A shared budget app for couples: what it actually needs to do
Sharing a password is not sharing a budget. It is one of you quietly stopping taking part.
In short
A shared budget between two people needs three things: each person signing in with their own login, shared costs divided in proportion to income rather than in half, and both able to see the total whenever they want without asking the other. One account with a shared password works until the first disagreement, because nobody knows who recorded what.
Almost every couple who keeps accounts together starts the same way: one person installs the app and the other occasionally asks how we are doing. That is not a shared budget, it is a budget with a spokesperson.
Why a shared password is not enough
Three problems turn up, always in this order.
The first is practical: if you both sign in as the same person, nobody can tell who recorded which expense. When something odd appears there is nobody to ask without it sounding like an accusation.
The second is about habit. The app has to be on each phone for recording to happen at the moment of spending. If it is only on one, the other has to remember in the evening, and does not.
The third weighs most: whoever does not keep the books stops taking part in decisions. Not out of bad faith — the information lives in one person's head, and the other cannot have an opinion without it. That gets charged for eventually.
How to divide shared costs
In proportion to income, not in half. If one earns 3,000 and the other 1,500, they put in two thirds and one third of the common pot.
Splitting the rent in half is not fair, it is symmetrical: it is twenty per cent of one income and sixty per cent of the other. With a proportional contribution both give up the same share of their life, and both keep money of their own that they owe nobody an account of.
The three possible models — everything together, everything separate, or the proportional pot — are compared in budgeting as a couple. This article is about the tool.
What the app has to be able to do
- One login per person, not a shared password.
- One budget both people see, with the same accounts, categories and transactions.
- Knowing whose each account is, so you can see who contributed and who spent without having to ask.
- Charging one subscription. An app that asks each of you to pay ends up used by one of you: nobody buys two subscriptions for one household.
- Splitting a one-off bill when you are out with friends and one person pays for everyone.
The two rules that prevent most of the arguments
Neither is technical.
The first: an amount above which you say something beforehand. Any figure that fits your income. Below it, nobody explains anything. Nearly every argument about money is about finding out afterwards, not about the purchase.
The second: twenty minutes once a month, with a date in the calendar. Talking about money cold is a conversation; the same talk when the statement lands is a fight.
And personal money
Even a small amount, with no account of where it went. An adult who has to ask permission for everything starts hiding things, and that is where the real problem begins — not in the budget, in the relationship.
Common questions
- Do we need two subscriptions?
- You should not. In Caudal one person pays and the other signs in with their own email for nothing: the subscription belongs to the household, not the seat. An app that charges per person ends up used by one.
- Can access be taken back later?
- It can be removed at any moment and stops working immediately. What the other person recorded while they had access stays in the budget: it is the household's spending, not a loan.
- What if one of us will not record anything?
- It still works, on one condition: they can look at everything whenever they want. What does not work is the information living only in the head of whoever keeps the books.
- Does this work for flatmates rather than a couple?
- Yes, and there it is often enough to split individual bills rather than share the whole budget: you note who put in what and the app works out who owes whom.
Try it on your own money
Caudal is an expense tracker in Spanish, English and Russian. Several currencies, goals, debts, a shared household budget. Recording an expense takes three seconds.
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