How to split rent fairly when incomes differ
A simple framework for roommates and partners with unequal incomes — without anyone feeling shortchanged.
Splitting rent in half is the easiest math, and the worst answer when one person earns three times the other. The fairest splits aren't necessarily the equal ones — they're the ones that leave both people with similar breathing room at the end of the month.
Here are three frameworks that work, ordered from least to most fair. Pick the one that matches how much you trust each other.
1. Proportional to income
Each person pays the share of rent that matches their share of total household income.
If A earns $4,000 and B earns $6,000, total is $10,000. A pays 40% of rent, B pays 60%.
This is the textbook answer and it works fine when both incomes are stable. The catch: it breaks down if someone has expensive obligations the other doesn't (student loans, family support, medical bills). Two people with the same income can have very different disposable income.
2. Proportional to disposable income
Same idea, but each person subtracts their non-negotiable monthly obligations before the split. Rent then takes the same fraction of what's left over.
A: $4,000 income − $800 student loan = $3,200 disposable B: $6,000 income − $0 = $6,000 disposable Total disposable: $9,200. A pays 35% of rent, B pays 65%.
This is fairer because it accounts for the fact that some money is already spoken for. The downside: now you have to share information about each other's debts, which can feel intimate. Make sure both people are comfortable.
3. Equal post-rent disposable income
The most equitable: rent is split so that both people end up with the same amount of money left after rent.
Total income: $10,000. Rent: $2,000. Total disposable after rent: $8,000. Each should have $4,000 left. So A pays $0, B pays $2,000? Almost — but in practice, the higher earner contributes more, but never enough to leave them poorer than the lower earner.
The math here is: solve for payment_a and payment_b such that income_a − payment_a == income_b − payment_b AND payment_a + payment_b == rent. Algebra:
payment_a = (rent + income_a − income_b) / 2
payment_b = rent − payment_a
For our example: payment_a = (2000 + 4000 − 6000) / 2 = 0. The lower earner pays nothing. That's only practical if the gap is dramatic; usually you cap the lower-earner share at some minimum (like 25% of rent) so neither person feels like a charity case.
How to actually agree
Most rent-split fights aren't about the math — they're about not knowing the math up front. Whatever framework you pick, write it down and revisit it whenever someone's income changes by more than 10%.
This is what shared ledgers like Solvory are for: instead of one person tracking the rent, both of you see the same record. When circumstances change, both of you can propose an adjustment, the other approves, and the new split takes effect — no awkward post-fact conversations.
The conversation script
If you're stuck having the conversation, this works:
"I want us to feel like the rent split is fair to both of us, not just convenient. Can we look at the numbers together once a year, and adjust if either of our situations have changed?"
That single sentence does three things: signals that you care about their fairness, frames it as a recurring review (so neither person feels singled out), and leaves the door open without forcing an answer in the moment.
The goal isn't a perfect formula. It's a decision both of you stand behind and can re-examine without it being a fight.