To split shared expenses: agree first on what's shared and how it's divided (halves, in proportion to income, by shares or with exact amounts), log each expense as soon as it's paid and who paid it, and settle with as few payments as possible by simplifying crossed debts. What breaks the maths isn't the method: it's logging late.
Money fights between people who share expenses are almost never about an amount: they're about the feeling that one person puts in more, which nobody can confirm or deny because nobody kept track. This guide is the method to keep that feeling from showing up: what's shared and what isn't, the ways to split and when each one fits, and how to settle up without a night of rebuilding receipts.
Before splitting: what's shared and what isn't
Half the problems get solved with a ten-minute conversation at the start: which expenses belong to everyone and which belong to each person. Said out loud, not assumed.
- As a couple: rent, groceries, utilities and household things are usually shared; clothes, each person's nights out and gifts are personal.
- With roommates: rent, building fees, utilities, internet and cleaning supplies are shared; food depends on whether you cook together.
- On a trip: accommodation, transport and group meals are shared; souvenirs and what each person buys aren't.
The ways to split an expense
There's no single fair way for everything. There's a way that both of you (or all five) accept for each kind of expense:
- In equal parts: everyone pays the same. It's the simplest and causes the least argument when incomes are similar.
- By percentage: 60/40, 70/30, whatever proportion you agree on.
- In proportion to income: a percentage that comes from what each person earns. If one earns $1,200,000 and the other $800,000, out of $2,000,000 that's 60% and 40%.
- By shares: when one person has the big room, or someone ordered for two at dinner. One takes two shares and the rest one.
- With exact amounts: everyone pays what they consumed, for when the split follows no rule.
The method doesn't have to be the same for everything: rent can go in proportion to income and Saturday's dinner in equal parts.
- Split expenses with friends: who owes whomSplit expenses calculator: enter who paid what and it tells you who owes whom.
As a couple: halves, proportional or all together
Fifty-fifty is the easiest to keep track of and works well if you earn about the same. If the income gap is big, halves means one lives tight and the other comfortably while paying the same; there, splitting in proportion to income tends to feel fairer, because each person puts in the same effort rather than the same amount.
The third option is not splitting at all: pooling the money and tracking it together, to see where it goes rather than who owes whom. It works for couples who've already decided the money belongs to both; it doesn't work as a way to skip a conversation you haven't had.
- How to split household expenses with your partner without it becoming a thingSplitting household expenses as a couple: the three systems and their trade-offs.
- Couple expenses, clear and with no score-keepingCouples' expenses in Kesef: one group for the home, with the split you agree on or Everything shared.
With roommates: fixed costs, clear from day one
In a shared flat the risk isn't a dinner: it's rent and utilities, every month, for a year. Agree from the start how each fixed cost is split (if the rooms differ, by shares), who pays each bill and when you settle. Entering fixed costs once as recurring avoids the classic "who paid this month's electricity?".
- How to handle the bills in a shared flat with roommatesExpenses with roommates: what to agree on before moving in.
- Split the household bills without keeping score in your headShared expenses in Kesef: the group balance, up to date for everyone.
On a trip: a shared pot or everyone pays and you split
There are two systems. With a shared pot, everyone puts in the same money at the start, expenses come out of it and at the end you share what's left or top up what's missing. With "everyone pays and you split", whoever pays logs it and you do the maths at the end. The pot is simpler during the trip; the second is more flexible if not everyone joins everything.
On a trip abroad there's an extra problem: expenses in different currencies. Convert each expense at the exchange rate of the day it was paid, not at the end, or the numbers move on their own while you're working them out.
- How to split trip expenses with a group without anyone keeping scoreSplitting trip expenses without falling out.
- Track spending across currencies without doing the maths yourselfMulti-currency in Kesef: each expense in its currency, converted when you log it.
Settling up with few payments
When there are more than two of you, debts cross: you owe Ana, Ana owes Beto. Settling each debt separately takes two transfers; simplifying them takes one, from you to Beto, for the right amount. With five people and a whole trip, the difference is between three payments and fifteen.
And when someone pays you back what they owed, that isn't income: it's a settled debt. If you log it as income, your personal numbers for the month get inflated with money you had actually already spent.
The rule that brings the most order: log the expense the same day it's paid, with who paid it. Everything else can be fixed later; what wasn't logged can't.
Calculator, spreadsheet or app?
For a dinner or a weekend, a calculator is enough: enter who paid what and you're done. For what lasts (the home, the flat, a long trip with lots of people or several currencies) what you need is for everyone to see the same up-to-date balance, and a spreadsheet only one person updates doesn't do that. That's where a shared app makes the difference.
In Kesef, groups are free for everyone who joins, though you need the free account. Each expense can be split in equal parts, by percentage, by shares or with exact amounts; debt simplification is on by default and can be turned off per group; and there's a shared pot and Everything shared. You invite with a link or a code, and you can add someone by name before they install the app. Group statistics are part of Kesef Pro.
- Apps for splitting expenses: what to look for depending on who you share withApps for splitting expenses: what to look at before choosing one.
- Kesef or Splitwise: which one fits how you split expensesKesef vs Splitwise, point by point.
- Kesef or Tricount: split one trip, or track expenses all yearKesef vs Tricount, point by point.
- Splitwise alternatives for splitting expenses in 2026Splitwise alternatives.
- Tricount alternatives for splitting expenses in 2026Tricount alternatives.
Frequently asked questions
Is it fairer to split fifty-fifty or by what each person earns?
It depends on the income gap. If you earn about the same, halves is simple and fair. If one earns quite a bit more, splitting in proportion to income means each person puts in the same effort instead of the same amount. What matters is that you both agree.
How do you work out a split based on income?
Add up what each person earns and divide each income by the total. If one earns $1,200,000 and the other $800,000, the total is $2,000,000: the first pays 60% of each shared expense and the second 40%.
What does simplifying debts mean?
It means reducing the number of payments needed to settle up. If you owe Ana and Ana owes Beto the same amount, instead of two transfers you make one, from you to Beto. The end result for each person is the same.
How do we split if we pay in different currencies?
Convert each expense to a common currency at the exchange rate of the day it was paid, and keep the balance in that currency. If you convert everything at the end, the result depends on the day you do the maths.
Does everyone need the app?
To see the balance and log expenses, yes, each with the app and the free account. In Kesef you can start earlier: add someone by name, log expenses for them and invite them whenever you like; when they join they see everything from before.