Purchase Option — How an Option to Purchase Works

Updated 12 Mar 2026Content was accurate at the time of publication

A purchase option (also called an option to purchase or property option) is a contractual right granted by a vendor to a prospective purchaser. The buyer pays consideration (an option fee) for the right to elect to buy the property during the option period. If the buyer exercises the option, the parties proceed to settlement under the terms agreed in the option agreement or a linked contract of sale.

What is a purchase option?

A purchase option gives a buyer the right—but not the obligation—to buy land or premises at an agreed price (or by a set valuation method) within a specified period.

Common forms include:

Lease with option to buy: a tenant pays an option fee or higher rent for the right to purchase during or at the end of the lease term.
Standalone option agreement: a separate instrument granting a time-limited right to buy land at a set price or calculated price formula.
Call-like vs put-like arrangements: most property options operate like a call (buyer choice); put-like arrangements (vendor obligation to sell) are rare in ordinary property deals.

Practical examples: A developer pays $10,000 (AUD) for a two-year option to buy a vacant lot for $1,000,000. A tenant in a retail lease has a five-year lease with a two-year option window to buy the premises at a pre-agreed formula.

How does an option to purchase work?

An option to purchase typically progresses through four stages: grant, option period, exercise, and settlement.

Grant. Parties enter an option agreement. The vendor grants the right and the buyer pays an option fee to secure exclusivity. The agreement states the option period and the method to calculate the purchase price (fixed price, indexed or valuation formula). Execution form (contract or deed) depends on jurisdictional execution rules and whether parties intend to create an equitable interest in land. Check the relevant Conveyancing Act for execution requirements.

Option period. The buyer holds the right for the specified window. The vendor usually agrees not to sell the property to anyone else during that period, or to first offer to the option-holder. The option may include conditions precedent (planning approvals, finance, environmental clearance). These conditions are commonly for the buyer's benefit.

Exercise. The buyer exercises by giving the vendor an exercise notice in the agreed form and within the option period. Once validly exercised, the vendor is obliged to sell and the buyer to buy in accordance with the option terms. The option may convert into a contract of sale or require execution of a separate contract of sale.

Settlement. Settlement occurs on the agreed settlement date following exercise. Monies (deposit and balance) are paid, and transfer documents are lodged for registration.

Who pays what and when. Option fee is payable on grant (often non-refundable unless the agreement states otherwise). Sometimes the option fee is credited against a deposit on exercise. Vendor outlays (rates, insurance) usually remain vendor's responsibility until settlement unless parties agree otherwise. Buyers should confirm financing options early and discuss lender requirements with their broker or lender. See business loan products for options.

Execution and registration. Options that create an equitable interest are commonly executed as a deed; proper witnessing and execution form may be required by state law. Registration or noting of an option on title depends on the jurisdiction and the relevant land registry rules — consult your conveyancer.

Types of option arrangements

Options come in several shapes depending on commercial goals:

Option to purchase land (standalone): grants the right to buy the title within a time window.
Lease with option to buy: tenant has the right to purchase; the option fee may be part of rent.
Conditional option: exercise is conditional on planning approvals, finance, environmental clearance or rezoning.
Nominee/assignment-enabled option: allows the option-holder to nominate or assign their right to a third party (often subject to vendor consent).
Exclusive negotiation option: short-term lockout to negotiate sale terms before a full option is granted.

Key terms to include in an option agreement

Include precise timeframes and defined notice methods. Below are essential clauses and drafting notes.

Option fee and consideration. State amount, timing, whether refundable and whether credited to purchase price on exercise. Sample wording: "Option fee $10,000 payable on execution. Option fee non-refundable but credited against the deposit on exercise."

Exercise mechanics. Define the exact exercise window (dates and times). Specify the form and delivery method of the exercise notice (e.g., written notice delivered by registered post or email with read receipt). State consequences for late, unclear or conditional notices.

Assignment and nomination. Define assignability or nomination rights and any vendor consent process (including time for response and whether consent can be unreasonably withheld). Consider guarantees or undertakings from assignees.

Inclusions and exclusions. List fixtures, chattels, easements and encumbrances that transfer with title or are excluded. Clarify who pays for statutory searches and who bears liabilities discovered after exercise.

Purchase price and valuation mechanism. Specify fixed price or formula (e.g., market valuation at exercise date less adjustments). If valuation-based, nominate an independent valuer, timetable and dispute resolution for differing valuations.

Settlement date and adjustments. State settlement period after exercise (e.g., 42 days), escrow arrangements, deposit amount and whether the option fee counts toward deposit. Define adjustments for rates, taxes and utilities.

Conditions precedent and warranties. Include planning, finance, environmental reports and title warranties (or state that purchaser accepts title subject to disclosed encumbrances). Define consequences if conditions are not satisfied (option lapses or purchase proceeds with rescission rights).

GST and tax treatment. Allocate GST liability clearly (specify whether the price is GST-inclusive or exclusive). Link to relevant guidance: GST and the ATO: https://www.ato.gov.au/.

Notices and service. Define acceptable service methods, addresses for service and deemed receipt moments.

Default and remedies. Clarify remedies for breach (forfeiture of option fee, specific performance, damages). Specify whether vendor may seek injunctive relief to prevent double dealing.

Dispute resolution. Include mediation and arbitration steps before litigation.

Indicative clause samples (indicative only — seek legal advice): Option fee clause: "The Optionee shall pay the Option Fee of $10,000 within 5 Business Days of execution. The Option Fee is non-refundable except where the Vendor materially breaches this Agreement." Exercise clause: "To exercise the Option, the Optionee must deliver a written Exercise Notice to the Vendor by 5:00pm on the Option Expiry Date."

Transfer duty and other fiscal implications

Transfer duty for options can be complex. Revenue NSW provides specific guidance on when transfer duty may be payable in relation to options: https://www.revenue.nsw.gov.au/taxes-duties-levies-royalties/transfer-duty/options

When is duty assessed? Duty may arise at grant of the option, on exercise, or on transfer. Revenue authorities look at substance over form — whether the option is effectively a sale.

Factors that trigger duty at grant: a short option period, a substantive option fee credited to price, or terms that operate as a sale may prompt duty at grant.

If duty is deferred to exercise: the duty payable is generally calculated on the purchase price at exercise.

Worked example: a large option fee for a near-immediate purchase is more likely to attract duty on grant than a modest non-refundable fee for a long option period.

GST considerations. Residential sales are sometimes GST-free in certain circumstances; commercial property sales are often taxable or input-taxed. Seek ATO guidance: https://www.ato.gov.au/. Include a clear GST clause allocating liability and specify whether the purchase price is GST inclusive.

Other taxes to consider: Capital gains tax for vendors (seek tax advisor). Duties and fees related to mortgage registration or notes on title.

Due diligence checklist before you grant or exercise an option

Buyers and vendors should run targeted checks at both grant and exercise stages.

For buyers (before grant):

Title search and certificate of title.
Check encumbrances, mortgages, covenants and easements.
Zoning, planning restrictions and development controls.
Outstanding notices, orders, or compliance issues.
Environmental and contamination reports.
Infrastructure and services accessibility.
Market valuation and appraisal.
Finance pre-approval or conditional finance clause (consider lender timetables, valuation and documentation).

For buyers (before exercise):

Updated title search and discharge figures for encumbrances.
Satisfy conditions precedent: planning approvals, building approvals, surveying and site reports.
Confirm GST and duty treatment with a tax adviser.
Confirm settlement funds and lender requirements.

For sellers:

Ensure title is clear for transfer; obtain discharge figures for mortgages.
Consider vendor warranties and disclosure obligations.
Decide whether to permit assignment or nomination and set consent and guarantor requirements.
Plan timing of sale and any development commitments.

Example timeline: from grant to exercise and settlement

A concise 6-month example for a standalone option:

Day 0: Option agreement signed; option fee $10,000 paid; option period 6 months begins.
Day 0–30: Buyer completes preliminary due diligence (title search, zoning review).
Day 30–90: Buyer commissions environmental and structural reports; seeks preliminary planning advice.
Day 90–150: Buyer secures conditional finance approval; resolves due diligence queries.
Day 150: Buyer serves Exercise Notice within option period (valid exercise).
Day 150–192 (42 days): Contract of sale (or conversion) leads to settlement preparation; vendor provides settlement statement; buyer arranges lender requirements.
Day 192: Settlement; transfer lodged; title registered to buyer.

Timelines vary—negotiate timeframes for finance, valuations and council approvals.

Assignment, nomination and transfer of options

Assignment and nomination provisions determine whether and how an option can be transferred.

Assignment is an outright transfer of the option (often requires vendor consent). An assignment typically requires an assignment deed and may involve a guarantor from the assignee.

Nomination is when the option-holder nominates a party to complete the purchase upon exercise (less transfer of the option itself). Vendor consent clauses commonly apply.

Common restrictions include vendor consent, restrictions on assignee type, or requirements for assignee's financial standing.

Practical issues include transferee due diligence, GST and duty re-assessment, whether the option fee is refundable on assignment, and anti-avoidance wording to prevent immediate "flip" transactions.

Benefits and risks for each party

Buyer benefits: Flexibility; time to obtain finance and approvals; exclusivity.

Buyer risks: Loss of option fee; change in market value; duty/GST surprises; limited remedies if vendor breaches.

Vendor benefits: Immediate consideration (option fee); certainty of a potential sale; time to secure buyer.

Vendor risks: Property tied up; risk of undervalued sale if price fixed; duty on grant if structured as sale.

Common pitfalls: Option fee too low relative to sale price (risk vendor) or too high (risk buyer). Vague exercise mechanics causing disputes. Failure to address duty/GST exposure at grant and exercise stages.

Practical drafting and negotiation tips

Fix precise exercise mechanics and include a sample Exercise Notice schedule.
Negotiate whether the option fee is refundable, non-refundable or credited to deposit.
Limit vendor obligations to refrain from selling, with clear remedies for breach (option fee return plus damages or injunctive relief).
Use valuation formulas with clear dispute resolution (e.g., appoint an independent valuer within 10 business days).
For nominee/assignment rights, limit vendor consent to be not unreasonably withheld and define financial thresholds for an acceptable assignee.
Draft GST clause: "Purchase Price is exclusive of GST. If GST applies, the purchaser must pay the GST in addition to the Purchase Price."
Include a simple provision dealing with personal property security registration if chattels or plant are involved, but avoid unnecessary technical detail in consumer-facing drafts.

Sample negotiation point: Buyer seeks a 180-day option with a robust due-diligence window; seller seeks a higher non-refundable fee and a shorter option period to limit holding costs.

When to consult a solicitor or conveyancer

Seek professional advice if any of the following apply:

Complex title, multiple interests, or existing encumbrances.
Large sums or commercial developments.
Assignment, nominee use or layered financing is anticipated.
Potential transfer duty or GST exposure is uncertain.
You require enforceable deed execution or bespoke remedies.

Ask your solicitor or conveyancer to:

Draft an option with clear exercise and notice mechanics.
Advise on transfer duty, stampings and registration requirements.
Prepare or review Exercise Notices and settlement documentation.
Provide a conveyancing checklist to guide you through due diligence.

FAQ

What is the difference between an option and a contract of sale?

An option is a right to buy (no obligation) for a period; a contract of sale creates mutual obligations to transfer and pay. If an option is exercised, a contract of sale is formed or the option operates as the contract.

Is an option binding on third parties?

Typically binding between parties only. If it creates an equitable interest and is registrable (where registration applies), third parties may be affected — seek conveyancer advice.

Does an option have to be a deed?

Not always, but deeds are commonly used where parties want a more robust equitable interest or longer enforceability. Check the relevant Conveyancing Act execution rules: https://legislation.nsw.gov.au/.

Can a vendor sell to someone else during the option period?

Only if the option allows it. Standard option agreements include exclusivity clauses preventing sale to others; specify breach remedies.

What happens to the option fee if I don't exercise?

Usually the option fee is forfeited to the vendor unless the agreement states otherwise. Negotiate this point.

Are options subject to transfer duty at grant?

Possibly — transfer duty depends on the substance of the arrangement. Revenue guidance: https://www.revenue.nsw.gov.au/taxes-duties-levies-royalties/transfer-duty/options.

Can I assign my option?

Only if the option agreement permits assignment or nomination; vendor consent clauses are common. Consider assignment tax and duty consequences.

Do options need registration?

Registration depends on jurisdiction and whether the option creates an interest in land registrable by the state land registry. Check NSW LRS: https://www.nswlrs.com.au/.

Will GST apply on exercise?

GST treatment depends on the property type and the nature of the sale. Consult the ATO or a tax adviser.

Is sample clause wording legally sufficient?

Sample clauses here are indicative only — seek legal drafting from a qualified solicitor.

Key takeaways

A purchase option gives buyers flexibility and time to secure finance and planning approvals before committing to purchase, while vendors receive upfront consideration and certainty of a potential sale. Key protections include clear exercise mechanics, explicit terms on transfer duty timing, and robust due diligence checklists. Always consult a solicitor or conveyancer for complex transactions, especially where large sums, assignment rights, or unclear tax treatment are involved.