What Is DeFi? A Beginner's Guide for Australians
DeFi — short for decentralised finance — is a catch-all term for financial services that run on a blockchain instead of through banks or brokers. Lending, borrowing, trading and earning yield all happen through smart contracts: self-executing code that anyone can use, usually without signing up, handing over ID, or asking permission. It’s one of the most powerful and one of the most dangerous corners of crypto.
What you can do in DeFi
The main building blocks are surprisingly familiar:
Decentralised exchanges (DEXs) like Uniswap let you swap one token for another directly from your wallet, with no company holding your funds. Lending protocols let you deposit crypto to earn interest, or borrow against crypto you post as collateral. Liquidity provision and yield farming let you supply tokens to a pool and earn a share of the fees. Most of this runs on Ethereum and similar networks, and every action costs a gas fee.
Why people are drawn to it
DeFi is open to anyone with a wallet, runs 24/7, and can offer yields not available from a bank. Because there’s no middleman, it can be faster and cheaper for some tasks — and it’s transparent, since the code and transactions are public. For its supporters, it’s a preview of finance rebuilt without gatekeepers.
The risks are real
DeFi is not a bank, and the higher returns come with serious risks. Smart-contract bugs can be exploited to drain funds. Scams and “rug pulls” — where developers abandon a project and run off with the money — are common. Yields advertised as huge are often unsustainable or a lure. There’s no customer support, no reversals, and no deposit guarantee: a mistake or a hack usually means the money is simply gone. And because you interact directly from your wallet, a single approval to a malicious contract can empty it — see our scam-avoidance guide.
Start cautiously
If you explore DeFi, start with tiny amounts on well-established protocols, use a separate wallet from your main holdings, and never approve a transaction you don’t understand. Most Australians are better off getting comfortable with the basics first — buying, securing and self-custody — before venturing in.
Tax note
The ATO generally treats DeFi activity as taxable. Swapping tokens on a DEX is a CGT event, and rewards or interest earned are usually ordinary income at the time you receive them. DeFi record-keeping is notoriously fiddly, so crypto tax software and a tax professional are worth it. See our crypto tax guide.
This is general information only, not financial advice. DeFi is experimental and high-risk — never commit more than you can afford to lose.
General information only — not financial or tax advice. Verified 2026-08-13; details can change.