Hi @Steve1231
You're right about the value of the property for CGT.
If you don't deal with the seller at arm's length, you need to use the market value substitution rule.
This means that instead of the actual cost ($5) as your first element, you use the market value ($550k).
Stamp duty is a state-imposed tax, so you'll need to check with your state government for that bit.
You can read about the market value substitution rule on our website.
All replies
Hi @Steve1231
You're right about the value of the property for CGT.
If you don't deal with the seller at arm's length, you need to use the market value substitution rule.
This means that instead of the actual cost ($5) as your first element, you use the market value ($550k).
Stamp duty is a state-imposed tax, so you'll need to check with your state government for that bit.
You can read about the market value substitution rule on our website.
Featured articles
21 May 2026 · 4 min read time
15 Apr 2026 · 8 min read time