How much should you set aside weekly for quarterly bills?

Start with a full year, not the latest quarter

Collect the last four quarterly bills for each irregular service and keep different bills in separate rows. Add the four amounts, then divide the annual total by 52 for a weekly reserve or by 26 for a fortnightly reserve. This is an educational budgeting method, not personalised financial advice, and there are no commissions from the official links below.

Moneysmart allows quarterly and annual frequencies and warns that choosing the wrong frequency skews the result. A single low quarter can understate the reserve, while a single high quarter can overstate it if it included a one-off adjustment.

Source: Moneysmart — Budget planner · Australian Energy Regulator — Your energy bill

Reproduce a weekly reserve

Suppose four hypothetical electricity bills were A$360, A$510, A$450 and A$600. Their annual total is A$1,920. Dividing by 52 gives A$36.9230769, so setting aside A$36.92 each week matches the historical total before rounding effects. If you prefer a small planning margin, choose it explicitly rather than pretending the past bills guarantee the future.

Keep the reserve in a labelled account or ledger line and record deposits and bill payments. The calculation is a starting estimate; usage, tariffs, credits and billing periods can change.

Source: Moneysmart — Budget planner · Australian Energy Regulator — Your energy bill

Test the next due date separately

An annual average does not repair a reserve that starts late. If the next hypothetical bill is A$650 in 10 weeks and the reserve already holds A$250, the shortfall is A$400. Dividing A$400 by 10 gives a temporary catch-up amount of A$40 per week. After that bill, return to the ongoing reserve and recalculate when a full new bill arrives.

If A$40 is not manageable, do not hide the gap by lowering the bill estimate. Contact the provider before the due date and ask what current payment options apply.

Source: Australian Energy Regulator — Your energy bill · Moneysmart — Budget planner

Know when bill smoothing is a service, not just your spreadsheet

For energy bills covered by the AER guidance, a retailer payment plan may include bill smoothing: smaller amounts paid more often. That arrangement is separate from a reserve you manage yourself and may be reconciled against actual usage. Ask how the amount is reviewed, what happens after an underpayment and whether any fees or payment-method charges apply.

The AER also points to hardship policies, concessions and Centrepay for eligible people. Availability and rules depend on location and circumstances, so this article does not determine eligibility.

Source: Australian Energy Regulator — Your energy bill · Moneysmart — Budget planner

Build one row tonight

Choose one quarterly bill, enter its last four amounts and dates, calculate the weekly reserve, then compare today’s reserve balance with the next known due amount. Record both the ongoing amount and any temporary catch-up amount. Recheck the row after each new bill rather than silently carrying the estimate forward.

Source: Moneysmart — Budget planner · Australian Energy Regulator — Your energy bill

Changes to this guide

30 September 2026: First publication after Australian Securities and Investments Commission and Australian Energy Regulator review, counterexample audit and exclusive media verification.