bought toilet paper twice. Your roommate has bought it zero times. Same with the dish soap, the trash bags, and that one weird sponge nobody picked but everyone uses. This is the silent tax of living with people, and it adds up fast.

The fair way to split household supplies with roommates is to either rotate purchases on a schedule, pool a small monthly fund, or assign categories so each person owns specific items. Pick one system, write it down, and stick to it for at least a month before changing anything.

What counts as a shared household supply?

Anyone can use it, no one can hide it. That’s the test.

Toilet paper, paper towels, dish soap, hand soap, dishwasher pods, laundry detergent (if you share a machine), trash bags, sponges, all-purpose cleaner, toilet bowl cleaner, foil, plastic wrap, salt and pepper, cooking oil. Maybe coffee filters. That’s the core list.

What’s not on it: shampoo, body wash, your specific skincare, your specific brand of anything. If only you use it, only you buy it.

If you haven’t agreed on a list, you haven’t agreed on anything. Sit down for fifteen minutes and write it out. The list itself is half the battle.

Three systems that actually work

The rotation. Everyone takes a month. June is on you, July is on them, August rotates again. Whoever’s “on” buys whatever runs out. Cheap to set up, no math, but it falls apart if your roommate’s month happens to fall during finals and nothing gets replaced. Good for two people. Gets messy with three or more.

The pool. Everyone Venmos $15 to one person at the start of the month. That person buys everything and posts receipts in the group chat. Rotate who holds the pot every quarter. This is the cleanest system if you trust each other and someone is willing to be the buyer.

Category ownership. You own paper goods, they own cleaning products, the third roommate owns kitchen supplies. Roughly equal in cost. You buy what’s in your category whenever it runs out. The advantage: no waiting for someone else’s month. The downside: if your categories aren’t actually equal in cost, someone is quietly subsidizing the others.

How do you handle the freeloader who never buys anything?

Stop asking nicely and start tracking. Open a shared note in your phone — Notes app, Google Keep, whatever. Every time someone buys something on the shared list, they log the receipt total. At the end of the month, you total it up and even it out via Venmo.

This sounds petty. It’s not. It’s the thing that prevents you from quietly resenting your roommate for six months and then exploding over a $4 pack of sponges. Receipts in writing > vibes.

If they still don’t pay up, that’s a different conversation. For the script on that one, see how to ask a roommate to pay you back.

What about Costco runs and bulk buying?

Bulk is cheaper but only if you split it correctly. If one person fronts $80 for a Costco haul, they need to be paid back by the end of the day, not “whenever.” Take a photo of the receipt, send it to the group, request the split on Venmo. Done.

Avoid the trap of “I’ll just buy the big pack and we’ll figure it out later.” Later never arrives. Later is how someone ends up $200 in the hole over six months of “later.”

If one roommate has a Costco membership and the others don’t, factor that in. Either they get a small premium for being the buyer, or everyone chips in $5 toward their membership fee. Make it explicit.

Things to avoid

Don’t buy the cheapest version of everything to “save money” without asking. Some people care a lot about which dish soap they use. A $2 jug of mystery brand soap that nobody likes is not a savings — it’s a small daily annoyance.

Don’t hoard your own private rolls of toilet paper in your bedroom while using the shared supply. Everyone sees this. It’s the most passive-aggressive move in the roommate handbook.

Don’t try to do the math in your head every month. Write it down or use an app. Memory is the enemy of fairness.

How homies handles this

homies lets you log shared purchases in seconds and auto-splits them across everyone in the house, so there’s no monthly receipt audit and no awkward Venmo request. Add the item, snap the receipt, and everyone sees what they owe. Bills, chores, and supplies in one place — instead of three group chats and a shared note that nobody updates.

rooming, minus the drama. Join the waitlist at joinhomies.app.