Option to Purchase (OTP) Singapore
The Legal Document That Locks In Your Property Deal
Category: PROPERTY · Last updated: September 2026
An Option to Purchase (OTP) is a legal document a property seller grants a buyer in Singapore, giving the buyer the exclusive right to buy the property at an agreed price within a fixed period. It is signed after paying an option fee, and it binds the seller but not yet the buyer.
Not financial advice. All figures for educational reference only. Data as at September 2026.
Key Takeaways
- An OTP gives a buyer the exclusive right, but not the obligation, to purchase a property at a fixed price within a set window.
- For private resale property, the option fee is typically 1% of the purchase price and the option period usually runs 14 days.
- Exercising the OTP means paying a further 4% (the exercise fee), bringing the total deposit to 5% before the balance is financed.
- HDB resale flats use a different structure — combined option and exercise fees are capped at S$5,000 with a 21-day exercise window.
- If a buyer lets the OTP lapse without exercising it, the option fee is forfeited to the seller; there is no obligation to proceed.
What Is Option to Purchase?
An Option to Purchase, commonly shortened to OTP, is the document that formally starts a property transaction in Singapore. Once a seller signs and hands over the OTP, they cannot sell the property to anyone else during the option period — the buyer effectively ‘locks up’ the right to purchase at the agreed price. This is different from a verbal agreement or a deposit cheque without a signed OTP, which carries no legal force under Singapore property law.
The OTP exists because property transactions in Singapore typically involve a gap between agreeing on a price and completing the legal conveyancing process, which can take weeks for a resale flat or months for a private property with financing to arrange. Without an OTP, either party could walk away or the seller could accept a higher offer from someone else while the buyer is still arranging a home loan or waiting on a valuation. The OTP protects the buyer’s position during this window in exchange for a non-refundable option fee paid to the seller.
Crucially, the OTP is a one-sided commitment at the point of signing: the seller is bound to sell if the buyer chooses to exercise, but the buyer is free to walk away and forfeit only the option fee. This asymmetry is what buyers are paying for when they hand over the option fee — the certainty that the property will not be sold to someone else while they finalise financing, do due diligence, or arrange other logistics.
How Does It Work in Singapore?
For private property (resale condos, landed homes), the process typically unfolds in three steps. First, the buyer and seller agree on a price and the buyer pays an option fee, usually 1% of the purchase price, in exchange for a signed OTP. Second, within the option period (commonly 14 days, though negotiable), the buyer decides whether to proceed. If they do, they ‘exercise’ the OTP by signing and returning it along with the exercise fee, typically 4% of the purchase price, bringing the total deposit paid to 5%. Third, once exercised, the OTP becomes a binding Sale and Purchase Agreement, and both parties are legally committed to completing the transaction, usually within 8 to 12 weeks.
HDB resale flats follow a more standardised, HDB-prescribed process. The buyer and seller use HDB’s own OTP format via the HDB Resale Portal, and the combined option fee plus deposit is capped by regulation at S$1 to S$1,000 for the option fee itself, with the total option fee and deposit not exceeding S$5,000. The exercise period for HDB resale OTPs is fixed at 21 days from the date of grant, longer than the private market’s typical 14 days, giving buyers extra time to secure an HDB loan eligibility letter or bank in-principle approval before committing.
In both markets, once the OTP is exercised, the buyer is legally bound to complete the purchase and financing must be finalised quickly. Buyers who exercise an OTP without loan approval already in hand risk being contractually obligated to a purchase they cannot finance, which can result in losing their full deposit and being sued for breach of contract in serious cases.
Example
Consider a buyer, Wei Ling, who wants to purchase a resale condo unit in Singapore priced at S$1,200,000. The seller agrees and grants her an OTP after she pays a 1% option fee of S$12,000. Wei Ling now has 14 days to decide. During this window she secures an in-principle mortgage approval from her bank. On day 10, she exercises the OTP by paying the 4% exercise fee of S$48,000, bringing her total deposit to S$60,000 (5%). The OTP is now a binding contract; both Wei Ling and the seller must complete the sale, typically within 10 to 12 weeks, when the remaining 95% (minus her loan quantum) is paid at completion, alongside Buyer’s Stamp Duty and any Additional Buyer’s Stamp Duty that applies to her.
Advantages
- Price certainty during due diligence. The OTP locks in the purchase price while you complete inspections, valuations, and loan approval, so the seller cannot raise the price or sell to another buyer mid-process.
- Low upfront commitment for private property. Paying just 1% to secure the option gives buyers time to firm up financing before committing the larger 4% exercise fee.
- Clear, HDB-regulated process for resale flats. The HDB Resale Portal standardises the OTP format, fee caps, and 21-day exercise window, reducing disputes over ambiguous terms.
- Walk-away flexibility before exercising. If financing falls through or a buyer changes their mind, they can let the OTP lapse and lose only the option fee, not the full purchase commitment.
- Protects sellers from serial time-wasters. Because the option fee is forfeited if the buyer does not proceed, sellers are compensated for taking the property off the market during the option period.
Risks and Limitations
- Forfeiting the option fee is a real cost. If a buyer cannot secure financing or changes their mind after paying the option fee, that money (1% of a $1.2m property is $12,000) is gone.
- Exercising without loan approval is risky. Once exercised, the OTP is legally binding; buyers who have not confirmed their mortgage may be forced to complete the purchase or face legal action and forfeiture of the 5% deposit.
- Short exercise windows create time pressure. 14 days for private property is not always enough time to complete a full valuation and loan approval, especially during busy banking periods.
- Additional Buyer’s Stamp Duty (ABSD) timing matters. ABSD and Buyer’s Stamp Duty (BSD) are calculated based on the OTP date, not the completion date, so buyers must budget for these costs from day one.
- Sellers can still receive higher offers after the fact. If a seller regrets accepting a lower offer, they cannot back out once the OTP is signed and later exercised, but disputes over OTP validity do occasionally arise and can be costly to resolve legally.
Option to Purchase vs Letter of Intent (LOI)
| Feature | Option to Purchase (OTP) | Letter of Intent (LOI) |
|---|---|---|
| Legal force | Legally binding once signed and paid for | Generally not legally binding; expresses intent only |
| Typical fee | 1% of price (private) / capped S$1,000 (HDB) | Sometimes a small good-faith deposit, refundable |
| Used for | Actual property purchase transactions | Commercial leasing or early-stage negotiations |
| Exercise window | 14 days (private) / 21 days (HDB) | No fixed statutory window |
| Consequence of walking away | Forfeit the option fee | Usually no financial consequence |
Source: TKN research, compiled September 2026.
The Bottom Line
For Singapore property buyers, the Option to Purchase is the document that turns a verbal agreement into an enforceable right to buy at a fixed price. Understanding the fee structure, exercise window, and the binding nature of exercising the OTP is essential before signing, since the option fee is real money at stake the moment ink meets paper.