Split Bills by Income Calculator

How to use this calculator

Change the example numbers to your own. The results update as you type; copy the result to discuss with your group.

• Enter both monthly incomes using the same basis, usually take-home pay.
• Add only the monthly bills you have agreed to share.
• Compare the proportional split with equal shares and discuss the amount left for each person.

A worked example

With monthly incomes of £3,000 and £2,000 and £1,500 in shared bills, contributions are £900 and £600. An equal split would be £750 each.

Assumptions to agree before you split

• The calculation distributes shared bills, not savings or personal debts.
• Zero income is allowed for one partner; combined income must be above zero.
• Income is only one way to agree a contribution. Caring responsibilities and fluctuating earnings may need a different arrangement.

Is splitting bills by income always fair?

It gives both people approximately the same bill-to-income percentage, before rounding. Whether it suits you also depends on commitments, unpaid work and the budget you agree.

Should I use gross or net income?

Use the same basis for both people. Take-home income usually makes the comparison easier because it reflects money available to spend.