When incomes differ, equal splits can feel unfair. Proportional splits match what each person can afford. Here is how to calculate it without a spreadsheet. Zero math.

Calculate each person’s share by percentage

Add household incomes together, then divide each person’s income by the total. Someone earning 60% of combined income pays 60% of shared costs.

Apply the ratio to rent and shared bills

Use the same percentage for rent, utilities, shared groceries, and subscriptions. Personal spending stays separate. Revisit the ratio if someone’s income changes.

Let tricount handle the ongoing math

Custom splits in tricount apply your ratio automatically every time someone adds an expense. Get tricount free or compare with Splitwise.

Income-based bill splitting FAQ

When does splitting bills by income make sense?

When partners or roommates have very different incomes and equal splits would strain the lower earner.

Do we recalculate every month?

Only when incomes change. Otherwise set your ratio once and apply it to each new shared expense.

Can tricount split expenses by custom amounts?

Yes. tricount supports custom splits so your income ratio applies automatically.

Is income-based splitting better than Splitwise Pro?

Splitwise limits free users and charges for advanced splits. tricount offers custom splits free with no ads.

Set your income ratio once. tricount applies it to every shared bill. Free. No ads. No limits. For household bills, see our bill splitting app guide. Roommates splitting rent? Read how to split rent with roommates.