An adult child in a second home on the parents' block is a first home with no deposit, no landlord and no commute to Sunday lunch. The law allows it without conditions: since 2022 a secondary dwelling may be occupied by anyone, and a child paying board is a domestic arrangement that costs the parents no tax and no capital gains exemption. The money saved is the point, and the government's first home schemes are built for the next step: the First Home Super Saver Scheme lets a saver put up to $50,000 of voluntary contributions through super at lower tax, the 5% Deposit Scheme removes lenders mortgage insurance, and Help to Buy puts the government in for up to 40% of a new home with a 2% deposit. None of the three can buy the backyard home itself, because the child would be buying a house they already live in on land they do not own.
What the law says about a child in the flat
- Who may live there. Anyone, related or not, since 26 September 2022, in every Queensland council area. No condition on the approval ties it to family.
- Board, not rent. A child paying toward the household's costs is a domestic arrangement under the ATO's rules: not the parents' income, no deductions, and the main residence exemption from capital gains tax is kept in full. Charge market rent and the flat becomes a rental for tax. Renting to family.
- Tenancy law. Does not apply to a family member paying board. It applies the moment there is rent and an agreement.
- The home stays the parents'. It cannot be sold off separately; it is part of the lot and the title. If the plan is for the child to own something, it is the next home, not this one.
The schemes for the next home
| Scheme | What it does | What it cannot do |
|---|---|---|
| First Home Super Saver Scheme | Voluntary super contributions, up to $50,000 plus earnings, released to buy or build a first home, taxed at super rates on the way in | Fund a home the saver will not own |
| Australian Government 5% Deposit Scheme | A first home with a 5% deposit and no lenders mortgage insurance, no income cap, 2% for single parents | Apply to land the buyer does not own |
| Help to Buy | A 2% deposit with the government holding up to 40% of a new home or 30% of an existing one, income at or below $103,000 single or $165,000 joint, 10,000 places a year since 5 December 2025 | Help anyone who already owns property, or fund a dwelling on someone else's land |
| Queensland Boost to Buy | A 2% deposit on a home up to $1 million with the state holding up to 30% of a new home, through Unity Bank; South East Queensland places in round two were exhausted at 30 September 2026 | The same |
Help to Buy sets out the eligibility in full.
What the backyard home costs the parents
The home and the install, which installed versus ex factory prices, and nothing in tax while a child pays board. The costs are not deductible either, because there is no income against them. When the child moves on, the same home becomes a rental, a parent's home or an office, and the tax rules of that use take over from that day. A home built as a Class 1a dwelling keeps all of those options; a studio does not. Class 1a or 10a.
This site's view
The backyard home is the deposit-saving step that the schemes above assume has already happened. Two years in a second home at board instead of rent in the same suburb is a deposit, and the parents keep an asset that works for the next person. For a family with a block and a child who is not leaving the city, it is the shortest path from renting to owning that exists, and nobody has to move.
See it for your block
Questions people ask next
Can my adult child live in a granny flat in Queensland?
Yes. Since 26 September 2022 a secondary dwelling may be occupied by anyone, in every council area, with no family condition on the approval. A child paying board is a domestic arrangement with no tax for the parents.
Can my child use Help to Buy to buy the granny flat?
No. Help to Buy and the other first home schemes fund the purchase of a home the buyer will own and live in. A secondary dwelling is part of the parents' lot and title. The schemes apply to the next home, and the backyard home is where the deposit is saved.
Does a child paying board affect the parents' tax?
No. The ATO treats a relative's payment toward household costs as a domestic arrangement: not income, no deductions, and the main residence exemption from capital gains tax is kept. Market rent changes that.
- Queensland Government, secondary dwellings (occupied by anyone since 26 September 2022), read 16 October 2026
- ATO, rental properties guide (payments from relatives as domestic arrangements), read October 2026
- Australian Government, first home buyer programs (First Home Super Saver Scheme, 5% Deposit Scheme, Help to Buy), read 16 October 2026
- Australian Government, Help to Buy scheme (eligibility), read 16 October 2026
- Queensland Treasury, Boost to Buy, read 16 October 2026
- RTA, median rents quick finder, read October 2026