How to Split Expenses as a Couple: 3 Fair Methods

Moving in together turns a lot of small money questions into one big one: who pays for what? There’s no single correct answer. The right system is the one you both think is fair and that you’ll actually keep using after the first month.

Most systems come down to one of three approaches: split everything 50/50, split in proportion to income, or pay into a shared pot. Below you’ll find each one worked through with the same monthly numbers, so you can compare them side by side, plus how to set each one up in Spliteo.

First, agree on what’s shared

Before picking a method, make a list of what counts as a joint cost. Usually that’s:

• Rent or mortgage
• Utilities and internet
• Groceries
• Streaming and other shared subscriptions
• Dinners out and trips together

Then name what stays personal: your own clothes, hobbies, the gym, gifts for each other. The gray areas (a car only one of you drives, one person’s pricey coffee habit) are worth talking through once, out loud, instead of quietly resenting them for a year.

The example

Alex and Sam live together. These are their shared costs for the month:

Cost	Amount	Paid by
Rent	$1,600	Alex
Groceries	$500	Sam
Utilities and internet	$150	Sam
Streaming	$30	Sam
Total	$2,280

Alex paid $1,600 and Sam paid $680. Alex takes home $4,500 a month and Sam takes home $3,000.

Method 1: Split everything 50/50

Each person’s share is $2,280 ÷ 2 = $1,140.

• Alex paid $1,600 and Alex’s share is $1,140, so Alex is owed $460.
• Sam paid $680 and Sam’s share is $1,140, so Sam owes $460.

Sam sends Alex $460 and the month is settled.

Works well when your incomes are similar, or you both value simplicity over precision.

Watch out for a big income gap. With Alex and Sam’s numbers, $1,140 is about 25% of Alex’s income but 38% of Sam’s. Over time, the partner who earns less can end up with far less room for anything else.

In Spliteo: add each expense, choose who paid, and under Who Benefits? pick Evenly with both of you included.

Method 2: Split in proportion to income

Here each of you contributes the same percentage of your income. Together Alex and Sam take home $7,500, so Alex earns 60% of it ($4,500 ÷ $7,500) and Sam 40%.

• Alex’s share: 60% of $2,280 = $1,368
• Sam’s share: 40% of $2,280 = $912

Now the balances:

• Alex paid $1,600 against a share of $1,368, so Alex is owed $232.
• Sam paid $680 against a share of $912, so Sam owes $232.

Sam sends Alex $232. Both of them put exactly 30.4% of their income toward shared costs.

Works well when your incomes are noticeably different and you’d both rather feel the costs equally than pay equal amounts.

Watch out for incomes that change: a raise, a bonus, freelance months that are feast or famine, one of you between jobs. Agree up front to recalculate the ratio every few months, or whenever someone’s income changes.

In Spliteo: there’s no percentage mode, but Parts does the same job. A 60/40 split is 3 parts for Alex and 2 parts for Sam. A few other common ratios:

Ratio	Parts
55/45	11 and 9
60/40	3 and 2
65/35	13 and 7
70/30	7 and 3

If you’d rather type exact figures, use Amount instead. For the $1,600 rent at 60/40, that’s $960 for Alex and $640 for Sam.

Method 3: A shared pot

Each month you both pay a set amount into a joint account (or a shared card, or even an envelope), and shared bills come out of it. The contributions can follow either of the rules above.

Say Alex and Sam budget $2,400 a month, a little over their $2,280 in costs, and contribute in proportion to income. Alex puts in $1,440 and Sam puts in $960. That covers everything with a $120 buffer for surprises.

Works well when you want fewer transactions to track and like the feeling of “our money” for joint things.

Watch out for the in-between cases: one of you pays a shared bill with a personal card, the pot runs short, or the leftover keeps growing with no plan for it.

In Spliteo: the app doesn’t connect to banks, so the pot itself lives at your bank. What Spliteo handles well is the exceptions. Whenever one of you pays for something shared out of your own pocket, add it to the group and it’s split the way you agreed. If you also want a record of what the pot paid for, add the expense with both of you under Who Paid? and Who Benefits? using the same Parts on both sides (3 and 2, for example). The expense is logged and nobody ends up owing anything.

Which method should you choose?

Method	Best for	Main trade-off
50/50	Similar incomes, simplicity	Can feel unfair when incomes differ
Proportional	Different incomes	Needs updating when income changes
Shared pot	Fewer transactions, a household-budget feel	Needs a joint account and rules for exceptions

You don’t have to pick just one. You might split rent and bills by income and dinners out 50/50. Since you choose the split mode on every expense in Spliteo, mixing methods is easy.

Setting up your group in Spliteo

1. Go to Groups, tap New and follow the Create New Group steps. In Currencies, put your everyday currency first (it becomes the group’s default) and add a second one if you often spend in another, say on trips.
2. Invite your partner with Invite Members, by email or with a link from Create Shareable Link.
3. Add expenses with New Transaction (the + button on mobile).

When one of you pays for something that’s only for the other, like picking up a prescription, add it with just that person under Who Benefits?. The getting-started guide walks through every screen if you want the full tour.

Put rent and subscriptions on repeat

Rent, streaming and the internet bill are the same every month, so there’s no reason to type them in every month. Under Recurring Expenses, tap Create New, set it to monthly and fill in the details once. The free plan includes 1 active recurring expense (rent is the obvious pick); Premium makes them unlimited.

Keep your personal spending separate

Splitting shared costs is only half the picture. Spliteo’s Personal Finance section is for your own expenses, income and savings, and your share of group expenses syncs into it automatically. So if you’re Alex on the proportional method, the $960 of rent you’re responsible for shows up next to your own lunch and gym spending, with no double entry.

From there you can use Add Budget to set a monthly budget, overall or per category, with alerts, and Add Goal to save toward something with a deadline. The free plan includes 1 budget and 1 goal.

Make it a monthly check-in

What keeps any of these methods working isn’t tracking more carefully; it’s looking at the numbers regularly. Once a month, take 15 minutes together:

1. Open the group’s Summary tab and check the Settlement card.
2. Whoever owes pays, by bank transfer, cash or however you like, and you tap Settle! to record it. If you only pay part of it, record that as a Transfer.
3. Skim All Transactions for anything missing. If something looks off, the History tab shows what was added, edited or deleted.
4. Ask the real questions: does the split still feel fair? Has anyone’s income changed? Is a big cost coming up, like a trip or a new sofa?

The point isn’t auditing each other. It’s making money a boring topic, in the best sense.

If you’re sharing a home with more people than just your partner, the guide on splitting bills with roommates covers what changes with a bigger group.