Property Option Agreements in Australia: How to Lock In a Price Before Finance Clears (2026)

What a property option agreement actually does

The agreement grants one party—the option holder—the right to elect to buy a property on agreed terms. Until that election is made (or the option lapses), the vendor cannot sell to anyone else. The option fee, paid upfront, is the consideration that makes the agreement binding. It is separate from the deposit on the eventual contract of sale.

Three core variables define every option:

• The option fee — typically 0.25% to 1% of the purchase price, though there is no statutory cap in most states
• The option period — the window in which the holder can exercise the option, commonly 14 to 90 days
• The exercise price — the agreed purchase price, which can be fixed at signing or set by a formula (e.g., valuation plus a margin)

Once exercised, the option converts into a binding contract. If the holder lets it lapse, the vendor keeps the option fee.

Call options, put options, and put-and-call deeds

The terminology trips up a lot of buyers. Understanding the distinction matters because the document you need—and the stamp duty consequences—differ between them.

Call option: The buyer holds the right to compel the sale. The vendor is locked in; the buyer can walk away by not exercising. Developers often use call options to accumulate sites without triggering stamp duty on each parcel.

Put option: The vendor holds the right to compel the buyer to purchase. Less common in residential conveyancing, but used in off-the-plan developments to give the developer certainty that buyers will not simply disappear.

Put-and-call deed: Both rights sit in the same document. The buyer has a call option; the developer has a put option. This structure became extremely common in New South Wales off-the-plan transactions because it allowed the option to be assigned to a subsequent buyer before completion—effectively on-selling a right to purchase without triggering a second full round of transfer duty. The Duties Act 1997 (NSW) now taxes these assignments directly, so the arbitrage has largely closed, but the structure itself remains in wide use for legitimate reasons (bridging between exchange and settlement, managing deposit liability, managing GST timing).

In Victoria, the equivalent mechanism is a put-and-call structure governed by the Sale of Land Act 1962 (Vic). Queensland practitioners use similar deeds under the Property Law Act 1974 (Qld).

Stamp duty on the option fee—and on exercise

This is where many buyers get a nasty surprise. In most Australian states, stamp duty applies at two points:

1. On the option fee itself when the option is granted
2. On the full purchase price when the option is exercised and the contract of sale is executed

New South Wales levies transfer duty on the grant of a call option under the Duties Act 1997 (NSW). The rate applied to the option fee is the same ad valorem rate that applies to a dutiable transaction of that value—not a flat fee. When the option is later exercised, duty is assessed again on the full purchase price. Importantly, under Revenue NSW's confirmed position, the duty paid on the original grant of the call option fee is not credited against the duty payable on exercise — both amounts are payable separately. A credit under section 64D of the Duties Act 1997 (NSW) is available only where duty was paid on a subsequent transfer or assignment of the option itself, not on the original grant.

Victoria similarly imposes duty on the option fee under the Duties Act 2000 (Vic). Buyers should confirm with the State Revenue Office whether a credit-on-exercise mechanism applies to their specific transaction structure, as the rules differ from NSW.

Queensland and Western Australia treat the grant of an option as a dutiable transaction. South Australian and Tasmanian stamp duty treatment is broadly similar, though thresholds and concessional rates differ.

Practical implication: Buyers who intend to assign their option to a third party face duty on the assignment as a separate transaction. Do not assume an assignment is duty-free simply because it is structured as a transfer of contractual rights rather than land.

The 66W cooling-off certificate in New South Wales

In New South Wales, a residential buyer who signs a contract of sale has a five-business-day cooling-off right under section 66S of the Conveyancing Act 1919 (NSW). The buyer can rescind during that period, forfeiting 0.25% of the purchase price.

When a put-and-call option is exercised and converts into a contract of sale, that cooling-off right exists unless it is waived. Waiver is achieved by the buyer's solicitor signing a certificate under section 66W of the Conveyancing Act 1919 (NSW), commonly called a "66W certificate." By signing it, the solicitor certifies that they have explained the effect of the waiver to the buyer—namely, that the buyer has no right to rescind and is immediately bound.

Off-the-plan developers in NSW routinely require a 66W certificate on exchange. This is not inherently sinister, but buyers should understand what they are waiving. Once signed, walking away from the contract means the vendor can sue for the full deposit and, in some circumstances, for loss on resale.

If your solicitor is uncomfortable signing a 66W, that discomfort is worth understanding before you proceed. The certificate exposes the solicitor to liability if the advice was not properly given.

Finance conditions and option periods: getting the timing right

Misjudging the option period relative to bank approval timelines is one of the most common structural mistakes. A 21-day option sounds generous. A lender reviewing unusual security—rural land, off-the-plan apartment, heritage-listed terrace—can take longer than that to issue formal approval.

Exercising the option before finance is confirmed means you are bound to complete. Unlike a standard contract of sale with a finance condition under clause 3 of the REIQ contract (Queensland) or the standard REINSW contract (NSW), an option agreement does not automatically carry a finance escape clause. That protection must be expressly drafted in, with a clear notification deadline. Miss the date, and you may be deemed to have exercised—or lapsed—the option, depending on how the clause is worded.

Using an option to purchase property agreement

A well-drafted option agreement sets out the exercise price, the option period, the option fee (and whether it is refundable on certain events), the exercise mechanism, any conditions, and the terms of the contract of sale that will be executed on exercise. Attaching a draft contract as a schedule eliminates ambiguity about what you are actually committing to buy.

The option to purchase property agreement for Australia at forms-legal.com covers the core provisions required under Australian property law. A solicitor should review the draft before execution, particularly for off-the-plan transactions and multi-site acquisitions where stamp duty planning is a factor.

When vendors use options and what to watch for

Vendors grant options when they need a committed buyer while finalising subdivision approvals, or when the buyer needs longer than a standard settlement allows. Three things trip vendors up:

• Option fees set too low make walking away cheap. A 0.1% fee on a $1.2 million property is $1,200—a small price for three months of exclusivity.
• Ambiguous exercise mechanisms produce disputes. "Exercise by written notice" must specify the delivery method, the recipient, and what constitutes receipt.
• Assignment without consent can bind a vendor to an unknown third party. An express prohibition or prior-written-consent clause prevents this.

Key compliance points across states

NSW: Transfer duty on grant under Duties Act 1997 (NSW); 66W waiver required if cooling-off is waived on exercise; Foreign Investment Review Board approval required if the option holder is a foreign person.

Victoria: Duty on grant under Duties Act 2000 (Vic); Sale of Land Act 1962 (Vic) governs off-the-plan contracts; first home buyer concessions do not extend to the option fee phase.

Queensland: Duty under Duties Act 2001 (Qld); REIQ Put and Call Option Deed widely used; body corporate disclosure obligations apply at exercise for strata units.

Western Australia: Duties Act 2008 (WA) applies; no statutory cooling-off right for commercial buyers.

Across all states, the ATO treats a retained option fee as ordinary income (vendor in the property business) or a capital gain (private vendor) in the year of lapse. Capital gains tax implications on the option itself are separate from CGT on any eventual sale.

What to check before signing

Before executing an option agreement in Australia, verify:

1. The option period is long enough to accommodate your finance timeline, with at least a one-week buffer
2. The exercise mechanism is unambiguous—written notice by email or by hand delivery to a nominated address
3. Stamp duty on the option fee is budgeted for, not assumed to be deferred until settlement
4. The attached draft contract reflects the terms you actually agreed (price, inclusions, settlement date)
5. Any conditions (finance, due diligence, subdivision approval) have clear trigger and notification dates
6. For NSW off-the-plan: you understand whether you are being asked to sign a 66W and what that means

Property option agreements are not interchangeable with standard contracts of sale. The structural flexibility they offer comes with corresponding complexity—particularly around stamp duty, cooling-off rights, and assignment. Getting the document right from the start saves substantial cost and argument later.