Should couples split bills 50/50?

TD Bank puts it this way: a 50-50 split works well, especially when both partners earn similar amounts, and if incomes differ significantly, consider splitting by earnings. That is the whole answer in two lines. The rest of this page shows what the gap does to the numbers, so you can see it for yourselves.

When 50/50 works

• Your pay is close. With take-homes of $4,200 and $3,900, a split by income would move $74 a month off an even split of $4,000. Not worth the extra math.
• You want it simple. Half each needs no formula and no updates when pay moves a little.
• Both of you have room left over. If your half leaves each of you comfortable money for saving and spending, the percent does not matter much.

When 50/50 stops working

• A big pay gap. The same dollars are a small bite of one pay and a big bite of the other.
• One of you earns less for a while. Part time work, school, a career change, or time off with a baby.
• Kids. Childcare and a bigger grocery bill raise the shared total, and a fixed half gets heavier for whoever earns less.
• One of you is giving up lifestyle. Ramit Sethi warns that 50-50 splits can create resentment when one earns significantly more but has to live below their preferred lifestyle.

Couples often don't split evenly. In a survey of 906 unmarried Gen Z and millennial pairs by the Thriving Center of Psychology, reported by CNBC in 2023, half said they don't split the mortgage or rent equally. It is a narrow group and an older survey, so treat it as one data point.

A worked example: $5,200 and $3,400 take-home

Say one of you takes home $5,200 a month and the other $3,400, $8,600 together. Your shared costs (rent, utilities, internet, groceries, insurance) come to about $4,000 a month. By income, the shares are 60.5% and 39.5%, the same as on how to split bills based on income.

And what each of you has left after the shared costs:

Under 50/50 the lower earner has $1,400 left, less than half of the other's $3,200. Splitting by income moves $419 of the bills onto the higher earner, and the leftovers become $2,781 and $1,819. The bills now weigh the same on both of you. They still don't make your leftovers equal. Only pooling does that.

None of these is the right one. They answer different questions: equal dollars, equal weight, or equal leftovers. Pick the question you care about, and see uneven incomes for more on the choice.

What to do instead

• Split by income. Each of you pays the same share of your own pay. Good when the gap is clear and steady.
• Pool and split the rest. Both pays go in, the bills come out, and the remainder is split evenly. Good when you want equal spending money.
• Mix them. Rent by income, everything else 50/50. Or the reverse. Keep the exceptions few.
• Match personal money to the split. Ramit Sethi says that with proportional contributions, personal spending should match the same proportion. With equal contributions, it is equal.

Rent is the biggest piece, so some couples start there. See how to split rent. For all the common setups, see seven ways couples split money, and to run your own numbers, use the fair split calculator.

How to bring it up

1. Pick a calm time. Not the night a bill arrives. Ramit Sethi notes that money fights are about power, trust and fear more than about the math.
2. Start with what you want. Sethi suggests each of you write down three things you want money to provide, then look for the overlap.
3. Bring the numbers. Show both pays, the shared total and the table above with your own figures. It is easier to talk about 59% of a pay than about fairness in general.
4. Try one for three months. Then talk again. Sethi advises being willing to adjust the system together when it fails.
5. Set a date to revisit it. Pay changes, so the split should too. Our money date guide has a simple way to do it.

When Wonderful is the wrong pick

Wonderful is built for couples who keep their own money, and for one person. It splits shared costs evenly, by income or any way you choose, and keeps a running total of who owes whom. It is not free after a free week: $14.99 a month or $99 a year for the household. It runs in the browser, with no phone app. If you only need to divide one bill once, the calculator is free, and if you want a tool for a group of roommates, see the apps to split bills.