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How to split household expenses as a couple without fighting about it
Living with a partner means shared expenses: rent, groceries, utilities. Deciding how to split them is one of the most important money conversations you'll have, and getting it right avoids a lot of arguments.
Why 50/50 isn't always fair
Splitting every shared expense equally seems simplest, and it works fine when you both earn similar amounts. But if one of you earns twice as much as the other, a 50/50 split leaves the lower earner with much less breathing room by the end of the month, even though "you both paid the same" on paper. What actually matters isn't how much each person pays, but how much each person has left afterward.
The three most common methods
Equal split (50/50): each person contributes the same amount. Simplest, and works well with similar incomes. Proportional split: each person contributes a percentage of shared expenses proportional to what they earn, so you both keep a similar share of your free income. Custom split: you set each person's percentage yourselves, useful when other factors matter (one of you has more savings, one covers other costs separately, etc.).
How to calculate a proportional split
Add up your monthly net incomes. Work out what percentage of the total each of you earns. Apply that same percentage to the sum of your shared expenses (rent, utilities, groceries, etc.). For example, if one of you earns €2,600 and the other €1,800, the first contributes 59% of shared expenses and the second 41% — not the 50/50 split that might seem "natural" at first glance.
What counts as a shared expense
Reasonable to include: housing (rent or mortgage), utilities, household groceries, shared insurance. Usually left out: personal spending (clothes, individual leisure, your own subscriptions), unless you decide otherwise. Write the list together once, and revisit it whenever something significant changes (a raise, a child, a move).
What to do when incomes change
A new job, reduced hours, or parental leave changes one person's income. If you split proportionally, recalculating the percentage is quick — that's exactly the advantage of this method over a fixed 50/50. You don't need to wait for a crisis to talk about money: revisiting the split once a year, or whenever something big changes, avoids surprises.
Frequently asked questions
Is a proportional split better than 50/50?
It depends on your situation. If you earn similar amounts, 50/50 is simpler and doesn't change the outcome much. If there's a notable income gap, a proportional split usually feels fairer to both of you, because you each keep a similar share of your free income after paying.
Do we need a joint bank account to split expenses?
Not necessarily. Many couples split expenses without a joint account: each person pays their share of a given bill directly, or one pays upfront and the other transfers their share each month.
What if one of us has no income right now (studying, unemployed, on leave)?
A proportional split handles this well: if someone has no income, they contribute 0% temporarily, and the other covers 100% of shared expenses until the situation changes.
Should we split savings too, not just expenses?
That's a separate decision, and it can also be proportional to income or split equally, depending on what feels fair for your shared goals (a house down payment, a trip, a joint emergency fund).
Put it into practice
Enter your incomes and your monthly shared expense, and try all three split methods yourself: