The short answer: most couples either split shared bills 50/50, or split them in proportion to what each person earns. There's no right answer. What matters is that you both agree, it feels fair, and you can see at a glance who owes what.
The three common approaches
| Approach | How it works | Suits |
|---|---|---|
| 50/50 | Every shared cost is split down the middle | Couples or housemates who earn similar amounts |
| By income | Each person pays the same percentage of their take-home pay towards shared costs | Couples with different incomes |
| All in one pot | Both incomes go into one place and everything is shared | Couples who prefer to treat all money as joint |
How splitting by income works
Add your take-home pay together, then work out each person's share.
| Alex | Sam | Together | |
|---|---|---|---|
| Take-home pay | £2,600 | £1,900 | £4,500 |
| Share | 58% | 42% | 100% |
| Shared bills of £2,100 | £1,213 | £887 | £2,100 |
| Left for yourself | £1,387 | £1,013 | £2,400 |
Alex and Sam are a made-up example.
Both are left with the same proportion of their pay. With a 50/50 split, each would pay £1,050 and Sam would have noticeably less left over.
To try it with your own numbers, use our free bill split calculator. It shows what each of you pays and has left, by income or 50/50.
What counts as a shared cost?
Agree this up front. Common shared costs are rent or mortgage, council tax, energy, water, broadband, the food shop and household essentials. Things like clothes, phones and personal subscriptions usually stay separate. Meals out and holidays are worth a quick chat, because couples handle them in lots of different ways.
Keeping track without awkward conversations
- List your regular shared bills and who pays each one.
- Note one-off shared spending as it happens, like a big food shop or a takeaway.
- Once a month, work out who has paid more than their share.
- One payment settles it, and you both start the next month even.
A shared spreadsheet makes this easy because you can both see the same numbers, and nobody has to keep a running tally in their head.
Talking about money
It's normal for this to feel a bit awkward at first. Pick a calm moment, start with what you both want (fewer arguments, saving for something together), and agree to review it every few months, or whenever one of your incomes changes.
Going on holiday together or with friends? Our guide to splitting holiday costs fairly uses the same settle-up idea.
Frequently asked questions
Is splitting bills 50/50 fair?
It can be, especially if you earn similar amounts. If one of you earns a lot more, a 50/50 split can leave the lower earner with much less left over each month, which is why some couples split by income instead.
How do you split bills by income?
Add your take-home pay together, then work out each person's share as a percentage. Each of you pays that percentage of the shared bills.
Does this work for housemates?
Yes. Housemates usually split 50/50 or by room size rather than income, but the same idea of tracking who paid what and settling up monthly works well.
Keep reading
- How to make a monthly budget in a spreadsheet: plan the rest of your money around shared bills.
- How to split holiday costs fairly with friends: the same idea for trips away.
- Sinking funds list: 30 ideas: shared costs that don't come every month.
- Free bill split calculator: work out each person's share in seconds.
Split bills fairly in a template
Our Couples Budget & Bill Splitter splits shared bills 50/50 or by income, logs shared spending, and shows in one line who owes whom each month. It works just as well for housemates.
Important: This article is general information to help you organise your money. It is not financial advice and doesn't take your personal circumstances into account. Any figures are made-up examples. For free, impartial guidance, visit MoneyHelper. If you're worried about debt, contact StepChange or Citizens Advice.