Split your expenses fairly
When incomes differ, 50/50 isn't always fair. Try the proportional split: each partner contributes according to their means.
Your incomes and expenses
Rent, groceries, bills, subscriptions...
Your fair split
You
€1,042
per month
Your partner
€758
per month
With a strict 50/50, your partner would pay €142 more every month. The proportional split adapts to each income.
In WeZioo, this split is applied automatically to every expense: 50/50, proportional or custom.
Automate it with WeZioo50/50 or income-based: which split should you choose?
50/50 is simple and symbolic: each pays the same. It works well when incomes are close, but quickly becomes uncomfortable when they are not, the lower-earning partner ends up spending a much larger share of their salary on shared costs.
Income-based (proportional) splitting fixes that imbalance: each contributes according to their means. Example: with incomes of €2,200 and €1,600 and €1,800 of shared expenses, the proportional split is roughly 58% / 42%, €1,042 and €758 instead of €900 each. The financial effort becomes identical for both.
There is no universally right answer: some couples stand by 50/50, others by proportional, others by a negotiated percentage. What matters is talking about it and picking a rule together, which is exactly what this calculator helps you do, with numbers on the table.
Frequently asked questions
How do you calculate an income-based split?+
Each partner's share = shared expenses × (their income ÷ sum of both incomes). Example: €1,800 of expenses, incomes of €2,200 and €1,600 → share 1 = 1,800 × (2,200 ÷ 3,800) ≈ €1,042, share 2 ≈ €758. The calculator above applies this formula automatically.
Is 50/50 unfair?+
Not inherently, it is simple and works for many couples. It becomes a problem when the income gap is large: the same amount does not represent the same effort for both. Proportional splitting equalises the effort rather than the amount.
Should bonuses and variable income count?+
The simplest approach is a monthly average of your net income over the last 3 to 12 months, bonuses included. If your income varies a lot, recalculate from time to time, or let an app like WeZioo do it every month.
How do you apply this split day to day?+
Two approaches: fund a joint account according to each share, or track expenses and reimburse the difference. The WeZioo app automates the second: every expense is recorded, your rule applied, and you always know who owes what.
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WeZioo tracks your shared expenses, applies your splitting rule and tells you every month who owes what. Bank sync, savings and joint projects included.
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