Two ways to split shared money

When two incomes are unequal, the fair way to share costs is genuinely arguable — and the argument goes better with numbers than without. Enter both incomes, the shared spending and saving, and each partner’s own fixed costs; the tool works both plans, fifty-fifty and by income share, and shows what each person is left with under each. It lays out the room and the cost of each plan; it does not pick a winner.

Result

Joint need (shared spending 12,000 + joint saving 4,000) = 16,000. Fifty-fifty: each transfers 8,000, leaving Partner A 5,000 and Partner B 0. By income share: Partner A transfers 9,846 and Partner B 6,154, leaving Partner A about 3,154 and Partner B about 1,846. The tool only lays out the room and the cost of each plan; it does not judge who is fairer.

Joint need: 16,000
Fifty-fifty: A left / B left: 5,000 / 0
By share: A transfers / B transfers: 9,846 / 6,154
By share: A left / B left: 3,154 / 1,846

The figures follow your inputs; what counts as fair is a decision the numbers cannot make for you.

Assumptions & limits

The tool does not judge who is fairer; it only shows the room and the cost of each plan so the conversation has something to stand on.