Is Stamp Duty Tax Deductible?

Every new property owner asks the same question at tax time: can I claim back the stamp duty?

Short answer: no — not as a yearly deduction, not even on an investment property. But the money isn't wasted for tax purposes; it plays a long game. And if you bought in Canberra, the rules flip entirely, thanks to a quirk involving 99-year leases.

Tax law sorts property costs into two buckets. Running costs — interest, rates, insurance, repairs on a rental — are deductible each year because they're the cost of earning rent. Capital costs are the cost of acquiring the asset itself, and stamp duty sits squarely there, along with conveyancing fees and buyer's agent fees.

Stamp duty didn't help you earn this year's rent — it bought you the property. So it's treated as part of the purchase price.

That applies to investors and owner-occupiers alike: no annual deduction, no spreading it over five years.

Stamp duty gets added to your property's cost base — the total the ATO treats as what the property cost you: purchase price plus buying costs like duty and legals. When you sell, your capital gain is the sale price minus that cost base. Bigger cost base, smaller gain, less capital gains tax.

Numbers: buy an investment property for $800,000 with $32,000 stamp duty, sell years later for $1,100,000. Without the duty in your cost base, your gain is $300,000; with it, $268,000. Hold longer than 12 months and the 50% CGT discount halves the taxable gain — so the duty trims $16,000 off your taxable income at sale. At a 37% marginal rate plus Medicare, that's roughly $6,200 of real tax saved.

Not the yearly deduction you wanted, but far from nothing — provided you can still prove you paid it, possibly decades later.

In the ACT, you don't technically buy land — nearly all property sits on 99-year Crown leases from the government. You're buying a very long lease, not freehold land.

That changes the tax treatment. Costs of acquiring a lease on an income-producing property — including stamp duty — are deductible as a lease expense. Buy an investment property in Canberra, rent it out, and your stamp duty is generally claimable in the year you pay it — not drip-fed over decades via the cost base.

On a Canberra investment unit with, say, $20,000 of duty, that's a $20,000 deduction in year one — for an investor on the 37% rate plus Medicare, nearly $8,000 back at the very first tax time.

For investors, everything above applies: no yearly deduction (outside the ACT), cost base at sale, keep the records. Plenty of other costs are deductible every year — loan interest, rates, insurance, property management, repairs — which is the machinery behind negative gearing, where a rental's costs exceed its rent and the loss reduces your other taxable income.

For owner-occupiers, your home is generally exempt from CGT under the main residence exemption, so the cost base usually never gets used — there's no taxable gain to reduce. Stamp duty on your own home is just the price of admission.

One caveat: rent out your home later, or use part of it to run a business, and part of the CGT exemption can fall away — at which point that cost base, stamp duty included, matters again. Keep the paperwork.

Stamp duty: never a yearly deduction (except ACT investment properties, thanks to the Crown lease quirk), always a cost base entry that shrinks your CGT when you sell — if you're an investor and you kept the paperwork.

Before you buy, size up the duty with our stamp duty calculator, then preview the eventual sale in the CGT calculator.