Why shared costs cause friction
Money is one of the most common sources of tension between partners and housemates. Usually it is not the amounts; it is uncertainty and a sense of unfairness. A clear, agreed system removes both.
Three common approaches
1. Equal split
Everyone pays the same share.
- Works well when incomes are similar, and for housemates.
- Can feel unfair when one person earns much more.
2. Proportional split
Each person pays in proportion to their income.
| Income | Share of income | Share of $2,000 costs | |
|---|---|---|---|
| Alex | $4,000 | 67% | $1,333 |
| Sam | $2,000 | 33% | $667 |
| Total | $6,000 | 100% | $2,000 |
Under an equal split, Sam would pay $1,000, half of their income. Under a proportional split, both pay one-third of their income.
- Works well for couples with different incomes.
- Needs agreement on what counts as income, and a review when incomes change.
3. Pooled
All income goes into one pot; everything is paid from it.
- Works well for couples who see all money as shared.
- Needs high trust and agreement on personal spending.
Many couples use a hybrid: shared costs paid proportionally into a joint account, with each person keeping personal money separately.