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Start with take-home cash, then allow for housing, essential bills, debt payments, irregular costs and savings. Employer super belongs outside the spending budget because it is generally preserved for retirement.
Use one pay cycle for everything
If you budget monthly, convert weekly costs by multiplying by 52 and dividing by 12. A $100 weekly cost is about $433 a month, not $400. For fortnightly budgets, annual costs are usually divided by 26.
Put annual insurance, registration, medical costs and repairs into smaller regular allowances. They still use income even if no bill arrives this month.
| Period | Equivalent |
|---|---|
| Week | $100 |
| Fortnight | $200 |
| Month | About $433 |
| Year | $5,200 |
Keep a buffer for the parts you cannot predict
A full-year calculator smooths the tax picture. Actual pay can change with leave, overtime, deductions and payroll rounding. If the budget works only when every estimate lands exactly, give it more room.
The standard work deduction may lower annual tax without raising each payslip during the year. Treat a possible tax-time benefit separately from cash available for this week’s expenses.
Use your own costs, not a generic city promise
Housing, transport, dependants and debts vary too much for one salary label to answer whether you can afford a lifestyle. Start from the actual costs you expect rather than a claim that one salary is enough everywhere.
Compare offers after work costs as well as tax. An extra office day can mean travel, parking and time away from home; a pay rise needs to cover those before all of it feels like a gain.
Sources you can check
Sources checked for this page on 2 October 2026. Statistics keep their own measurement dates.