There is no magic number. The right number of accounts is the fewest that stop bill money, savings and spending money from being mixed up. Here is how to decide.
Written by Alex BPublished 10 November 2026
Money Detective is built around practical household money tools for Australians.
Advice on bank accounts tends to be either "keep it simple" or "have six accounts". Neither is right for everybody. The test is whether you can tell, at any time, how much of the balance is already spoken for. This guide helps you work out how many you need. It is general information, and it does not recommend any particular bank or product.
You do not need three accounts for three jobs. You need a way of knowing which dollars belong to which job.
One account can work when your income is steady, your bills are few and you track what is committed. The risk is that the balance looks bigger than it is. If you use one account, keep a list of what is due before your next payday and subtract it from the balance (see what is safe to spend).
A bills account plus a spending account is the most common step up. On payday, you move the amount needed for bills to the bills account. Whatever is left in the spending account is yours to spend. It helps if:
With a monthly bill and a fortnightly pay, move monthly × 12 ÷ 26 to the bills account each pay. See how to budget fortnightly.
If you use a separate bank account for bills, the question is how much to transfer on payday. Enter each bill and how often it is charged. The total is what to move each pay, so the account is full when the bills come out.
Add a savings account when you have a goal that you do not want to dip into. An emergency fund is the most common one. Costs you know are coming, like rego or Christmas, can sit in the savings account too, but keep track of each goal separately (see sinking funds).
Check the product disclosure details with the bank before opening an account.
Some people keep a small "buffer" in the bills account, roughly one pay of bills, so that a direct debit that lands a day early does not overdraw. It means the first bills of each pay come out of last pay's money, which is the same buffer idea as in living paycheck to paycheck. A buffer account does not need to be a separate one. It can be a fixed amount you do not touch in the bills account.
| Bill | Amount and frequency | Per fortnight |
|---|---|---|
| Rent | $1,000 a fortnight | $1,000.00 |
| Electricity and gas | $300 a quarter | $46.15 |
| Internet and phone | $130 a month | $60.00 |
| Car insurance | $85 a month | $39.23 |
| Streaming and subscriptions | $40 a month | $18.46 |
| Move to the bills account each pay | $1,163.84 | |
If the pay is $2,350, the other $1,186.16 stays in the spending account for groceries, fuel and everything else. The figures are examples. Convert your own, because monthly × 12 ÷ 26 is not the same as half.
The fewest that let you tell, at any time, how much of the balance is already spoken for. For many people that is two or three: spending, bills and savings.
You do not need one, but it helps if bill money tends to get spent by accident. The alternative is a list of what is committed that you subtract from the balance.
Convert every bill to your pay cycle and add them. The calculator above does this.
For goals you do not want to touch, usually yes. Keep track of each goal separately.
Yes. A spreadsheet can show which money is for which job. See which budget spreadsheet suits you.
You can do the same job in a spreadsheet. List what is committed and subtract it from the balance. Payday Buffer is an Excel workbook that does this, with no bank connection.
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.