What are the ways to split bills?
There are four common rules. None is correct in general; the right one is the one both people agree is fair and can keep using without resentment.
| Method | How it works | Works best when |
|---|---|---|
| Half each | Every shared bill is divided equally | Incomes are within about 10 to 20% of each other |
| By income | Each pays the same percentage of their take-home pay | One person earns clearly more |
| By use | Whoever uses more pays more: the bigger room, the second car | Roommates, or costs that clearly belong to one person |
| Pooled | Both incomes go into one account and everything is shared | Married or long-term couples who plan as one household |
Couples often mix them: rent and utilities by income, groceries half each, and each person's own phone and hobbies paid separately.
How do I split bills by income?
One line of arithmetic per person:
your share = shared bills x your take-home pay / (your take-home pay + partner's take-home pay)
An example with illustrative numbers. Alex takes home $6,200 a month and Sam takes home $4,300, so together they bring in $10,500. Their shared bills are $2,100 a month, which is 20% of what they earn together.
| Alex | Sam | |
|---|---|---|
| Take-home pay | $6,200 | $4,300 |
| Share by income | $1,240 (20% of pay) | $860 (20% of pay) |
| Left after shared bills | $4,960 | $3,440 |
| Half each instead | $1,050 (16.9% of pay) | $1,050 (24.4% of pay) |
| Left after half each | $5,150 | $3,250 |
Under half each, Sam gives up almost a quarter of their pay for the same apartment while Alex gives up a sixth. Splitting by income makes the burden equal instead of the amount. The fair share calculator runs this with your own numbers.
Should we use gross pay or take-home pay?
Take-home pay, the amount that actually lands in your account. Bills are paid from that, and two people with the same salary can take home quite different amounts once retirement contributions, health insurance and taxes come out.
Whatever you use, use the same measure for both people, and agree when you will redo the split: after a raise, a job change, or the start of parental leave. Recalculating once or twice a year is usually enough.
What counts as a shared bill?
Write the list down together before anyone does any arithmetic. Most arguments about splitting are really about what is on the list.
- Usually shared: rent or mortgage, utilities, internet, renters or home insurance, groceries for the household, cleaning and household supplies, streaming services you both use.
- Usually personal: your own phone plan, debts from before you met, clothes, hobbies, gifts for each other, a car only one of you drives.
- Talk about these: eating out together, holidays, pets, children's costs, and a car you both use. Some couples share them by income, others take turns paying.
Savings can go on the list too. If you are saving together for a deposit or a trip, treat the monthly amount as a shared bill and split it by the same rule.
How should roommates split rent?
Roommates usually split by use rather than income, because the rooms are not the same. A common method splits half the rent equally, for the kitchen, bathroom and living room everyone shares, and the other half by bedroom size.
Example: rent is $2,400 for two bedrooms of 180 and 120 square feet.
- Shared half:
$1,200 / 2 = $600each - Bedroom half:
$1,200 x 180 / 300 = $720and$1,200 x 120 / 300 = $480 - Rent: $1,320 for the large room, $1,080 for the small one
A private bathroom, a parking space or a balcony can be priced the same way. Utilities, internet and shared supplies are normally split equally, since everyone uses them about the same.
How do we keep track of who paid what?
Pick one of three setups and stay with it:
- A joint bills account. Each person transfers their share on payday, and every shared bill is paid from that account. Nothing needs settling afterwards.
- Each pays some bills, then you even up. One person pays rent, the other pays utilities and groceries, and once a month you compare what each paid with what each should have paid.
- A shared list. Every shared purchase goes on one list or spreadsheet with who paid, and you settle the total monthly.
Evening up is simpler than it sounds, because you only need the net. Say Alex paid the $1,600 rent and Sam paid $500 in utilities, internet and groceries. By income, Alex owed $1,240 and Sam $860. Alex paid $360 more than their share, so Sam sends Alex $360, and the month is settled with one transfer.
How does Tally handle shared bills?
Tally has Family, for up to six people, and Group, for up to ten, such as roommates or a trip. Add a shared expense and split it equally, by custom amounts, or by income, which Tally offers once every member has set an income share. Who owes whom nets to one number per person. When you have paid each other back in your usual way, Settle up marks it settled; Tally does not move money.
Each person decides what the others see, with three switches: transactions, budget contributions and income. Any single purchase can be hidden from a partner, which helps with gifts, and bank balances are never shared with a family or group. A shared budget lets each member set their own contribution, and the total is the sum of them. Starting a family or group and inviting people is part of Tally Pro; people who are invited split and settle for free.