Set an auction cash ceiling that includes stamp duty

Price alone is not a walk-away number

Most buyers set a maximum bid as a purchase price. That is incomplete. Settlement needs deposit or equity cash, stamp duty, registration fees, and a buffer for adjustments. An auction win at your “max price” can still leave you underfunded if duty was never in the ceiling.

Cooling-off rules differ by state and often do not apply to auctions. Treat auction cash planning as final. If you cannot settle the stack, your maximum bid is lower than the price you emotionally want.

Write the ceiling the night before — not in the auction room while adrenaline is high.

Build the ceiling in four lines

Line 1: maximum purchase price you will pay. Line 2: deposit cash at your intended LVR path. Line 3: stamp duty and government fees at that price (and at a price $25,000 higher, so a stretch bid does not surprise you). Line 4: buffer for adjustments and lender fees.

Cash required is roughly lines 2 + 3 + 4. Compare to cleared savings. The gap is your problem before you register to bid.

If family help is part of the plan, document whether it is gift or loan and when cleared funds land. Last-week transfers create credit and settlement friction.

Caps, concessions, and stretch bids

First-home and scheme paths often use price caps. Stretching “just a bit more” can move you from a concession path to full duty or from scheme-eligible to private LMI. Re-run DutyStack at the stretch price before you nod to the agent.

In Queensland, also re-check purpose at the stretch price. Purpose and price both move cash.

Keep a full-duty fallback if you are bidding near a $0 or heavily concessional band. Winning over the cap without that fallback is how settlements fail.

Auction day discipline

Bring the written ceiling. If bidding passes it, stop. There will be another property. There will not be another easy way to invent settlement cash after unconditional.

If you win under the ceiling, message your conveyancer immediately and start the funds schedule. Do not celebrate by spending the buffer.

Open the relevant state learn hub the morning of the auction. Re-read the traps. Then open the calculator with your ceiling price one last time.

After you win

Replace DutyStack estimates with the conveyancer’s adjustment statement. If the statement is higher, the statement wins until proven otherwise.

Align broker and conveyancer stories on purpose, first-home status, and foreign purchaser status. Auction urgency is not an excuse for mismatched files.

How this fits DutyStack

Use the calculator for custom numbers after you understand the decision sequence on this page. Use learn hubs for state-specific traps. Use scenarios when you need a forced comparison with engine output.

Nothing here is credit advice under the NCCP or a Revenue Office assessment. Professionals settle the contract; these pages help you decide whether you can afford to start.

We update guides when modelled settings change. Always verify rules for your contract date.

Return to this page when your offer price or household story changes. Static advice from a friend is not a worksheet.

Checklist before you act

Print or save this list and tick it with real names and dates:

• Real offer or ceiling price written down
• Purpose and first-home status agreed for every purchaser
• Foreign purchaser status checked for every purchaser
• Duty and fees modelled at that price
• Grant treated as zero until confirmed
• Conveyancer engaged before auction where required