Is Stamp Duty Tax Deductible? (Investment Property)

Stamp duty is one of the largest upfront costs when buying an investment property in Australia — often $20,000 to $50,000 or more. Many investors want to know whether they can claim it as a tax deduction. The short answer: no, stamp duty on a property purchase is not an immediate tax deduction. But it is not lost money either. Every dollar of stamp duty you pay is added to your CGT cost base, which reduces your capital gain — and your tax — when you eventually sell.

The short answer: not deductible, but not wasted

Stamp duty (also called transfer duty) paid on purchasing a property is classified by the ATO as a capital expense — specifically, an incidental cost of acquiring the asset. Capital expenses cannot be claimed as immediate deductions against your rental income. You will not find a line item for stamp duty on the rental property schedule of your tax return.

However, stamp duty is included in your CGT cost base under Element 2 (incidental costs). When you sell the property, your capital gain is calculated as:

Capital gain = Sale price − Cost base

The higher your cost base, the smaller your capital gain, and the less CGT you pay. So while stamp duty does not reduce this year’s tax bill, it reduces a future tax bill — potentially by a significant amount.

Source: ATO — Cost base of assets, retrieved 17 Feb 2026.

Three types of stamp duty — three different tax treatments

Not all stamp duty is treated the same way. The ATO distinguishes between stamp duty on the property transfer, stamp duty on a mortgage, and stamp duty on a lease. Many investors confuse the first two, which can lead to missed deductions or incorrect claims.

1. Stamp duty on the property transfer (NOT deductible)

This is the large payment at settlement — typically 2% to 6% of the purchase price depending on your state and whether you qualify for concessions. It is a capital expense included in your CGT cost base. It is not deductible against rental income in any year.

2. Stamp duty on a mortgage (IS deductible)

Some states charge a separate (usually smaller) duty on the mortgage instrument itself. This is treated as a borrowing expense, not a capital expense. Borrowing expenses are deductible over 5 years or the term of the loan, whichever is shorter. If your total borrowing costs for the year are $100 or less, you can claim the full amount in the year incurred.

Other borrowing expenses claimed the same way include loan establishment fees, lenders mortgage insurance (LMI), title search fees for the lender, and mortgage broker fees.

Source: ATO — Borrowing expenses, retrieved 17 Feb 2026.

3. Stamp duty on a lease (IS deductible)

Stamp duty paid on a lease — for example, an ACT crown lease — is generally deductible, apportioned to the rental use of the property. This is a less common situation but relevant for ACT investors in particular.

How stamp duty reduces your capital gains tax

When you sell your investment property, the ATO calculates your capital gain using five cost base elements. Stamp duty sits in Element 2.

The five elements of the CGT cost base

For most property investors, Elements 1, 2, and 4 make up almost the entire cost base. Element 3 is generally nil because rental property owners have already claimed holding costs (rates, insurance, interest) as income tax deductions. Element 5 is uncommon.

Source: ATO — Cost base of assets, retrieved 17 Feb 2026.

What other purchase costs go into Element 2?

Stamp duty is not the only incidental cost added to your cost base. Element 2 includes all costs directly related to the acquisition or disposal of the property:

• Stamp duty / transfer duty on the property transfer
• Conveyancing and legal fees (both on purchase and sale)
• Real estate agent commissions (on purchase if applicable, and on sale)
• Surveyor and valuer fees
• Auctioneer fees
• Accountant fees directly related to the transaction
• Title search fees (for the purchaser, not the lender’s title search)
• Advertising and marketing costs on sale
• Consultant fees directly related to acquisition or disposal

Keep records of every one of these costs. Together with stamp duty, they can add $30,000 to $60,000 or more to your cost base — reducing your taxable capital gain by the same amount.

Worked example: how stamp duty saves tax on sale

Michael buys an investment property in Sydney in July 2020.

Purchase costs:

Michael holds the property for 6 years and sells in July 2026 for $1,050,000.

Sale costs:

CGT calculation:

Without stamp duty in the cost base, the capital gain would be $242,065 + $29,585 = $271,650, and the taxable gain after the 50% discount would be $135,825.

The stamp duty saved Michael:

• Taxable capital gain reduced by: $29,585 x 50% = $14,793
• At a 37% marginal rate (income $135,001 to $190,000): $14,793 x 37% = $5,473 in tax saved
• At a 45% marginal rate (income over $190,000): $14,793 x 45% = $6,657 in tax saved

In this example, the stamp duty included in the cost base reduced the CGT liability by several thousand dollars. The tax saving depends on the investor’s marginal rate at the time of sale.

Source: ATO — CGT when selling your rental property, retrieved 17 Feb 2026.

Owner-occupied vs investment property

The tax treatment of stamp duty depends on how you use the property.

Investment property

Stamp duty is included in the CGT cost base (Element 2). When you sell, it reduces your taxable capital gain as shown in the worked example above. This applies to all investment properties — residential, commercial, and vacant land held for investment.

Owner-occupied (main residence)

If the property is your main residence and qualifies for the full main residence CGT exemption, the cost base is not relevant — because the entire capital gain is exempt from CGT. In this case, stamp duty provides no direct tax benefit. You pay it as a cost of buying the home, and it has no impact on your tax return.

Partial main residence exemption

If you lived in the property for part of the ownership period and rented it out for the rest, a partial main residence exemption may apply. In this case, the cost base (including stamp duty) is used to calculate the portion of the gain that is taxable. Stamp duty still helps reduce the taxable portion.

Transfer duty vs stamp duty: the same tax

Different states use different names for the same tax:

The ATO uses both “stamp duty” and “transfer duty” in its guidance. The tax treatment is identical regardless of the term your state uses. Throughout this guide, we use “stamp duty” as the more commonly searched term, but the rules apply equally to transfer duty.

What about first home buyer concessions and exemptions?

If you received a stamp duty concession or exemption as a first home buyer, your cost base reflects the amount you actually paid — not the amount you would have paid without the concession. For example, if full stamp duty would have been $25,000 but you received a first home buyer exemption and paid $0, your cost base does not include any stamp duty amount.

This matters if you later convert the property to an investment and eventually sell. Your cost base will be lower, and the taxable capital gain will be correspondingly higher. Keep your original settlement statement showing the concession received.

Record-keeping requirements

The ATO requires you to keep records of all costs included in your CGT cost base for the entire period you own the property, plus 5 years after you lodge the tax return for the year you sell. For a property held 10 years, that means keeping records for 15 years or more.

Key documents to retain:

• Settlement statement showing stamp duty paid
• Transfer duty receipt from your state revenue office
• Conveyancing invoices (purchase and sale)
• Renovation and improvement receipts (Element 4)
• Agent commission invoices on sale
• Loan documents (if claiming mortgage stamp duty as a borrowing expense)

Store digital copies in addition to paper records. The ATO accepts electronic records provided they are legible and complete.

Source: ATO — Rental expenses 2025, retrieved 17 Feb 2026.

Summary

Stamp duty on a property purchase is not deductible from your rental income, but every dollar is added to your CGT cost base. When you sell, it directly reduces your taxable capital gain. For an investor on a 37% marginal rate selling with the 50% CGT discount, $30,000 in stamp duty can save over $5,000 in tax. Keep your settlement statement and transfer duty receipt for the entire time you own the property — you will need them when you sell.

Estimates only. This is general information, not tax or financial advice. Tax rules change and individual circumstances vary. Consult a registered tax agent or accountant for advice specific to your situation. We are not affiliated with the ATO or any state revenue office.