The lease is in front of you. The rent is one number. And at no point has either of you said out loud how that number is going to be divided — because it seemed obvious, and because asking felt like a strange thing to do to somebody you are moving in with.
Here is the thing worth knowing before you sign. There are only two honest answers, both of them are reasonable, and the argument that arrives in month fourteen is almost never about which one you picked. It is about never having picked one.
The two answers
Equal. Split the rent down the middle. Simple, symmetrical, and easy to administer forever.
Proportional. Split it in proportion to what each of you takes home. Also simple, and it keeps the burden even rather than the dollar amount.
Neither is more romantic than the other. Neither is more correct. What is not reasonable is drifting — where one of you quietly believes you agreed one thing and the other quietly believes the opposite, and nobody finds out until somebody is annoyed.
The same rent, worked both ways
Numbers make this concrete in about thirty seconds, so here is one household.
Rent is $2,000. A takes home $4,500 a month, B takes home $3,000. Combined, that is $7,500.
- Equal: $1,000 each. That is 22% of A’s take-home and 33% of B’s.
- Proportional: A pays 4,500 ÷ 7,500 = 60%, which is $1,200. B pays 40%, which is $800. The two still add to $2,000.
- Under the proportional split, both of them are handing over 27% of their take-home — $1,200 of $4,500 and $800 of $3,000 are the same fraction.
That is the whole difference, in one table. Under the equal split, B feels the rent half again as hard as A does, every month, silently. Under the proportional split they feel it identically and A writes a bigger check.
Your numbers will differ and so may your answer. The point is not that one column wins. The point is that it becomes a decision somebody made out loud, with a date on it, rather than a default that one of you is quietly carrying.
The check that matters: whatever basis you pick, the two shares have to add back to the household total. If they do not, something has been counted twice or missed.
Then decide what else it applies to
Rent is the easy one because it arrives as a single number on a single date. Everything after it is where the drift actually happens.
Groceries. Utilities. The internet. Household supplies. The sofa. The vet. A vacation. Furniture for a room neither of you had before. Each one of those can follow the same ratio or not, and if you do not say which, you will discover the answer one item at a time over about a year — usually in a supermarket, usually when somebody is tired.
Write the list once. Put the basis beside each line. It takes ten minutes and it is the single highest-return ten minutes in the whole move.
The thing people forget: paying and owing are different
This one is quieter and it costs more.
Who pays a bill and whose name is on the account are two separate facts, and only one of them follows you around. The person whose name is on it is the one the company pursues, the one whose credit file may carry it, and the one still receiving letters about it long after anybody has moved.
So when you set the split, also write down whose name each account is in and whose card it actually comes off. Those are frequently different people, and autopay attached to one person’s card is the single easiest thing to forget and the single most annoying thing to unpick.
If every account is in one name, that person is carrying a quiet, invisible load that neither of you has acknowledged. Splitting them is not about fairness in the abstract — it is about both of you being able to call the internet company.
Agree what triggers a review
A proportional split is built on two numbers that change. A raise, a job loss, a move to part-time, a move at all — any of those quietly makes the agreed percentages wrong, and nobody notices, because the standing order does not care.
So at the same time you pick the basis, write down what triggers revisiting it. A job change. A raise above some amount. A renewal. An annual date. Any of those is fine. Having none is how an arrangement that was fair in March stops being fair by October while both of you are still describing it as the deal.
How to raise it without it being weird
Frame it as being for both of you, because it is. “Let’s write this down so neither of us has to remember it” has never started an argument. Being asked for money in a year, with no record, frequently has.
And if it comes out that you disagree — that one of you wants equal and the other wants proportional — that is a real disagreement and it is far better to have it now, once, with a calculator, than to have it implicitly every month for two years. Work the example above with your actual numbers and look at what each option costs each of you as a share of take-home. The numbers settle it surprisingly often, without anybody having to win.
When this is not a splitting problem
Worth saying plainly. If the rent is unaffordable on the combined income under either column, no basis fixes that, and treating a structural problem as an arithmetic problem is how people end up feeling ashamed about a spreadsheet. The counting tells you which one you have, which is most of its value.
And if money is being used as a way to control or punish, this is the wrong tool entirely. There are specific services for that, and a worksheet is the least important part of what you need.
Write it down while you still agree
If you would rather not build that record yourself, we made one. The Shared Address is a 24-page printable workbook for two people moving in together, built on the Three Circles — what stays yours, what stays theirs, and the small category in the middle that nobody writes down. Eight fill-in worksheets, including the Split Sheet this article is really about, the Household Accounts page, the lease position, and the one page nobody wants to write. There’s a free five-page sample if you want to see the method first.
Handbook House guides are educational materials for organizing your own records. This article is not legal, tax or financial advice, and it does not tell you what you can afford or what your lease or your state requires — those differ by jurisdiction and change without notice. Where real money or a long lease is involved, have somebody qualified look at what you have written before you both rely on it.