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How to split flat expenses fairly: a practical guide

Bills, internet, food, cleaning… Shared flat expenses add up fast. Here are the fairest methods and how to avoid the most common conflicts.

C

Calyu

8 April 2026

One of the main sources of conflict in shared flats is money. Who paid the electricity? Who owes who what? Without a clear system, tension is guaranteed.

The 3 main methods for splitting expenses

1. Equal split (the most common)

Each person pays the same share of all shared expenses, regardless of who generated them. It's the simplest method and the one that generates the least friction.

2. Income-proportional split

Whoever earns more, pays more. A fairer method when there are significant economic differences between flatmates, but it requires transparency about everyone's income.

3. Usage-based split

Each person pays exactly what they've consumed. Ideal in theory, very complicated in practice.

Recommendation: use the equal split for fixed expenses (electricity, internet, rent) and common sense for variable ones (food, cleaning).

Common mistakes that cause conflicts

  • Not recording expenses immediately → memory fails
  • Not having a clear shared account → no one knows who owes what
  • Mixing personal expenses with shared ones
  • Not establishing which expenses are shared and which aren't
  • Waiting too long to settle up → amounts accumulate

How Calyu solves it

With Calyu, the process is simple: whoever pays an expense logs it in 5 seconds. The app automatically calculates how much each flatmate owes and keeps a clear history.

  1. 1.Open Calyu and tap "New expense"
  2. 2.Enter the amount and description
  3. 3.Select who should pay for it
  4. 4.The app calculates and notifies automatically

Tips for drama-free expense management

  • List all fixed expenses at the start of the month
  • Agree together on which expenses will be shared and how
  • Review accounts once a week (5 minutes is enough)
  • Use an app like Calyu to keep everything recorded
  • Settle accounts every month, don't wait

Manage your flat with Calyu

Download the free app and discover how to simplify shared living.

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