How to split bills by income
Splitting every bill down the middle feels fair until one of you earns a lot more than the other. Then half the rent is a comfortable share of one pay packet and most of the other. Splitting in proportion to income fixes that: each of you pays the same fraction of what you earn. Here is the arithmetic, the decisions you have to make first, and how to keep it running month after month without a spreadsheet.
The arithmetic in one line
Each person's part of a bill is their income divided by the two incomes added together.
Worked example: one partner takes home 3,000 a month and the other 2,000. Together that is 5,000, so the first pays 3,000 / 5,000 = 60% of each shared bill and the second pays 40%. A shared bill of 1,000 becomes 600 and 400. The currency does not matter — the percentages are the same in kroner, pounds or dollars.
The same rule works for three or more people sharing a house: add every income up, and each person's percentage is their income over that total.
Decide what counts as income before you do any sums
Most arguments about an income split are really arguments about the inputs. Settle these once, out loud:
- Take-home pay or gross pay. Take-home is usually fairer, because it is what each of you actually has to spend.
- Whether a bonus, benefits or a side income count.
- Whether only the shared bills are split this way (rent, energy, the food shop) and personal spending stays personal.
- When you will look at it again — a new job or parental leave changes the percentages, and the split should follow.
Doing it in Splitsheet
Start a sheet with your two names and send the link to your partner. When either of you adds a bill, pick "By shares" and type each person's income as their share. Big numbers are fine, and so are spaces or commas in them. The percentages appear next to each name as you type, so you can see the split before you save it.
The next time you add a bill on the same phone, the sheet offers "Same split as last time" with your incomes already filled in. One tap and the bill is split by income again. The balances keep a running total of who is ahead, and the settle-up shows the one payment that evens it out at the end of the month.
Splitting some bills evenly and some by income
Many couples split the big fixed costs by income and the small things evenly, or keep date nights fifty-fifty. A sheet does not force one rule: each line has its own split. Add the rent "By shares" with your incomes, and the takeaway "Split evenly". The balance at the top is still one number.
When an income split is not the right tool
If one partner has no income at all, a percentage split turns into one person paying everything, and the real question is how you share money, not bills. A joint account, or an agreed allowance, may suit you better. A proportional split works best when both of you earn and want your own money to stay your own.
Frequently asked questions
Is splitting bills by income fairer than fifty-fifty?
It is fairer when the incomes are far apart, because each of you gives up the same share of what you earn. When the incomes are close, the two methods come out almost the same and an even split is simpler.
Do I need a calculator for an income split?
Only for the percentages: income divided by the total. A sheet that takes each income as a share does that division for every bill, so nobody has to redo it when the electricity bill arrives.
Does my partner need an account to see the split?
No. Splitsheet has no accounts. Whoever has the sheet's link can see it and add to it, on any phone, without installing anything.
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