There's a specific moment a lot of couples know and don't talk about. You're splitting the bill, or settling up for the week's groceries, and you do the math in your head: I make less than they do, so 50/50 doesn't actually feel even. But saying that out loud feels like I'm keeping score.
So most people don't say it. They just keep splitting everything down the middle, and quietly, the person earning less ends up carrying a heavier share of their own income every month, while the person earning more never notices, because on paper, everything looks fair.
That gap between "equal" and "fair" is where a lot of money tension in relationships actually lives. Not in big dramatic fights about spending, but in the small, recurring math that nobody re-checks.
Search for this and you'll mostly land on two answers, and they come from two very different places.
Banks tell you to merge your accounts. Open a joint account, or use a shared "space" inside your existing app, put your income in, pay everything out of it. It's worth asking, though, why this is the default answer at all: it isn't really a considered recommendation, it's just the oldest product banks had to offer.
The joint account, as a financial default, comes from a very different era than the one most couples are actually living in now. For most of modern banking history, a married woman's financial identity was, in practice, absorbed into her husband's. In the UK, it wasn't until the Sex Discrimination Act of 1975 that a woman could open a bank account, get a credit card, or apply for a mortgage without a man's signature. Just fifty years ago. A joint account wasn't "the romantic choice" back then so much as it was often the only practical way a household's finances functioned, because the assumption baked into the system was one household, one financial identity, one primary earner. Banks kept offering that same product long after the household it was designed for stopped being the norm, and a lot of the advice you read now is really just inherited habit dressed up as a recommendation.
It's worth saying plainly: this isn't only a legacy-bank problem. Take Revolut, for instance. It markets itself as having rethought banking from the ground up, and on plenty of things, it has. But its joint account is, structurally, the same joint account banks have offered for decades, just with a nicer interface and a faster sign-up flow. Nobody's actually rebuilt the model, they've just redesigned it. A joint account with better app design is still a joint account. It still merges more than the bill you meant to split, still assumes both of you are ready to fully combine your finances, and still doesn't tell either of you what a fair contribution should be. Prettier onboarding doesn't change what happens once the money's actually in there.
None of which is a knock on Revolut as a bank, worth saying clearly, since Cino works perfectly well with a Revolut card, same as any other. It's a knock on the joint account specifically, whichever logo happens to be on it.
And younger couples across Europe seem to be quietly opting out. A 2025 survey of 4,000 people across the UK, France, Spain, and the Netherlands (by neobank bunq) found that 39% of UK couples aged 18 to 24 keep their finances completely separate: the highest rate in the countries surveyed, ahead of Spain (33%), France (29%), and the Netherlands (26%). It's not just a young-and-uncommitted pattern either: among UK 25 to 34 year-olds, only 17% keep everything in one joint account, with 26% running a hybrid setup instead, joint for the shared bills, separate for the rest. Separately, a UK survey by Be Clever With Your Cash found 56% of people wouldn't consider opening a joint account at all, with the top reasons being loss of control over their own money (51%) and, more seriously, the risk of financial abuse (30%, rising to 33% among women specifically). Full merging is looking less like the obvious default and more like one option among several, especially for the generation actually dealing with income gaps and non-linear careers.
None of which means a joint account is wrong. It just means it deserves to be chosen on purpose, not defaulted into because it's the only thing that's ever been offered. And "we have one account" and "we split our costs fairly" are not actually the same claim, and it's worth pulling those apart, because the gap between them is where a lot of couples end up stuck later.
First: a joint account solves visibility, not proportionality. Having one shared pot means you can both see where the money goes. It doesn't decide how much each of you should put into that pot in the first place. Someone still has to work out, and keep adjusting as raises and job changes happen, what a fair contribution looks like when the two of you don't earn the same. The account doesn't do that math. A person does, manually, the same as with any other method.
Second: it merges more than the bill you meant to split. Once money is sitting in a shared account, it stops being clearly "my rent contribution" or "your grocery money" and starts being, simply, ours, which is fine when a relationship is going well, and genuinely complicated when it isn't. It's a large part of why unwinding shared finances is one of the more painful, drawn-out parts of a separation: the account did its job of merging everything, including the parts you never meant to merge.
Third: it assumes both of you are ready, and at the same bank (or close to it). A joint account is a real financial and administrative commitment: not something most couples want to open six months into living together, and not something that works cleanly if you bank differently, or if one of you isn't ready to formally tie your finances to the other's yet. For a lot of couples, especially earlier on, what they actually need isn't a merged account, it's a fair way to split specific recurring costs while everything else stays separate.
Expense trackers take the opposite approach: keep your accounts separate, log what's spent, settle up later. Apps like Splitwise and Tricount do let you split a specific expense unevenly instead of a strict 50/50, 60/40, 70/30, whatever fits. That part's real. What's worth being precise about is that it's a manual choice on each individual expense, not a ratio the app remembers for you, so someone has to keep re-entering the same numbers every time, or the split quietly drifts back toward whatever's fastest to tap through.
And logging is still the whole model, ratio or not: someone has to remember to enter every coffee, every grocery run, every shared subscription renewal, or the numbers stop reflecting reality. At the end of the month, someone still owes someone money, and someone still has to send it, which means the awkward conversation about fairness doesn't go away, it just gets postponed to settle-up day.
Here's what's worth being honest about: this was never a math problem. If you earn €2,000 and your partner earns €3,000, working out that the split should be roughly 40/60 takes about ten seconds and no app at all. And yet you'll find a "fair split calculator" on nearly every banking blog and finance app out there, as if the thing standing between couples and financial peace was a missing decimal point. It isn't. Two people can do that arithmetic in the time it takes to read this sentence. What they usually can't do, easily, is say the number out loud.
Put two reasonable adults in a calm conversation and most of them can agree, in minutes, that 60/40 makes sense when incomes are meaningfully different. The hard part was never the arithmetic. It's everything underneath it that never gets said out loud, and no calculator, however polished, was ever going to touch that part.
Start with the person earning less. Bringing up the split first can feel like accusing your partner of something, or worse, like turning the relationship into a negotiation: the exact fear from the opening of this piece. So a lot of people don't bring it up. They absorb the gap quietly instead, month after month, and tell themselves it's not worth the conversation. It usually is worth the conversation; it just doesn't feel that way in the moment, because raising a fairness question in a relationship can feel less like asking for something reasonable and more like keeping score, which is a very different (and much less comfortable) thing to be doing with someone you love.
Then there's the person earning more, who often genuinely doesn't notice anything's wrong, because on paper, 50/50 looks fair. There's no visible signal that their partner is quietly stretched thinner every month for the same nominal contribution. This isn't usually selfishness; it's that fairness, done this way, is invisible by design. Nobody's forced to look at it.
Underneath both of those is something people rarely name: most of us didn't choose our instincts about who should pay for what. We inherited them, from watching our parents split things (or not split them at all), from cultural expectations about who "should" earn more, from a first relationship where a certain arrangement went badly or worked out well. Two people can walk into the same conversation about a 60/40 split carrying completely different, completely unexamined assumptions about what "fair" even means, and never realize that's what they're actually disagreeing about.
None of this shows up as a dramatic argument, usually. It shows up as a low hum of resentment that neither person can quite point to: the higher earner sensing distance without knowing why, the lower earner feeling both grateful and slightly diminished at once. That's the actual cost of leaving this unspoken, and it has very little to do with which app, if any, is doing the math.
It's worth saying directly: raising this isn't keeping score. Keeping score is quietly tracking who's ahead and holding it against the other person. Naming a fair split, once, calmly, and moving on, is the opposite of that. It's the thing that actually lets you stop counting. The conversation is usually smaller than it feels in your head beforehand; it's the imagined version of it that does most of the damage.
Cino sets the ratio once, and then gets out of the way.
You and your partner link your own debit cards: it works with any bank across the UK and Europe, high-street banks and neobanks alike, Revolut included. That matters more than it might seem: not every couple banks with the same institution, or even in the same country. If one of you is in the UK and the other's account is somewhere else in Europe, you can still split fairly without either of you switching banks. You choose your split once (50/50, 60/40, 70/30, whatever fits your actual situation) and you can change it any time your circumstances do. Then, whenever one of you pays for something shared, the group's card splits the cost at the moment of payment: each person's share comes out of their own account, automatically, in real time.
There's no ledger to keep, and there's nothing to top up. Your money stays exactly where it already is, in your own account, until the moment you actually spend it. Nobody has to remember to transfer funds into a shared pot before the weekly shop, and nothing sits parked in a third place doing nothing. No one is "owed" anything at the end of the month, because no one ever covered more than their share to begin with. The fairness isn't something you have to maintain, it's built into how the payment happens.
This isn't a subscription and it doesn't ask you to open a new account or merge your finances. It costs 20 cents per transaction, capped at €5 a month. After about 25 transactions, everything else that month is free.
Honestly, these aren't mutually exclusive, and it's worth saying that plainly, because a lot of couples land somewhere in between rather than picking just one.
A fully joint account makes sense if you've deliberately chosen to merge your financial life completely, not because it's the only option a bank ever offered you, but because you're both genuinely ready for "your money" and "my money" to stop being separate categories.
A joint account for specific big costs only, a mortgage, rent, a renovation, while keeping everything else separate, is also completely legitimate, and it's actually the more common pattern among younger couples, per the same research cited earlier. In that setup, the joint account handles the one or two large fixed costs you've deliberately chosen to merge, and something else handles everything smaller and more frequent.
That "something else" matters more than it sounds like it should, because using a joint account for daily spending comes with a step people don't think about until they're already stuck doing it: you have to top it up first. Someone has to transfer money in before either of you can actually spend it on a coffee or a grocery run, which means either you're both making regular manual transfers into a pot just to keep it funded, or you're parking a chunk of your paycheck in there permanently, at which point it stops being "the mortgage account" and quietly turns into the thing you were trying to avoid in the first place. A joint account works well for the one or two costs you fund it for deliberately. It works badly as a stand-in for the dozens of small, unplanned purchases a normal week actually involves.
Splitwise or Tricount make sense if you want a free, simple ledger for that "everything else" and don't mind the settling-up step, especially useful if your shared expenses are occasional rather than constant.
Cino makes sense if you want the fairness of a custom split on that day-to-day layer without becoming the person who has to track it, whether or not you also have a joint account for the bigger fixed costs. It's built for couples who are sharing a life without wanting to share every euro that touches it.
If that's you: Download Cino for free and set your split once. It'll do the math every time after that.
Is a 50/50 split still fair if we don't earn the same?
Not necessarily, and that's fine to say out loud. "Fair" and "equal" aren't the same thing when incomes are meaningfully different. A lot of couples find a proportional split, roughly matching each person's contribution to their income, feels more honest than splitting every bill straight down the middle.
What percentage should each partner pay, based on income?
There's no universal formula, but a common starting point is to divide each shared cost in the same ratio as your incomes: if one of you earns 60% of the household's combined income, that person covers roughly 60% of shared costs. Plenty of couples adjust from there based on savings goals, debt, or what actually feels workable.
Do we need a joint account to split fairly?
No. A joint account is one way to manage shared money, but it's not the only one, and it isn't required just to split bills proportionally. Expense trackers and apps like Cino let you split fairly while keeping your accounts, and your financial independence, completely separate.
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