An Option to Purchase (OTP) is a legal contract granting a buyer the exclusive right to acquire a property within a set period. A small option fee reserves the property; a larger exercise fee commits the purchase. HDB and private resale OTPs follow different prescribed forms, timelines, and fee caps (as of 2026-06).
You have found the flat or condo you want — but the seller has three other interested parties. How do you lock them out while you arrange your financing? The answer is the OTP. Paying the option fee halts the seller from entertaining other buyers during the Option Period; exercising it seals the deal. Understanding exactly how much money moves, when, and what you forfeit if plans change is one of the most practical skills any Singapore property buyer can develop.
What an OTP Is
An Option to Purchase is a unilateral contract: the seller grants the buyer an exclusive right — but not an obligation — to buy the property at an agreed price within the Option Period. The buyer pays an option fee to receive this right. If the buyer then pays a second, larger exercise fee within the Option Period and signs the OTP, the property is legally committed to that buyer. The seller cannot withdraw once the OTP is granted; doing so exposes them to legal action for breach of contract.
Why the OTP Matters
The OTP sits at the hinge point between agreement and conveyancing. It gives both parties breathing room — the buyer can secure a bank valuation, confirm financing, and instruct a solicitor; the seller knows the property is effectively sold. Stamp duty obligations are also triggered at this stage: Buyer's Stamp Duty (BSD) and, where applicable, Additional Buyer's Stamp Duty (ABSD) must be paid within 14 days of exercising the OTP or 14 days of the actual completion date, whichever is earlier (as of 2026-06), per IRAS Buyer's Stamp Duty guidelines.
HDB vs Private Resale: Two Different Documents
Singapore operates two parallel OTP regimes. For HDB resale flats, the OTP is a prescribed form issued by HDB — sellers and buyers must use it exactly; no bespoke clauses may be added. For private resale properties (condominiums, landed houses, ECs after the 10-year MOP), the OTP is drafted by the seller's solicitor and can contain negotiated terms, though market practice is fairly standardised. The Council for Estate Agencies (CEA) regulates salespersons who facilitate both types and publishes guidelines on proper handling of OTP documents — see the CEA Key Duties of a Salesperson resource.
What Does It Mean?
Option to Purchase (OTP)
The Option to Purchase (OTP) is a legally binding agreement giving the buyer the exclusive right to purchase a property within a fixed period (usually 14 days for private, 21 days for HDB). The buyer pays an option fee (typically 1% of purchase price) which is forfeited if the option is not exercised.
Exercise Fee
The exercise fee is an additional payment (typically 4% of purchase price for private property, or up to 9% for HDB) made when the buyer exercises the OTP. Combined with the option fee, it forms the initial deposit before completion.
Worked Example
You find a condo you like at $1,500,000. The seller's agent issues an OTP:
If you exercise the OTP within 14 days, you pay the 4% exercise fee and a binding S&P Agreement is formed. If you let it lapse, you forfeit the $15,000 option fee.
Why It Matters
The OTP is the most critical document in any property purchase. Understanding the option fee, exercise deadline, and your rights during this period can save you from costly mistakes or losing your deposit.
Where to Find This on ShiokNest
- Property buying checklists
- Legal Conveyancing Checklist
- Stamp Duty Calculator
- Total Acquisition Cost Calculator
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Official Sources
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Private Resale OTP: Fees and Timeline (as of 2026-06)
For private residential properties, the option fee is negotiable between seller and buyer but is almost universally set at 1% of the purchase price by market convention. Upon receiving the option fee, the seller hands over the signed OTP. The buyer then has the Option Period — typically 14 calendar days, though 21 days is also commonly negotiated — to decide whether to exercise. To exercise, the buyer pays an exercise fee (commonly 4% of the purchase price), signs the OTP, and returns a duplicate to the seller's solicitor. The total deposit at the point of exercise therefore reaches approximately 5% of the purchase price. If the buyer does not exercise within the Option Period, the option fee is forfeited to the seller and the seller is free to relist. If the seller tries to back out after granting a valid OTP, the buyer may apply to court for specific performance — a remedy that compels the sale to proceed.
After exercise, the sale proceeds to completion (typically 8–12 weeks for private resale). BSD and ABSD are payable within 14 days of exercising the OTP (or 14 days of the completion date, whichever is earlier). Use ShiokNest's Stamp Duty Calculator to compute your exact BSD and ABSD liability before committing, and the Total Cost of Purchase Calculator to see how the option fee, exercise fee, duties, legal fees, and downpayment stack up.
HDB Resale OTP: Prescribed Form, Caps, and 21-Day Window (as of 2026-06)
HDB resale OTPs follow a government-prescribed format available on the HDB Buying Procedure for Resale Flats page. Key differences from private OTPs include:
- Option fee cap: The option fee for HDB resale is negotiable but capped at S$1,000 (as of 2026-06). Any amount above S$1,000 paid as an option fee is prohibited.
- Exercise fee cap: The exercise fee, paid when the buyer exercises the OTP, is negotiable but capped such that the combined option fee and exercise fee do not exceed S$5,000 (as of 2026-06). In practice, option fee + exercise fee = S$5,000 is the standard market ceiling.
- Option Period: Fixed at 21 calendar days under the HDB prescribed form — the buyer cannot negotiate a shorter or longer period.
- No extensions: Once granted, the 21-day period cannot be extended. If the buyer fails to exercise within 21 days, the option fee is forfeited and the seller may relist.
- HDB resale submission: After the buyer exercises the OTP, both parties must submit the HDB resale application via the HDB Resale Portal within 7 days of exercise (as of 2026-06). HDB then processes the application, conducts eligibility checks, and schedules the resale completion appointment.
Because HDB flat prices vary significantly by town, flat type, and storey, buyers should review the HDB Price Heatmap and check recent comparable transactions in their target town before agreeing on a purchase price — the price locked in the OTP is the price on which BSD and, if applicable, ABSD will be calculated.
What Happens to Stamp Duty?
BSD applies to all residential property purchases in Singapore. The rates are tiered: 1% on the first S$180,000, 2% on the next S$180,000, 3% on the next S$640,000, 4% on the next S$500,000, 5% on the next S$1,500,000, and 6% on the remainder (as of 2026-06). ABSD layered on top applies if you are purchasing a second or subsequent residential property, or if you are a non-citizen or non-PR buyer — rates vary by profile and were last revised in April 2023. Both taxes are payable within 14 days of exercising the OTP. Failure to pay on time attracts penalties. Confirm the current ABSD rates via the IRAS Additional Buyer's Stamp Duty page before signing any OTP.
Before Granting or Receiving an OTP
- Confirm the option fee amount and period in writing — for private properties, both the option fee percentage and the length of the Option Period are negotiated; get these agreed before any money changes hands.
- Engage a conveyancing solicitor early — instruct a solicitor before or immediately after receiving the OTP so they can review the document, raise requisitions, and prepare the sale and purchase agreement within the Option Period.
- Verify HDB eligibility before granting or exercising — for HDB resale, the buyer must have a valid HDB Flat Eligibility (HFE) letter before the OTP is granted (as of 2026-06). Sellers should request sight of this letter; buyers who do not hold one cannot proceed.
At the Point of Exercise
- Calculate your total upfront cash requirement — at exercise you will need the exercise fee (commonly 4% for private), plus BSD and ABSD due within 14 days. Use the Total Cost of Purchase Calculator to model the full cash schedule.
- Confirm your bank's in-principle approval (IPA) is current — banks' IPAs are typically valid for 30 days. If yours has lapsed during the Option Period, renew it before exercising so you know your loan quantum is confirmed.
- Check the option fee treatment for HDB — the combined option and exercise fees must not exceed S$5,000 (as of 2026-06). If a seller requests more, that excess is illegal and you should report it to CEA.
After Exercise
- Submit the HDB resale application within 7 days — for HDB OTPs, both buyer and seller must submit via the HDB Resale Portal within 7 days of exercise. Missing this window can invalidate the transaction.
- Pay BSD and ABSD within 14 days of exercise — for private resale, or within 14 days of the completion date, whichever comes first. Late payment attracts a penalty of up to 4× the unpaid duty.
- Model your financing against the locked price — the OTP exercise price is fixed. Use the Stamp Duty Calculator alongside your mortgage plan to confirm total cash outflow before the commitment is irrevocable.
Frequently Asked Questions
How long is an OTP valid for?
Can the option fee be negotiated?
What happens if I don't exercise the OTP?
This glossary article is auto-generated from ShiokNest's financial data and updated periodically. Rates and figures are current as of March 2026. Check official sources for the latest.