How to split household bills fairly when incomes differ
By Mitch R, Tab Tender Team · 2 min read · Updated June 10, 2026
To split bills fairly when incomes differ, split in proportion to income rather than evenly: add up both incomes, work out each person's share of the total, and apply that percentage to the shared bills. Someone earning twice as much pays twice as much — the same share of their paycheck goes to rent.
Splitting rent and shared bills exactly in half feels fair until you remember that one person might earn twice what the other does — at which point 50/50 quietly takes a much bigger bite out of the lower earner's life. For couples and roommates with very different incomes, a proportional split is often the fairer model. Here's how it works, with the math laid out.
On this page
Even vs. proportional: what's actually fair?
An even split treats a dollar as a dollar. A proportional split treats it as a share of what you earn — so each person contributes the same percentage of their income to the shared pot. Neither is universally 'correct,' but when incomes are far apart, proportional usually feels fairer because it equalizes the impact, not the amount.
The proportional method, step by step
- Add both incomes to get the household total.
- Divide each person's income by that total to get their share (e.g. $4,000 and $6,000 → 40% and 60%).
- Apply each share to the combined bills: the 60% earner covers 60% of rent, utilities, and groceries.
- Revisit when incomes change — a raise or a new job shifts the percentages.
A worked example
Say rent plus utilities is $2,000, one partner earns $4,000/month and the other $6,000. Combined income is $10,000, so the split is 40/60. The lower earner pays $800 and the higher earner pays $1,200 — instead of $1,000 each. Both now spend 20% of their income on housing, which is the point: equal effort, not equal dollars.
Variations worth considering
- Hybrid: split fixed costs (rent) proportionally but shared extras (a streaming plan) evenly.
- Floor: agree a minimum each person contributes so it never feels like one person 'pays for everything.'
- Personal vs. shared: keep individual spending separate and only apply the proportional rule to genuinely shared bills.
Tracking it without friction
Once you've agreed the percentages, the day-to-day is just logging shared costs and keeping a running balance. A household in Tab Tender keeps that ongoing total for you — add each shared bill, and settle up the net whenever, so the proportional split runs itself instead of living in a spreadsheet you have to maintain.