Rent is usually the largest bill in a household, which makes it the place where an unfair split hurts most. If your incomes differ, splitting rent by income keeps the burden even instead of just keeping the numbers even.
Want the numbers instantly? Use our free bill split calculator to compare an income-based split with 50/50 in euros.
The formula
Your share of the rent = (your take-home ÷ combined take-home) × total rent
Three steps: add both take-home incomes together, work out what percentage of that total each person earns, apply those percentages to the rent.
Example 1: a moderate income gap
Rent is €1,500. One partner takes home €3,000, the other €2,000.
| Person | Take-home | Share of income | Pays | Rent as % of income |
|---|---|---|---|---|
| Partner A | €3,000 | 60% | €900 | 30% |
| Partner B | €2,000 | 40% | €600 | 30% |
Both spend 30% of their income on housing. Split evenly, it would be €750 each — 25% for one and 37.5% for the other.
Example 2: a wide income gap
Rent is €1,800. One partner takes home €4,000; the other takes home €1,200 during an internship.
| Person | Take-home | Share of income | Pays | Rent as % of income |
|---|---|---|---|---|
| Partner A | €4,000 | 76.9% | €1,385 | 34.6% |
| Partner B | €1,200 | 23.1% | €415 | 34.6% |
An even split would have asked the intern for €900 — 75% of everything they earn, before a single other bill. Proportional splitting is the difference between a workable year and an impossible one.
Use take-home pay
Net, not gross. Rent is paid from what lands in your account, and gross figures hide tax, pension and deduction differences that can swing the split by several percentage points.
- Variable income: average the last six months of post-tax income; re-average twice a year.
- Bonuses: keep them out of the monthly figure and handle them separately.
- Recurring benefits that pay for household life count as income.
When to use it instead of 50/50
Split rent by income when the gap is meaningful — roughly 20% or more — or when one of you is studying, retraining, freelancing through a slow period, on parental leave, or working part-time so the household functions.
Stick with an even split when your incomes are close, when you're flatmates rather than partners, or when you specifically want financial independence and clean lines. There's also a hybrid worth considering: split rent proportionally because it's large, and split everything else evenly because the amounts are small.
One thing to be clear about: paying a larger share of the rent doesn't buy a bigger say in the home. Both people have equal standing regardless of who transfers more.
Keeping it current
Redo the calculation whenever either income changes by more than 10%, and review it quarterly regardless. A split that was fair eighteen months and two raises ago probably isn't fair now, and the person carrying too much rarely raises it in time.
Frequently asked questions
Should we split utilities by income too?
Usually yes, for consistency — apply the same percentages to all shared bills. Some couples split rent proportionally and utilities evenly because utilities are small; either is fine as long as it's agreed.
What if one partner owns the flat?
Then it isn't rent, it's a mortgage on an asset only one person builds equity in. Charging market-rate rent and splitting it by income is one option; the non-owner paying a reduced amount reflecting that they're not building equity is another. Discuss it explicitly and consider written terms.
Does this apply to roommates?
It can, but income disclosure among flatmates is often unwelcome. Room size is usually the better basis there — see splitting rent with roommates.
What if the lower earner feels uncomfortable paying less?
Common, and worth naming. Reframe it: the goal is equal strain, not equal amounts. Non-financial contributions to the household are real contributions.
Set it once and forget it
SharedNest applies your income-weighted split to rent and every other shared bill automatically, and keeps one running balance you both can see. Start free while we're building.
Related: split bills with your spouse · the full income-split method · a couple sharing with roommates
