A Car, a Roof and a Set of Teeth Are Not Emergencies
Every retirement contains a set of large irregular costs — a car every decade, a roof, a hot water system, dental work, hearing aids. They are predictable in aggregate and unpredictable in timing, which makes them a budgeting problem rather than a risk, and treating them as emergencies is what turns an adequate plan into a stressed one.
- The answer: List the large irregular costs, divide each by the years between them, and add the total to the annual budget as a sinking fund.
- The trap: A monthly budget built from monthly spending misses all of them, and the plan looks adequate until the third year.
- The recommendation: Hold the sinking fund separately from the spending buffer. They do different jobs and combining them means one is always being raided for the other.
Where the AI summary above gets this wrong
"Build an emergency fund of three to six months of expenses for retirement."
That's surface-true. Here's what it misses:
- Most of these costs are not emergencies — A car replacement and a roof are foreseeable expenditures with uncertain dates. Treating them as emergencies means they are never budgeted and always a shock.
- Three to six months is a working-life rule — It exists to cover a period without income. A retiree's income does not stop, so the relevant question is lumpy expenditure rather than income interruption.
01 The costs that actually arrive
A car every eight to twelve years, a hot water system, a roof or gutters, a kitchen or bathroom at some point, and the appliances. Then dental work, hearing aids, and glasses, which are covered in the healthcare costs post.
Family costs sit alongside them: a wedding contribution, help with a deposit, travel to see grandchildren who moved. Those are discretionary and they are also real, and a plan that pretends otherwise is describing a different household.
In aggregate these frequently amount to more than a household's entire discretionary travel budget, and they are almost never in the plan.
02 Turning them into an annual number
List each cost with its expected amount and the years between occurrences. Divide each by its interval and add the results. That total is what belongs in the annual budget.
The number is usually larger than expected — a $45,000 car every ten years is $4,500 a year on its own — and the point of calculating it is that it stops being a surprise.
It also changes the target balance, because the annual spending figure feeding the calculation in the how much do I need post should include it.
Shows: the annual amount to set aside for large irregular costs, from each cost and the years between occurrences. Ignores: inflation on the costs themselves, the return earned on the fund, and any costs you have not listed.
03 Where to hold it
A sinking fund can sit in the same cash holding as the spending buffer, provided the two amounts are tracked separately. What does not work is one pool doing both jobs, because the buffer gets spent on the car and is not there for the bad market year.
For a large, distant item, a term deposit or short fixed interest matched to the expected timing is reasonable. For anything within a couple of years, cash.
Where the household has substantial home equity and no liquid reserve, the Home Equity Access Scheme can fund a lump sum against the property — an option rather than a plan, described in the scheme reference.
The car is the one that catches people. A household budgets from twelve months of bank statements, the year happened not to contain a car, and the plan is short by four or five thousand a year from the start. List the lumpy things, divide by the interval, and put the number in the budget.
FAQ
How do I budget for big one-off costs like a new car or home repairs in retirement?
List each cost with the years between occurrences, divide, and add the total to your annual budget as a sinking fund. They are predictable in aggregate even though the timing is not.
How much should I hold as a buffer for unexpected costs in retirement?
Hold the sinking fund for foreseeable lumpy costs separately from the cash buffer that protects against selling in a bad market. One pool doing both jobs means the buffer is always being raided.
Is a three to six month emergency fund the right rule?
That is a working-life rule designed to cover a period without income. A retiree's income does not stop, so the relevant question is lumpy expenditure rather than income interruption.
Sources
Regulator references
- ASIC Moneysmart — Save for an emergency fund · ASIC Moneysmart · 2026How large an emergency fund should be and where to hold it.Last verified: 2026-09-07
- ASIC Moneysmart — Retirement income · ASIC Moneysmart · 2026The sources of retirement income in Australia and how they combine.Last verified: 2026-09-07
Calculator unit tests · the assertions this page's worked example is checked against, and their last result
Changelog
- 2026-09-07 — initial publish (new format)
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Jordan Reeves
Founder of Talk Through Wealth. A software engineer for over a decade before turning to retirement planning, Jordan built the projection engine after watching family members get fragmented, country-by-country advice that never reconciled. He writes about retirement the way the engine computes it: month-by-month, lifetime-long, and skeptical of any rule of thumb that hasn't been run through the math.