You've done the research, set your budget, and you're ready to bid. But there's one critical detail that catches many buyers off guard: the deposit. Unlike a private sale where you have days to sort your finances, an auction demands cash — or at least a bank cheque — on the spot.

So how much do you actually need? The short answer is 10% of the purchase price, payable on auction day. But the full picture is more nuanced, and understanding it could save you from a very expensive mistake.

The Standard 10% Rule

Across all Australian states, the standard auction deposit is 10% of the purchase price. This is payable immediately after you sign the contract of sale — which happens right there at the auction, usually within 30 minutes of the hammer falling.

For a $1,000,000 property, that means $100,000 ready to go on the day.

This deposit is non-refundable. Unlike private treaty sales, auction purchases in most states have no cooling-off period. Once the hammer drops and you sign, you're committed. If you can't pay the deposit, the vendor can sue you for breach of contract and claim damages.

Can You Negotiate a Lower Deposit?

Yes — but you need to do it before the auction, not after.

Many vendors and their agents will agree to a reduced deposit if you ask in advance. Common arrangements include:

5% on the day, 5% within 5 business days — the most common variation
A fixed amount (e.g., $50,000 regardless of purchase price) — sometimes accepted for higher-value properties
Bank guarantee — your bank provides a guarantee letter instead of cash, though this is less common at residential auctions

To negotiate, contact the selling agent at least a week before the auction. Get any agreed variation in writing and confirmed in the contract terms. Verbal agreements won't protect you.

Keep in mind: vendors are under no obligation to accept a lower deposit. If the property is in high demand, they're unlikely to budge from 10%.

What Forms of Payment Are Accepted?

This varies by state and by the selling agent, but typically:

Payment Method	Commonly Accepted?	Notes
Personal cheque	Yes (most common)	Usually held until cleared
Bank cheque	Yes	Preferred by many agents
Electronic transfer	Sometimes	Agent must provide details in advance
Cash	Rarely	Some agents refuse due to anti-money-laundering rules
Credit card	Rarely	Usually capped at a small amount due to merchant fees
Deposit bond	Sometimes	Must be arranged before auction day

The safest approach: bring a bank cheque made out to the agent's trust account for 10% of your maximum bid. If you win for less, the agent can refund the difference. If you're unsure of the exact amount, some buyers bring multiple smaller bank cheques that add up to their maximum.

Deposit Bonds: An Alternative When Cash Is Tight

A deposit bond is a guarantee from an insurance company that you'll pay the deposit at settlement. It means you don't need to hand over actual cash on auction day.

How it works:

You arrange the bond before auction day (costs 1-2% of the deposit amount)
On auction day, you present the bond certificate instead of a cheque
The full deposit (plus the bond cost) is paid at settlement

When it makes sense:

Your cash is tied up in an existing property you're selling
Your savings are in a term deposit with break penalties
You're using equity from another property

Important caveat: not all vendors accept deposit bonds. Check with the selling agent beforehand. Some contracts specifically exclude them.

The Deposit vs Your Total Cash Needed

A common first-home-buyer mistake: thinking the deposit is all the cash you need. It's not even close.

Beyond the 10% deposit, you'll also need cash for:

Stamp duty — the biggest additional cost, ranging from $15,000 to $70,000+ depending on your state and purchase price. Use our stamp duty calculator to get an exact figure.
Legal/conveyancing fees — typically $2,000-$4,000
Building and pest inspection — $500-$1,000 (ideally done before auction)
Loan application fees — $0-$600 depending on your lender
Moving costs, connections, insurance — another $2,000-$5,000

For a $1,200,000 property in NSW, your total cash requirement looks roughly like this:

Cost	Amount
Deposit (10%)	$120,000
Stamp duty (NSW)	~$48,500
Legal fees	~$3,000
Inspections	~$1,000
Other costs	~$3,000
Total cash needed	~$175,500

That's significantly more than the $120,000 deposit alone. Make sure your budget accounts for everything — not just the deposit and not just the purchase price. Our first home buyer guide covers this in more detail.

What Happens to Your Deposit After Auction?

Once paid, your deposit is held in the agent's trust account until settlement (typically 6 weeks after auction day, though 30-90 days is possible depending on the contract).

At settlement:

The deposit is released to the vendor
Your lender pays the remaining balance
You receive the keys

If settlement is delayed due to loan issues on your end, you risk forfeiting the deposit and facing legal action. This is why having unconditional finance approval (not just pre-approval) is so important before bidding.

State-by-State Deposit Differences

While 10% is standard nationally, some state-specific rules apply:

For a comprehensive look at deposit rules and obligations across all states, see our auction deposit rules guide.

NSW

10% standard, but 0.25% minimum if negotiated
No cooling-off period for auction purchases
Deposit held in agent's trust account

Victoria

10% standard
No cooling-off for auctions
Section 32 (vendor's statement) must be provided before auction
Deposit can be paid to the estate agent or a legal practitioner

Queensland

10% standard, often negotiable to 5%
No cooling-off for auctions
If the property is sold within 3 days after being passed in, cooling-off may still not apply

Other States

SA, WA, TAS, NT, ACT all follow the 10% standard with minor procedural variations
Check with your conveyancer for state-specific requirements

How to Prepare Your Deposit Before Auction Day

A clear checklist for the week before:

Confirm the deposit amount — call the agent and ask what's required and what payment methods they accept
Arrange your bank cheque — visit your bank 2-3 days before. Make it payable to the trust account name the agent provides
Have backup payment — bring your chequebook as backup, or confirm the agent's EFT details
Check your pre-approval — confirm it's still valid and covers your maximum bid amount
Brief your conveyancer — they should review the contract of sale before auction day, not after
Set your budget zones — know your comfort, stretch, and absolute limit before you arrive

What If You Can't Pay the Deposit?

This is a scenario you must avoid at all costs. If you win an auction and cannot pay the deposit:

The vendor can terminate the contract
You may be liable for the difference between your price and whatever the property eventually sells for
The vendor can claim legal costs and damages
You lose any deposit money already paid
It can affect your credit history and ability to buy in the future

The consequences are severe enough that you should never bid beyond what you can actually fund. Using a tool like Smart Bid to set firm budget zones before auction day helps prevent emotional overbidding that could leave you unable to settle.

First Home Buyer Considerations

If you're a first home buyer, you may have access to government schemes that affect your deposit requirements:

First Home Owner Grant (FHOG) — a one-off payment (varies by state, typically $10,000-$30,000) that can supplement your deposit savings
First Home Guarantee (formerly FHLDS) — allows you to buy with as little as 5% deposit without paying Lender's Mortgage Insurance (LMI). However, you still need to arrange a 10% deposit for auction day — the 5% figure refers to your loan-to-value ratio, not the auction deposit
Stamp duty concessions — most states offer reduced or zero stamp duty for first home buyers on properties under certain thresholds. Check our stamp duty guide for NSW-specific details

The key distinction: your lender may only require 5-10% of the property value as your loan deposit, but the auction contract will require 10% on the day. These are different obligations. Plan for both.

Key Takeaways

10% of the purchase price is the standard auction deposit across Australia
The deposit is payable immediately — bring a bank cheque to the agent's trust account
You can negotiate a lower deposit before the auction, but get it in writing
Budget for total cash needed (deposit + stamp duty + fees), not just the deposit
No cooling-off period at auction — your purchase is unconditional
Consider a deposit bond if your cash is tied up elsewhere
Never bid more than you can fund — the consequences of defaulting are severe

Planning to bid at auction? Set up your budget zones with Smart Bid to know exactly how much you can afford — including deposit, stamp duty, and all buying costs — before auction day.

How Much Deposit for Auction? The 10% Rule Explained (2026)