Budget Rules · Calculator

Free Reverse Budget Calculator

What is a reverse budget calculator?

Reverse budgeting flips the order: decide savings and fixed bills first, then spend what is left — instead of saving whatever remains.

Enter take-home pay, your monthly savings target, and fixed bills. See discretionary money for wants and variable costs.

Income − Savings goal − Fixed bills = Left to spend

Also called pay-yourself-first lite. For savings-rate mode, try the pay yourself first calculator.

Sam takes home $4,200, saves $840 first (20%), and pays $1,850 in fixed bills.

$4,200 − $840 − $1,850 = $1,510 left for groceries, fun, and everything else flexible.

Tap Use example for Sam's reverse budget.

Left to spend — Everything flexible after savings and fixed bills — your wants + variable needs pool.
Savings rate — Savings goal ÷ income — did you pay yourself first at your target rate?
Fixed bills share — Bills ÷ income — if this plus savings exceeds 100%, the plan does not fit.

Automate savings on payday so reverse budgeting happens before spending temptations.

Reverse picks savings first; zero-based assigns every dollar to named categories.

Savings plus bills exceed income — lower savings temporarily or cut fixed costs.

Same payment every month: rent, insurance, loan minimums, subscriptions you keep.

Turn this into a real monthly plan. Set income, caps, and alerts in Ziko — free, no bank login.