Key Points
Family guarantees for first-home buyers fell from 6.4% in February to under 4% in June after budget announcement.
New home construction costs could rise by $100,000 as demand for materials surges before July 2027 tax changes take effect.
Rentvesting buyers are rushing to purchase investment properties before negative gearing and capital gains tax benefits shrink.
About 64% of first-home buyers with parental support have no written agreement, risking lender rejection and family disputes.
Young Australians are racing to buy investment properties before the 2026 federal budget’s tax changes take effect on July 1, 2027, but the rush is colliding with a sharp pullback from parents. Industry data shows the share of new buyers using family guarantees fell from 6.4% in February to under 4% in June. Westpac warns that new home construction costs could balloon by $100,000 as demand for building materials surges, leaving first-home buyers caught between rising prices and shrinking family support.
Why parents are pulling back on guarantees
The mood among parents has shifted dramatically since the budget announcement. A family guarantee typically lets a parent use equity in their own home to help a child qualify for a mortgage with a smaller deposit, but the parent’s property remains tied to the loan if prices fall or the borrower struggles. In a softening market, that risk looks far less manageable than it did during years of rising property values. Brokers report weaker first-home buyer borrowing activity and more caution from parents, signalling that the bridge between older housing wealth and younger buyers is narrowing.
The race against July 2027 tax changes
New builds are exempt from the diminishing tax concessions announced in the budget, creating a loophole that has sparked panic among rentvesting buyers. Rentvesting means buying an investment property in an affordable area while continuing to rent where you want to live. Westpac research shows the window for affordable new property is closing as younger buyers turn to their parents for help before costs skyrocket. Lachlan Brook, 31, a Sydney pilot, purchased an investment property in Melbourne’s west partly through contributions from his parents, who acted as guarantors to help him avoid lenders mortgage insurance.
What the budget changes mean for investors
The 2026 federal budget introduced major changes to negative gearing and the capital gains tax discount, set to apply from July 1, 2027. Negative gearing allows investors to claim losses against other income; the changes will reduce that benefit. The capital gains tax discount, which currently lets investors exclude 50% of gains from tax, will shrink. Industry data suggests family support weakens when confidence falls, because first-home buyers lose not just deposit help but also the borrowing confidence that turns market activity. If family guarantees disappear, the entire pipeline of younger buyers entering the market could slow.
The cost of family help and the paperwork problem
An estimated 60% of first-home buyers have received financial assistance from parents, with amounts averaging more than $30,000. Yet as many as 64% of those buyers have no written agreement in place, which complicates dealings with lenders. When a lender asks whether money from Mum and Dad is a gift or a loan, the answer affects whether the bank counts repayments to parents as a debt against the buyer’s borrowing capacity. Without clear paperwork, disputes can arise later, especially if the buyer’s income drops or property values fall and the parent’s equity becomes exposed.
Final Thoughts
The federal budget has created a two-way squeeze: younger buyers must act before July 2027 to avoid harsher tax treatment, but parents are retreating from guarantees as the market softens. Without family support, first-home buyers face higher deposit hurdles and slower entry into the market.
FAQs
Parents grew more cautious as the market softened and the budget signalled tougher tax treatment for investors. When property values stop rising, the risk of a family guarantee—where the parent’s home is tied to the loan—becomes harder to justify.
Rentvesting means buying an investment property in an affordable area while renting where you want to live. Young buyers are rushing because new builds are exempt from the budget’s negative gearing and capital gains tax changes, creating a loophole that closes July 1, 2027.
An estimated 60% of first-home buyers receive family help averaging more than $30,000. The money can be a gift, a loan, or a guarantee on the mortgage itself.
About 64% of first-home buyers with family support have no written agreement. Lenders may refuse to count the arrangement, complicating the buyer’s borrowing capacity and creating disputes if circumstances change.
Disclaimer:
The content shared by Meyka AI PTY LTD is solely for research and informational purposes. Meyka is not a financial advisory service, and the information provided should not be considered investment or trading advice.
About Author

Huzaifa Zahoor
Co FounderHuzaifa Zahoor is the engineer who built Meyka. He has spent years writing Python, training AI models, and building data pipelines specifically for financial markets. His technical articles have reached over 30,000 readers on Medium, so he knows how to make complex things easy to follow. If this article touches on how the tools work, he is the person who actually built them.
What brings you to Meyka?
Pick what interests you most and we will get you started.
I'm here to read news
Find more articles like this one
I'm here to research stocks
Ask Meyka Analyst about any stock
I'm here to track my Portfolio
Get daily updates and alerts (coming March 2026)