5 Costs That Decide Your Tax When Selling a House in Australia

Last Updated: October 28, 2026

Table of Contents

• Does Selling Your Home Always Mean Paying Tax?
• How the Main Residence Exemption Works
• Step 1: Work Out Whether the Property Was Your Main Residence
• Step 2: Calculate Your Capital Gain
  • Applying the 50% Discount
• Step 3: Use a Capital Gains Tax Calculator Australia to Check Your Figures
• Selling as a Non-Resident: Withholding and Final Tax
• Common Mistakes When Reporting a Property Sale
• What to Do Before You List Your Property
• Booking a Free Appraisal to Plan Your Sale
• Frequently Asked Questions

Does Selling Your Home Always Mean Paying Tax?

Not always. Selling a house does not automatically mean you owe capital gains tax. The tax outcome depends on how the property was used and whether you qualify for an exemption, so the sale itself is only the starting point.

Australian Taxation Office guidance on capital gains tax and property sets out when a gain is taxable and when it is not. Read it alongside your own situation, because two sales at the same price can produce very different results.

How the Main Residence Exemption Works

The main residence exemption is the rule most home sellers rely on. A home you lived in as your principal place of residence can be fully or partly exempt from capital gains tax.

Here is how it generally works:

• Full exemption: You lived in the home for the whole time you owned it.
• Partial exemption: You moved out and rented it, or used part of it for business.
• Partial exemption for absences: Some periods away may still count if the home was not rented out.

Keep records of when you moved in and out.

Step 1: Work Out Whether the Property Was Your Main Residence

Start by checking how the home was used across every year you owned it.

Ask yourself these questions:

• Did I live there as my main home?
• Did I rent it out, and for how long?
• Did I move out and return later?

Write down each date. A clear timeline makes the next steps much easier.

Step 2: Calculate Your Capital Gain

Your capital gain is the difference between what you sold the property for and what it cost you, plus allowable costs. Work through it in order.

1. Start with the sale price.
2. Subtract the original purchase price.
3. Add purchase costs such as legal fees and stamp duty.
4. Add improvement costs, such as a kitchen renovation.
5. Subtract selling costs, such as agent commission and marketing.

The result is your capital gain before any discount or exemption.

Applying the 50% Discount

If you owned the property for more than 12 months and it was not fully exempt, you may be able to apply a 50% discount to the taxable gain. Individuals commonly qualify for this discount, though the rules vary for companies and trusts.

For example, a taxable gain of $200,000 would become $100,000 after the discount. Confirm the details with the Australian Taxation Office before you rely on the figure.

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Step 3: Use a Capital Gains Tax Calculator Australia to Check Your Figures

Once you have your gain, a calculator helps you test different scenarios quickly. Enter the sale price, purchase price, costs and the number of years you lived in the home.

Use a Australian government capital gains tax guidance reference to check each input. Mistakes in dates or costs are the most common reason estimates go wrong.

A calculator shows an estimate, not a final bill. For a precise figure, speak to a registered tax agent. You can also use our selling property costs calculator to estimate the full costs of selling and see what you may keep.

Selling as a Non-Resident: Withholding and Final Tax

Non-residents face extra rules. When a foreign resident sells Australian property, the buyer may need to withhold part of the price at settlement. The withholding rate is currently 15% for contracts entered into on or after 1 January 2025, according to Expat US Tax guidance on Australian property withholding.

Withholding is not the same as your final tax. The amount withheld is credited against the tax you actually owe, so you may get a refund or owe more. Non-residents who want the full rules should read our guide to selling property as a non-resident in Australia.

Common Mistakes When Reporting a Property Sale

Many sellers make the same avoidable errors:

• Forgetting to record the date they moved out
• Leaving out renovation costs that could reduce the gain
• Assuming the withheld amount is the final tax bill
• Missing the settlement date, which controls which tax year the sale falls in
• Not keeping receipts for at least five years after the sale

Keep every receipt and contract. They are your evidence if the figures are ever checked.

What to Do Before You List Your Property

Our step-by-step checklist for getting a property sale-ready covers the wider preparation work.

Booking a Free Appraisal to Plan Your Sale

At Wiseman Realty, our team in Lakemba can discuss your property sale. Request a free appraisal when you are ready. Our full guide to selling a house in Sydney walks through the whole process, from preparation to settlement.

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