Here is one pay cycle worked through line by line: what the pay has to cover, and what is left. All figures are the example household from the Payday Buffer workbook, or invented.
Written by Alex BPublished 10 November 2026
Money Detective is built around practical household money tools for Australians.
If you have wondered what Payday Buffer actually does with your numbers, this page walks through one pay cycle. The first example is the example household shown on the Payday Buffer page, so every figure here matches what you will see in the workbook. The second is a short paper version you can copy with a pen, so you can use the method without buying anything.
This example household has $5,220 of income available for the pay cycle. Here is how the workbook splits it:
| Line | Amount |
|---|---|
| Income available | $5,220 |
| Bills before next payday, with safety cushion | −$3,562 |
| Upcoming expenses | −$720 |
| Essential living money | −$525 |
| Emergency Fund contribution | −$60 |
| Already has a job | $4,867 |
| Estimated Safe to Spend | $353 |
Example household figures from the Payday Buffer workbook. They are illustrative and depend on what you enter.
The key idea is the line called "Already has a job". The household has $5,220, but $4,867 of it is already spoken for, so only $353 is an estimate of what may be left to spend.
These are the bills and direct debits that will come out of the account between today and the next payday: rent, phone, internet, insurance and so on. You list them on the Bills Before Payday tab and mark each one as paid once it has left your account, so it stops being counted. There is an optional bill safety cushion, which adds a little room in case a bill like electricity or water comes in higher.
Annual and irregular costs like rego, insurance, school costs and Christmas. You add each one once, with how often it comes up, what it costs and when it is next due, along with anything you have already saved for it. The workbook works out how much to put aside from this pay, so the money has a better chance of being there when the bill arrives.
Everyday essentials such as groceries and fuel for one pay cycle. You enter a typical amount for the whole cycle, for example a week's worth if you are paid weekly.
This is optional. If you choose to include it, it comes off before the Safe to Spend figure, because the money is already going somewhere.
What remains after those lines. It is a planning estimate based on the figures you enter. It does not connect to your bank, and it does not know about a bill you have not entered. For a plain definition, see what is safe to spend.
The calculator below uses the same logic as the example: money available, minus what is already spoken for, equals what may be left. The figures are only examples, so replace them with yours.
You do not need a spreadsheet to understand the method. Take a piece of paper and use the same five lines. Here is a made-up fortnightly pay to show the steps. These figures are invented, not typical costs.
| Line | Working | Amount |
|---|---|---|
| Bills before next payday | Rent $1,050 + phone $65 + car insurance direct debit $110 + subscriptions $38 | $1,263.00 |
| Safety cushion (your own choice) | A little extra in case a bill is higher | $50.00 |
| Upcoming costs | Rego $860 over 8 pays = $107.50, plus Christmas $600 over 10 pays = $60.00 | $167.50 |
| Essential living money | Groceries $420 + fuel $110 | $530.00 |
| Emergency fund | A small regular amount | $50.00 |
| Already has a job | $2,060.50 | |
| Left from $2,400.00 | An estimate of what may be safe to spend | $339.50 |
Notice that the rego and Christmas money is the amount to set aside from this pay, not the full cost. That is the part most people skip, and it is why a big bill can feel like a surprise even though you knew it was coming. Our guides on budgeting fortnightly and sinking funds cover the sums in more detail.
The example household is paid fortnightly, but Payday Buffer supports weekly, fortnightly, four-weekly and monthly pay. The idea is the same for each, but the numbers move:
A figure of $353 safe to spend is not "$353 free". It is the amount that may be left once everything the pay already has to cover is accounted for. Here are three ways to use it:
If you are comparing options, see which budget spreadsheet suits you. If you are still not sure what the Safe to Spend figure means, this guide defines it and shows where it can mislead you.
Sometimes the amounts you enter add up to more than the pay. Payday Buffer shows a shortfall warning in that case and points to the biggest pressure, so you can see which line to look at first. On paper, you will notice it the same way: the "left" figure goes negative. That is useful information, not a failure. It means this pay needs a decision before it starts, not after the money has gone. If this keeps happening, see our guide on running out of money before payday.
See the full workbook with example figures.
See Payday Buffer, $16.95 →This article provides general information only. It does not take into account your personal objectives, financial situation or needs, and it is not financial advice. Examples use invented figures. Money Detective's tools provide estimates and planning information. Consider your own circumstances, and seek independent advice if you need it, before making financial decisions.