In today’s economy, many Australians are finding smart ways to supplement their income, and renting a granny flat is quickly becoming a popular choice. Whether you’re housing ageing parents, offering affordable rentals, or making use of your backyard space, it’s essential to understand the tax implications before diving in.
At Endurego Tax, we work closely with homeowners across Sydney and the Inner West to ensure they’re making informed decisions. Let’s break down what you need to know if you’re thinking about turning your granny flat into a source of income.
Why Renting Out a Granny Flat Makes Sense in 2025
With rising interest rates and cost-of-living pressures, more Aussies are exploring secondary income streams. The granny flat rental market is seeing growth as families look for flexible housing options without long-term commitments.
Whether you’re offering it to students, retirees, or young professionals, it’s crucial to treat this like any other rental property investment, especially when it comes to your taxes.
Is Income from a Granny Flat Taxable?
Yes—granny flat income is considered taxable by the ATO. This means you’ll need to declare any rental income on your tax return. But don’t worry, it also opens the door for rental property deductions, such as:
- Council rates and utilities (if you cover them)
- Depreciation of the structure
- Repairs and maintenance
- Insurance
Just like with any rental property, keeping accurate records is key. At Endurego Tax, we help you track and categorise these expenses properly so you can maximise your legal deductions.
ATO Rules on Granny Flats: What’s Changed?
The ATO has updated its view on granny flat arrangements, especially after the 2021 reforms aimed at protecting vulnerable family members. While these changes mainly address granny flat rights for family care agreements, they also remind homeowners that informal or undocumented arrangements can lead to disputes—and possibly tax complications.
Our tip? If you’re renting to a family member or friend, always have a granny flat rental agreement in place. It helps keep things transparent and can serve as evidence in case the ATO has questions.
GST and Capital Gains Tax (CGT) on Granny Flats
For most homeowners renting out a granny flat on their primary residence, GST won’t apply. But when it comes to selling your home later, Capital Gains Tax could kick in on the portion of your home used to generate rental income.
👉 Real-life example:
We recently helped a client in Ashfield who rented out their backyard granny flat for two years. When they sold their home, only the portion of the property used as their main residence was exempt from CGT. Because we had detailed rental and depreciation records, we were able to minimise their CGT liability significantly.
When Is It Tax-Free?
There’s a big difference between a commercial rental arrangement and providing accommodation to an ageing parent without charging rent. If no money changes hands, there’s generally no tax impact.
However, even informal arrangements can have implications, especially if legal agreements are drawn up to protect elder care rights.
Need help understanding where you stand? We’re here to offer clarity with a personal touch.
Final Tips from Endurego Tax
- Keep a signed rental agreement for granny flats rented out to anyone.
- Record all income and related expenses from day one.
- Get professional advice before starting, especially if you’re renting to family.
- Think long term: CGT and ATO rules can affect you when you eventually sell.
Talk to Us Before You Rent That Granny Flat
At Endurego Tax, we believe in making tax understandable—and personal. We take the time to get to know your situation, so you’re not just another number in the system. If you’re thinking about renting a granny flat, let’s chat about how to set it up the right way.
Let’s make the numbers work for your goals—without any surprises at tax time.
📍 Based in Ashfield and serving clients throughout Inner West Sydney.
📞 Book your tax consultation today with Endurego Tax.
