Day-to-day expenses recur every year and are relatively easy to forecast. Capital expenditure — a new roof, a kitchen renovation, replacing every appliance at once — doesn't recur on a schedule that fits neatly into an annual budget line, which is exactly why it tends to get left out of forecasts until it's unavoidable.
Capex is a forecasting problem, not a budget line
Operating expenses (rates, insurance, management, routine repairs) are forecast as an annual recurring figure — see forecasting property expenses. Capital expenditure is different: it's infrequent, lumpy, and tied to the physical lifespan of specific components rather than a calendar year. Treating it as "an amount I'll deal with when it comes up" isn't a forecast — a real capex forecast puts an estimated year against each major component, based on its expected remaining life.
Typical replacement cycles
While every property differs with quality, climate and usage, major components have reasonably well-understood typical replacement windows worth building a forecast timeline around:
Roof
Often the longest-life major item — commonly several decades depending on material, but worth checking condition on any older purchase.
Kitchen
A full kitchen renovation is typically considered every couple of decades, though cosmetic refreshes (benchtops, cabinet fronts) can extend the interval.
Bathroom
Similar horizon to a kitchen — waterproofing failure is usually the trigger that forces the timing rather than pure cosmetic wear.
Appliances
The shortest-life major item — ovens, cooktops, hot water systems and air conditioning units typically need replacement well within a single ownership period.
Paint / carpet
The most frequent capital item, often timed to coincide with a change of tenant to minimise additional vacancy.
Put an estimated year against each item on a single timeline for the property — this is what turns "capex might come up" into an actual forecast line with a dollar figure and a year attached.
The role of a depreciation schedule
A depreciation schedule, built for tax purposes, is also a useful forecasting input: it lists each depreciable asset in the property along with its effective life, which tells you not just what tax deduction is left to claim, but roughly how much remaining useful life each component has before it's a candidate for replacement. An asset that's fully depreciated for tax purposes is a signal worth cross-checking against your capex timeline — it doesn't mean it needs replacing immediately, but it's approaching the point where replacement becomes more likely than not.
Use the depreciation calculator to see what's still being written off, and see depreciation schedules for how a professionally prepared schedule breaks assets down by effective life.
Timing: when is the right time
Beyond "when it physically wears out," capex timing is itself a forecasting decision — a few windows are consistently better than others:
- Between tenancies — a vacancy gap you're already absorbing is the lowest-cost time to do disruptive works, since there's no tenant to compensate or relocate.
- Before a refinance valuation — a renovation completed shortly before a valuation can lift the assessed value, improving the LVR position used for a refinance.
- Before sale — cosmetic works with a high value-to-cost ratio (paint, flooring, staging-level fixes) are often timed just before listing rather than earlier, to avoid paying for wear-and-tear that would occur before the buyer takes over.
- Bundled, not one at a time — bundling multiple planned items into a single disruption window (e.g. one vacancy period) usually costs less overall than spacing them across multiple separate disruptions.
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