How to split utility bills with roommates without a monthly argument

Rent is the easy part. Rent is one number, on one day, agreed before anyone moved in.

Bills are where shared houses actually go wrong. They arrive at different times, for different amounts, on different people’s accounts, and every single one carries a small unspoken question: did we all use this equally? Nobody asks it out loud. Everyone thinks it, most reliably in February, when the person with the electric heater is the only one who’s been warm.

Here’s a system that survives contact with real people.

Start by sorting bills into three piles

Not all household costs are the same kind of cost, and treating them identically is the root of most flatshare resentment.

Pile one: fixed and shared by everyone. Internet, TV licence, the streaming subscription, the standing charge portion of energy. The cost doesn’t change based on who’s home. One person watching Netflix costs exactly what four people watching Netflix costs.

Split these equally. Always. Don’t negotiate them.

Pile two: variable, and roughly tracks how many people live there. Electricity, gas, water. Four showers cost more than two. But — and this matters — the variation between roommates is usually much smaller than everyone imagines, and the effort of measuring it is enormous.

Split these equally too, with one exception we’ll get to.

Pile three: genuinely individual. Your own phone. Your own subscription. The parking permit for the car only you own. The pet.

Don’t split these at all. They should never enter the shared pot.

Most arguments are actually a pile-three cost that leaked into pile two, or a pile-one cost someone is trying to relitigate as pile two.

Why “equal” is usually right, even when it isn’t perfectly fair

This is the bit people resist, so here’s the honest case for it.

You could meter usage. Sub-meters, apps, spreadsheets of who was home which nights. People do this. It usually lasts six weeks.

The reason it fails isn’t laziness. It’s that the accuracy you gain is worth less than the relationship you spend to get it. Splitting an £84 electricity bill perfectly instead of equally might move £6 between two people. It also converts every hot shower into a transaction, and turns your housemate into someone who is counting.

The general rule: equal splits, unless the imbalance is large, obvious, and permanent. Small, occasional or arguable differences should be absorbed. It’s not that they don’t exist — it’s that noticing them costs more than they’re worth.

The four situations that genuinely justify an unequal split

There are real exceptions. These are them.

1. Rooms that aren’t comparable. Not a usage question but a rent question, and it deserves its own method — we’ve written up how to split rent when the rooms aren’t equal.

2. Someone is away for a substantial stretch. Not a weekend. A month-long trip, a term abroad, three weeks at their partner’s. Fixed costs (pile one) still split equally — the internet ran regardless. Variable costs (pile two) can reasonably be reduced. The simplest fair version: for the months they’re away, they pay their share of pile one and half their share of pile two. Agree it once, in advance, and apply it mechanically.

3. A single appliance with an obvious, large draw. The gaming PC that’s on eighteen hours a day. The space heater in one room. The chest freezer for one person’s meal prep. Note the test: obvious and large. A hairdryer doesn’t count.

The clean fix is a flat monthly surcharge rather than a percentage — “£12 a month for the heater” — because a percentage requires ongoing measurement and a flat number requires one conversation.

4. Different numbers of people per room. A couple sharing one room in a four-bed house is five people using the water and four people paying for it. Split variable bills per person, not per room. Fixed bills can stay per room, since the router doesn’t care.

Whose name is on the account

The most under-discussed risk in a shared house.

Whoever’s name is on the energy or broadband account is personally liable for it. Not “responsible in a group-chat sense” — legally on the hook, with it appearing on their credit file if it goes unpaid. If that’s you, you’re carrying a real risk on everyone else’s behalf, and you should be paid back promptly rather than eventually.

Three things worth doing:

• Spread the accounts. One person takes the broadband, another the energy, another the water. Nobody carries all of it, and everybody understands what it feels like to be owed.
• Log the bill the day it arrives, not the day it’s due. Late logging is how “we’ll sort it at the end of the month” becomes £400 outstanding.
• Never let a balance run past two cycles. If someone can’t pay this month’s, that’s a conversation to have now, at £70, and not in four months at £280.

If your provider offers it, splitting the direct debit across multiple accounts removes the problem entirely. Most don’t, which is why the rest of this exists.

The system, in four steps

1. One group for the house, and everyone is in it. Not a chat thread, not a note in someone’s phone. Chat threads scroll; balances don’t.

2. Whoever pays logs it immediately. This is the only rule that actually matters, and it’s the one that gets broken. Bill arrives, photograph it, done — with receipt scanning that’s about eight seconds, and the amount comes off the photo rather than out of your memory two weeks later.

3. Split by the pile it’s in. Equal for piles one and two, by shares or percentage for the four exceptions above, and pile three never gets logged at all.

4. Settle on a fixed day. Pick one — the 1st, or payday — and settle everything then. A good app works out the fewest payments needed to make everyone even, so four housemates with tangled balances end up making two transfers instead of six.

The date matters more than the method. Settling on a schedule means nobody ever has to ask, and “having to ask” is the thing that damages houseshares.

What to say when someone thinks it’s unfair

You’ll need this eventually, so here’s a version that works: “I don’t think we should try to be perfectly accurate — I think we should be predictable. Equal on everything, except [the specific thing], which we’ll do as a flat monthly amount. Fine with you?”

It works because it concedes the principle immediately, names one concrete exception instead of opening a general audit, and ends with a yes/no question rather than an invitation to debate. Almost everyone says yes.

What doesn’t work is the audit. The moment a house starts examining individual usage, everyone starts defending their own consumption, and you’ve turned your home into a small tribunal about showers.

Where Donget fits

Donget is a free app for exactly this: a house group, bills logged as they land, balances everyone can see without asking anyone.

• Unlimited expenses — a house generates a lot of them, and there’s no daily cap.
• Split equally, by shares, by percentage, by exact amounts or item by item.
• Free AI receipt scanning, so logging a bill is a photo.
• Everyone sees the same balances in realtime, which quietly ends the “I thought you paid that” genre of conversation.
• Settle up in the fewest possible payments.
• Free for every housemate, so nobody has to buy an app to pay you back.

More on the roommates use case page, and if rent itself is the sticking point, splitting rent and bills with roommates covers the whole picture.

The actual goal

Not perfect fairness. Perfect fairness isn’t available, and chasing it is how people end up not speaking.

The goal is that nobody has to keep score in their head. When the system is visible and the settle-up date is fixed, the electricity bill stops being a referendum on how everyone lives and goes back to being a bill.

Download Donget free and get your house’s bills onto one screen everybody can see.