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Zero-based budget calculator

A zero-based budget assigns every dollar of income to a category until nothing is left unplanned. Enter what you take home, give each category an amount, and get the left-to-assign line to exactly $0.

  1. Enter this month’s take-home income. Add a line for each paycheck or side income.
  2. Change the category amounts to your real numbers, add or remove categories.
  3. Adjust until Left to assign reads $0. Over budget? Take it from a category you can shrink.
IncomeAmount
CategoryAmount
$0Income
$0Assigned
$0Left to assign

Track this in Budgetfold. Budgetfold is a zero-based budget app: income lands in Ready to assign, you fill your categories, and spending comes out of them all month. Free plan covers this month’s budget, no card.

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This is an estimate, not financial advice. Everything is calculated in your browser; nothing you type is sent anywhere.

How a zero-based budget works

Income minus everything you assign must equal zero. Zero does not mean spending it all: savings, extra debt payments and sinking funds are categories too. The point is that no dollar is left without a plan, so when a category runs out the choice is explicit: move money from another category, or stop.

The order to fill categories

  1. Bills that do not negotiate: housing, utilities, insurance, minimum debt payments.
  2. Day-to-day spending: groceries, transport, household.
  3. Irregular bills as monthly amounts. The sinking fund calculator works these out.
  4. Savings and extra debt payments.
  5. Fun money with what is left, until left to assign is zero.

Limits of this worksheet

It plans one month and does not track spending. It is not saved anywhere, and refreshing the page brings back the example numbers. In a budgeting app the same plan carries forward: unspent money stays in its category and overspending comes out of next month.

Questions

What does zero-based budgeting mean?

Every dollar of income is assigned to a category, including savings and debt, so income minus assigned money equals zero. You plan the month before you spend it.

Does zero-based mean I spend everything?

No. Savings, an emergency fund and extra debt payments are categories. Assigning money to them counts toward zero just like rent does.

What if my income changes every month?

Budget with the lowest month you expect, or only the money you already have. When more comes in, assign the extra to savings or to categories that ran short.

How is this different from the 50/30/20 rule?

50/30/20 sets three percentage targets. Zero-based gives every category its own amount. Many people check their plan against 50/30/20 to see if the overall shape is reasonable.

Is there an app that does this?

Budgetfold is built around the zero-based method: income goes into Ready to assign, you move it into categories, and overspending rolls into next month. The free plan covers the current month.

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