Moving in together is exciting. Figuring out who pays the electric bill is not.
Yet this single conversation — or lack of it — is behind more relationship strain than most couples realize. A 2024 survey found that financial disagreements are the #1 source of recurring conflict in cohabitating couples, ranked above chores, communication, and intimacy.
The three most common split models
1. 50/50 down the middle Everything is divided equally. Rent, utilities, groceries, Netflix. Simple, clean, and feels fair on paper.
The problem: it only feels fair when both partners earn similar amounts. When there's a meaningful income gap, a strict 50/50 split can quietly breed resentment — the lower earner stretches thin while the higher earner barely notices the expense.
2. Proportional to income Each partner pays a percentage of shared costs that matches their share of combined income. If you earn 60% of the household income, you pay 60% of shared expenses.
This feels equitable to many couples and scales naturally if income changes. The downside is it requires ongoing honest conversations about salary — which some couples find uncomfortable.
3. Designated bills Partner A pays rent. Partner B pays utilities and groceries. Total amounts are roughly balanced.
This model works well when the totals actually balance and stays easy to execute. It breaks down when "roughly equal" drifts over time.
What you actually need to decide upfront
Before you sign a lease together, sit down and answer these:
- Rent and mortgage: Who pays, and what is each person's share?
- Utilities: Electric, gas, water, internet — split how?
- Grocery shopping: Shared account, reimburse each other, or separate?
- Subscriptions and streaming: Who owns each account?
- Emergency fund: Will you keep a joint buffer for unexpected home expenses?
- What happens if one person loses a job?
That last question is where most couples go silent. It's also the most important one to answer while things are good, not after a layoff.
A written agreement changes the dynamic
Talking through money is important. Writing it down is transformative.
When you document how you've agreed to split expenses, a few things happen:
- You're forced to actually reach a clear agreement, not just a vague "we'll figure it out."
- You have a reference point if memory or interpretation diverges later.
- You signal mutual respect for each other's financial security.
A cohabitation agreement doesn't have to be formal or intimidating. It's just a written record of what you both agreed to — covering rent, bills, shared property, and what happens if the relationship ends.
Ready to create yours? Our free cohabitation agreement generator walks you through it in about 5 minutes. Free and easy to use.