Disclaimer (Block 1): This article is for educational purposes only and is intended to assist CEA-registered property agents in understanding regulatory frameworks. It does not constitute financial, tax, or legal advice. LEVR's calculations are indicative only. Always verify rates and eligibility with your bank, HDB, CPF Board, or a licensed financial advisor before advising clients.
What Is an Option to Purchase?
An Option to Purchase (OTP) is a legally binding contract granted by the seller (Grantor) to the buyer (Grantee). It gives the buyer the exclusive right to purchase the property at an agreed price, subject to the buyer exercising the option within the stated option period. Once the seller grants the OTP, they cannot sell the property to anyone else during the option period.
In Singapore, the OTP is used across all property types — HDB resale flats, private resale properties, and new launch condominiums. The mechanics, timelines, and fees differ significantly between HDB and private transactions.
OTP for HDB Resale Flats
HDB uses a standardised OTP prescribed by HDB itself. Both buyers and sellers must use HDB’s official OTP form — agents cannot use a privately drafted OTP for HDB resale transactions.
| Step | Action | Timeframe |
|---|---|---|
| 1. HFE Letter | Buyer must obtain an HDB Flat Eligibility (HFE) letter before the OTP is granted. Without a valid HFE letter, the OTP cannot be registered with HDB. | Before OTP grant |
| 2. OTP Grant | Seller grants OTP to buyer. Buyer pays the option fee: minimum SGD 1 and maximum SGD 1,000 for HDB resale. The option fee is part of the purchase price. | Day 0 |
| 3. Option Period | Buyer decides whether to exercise. HDB OTP option period is fixed at 21 calendar days from the date of grant. This cannot be shortened or extended. | 21 days from grant |
| 4. OTP Exercise | Buyer exercises the OTP by signing the acceptance copy and paying the exercise fee. Exercise fee plus option fee must not exceed SGD 5,000 in total for HDB resale. Remaining deposit (typically 10% of purchase price) is paid at the first HDB appointment. | Within 21-day option period |
| 5. HDB Registration | Both buyer and seller submit the resale application via the HDB Resale Portal within 7 days of OTP exercise. | Within 7 days of exercise |
Key HDB OTP constraint: The HFE letter must be in force before the seller grants the OTP. Agents who allow sellers to grant the OTP before the buyer has a valid HFE letter risk the transaction being rejected by HDB.
OTP for Private Resale Properties
Private property OTPs are drafted by the seller’s solicitor. Unlike HDB, there is no standardised government form. The key commercial terms are negotiated between parties:
| Term | Typical Range | Notes |
|---|---|---|
| Option fee | 1% of purchase price | Paid by buyer to seller on grant of OTP. Non-refundable if buyer does not exercise. |
| Option period | 14 calendar days (market standard) | Can be negotiated. Longer periods may require a higher option fee. Cannot exceed 14 days for standard transactions under CEA agency guidelines unless expressly agreed. |
| Exercise fee | 4% of purchase price (additional) | Paid on exercise. Total deposit on exercise = option fee (1%) + exercise fee (4%) = 5% of purchase price. Balance 95% paid at legal completion. |
| Completion period | 10–12 weeks from exercise | Time for conveyancing, CPF drawdown, bank loan disbursement, and legal completion. Negotiable. |
The 1% option fee is paid when the seller grants the OTP. If the buyer does not exercise within the option period, the 1% is forfeited to the seller. The buyer has no further liability — the 1% is the cost of exclusivity.
Stamp Duty: When the Liability Is Created
This is the most important OTP concept for agents to explain clearly. Stamp duty liability — both BSD and ABSD — is triggered on the date the buyer exercises the OTP, not on legal completion. The buyer has 14 calendar days from the date of exercise to pay stamp duty (BSD and ABSD if applicable) to IRAS.
The practical implication: if your client has ABSD exposure (second property, SPR, foreigner), they must have the cash or CPF available to pay ABSD within 14 days of exercising the OTP. ABSD cannot be deferred pending completion or bank loan disbursement.
Agent workflow: Before a buyer exercises any OTP, run the ABSD and BSD numbers in LEVR. Confirm the client has sufficient liquid funds to cover both the exercise fee (4% for private) and the stamp duty liability (BSD + ABSD if applicable) within the 14-day window. This check should happen before the OTP is even granted — not after.
What Happens If the OTP Expires Unexercised?
If the buyer does not exercise the OTP before the option period expires:
- For HDB resale: The seller retains the option fee (maximum SGD 1,000). The OTP lapses. The seller can grant a new OTP to another buyer immediately — there is no cooling-off restriction on the seller.
- For private resale: The seller retains the 1% option fee. The buyer has no further liability and no claim on the property. The seller is free to market the property again.
An expired OTP is sometimes called an “abortive OTP.” From the buyer’s perspective, the only cost is the forfeited option fee. From the seller’s perspective, they have lost time and may have declined other offers during the option period.
OTP for New Launch Properties
New launch condominiums use a different process governed by the Housing Developers (Control and Licensing) Act (HDCLA). Key differences from resale OTPs:
- Booking fee: Buyer pays 5% of purchase price as a booking fee on the date of the booking. This is equivalent to the “option fee” in resale transactions.
- Option period: 3 weeks from the date of the OTP for the buyer to sign the Sale and Purchase Agreement (S&P). The developer issues the OTP within 3 working days of the booking.
- Progressive payment: Unlike resale transactions where the balance is paid at completion, new launch payments follow the Progress Payment Scheme (PPS) — staged payments tied to construction milestones.
- ABSD timing: ABSD is payable on the date of the S&P, not on the booking date or building completion. This means the buyer must pay ABSD (if applicable) at the start of the progressive payment schedule, not when they collect keys.
CEA Agent Obligations When Handling OTPs
CEA-registered agents have specific obligations around OTP transactions under the Estate Agents Act and CEA Practice Guidelines:
- Agents must not advise clients to sign an OTP without first ensuring the client understands their financial obligations (stamp duty, cash requirements, loan eligibility).
- For HDB transactions, the agent must verify the buyer’s HFE letter validity before the seller grants the OTP.
- Agents should recommend buyers engage their own solicitor before exercising any private property OTP — particularly where there are unusual conditions or encumbrances on the title.
- Option fees and exercise fees must be paid to the seller (or the seller’s solicitor’s escrow account) — not to the agent.
Common OTP Mistakes That Cost Clients Money
- Exercising before confirming ABSD funds: Stamp duty is due within 14 days of exercise. Clients who exercise and then discover they cannot pay ABSD on time face a 5% per annum late payment penalty from IRAS.
- Allowing the HFE letter to lapse: HFE letters have a validity period. If it expires before the OTP is granted, the HDB resale transaction cannot proceed until a new HFE letter is obtained.
- Not reading OTP special conditions: Private OTPs may include conditions such as “subject to the seller obtaining written release from the mortgagee bank” or “subject to CPF Board approval.” These conditions affect the buyer’s timeline and risk.
- Confusion between HDB and private OTP fee structures: HDB option fee is capped at SGD 1,000 and exercise fee brings the total deposit to SGD 5,000. Private market OTP fee is 1% with a 4% exercise fee. A buyer who is used to HDB transactions may not anticipate the much higher private market cash commitment on exercise.
Using LEVR Before Any OTP Is Exercised
The OTP exercise moment is when the buyer commits financially. Before that moment, run three checks in LEVR:
- ABSD check: In the ABSD Calculator, enter the buyer’s citizenship status, number of properties currently owned, and the purchase price. Confirm the ABSD quantum and that the buyer has the cash to pay within 14 days.
- BSD check: In the Stamp Duty Calculator, compute the BSD on the purchase price. Both BSD and ABSD are payable — some clients forget that BSD applies to all purchases, not just second properties.
- Affordability check: In the TDSR or Home Loan Calculator, stress-test whether the buyer qualifies for the loan at the agreed purchase price. If the buyer’s TDSR is marginal, the OTP exercise is premature until bank in-principle approval (IPA) is secured.
Disclaimer (Block 3): LEVR's calculator outputs are estimates based on inputs provided and current regulatory parameters as known at time of publication. They are not a guarantee of borrowing capacity, stamp duty liability, or CPF eligibility. Regulatory thresholds and rates may change. Always verify with IRAS, your bank, or a licensed financial advisor before making financial decisions.