How couples split expenses: 50/50, by income or a joint account

Before choosing a method, agree on the scope. Most money arguments are not about the math, they are about what counts as a couple expense.

• Almost always shared: rent or mortgage, utilities, internet, home insurance, household groceries.
• Worth discussing: restaurants, vacations, the car, gifts for family, pets, streaming subscriptions.
• Usually personal: clothes, personal hobbies, phone plan, costs for a child from a previous relationship, personal loan repayments.

Write the list down, even roughly. It will help every time an in-between expense comes up.

Each partner pays half of every shared expense. It is the most intuitive method, and often the one couples start with.

• Pros: easy to calculate, transparent, each partner keeps control of the rest of their money.
• Cons: when incomes are far apart, the lower earner spends a much bigger share of their income on the household, and saves less.

Example: with $1,400 of shared costs, each partner pays $700. For someone taking home $1,500, that is 47% of their pay; for a partner on $2,000, it is 35%.

Each partner pays a share of shared costs proportional to their income. The formula: A’s share = A’s income ÷ (A’s income + B’s income).

With $1,500 and $2,000 of take-home pay, the shares are 43% and 57%. On $1,400 of shared costs, that means $600 and $800, or 40% of each partner’s income. Same effort, different amounts.

• Pros: fair when the income gap is large, each partner keeps a proportionate amount to live on.
• Cons: you need to recalculate when an income changes, and the higher earner may feel they are “paying for two” if it is not talked through.

Both paychecks go into a joint account and every expense comes out of it. There is no “your money” and “my money” any more, only the household budget.

It is a common model. In France, according to the national statistics office Insee, in 2010, among couples living together for at least a year with at least one partner working, 64% pooled all their income, 18% pooled part of it and 18% kept it fully separate.

• Pros: no math, one view of the budget, shared goals are easier to fund.
• Cons: less autonomy, personal purchases to justify, and a harder situation to untangle if you separate.

Many couples who pool everything still give each partner a small personal allowance every month, so nobody has to justify a book or a coffee.

Couples often combine methods. Two common variations:

• Fixed costs by income, everyday 50/50: rent and big bills are split by income, groceries and outings equally.
• A joint account funded by income: each partner transfers their share every month into a joint account that pays the bills, and keeps the rest.

With the earlier example ($900 of fixed costs, $500 of everyday spending), the first variation gives about $636 and $764. To decide whether you need a joint account, read Joint or separate accounts?.

When one partner earns noticeably more, a strict 50/50 split leaves the lower earner with much less to live on. Three fair options:

• Split everything by income: with $1,500 and $2,000 of take-home pay, 43% and 57% of every shared bill.
• Split only the big fixed bills by income (rent, utilities, insurance) and keep groceries and outings 50/50.
• Have the higher earner cover specific bills that roughly match the gap, such as rent, while the other covers groceries.

Whichever you pick, put the numbers on the table together. Our split by income calculator shows each partner’s share and what each has left over under 50/50, proportional and mixed splits.

Choosing a method is the easy part. Sticking to it takes a little organization:

1. Record who pays what when the expense happens. Rebuilding a month from receipts is rarely fun.
2. Settle up regularly, for example at the end of each month.
3. Set a budget for categories that tend to drift, like groceries or eating out.
4. Revisit the rule when life changes: new job, a baby, a move, part-time work.

A shared budget app like SAVY does this for you: each partner adds expenses, the app works out who owes whom and cuts down the number of repayments. You can set a monthly budget with alerts, and log rent and subscriptions as recurring expenses. Equal splits are free; custom splits (by income, 60/40, shares) are part of SAVY Plus.