Cria Planner
Money
How to split money with your partner without keeping score
Nobody wants to be the person who remembers that they paid for the last four shops. The trick is not being more generous or more relaxed about it. The trick is having a system boring enough that neither of you has to remember anything.
Why this one matters more than it looks
Money arguments are not just unpleasant, they are unusually predictive. Researchers followed 4,574 couples and compared how often they disagreed about money, chores, in-laws, time together and sex. Financial disagreements were the strongest of those disagreement types at predicting divorce, for both partners (Dew, Britt & Huston, Family Relations, 2012).
The more useful finding is the second one. Once financial disagreements were accounted for, how much money the couple actually had stopped predicting divorce. And the thing driving the disagreements was a sense of unfairness rather than shortage. This is not really a story about being broke. It is a story about one person believing the split is not even, and the two of you having no shared record to check it against.
The problem is almost never the number. It is that only one of you is holding it.
The four ways couples actually do it
There is no correct one. There is the one you will both still be doing in a year, which is a different question.
1. Everything joint
One pot, both incomes in, all spending out. Simplest to run and the least compatible with very different incomes or a history that makes financial independence feel important. Works well when both incomes are similar and stable.
2. Fifty-fifty on shared costs
Each keeps their own money, shared costs split down the middle. Clean and easy to reason about. It quietly stops being fair the moment incomes diverge, because the same £400 is a very different share of two different pay packets. In the US, both partners now earn roughly the same in about a third of marriages, which means in the other two thirds an even split is not an even sacrifice (Pew Research Center, 2023).
3. Proportional to income
Each pays the same percentage of their income into the shared costs. If you earn 60% of the household total, you cover 60% of the bills. This is the one most couples land on eventually, because it survives a pay rise, a career break or a redundancy without anyone having to renegotiate under stress.
Do the sum once, write the two percentages down somewhere you will both find them, and revisit it when something changes rather than when somebody is annoyed.
4. Yours, mine and ours
A joint account for the shared life, a personal account each for everything else. Proportional contributions into the joint one. This is the hybrid, and it solves the specific problem of nobody wanting to justify a £9 coffee or a birthday present to the person receiving it.
The rule that makes any of them work
Whichever you pick: log the shared cost where you both can see it, at the moment it happens. Not in a spreadsheet somebody maintains. Not in your head, which is where resentment gets compounded daily at a terrible interest rate.
This matters because of how memory works when money is involved. Each of you can easily recall the things you paid for and has only a vague sense of the things your partner did, so both of you can walk around honestly believing you are carrying more. A shared record does not make anybody more generous. It just removes the argument's entire supply of raw material.
In Cria Planner: log a cost against the plan it belongs to, so the vet bill sits with the pets and the boiler service sits with the house, each budget in its own currency. Everyone in the plan sees the same running total. When you want to square up, a settle-up round works out who owes whom and ticks off each leg as it is paid, so a month of small things becomes one transfer instead of twelve.
Six things worth agreeing out loud
- What counts as shared. Rent and food, obviously. But also the pets, the car, the garden, the holiday. Decide once rather than case by case at the till.
- The number above which you mention it first. Not permission, just a heads-up. Pick a figure you both find slightly too low and you will never argue about a surprise purchase again.
- When you settle. Payday, or the first Sunday of the month. A fixed date beats "when it gets awkward", because by then it already is.
- Who pays the recurring things. Whoever has the direct debit keeps it. Balance it in the split rather than by shuffling accounts around.
- What happens when someone earns less for a while. Agree the principle now, while it is hypothetical and neither of you is the one it is happening to.
- That neither of you has to account for personal spending. Write this one down too. It is the clause that makes the rest of it feel survivable.
What not to do
Do not run a running tally in a chat thread. It has all the bookkeeping of an accounting system and none of the arithmetic, and the act of typing "you owe me 14" is doing something to the relationship that the 14 does not justify.
Do not split every individual item. A shop is a shop. Itemising who ate more of the cheese is the failure mode, not the solution.
And do not silently absorb it to keep the peace. That is the option that feels generous for about four months and then arrives all at once in an argument that appears to be about something else entirely.
Fifteen minutes, once
Sit down together. Pick one of the four models. List what counts as shared. Agree the mention-it-first number and a settle-up day. Put the two percentages somewhere you will both find them again. Then log things as they happen and stop thinking about it.
It is not romantic. Neither is discovering in year three that one of you has been quietly keeping score the whole time. If you want the wider version of this, the same logic applies to everything else a household has to remember, which is covered in keeping a household organized and in how a shared planner helps a relationship.
Stop keeping score in your head
Shared budgets that sit with the plans they belong to, and settle up in one round. Free to start, on iPhone, Android and the web.