Everyday Money guide
How Vacancy and Maintenance Affect Property ROI
Stress-test rental return for empty weeks, routine repairs and major property costs.
Updated 16 October 2026 • Reviewed by Tools by Layna Editorial Team • General information only
Why this decision is easy to misread
Vacancy removes rent while many property costs continue. Maintenance does the opposite of a smooth annual forecast: it often arrives in large, irregular amounts.
Using zero vacancy and a token maintenance figure turns a calculator into a sales illustration. A useful model uses a normal allowance and at least one severe stress case.
The calculation, step by step
Vacancy weeks
Reduce annual rent by the expected empty period.
In the calculator, this item should be entered separately so a change in vacancy weeks can be tested without hiding it inside another assumption.
Management and letting
A new tenancy may trigger advertising and letting fees in addition to management.
In the calculator, this item should be entered separately so a change in management and letting can be tested without hiding it inside another assumption.
Routine maintenance
Appliances, plumbing, electrical, painting and safety work recur.
In the calculator, this item should be entered separately so a change in routine maintenance can be tested without hiding it inside another assumption.
Capital replacements
Roof, hot water, air conditioning and strata levies can dominate a year.
In the calculator, this item should be entered separately so a change in capital replacements can be tested without hiding it inside another assumption.
Rent loss during repairs
Major work can combine cost with vacancy.
In the calculator, this item should be entered separately so a change in rent loss during repairs can be tested without hiding it inside another assumption.
Insurance limits
Policies can reduce losses but include excesses, exclusions and claim delays.
In the calculator, this item should be entered separately so a change in insurance limits can be tested without hiding it inside another assumption.
Worked Australian example
At $650 a week, two vacant weeks cost $1,300 before re-letting fees. A $4,000 hot-water and electrical event can turn an apparently positive $3,000 annual cash flow into a $2,300 loss.
Run the ROI calculator with normal maintenance, then add a one-off $10,000 event and extra vacancy. The investment should remain financeable even if the return becomes temporarily poor.
Decision checklist
| Step | What to confirm |
|---|---|
| 1 | Use local vacancy history cautiously. |
| 2 | Inspect property age and condition. |
| 3 | Create a sinking fund. |
| 4 | Model one major repair. |
| 5 | Do not spend the entire rental surplus. |
Use the calculator with this guide
Common mistakes
- Using 52 weeks rent every year.
- Setting maintenance to zero on a renovated property.
- Ignoring strata special levies.
- Assuming insurance pays immediately and fully.
- Using average costs without a cash buffer.
Questions to answer before acting
- Use local vacancy history cautiously.
- Inspect property age and condition.
- Create a sinking fund.
- Model one major repair.
- Do not spend the entire rental surplus.
Record keeping and review
For this calculation, retain the evidence behind vacancy weeks and management and letting.
Official sources
Related guides
Frequently asked questions
How many vacancy weeks should be assumed?
Use local evidence and test a higher number; no single allowance fits every market.
What maintenance percentage is correct?
Property condition and type matter more than a universal percentage.
Should capital works be annualised?
For planning, create a reserve; tax treatment is separate.
Can rent increases offset repairs?
Only if achieved and sustainable; do not rely on them for emergency affordability.
How large should the buffer be?
Enough for likely excesses, vacancy and a major repair relative to the property.
Bottom line
Vacancy and maintenance are not edge cases; they are recurring features of property ownership that belong in the base plan.