Zero-based budgeting assigns every dollar of income a job before the month begins. Nothing is unallocated. The discipline forces the household to make its priorities explicit in advance, and its advantage over percentage rules is that it accounts for the specific shape of the coming month.
- 01Construct a zero-based budget for a given income.
- 02Handle irregular income under zero-based rules.
- 03Distinguish zero-based from envelope budgeting.
The procedure
List expected income for the month. List every category the household will spend on. Assign a dollar amount to each category. The sum must equal income exactly — savings and debt paydown are categories, not residuals.
Irregular income
Households with variable income budget against the lower expected value, not the mean. Excess flows into a smoothing account that funds low months. The rule is: never budget on income you do not have.
Envelopes
Envelope budgeting is zero-based budgeting with physical or digital sub-accounts for each category. It adds friction, which is the point — friction reduces overspend in discretionary categories.
- Every dollar has a job before the month begins.
- Savings is a category, not what is left over.
- Budget against the trough of variable income, not the mean.