How to split the rent when one of you earns more

When 50/50 stops sounding like fairness

Of all the financial conversations a couple faces when they move in together, splitting the rent seems like the simplest. Until you look at the other person's payslip. When one earns €1,400 net and the other €2,600, the friendly "let's just go halves" starts to smell off around the second or third month, almost always in silence, almost always on the part of the lower earner. Nobody wants to open that conversation, so the formula gets adopted by inertia and carries the rest with it: the lower earner reaches month-end with their account in the red, the higher earner doesn't understand why the other is in a bad mood on a Sunday afternoon, and the rent becomes a silent red flag.

In 2026, with average rent in many cities hovering around €1,100 or €1,200 for a couple's flat, the problem isn't theoretical. The difference between paying €600 on a €1,400 salary and paying €600 on a €2,600 salary isn't mathematical, it's existential. The first is putting 43% of their paycheck toward a roof. The second, 23%. And yet both live within the same walls, share the same tap and sleep in the same bed.

This article doesn't defend any of the three formulas you'll see below. It defends talking about them. The right formula is the one that survives a calm conversation at month-end, not the one that looks fair on paper.

Why splitting 50/50 cracks when there's a salary gap

The 50/50 springs from a noble intuition: we're a couple, we're equals, the expenses are too. The problem is that it confuses equality of rights with equality of financial capacity. If one person contributes 50% of a rent that represents 43% of their salary, and the other contributes the 50% that represents 23% of theirs, what looks like balance is, in reality, an unequal effort disguised as symmetry.

The other thing that cracks is what happens with the rest of the budget. The lower earner, after paying their half, arrives at the supermarket, the electricity bill, the Friday beers and the holidays with a much smaller margin. If 50/50 is also applied to each of those expenses, the asymmetry multiplies. The whole couple starts living at the pace of whoever can spend the least, which frustrates the higher earner, or at the pace of the higher earner, which suffocates the other. Both options are bad, and neither gets solved by looking at the rent alone.

Three formulas and when each one makes sense

1. Plain 50/50

It works in exactly one scenario: when the two salaries are reasonably similar. Reasonably means, say, a difference of less than 20% between net pay. If one earns €1,900 and the other €2,200, 50/50 is fine and simplifies life. No need to pull out the calculator.

The problem starts when that gap widens. It's common to see couples where one earns double the other and they keep up the 50/50 "out of habit" or "out of the lower earner's pride." One of the functions of talking about money as a couple is to protect the other person from their own pride too. There's nothing virtuous about paying the same half if it stops you from saving for ten years running.

2. The split proportional to salary

The most popular formula among those who decide to face the difference head-on. If one person provides 65% of the joint income, they pay 65% of the rent. Let's stick with the earlier example: €1,400 + €2,600 = €4,000 net a month. The one earning €1,400 represents 35%, the one earning €2,600 represents 65%. On a €1,200 rent, that's €420 and €780. Each one puts 30% of their salary toward a roof: symmetrical in effort, asymmetrical in figure.

This formula has an advantage that doesn't usually get mentioned: it makes the disposable surplus after the rent proportional to salary, not the entire salary. In other words, both can afford the same Friday beers without anyone doing weird mental math. And if the split is also applied to the rest of the shared expenses (groceries, electricity, internet), distributing the cents by largest remainder rather than by truncation so nobody always pays the rounding, the whole couple lives on the same level without the lower earner having to give anything up.

The downside: it requires updating the percentage when salaries change. A promotion, a job change, a leave of absence, a freelancer who has one steady month and another of three thousand euros. The proportional formula calls for review, ideally every six months, ideally sitting down with phones away. If that conversation makes you uncomfortable, the problem isn't the formula, it's the conversation.

3. The hybrid model: common base + extra from the higher earner

The third path, less famous but often the most sustainable: both contribute the same base (for example, 30% of their salary, or an absolute figure like €500 each) and the higher earner covers the gap up to the full rent. On the €1,200: each one puts in €500 (which for one is 36% of their salary and for the other 19%), and the higher earner covers the missing €200. Total: the lower earner pays €500, the higher earner pays €700.

It's a hybrid between 50/50 and proportional. It isn't as symmetrical in effort as pure proportional, but it protects the feeling that both are contributing something meaningful, not "pocket change next to the other's figure." For many couples it works better psychologically than strict proportional, especially when one of them is a freelancer and prefers to keep the sense of a steady contribution even though their months are irregular.

The downside: if the common base isn't quantified well, you can sneak in an asymmetry worse than the 50/50's. You have to sit down and do the math, not improvise it.

The invisible problem: the rest of the expenses

A couple that spends an evening discussing the rent and then pays for the supermarket, the electricity, the internet and the dinners out at 50/50 is applying two different logics to the same finances. The rent is usually the most visible fixed expense, so it centers the conversation, but it's rarely the only one that deserves a proportional split.

In fact, electricity, water and gas are the expenses where the asymmetry hurts less in absolute value but more in frequency: they show up every one or two months, generate bills nobody wants to open and lend themselves to silly arguments ("I'm hardly ever home," "I don't use the AC"). If the couple has decided on a proportional split for the rent, the consistent thing is to apply it to the whole catalog of household expenses, not just the headline one.

How to automate it without turning it into a spreadsheet

The great enemy of the proportional split isn't the formula, it's the maintenance. Keeping a monthly Excel sheet with percentages, amounts, dates and pending balances is exactly the kind of task a couple quietly lets slip by the second month. The reasonable thing is for a system to do that for you: for each shared expense to be split automatically with the agreed percentages, for the rounding of cents to be done by largest remainder and not always in the same person's favor, and for the outstanding balance to be visible at a glance without having to open the phone's calculator.

This is what a tool like ControlarGastos does: it lets you configure the split percentage between the members of the group, log expenses as you enter them (rent, groceries, electricity, subscriptions) and see at any moment who owes whom and how much, without either of you having to keep a parallel notebook. The conversation goes from "hang on, wait, I owe you forty-two fifty and..." to "let's settle up."

A conversation, not a formula

The three formulas work. None is objectively better than the others. What does objectively work worse is not talking about it and letting resentment pile up between the fridge and the laundry basket. The couples who handle money best aren't the ones who nail the first formula on the first try, they're the ones who allow themselves to change it without feeling they're renegotiating the love.

Choose the one that survives a calm conversation at month-end. If the conversation makes you uncomfortable, it isn't because of the formula. And if the conversation flows, almost any formula will do.