The short answer: no, stamp duty is not an annual tax deduction — not on your home, not on your investment property, not on anything. But on investment property, it's added to the CGT cost base, which reduces the capital gain on sale and delivers a tax saving years or decades later. Understanding this distinction — capital cost vs operating expense — is the difference between incorrectly claiming stamp duty every year (and getting audited) and correctly banking the deferred benefit.
Capital costCGT cost baseITAA s110-25
Why stamp duty isn't an annual deduction
Australian income tax law distinguishes between revenue expenses (deductible in the year incurred) and capital expenses (not immediately deductible, but recovered through depreciation or CGT cost base).
Stamp duty paid on a property purchase is unambiguously a capital expense. It's paid once, as part of acquiring the asset, and delivers an enduring benefit (ownership of the property) rather than a recurring income-producing service. The same logic applies to legal fees, building inspections, and loan establishment costs — each a one-off acquisition cost, not an annual operating expense.
Trying to claim stamp duty as an annual deduction is a common beginner error. The ATO's rental property guidance lists stamp duty explicitly as a non-deductible capital cost. An inadvertent claim will be reversed on audit, typically with interest and sometimes penalties.
How stamp duty helps at sale (investment property)
Under section 110-25 of the Income Tax Assessment Act 1997, the CGT cost base of an asset includes:
→First element — the money or value you paid to acquire the asset (purchase price).
→Second element — incidental costs of acquisition and disposal — stamp duty, legal fees, conveyancing, valuations, broker's fees.
→Third element — non-capital holding costs not otherwise deductible (relevant where you held the property without generating rental income).
→Fourth element — capital improvements to the asset.
→Fifth element — costs of establishing, preserving, or defending your title.
Stamp duty fits in the second element. When you sell, the capital gain is:
Capital gain = Sale price − (Purchase price + Stamp duty + Other incidental costs)
Adding stamp duty to the cost base directly reduces the taxable gain dollar-for-dollar.
Worked example: $800k NSW investment property
An investor buys an investment property in NSW for $800,000. NSW transfer duty on an $800k residential property (non-first-home-buyer, investor) is approximately $31,000. They hold the property for 10 years. In year 10 they sell for $1,300,000.
Scenario A — without cost base (incorrect)
→Capital gain: $1,300,000 − $800,000 = $500,000
→After 50% CGT discount: $250,000 taxable
→Tax at 39% marginal rate: $97,500
Scenario B — stamp duty in cost base
→Cost base: $800,000 + $31,000 = $831,000
→Capital gain: $1,300,000 − $831,000 = $469,000
→After 50% CGT discount: $234,500 taxable
→Tax at 39% marginal rate: $91,455
→Saving from cost base: $6,045
In this example, including stamp duty in the cost base saves $6,045 of CGT. That's a 19.5% recovery of the $31,000 paid ($31,000 × 50% discount × 39% marginal rate = $6,045). Compare this to: annual deduction at full 39% marginal rate would have saved $12,090 — but that option isn't available.
Practical reading
You recover roughly 16–24% of stamp duty in deferred CGT savings, depending on your marginal rate at sale. It's a real benefit — but materially smaller than a direct deduction would be, and only realised on sale.
What about your home?
On a principal place of residence, stamp duty produces no tax benefit whatsoever. The reasons:
→No annual deduction (not income-producing).
→CGT cost base additions don't matter because the PPOR is CGT-exempt on sale.
→The only way to reduce stamp duty on a home is through state-based concessions at the time of purchase.
Use first home buyer concessions where available — these can eliminate stamp duty entirely in most states below certain price caps. Check state-specific calculators:
A separate state-based duty — sometimes called "mortgage duty" or "loan duty" — used to apply to the registration of mortgages. Most states have abolished it on residential loans. Where it still applies (usually small amounts on commercial loans), it's treated as a borrowing expense.
Borrowing expenses are deductible over 5 years or the loan term, whichever is shorter. This includes loan application fees, LMI, and mortgage duty where charged. The deduction is claimed annually in equal 1/5 portions (pro-rated for the first and fifth years) on investment loans only.
To be clear: property transfer stamp duty and mortgage duty are different. Property transfer duty is capital and non-deductible. Mortgage duty, where charged, is a borrowing cost and deductible over 5 years.
Vehicle and equipment stamp duty
Stamp duty on vehicles and business equipment follows the same capital principle: it's added to the depreciable cost of the asset and recovered through depreciation over the asset's effective life.
For an income-producing vehicle (such as a tradesperson's ute or a business fleet car):
→Depreciation claimed annually using prime cost or diminishing value.
→Car limit applies (currently $68,108 for 2024-25 — check ATO for current limit).
→Above the car limit, depreciation is capped — any stamp duty that pushes cost above the limit is effectively lost for tax purposes.
For a personal-use vehicle, no deduction applies and stamp duty has no tax relevance.
Record-keeping requirements
The ATO can request evidence of cost base elements decades after the property is sold. Keep:
→The signed contract of sale showing the purchase price.
→The settlement statement itemising stamp duty, conveyancing, and registration fees.
→Separate invoices for building/pest inspections, valuations, and pre-purchase reports.
→Any evidence of capital improvements during ownership (fourth cost-base element).
Scan everything to PDF at purchase and store in a dedicated folder. Relying on finding paper records 15 years after settlement is a recipe for disputed cost base calculations.
Common errors to avoid
→Claiming stamp duty as an annual deduction — ATO's rental property guide explicitly lists stamp duty as non-deductible. This claim gets reversed on audit.
→Forgetting stamp duty at sale — Decades later, investors often forget the exact stamp duty paid and omit it from the cost base calculation — overpaying CGT.
→Confusing property stamp duty with mortgage duty — Different treatment: transfer duty is capital, mortgage duty is a 5-year borrowing expense.
→Claiming stamp duty on a PPOR in tax planning — No tax benefit exists — the only saving is at the time of purchase via state concessions.
→Missing capital improvement expenditure — Renovations, additions, and major improvements are also cost base items (4th element) — track them.
Is stamp duty tax deductible on investment property?
Not immediately. Stamp duty paid on purchase is a capital cost, not an annual operating expense, so you cannot claim it as a deduction against rental income. Instead, it's added to the property's cost base — reducing the capital gain (and CGT) when you eventually sell.
Is stamp duty deductible on my principal place of residence?
No. There's no income tax deduction for stamp duty on a home you live in, and because the PPOR is CGT-exempt, there's no cost base benefit either. The only way stamp duty saves you tax on a PPOR is through state-based first home buyer concessions that reduce or eliminate the stamp duty itself.
What about stamp duty on the mortgage?
Some states charge mortgage duty or loan duty. Where payable, it's deductible as a borrowing expense over 5 years (or the loan term if shorter) on an investment loan. Not deductible on a home loan for your PPOR. Most states have abolished mortgage duty on residential loans — check your state.
Can I claim stamp duty on equipment or vehicles?
Vehicle stamp duty on a business or income-producing vehicle is typically deductible through the depreciation schedule (it's added to the vehicle's cost for depreciation). Stamp duty on business equipment follows similar rules — capital expenditure, recovered through depreciation over the asset's effective life rather than immediate deduction.
How does stamp duty affect my CGT calculation?
Stamp duty on purchase is added to the CGT cost base (second element — incidental costs of acquisition). When you sell the property, the gain is calculated as sale price minus the cost base (purchase price + stamp duty + other eligible incidental costs). This reduces your taxable gain dollar-for-dollar. With the 50% CGT discount, each dollar of stamp duty saves roughly your marginal rate × 50%.
What other purchase costs can be added to the cost base?
Cost base inclusions: purchase price, stamp duty, conveyancing/legal fees, building and pest inspection fees, advertising costs for the purchase, loan application fees (if not already claimed as borrowing costs), valuations required for purchase, and search/settlement fees. Maintain records — the ATO can request evidence decades after the sale.
Is stamp duty on a new build different?
Stamp duty is usually calculated on the contract price for an established property or the land-only value for off-the-plan and new builds. The deductibility treatment is identical — cost base addition, not annual deduction — regardless of new vs established.
Can I claim the borrowing costs associated with stamp duty?
If you borrowed the stamp duty as part of your loan, the interest on that portion of the loan is deductible (proportional to income-producing use). The stamp duty itself remains non-deductible annually and a cost-base item. The loan establishment fees, LMI, and other borrowing costs are deductible over 5 years separately.
What about first home buyer stamp duty concessions?
First home buyer concessions reduce or eliminate the stamp duty you pay in the first place. Each state runs its own scheme with different price caps and thresholds. These are direct savings, not deductions — they lower the cash cost of the property without any tax return impact.
Tax Accuracy & Sources
Reviewed: March 2026 · Tax year: 2025-26
This guide covers the deductibility and cost-base treatment of Australian stamp duty and related state transfer duties for 2025-26. Rules around cost base elements are governed by Division 110 of ITAA 1997. State-specific duty rates, concessions, and mortgage duty treatment vary — consult individual state revenue offices or use our state calculators for current figures.