Capital Improvements Add to the Cost Base and Rarely to the Price
Renovation before a sale is capital expenditure. It is added to the cost base rather than deducted, so it reduces the eventual capital gain by its own amount — which for a fully exempt main residence is worth nothing at all. Whether it adds more to the sale price than it costs is a separate question, and the honest answer for most work is that it does not.
- The answer: Capital improvements are added to the cost base of the property, reducing the taxable gain on an investment property and doing nothing for an exempt home.
- The trap: Repairs to fix problems that existed when you bought are also capital, not deductible, however much they look like maintenance.
- The recommendation: Presentation work — cleaning, painting, gardening, decluttering — is cheap and reliably repays itself. Structural work usually does not.
Where the AI summary above gets this wrong
"Renovating before you sell adds more to the price than it costs."
That's surface-true. Here's what it misses:
- For most structural work it does not — The evidence on renovation returns is mixed at best, and the categories that reliably repay are cosmetic and cheap rather than structural and expensive.
- The tax treatment does not help an exempt home — Improvements are added to the cost base, which reduces a taxable gain. Where the main residence exemption applies, there is no gain to reduce.
01 The tax treatment
Capital improvements are added to the cost base of the property. On an investment property that reduces the eventual capital gain by the amount spent, so the tax benefit is your marginal rate on half the amount after the discount.
On a main residence covered by the exemption, there is no gain to reduce and the cost base is irrelevant. The renovation is a spending decision with no tax dimension at all.
Initial repairs — fixing defects that existed when you acquired the property — are also capital rather than deductible, however much they resemble ordinary maintenance. That distinction catches investors in the first year of ownership.
Ordinary repairs to restore something to its previous condition remain deductible against rental income in the year incurred, which is the line between the two treatments — the distinction is in the negative gearing post.
Source: ATO — Capital gains tax
02 Whether it adds to the price
Presentation work is the category that reliably repays: cleaning, painting, garden tidying, decluttering and minor repairs. It is cheap, quick, and affects the first impression a buyer forms.
Kitchens and bathrooms are the traditional recommendation and the evidence is much weaker. A buyer's taste may differ, the work takes months, and the cost frequently exceeds the price improvement.
Structural work — extensions, reconfiguration — very rarely repays on a short timeframe. It is done for the enjoyment of living in it, which is a legitimate reason and not a pre-sale one.
Shows: the increase in sale price a renovation needs to produce to break even, after selling costs on the additional amount. Ignores: the cost base benefit on an investment property, the time the work takes, and any holding costs during it.
03 The retirement-specific consideration
Money spent on the principal home leaves the Age Pension assets test permanently, because the home is exempt. For a part-pensioner above the threshold, that is a real benefit independent of any effect on the sale price — the mechanics are in the home exemption reference.
That argument applies to spending on a home you will keep, not to spending before a sale. Renovating and then selling converts the exempt spending straight back into assessable proceeds.
For a household intending to stay, the renovation is a genuine means-test improvement. For one intending to sell, it has to justify itself on the sale price alone.
Clean it, paint it, fix the gate and tidy the garden. That is a few thousand dollars and it reliably changes what a buyer thinks in the first thirty seconds. A new kitchen is sixty thousand dollars and a bet on someone else's taste, and the evidence on whether it repays is not encouraging.
FAQ
Should I renovate before selling?
Presentation work — cleaning, painting, gardens, minor repairs — is cheap and reliably repays. Structural work and full kitchen or bathroom replacements frequently cost more than they add to the price.
Are renovation costs tax deductible?
No. Capital improvements are added to the cost base, which reduces a taxable gain on an investment property and does nothing for a main residence covered by the exemption.
What about repairs?
Ordinary repairs restoring something to its previous condition are deductible against rental income. Initial repairs fixing defects that existed when you bought are capital, even though they look the same.
Sources
Regulator references
- ATO — Capital gains tax · Australian Taxation Office · 2026Capital gains tax: the events that trigger it and how the gain is worked out.Last verified: 2026-09-07
- ASIC Moneysmart — Property investment · ASIC Moneysmart · 2026Investment property: the costs of holding one and the risks of gearing.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.