Stamp Duty When Assigning or Subselling an OTP

Tax & policy · Stamp duty

By Winfred Quek, Associate Marketing Consultant · CEA R073319H · Crestbrick Pte Ltd (L31010886H) · Published 13 July 2026

Quick answer: Assigning or subselling an Option to Purchase before you exercise it creates two separate stamp duty questions, not one. The first is straightforward: Buyer's Stamp Duty on the property itself is paid once, by whoever actually exercises the Option, calculated on the purchase price or market value, whichever is higher. The second is the part people miss: the act of assigning your rights under the Option to someone else, particularly if you are paid a premium for doing so, can itself be a separate dutiable transaction, distinct from the duty on the eventual property sale. This is a technical, fact specific area, and the correct treatment depends on exactly how the assignment is documented, so it is not something to structure without a conveyancing lawyer and direct confirmation from IRAS.

Facts verified: 13 July 2026 · Mechanics described qualitatively; confirm current treatment with IRAS or a conveyancing lawyer before structuring any assignment · Sources attributed below

Every so often a client asks me about buying an Option to Purchase and reselling it before completion, usually because they have heard of someone doing it on a new launch and turning a profit without ever taking title. The strategy itself is a separate conversation about process and returns, which I cover elsewhere. This guide is narrower and more mechanical: what actually happens to stamp duty when you assign or subsell an OTP, because this is the part that gets glossed over in casual conversation and is exactly where a buyer can get caught out.

What assigning or subselling an OTP actually means

When you hold an Option to Purchase, you hold a contractual right to buy a specific property at an agreed price within the option period, in exchange for the option fee you paid. You have not yet bought the property. Assigning or subselling the OTP means transferring that right to someone else before you exercise it, so that the new party, not you, ends up signing the sale and purchase agreement and taking on the purchase. This is distinct from selling a property you already own, because at the point of assignment you never held legal or equitable title, only the contractual right to acquire it.

This structure shows up most often around new launches, where an early buyer sees strong demand build after their purchase and looks to pass the Option along, sometimes at the original price and sometimes at a premium reflecting the appreciation in perceived value since the launch. It can also happen in resale contexts, though it is less common there.

The first stamp duty touchpoint: duty on the eventual purchase

Buyer's Stamp Duty is triggered by the acquisition of the property itself, and it is computed once, on the purchase price stated in the sale and purchase agreement or the market value of the property, whichever figure is higher. The obligation sits with whoever actually exercises the Option and becomes the purchaser under that agreement. If you assign your rights away before exercising, you never become the purchaser, so the BSD on the property is not your obligation. It falls to your assignee, calculated in the ordinary way once they exercise.

This part is the least controversial piece of the mechanics, and it mirrors how BSD would apply to any direct purchase. The complexity begins with the second touchpoint.

The second touchpoint: duty on the assignment itself

A premium for assigning rights can itself be dutiable. If you receive payment, over and above simply being reimbursed your original option fee, in exchange for assigning your rights under the Option to someone else, that transaction involves valuable consideration changing hands for a right connected to property. Depending on how it is structured and documented, this can be treated as its own dutiable event, separate from the BSD payable when the property is eventually conveyanced. The precise treatment is technical and depends on the facts of the assignment, so this is not something to assume either way without direct confirmation.

This is the single most important thing to understand before attempting an OTP assignment for profit. It is not automatically the case that the only stamp duty in play is the BSD your assignee eventually pays on the property. The profit you personally realise from passing along the right to buy can attract its own scrutiny and, potentially, its own duty. Structuring the paperwork correctly, and getting written confirmation of the intended treatment before money changes hands, is not optional diligence here, it is the difference between a clean transaction and an unwelcome assessment later.

Why this is different from Seller's Stamp Duty

Seller's Stamp Duty is built around the disposal of a residential property that you have purchased and held, with the duty rate stepping down the longer you hold before selling. Because an OTP assignment happens before you ever exercise and take on the purchase, you have not disposed of a property you own in the ordinary SSD sense. Whether and how SSD style thinking applies to a profit made purely from assigning contractual rights before completion is a genuinely technical question, and treating it as automatically exempt, or automatically caught, are both assumptions I would not make on a client's behalf without checking first. This is precisely the kind of edge case worth a direct query to IRAS or your conveyancing lawyer before you commit to a structure.

ABSD follows the person who actually exercises

Additional Buyer's Stamp Duty is assessed on the profile of whoever becomes the purchaser under the sale and purchase agreement, which means it follows your assignee, not you. If your assignee is a foreigner, a Permanent Resident, or already owns other property, their own applicable ABSD rate applies in full once they exercise, calculated on their own citizenship and property count, entirely independent of what your ABSD position would have been had you exercised yourself. This is worth flagging clearly to any assignee before the transfer of rights, since it directly affects how much cash they need to bring to the eventual purchase.

Getting this stamped correctly, in practice

Engage a conveyancing lawyer before assigning anything. The documentation of an assignment, and how any premium is characterised, materially affects the stamp duty outcome. This is not a do it yourself paperwork exercise.
Confirm the treatment with IRAS or your lawyer in writing. Do not rely on informal precedent from someone else's transaction, since the facts and documentation of each assignment differ.
Disclose the ABSD implications to your assignee clearly. Their profile, not yours, determines what they owe once they exercise, and they need to plan for it.
Keep a clean paper trail of the original option fee versus any premium received. This distinction matters for how the transaction is characterised and assessed.

None of this means assigning an OTP is off limits. It happens, and it can be done properly. But it is a technical corner of stamp duty law, not a casual side deal, and the cost of getting the structure wrong is not a rounding error.

Frequently asked questions

Do I pay stamp duty twice if I assign my OTP before exercising it?

Buyer's Stamp Duty on the property itself is generally paid once, by whoever actually exercises the Option and takes on the sale and purchase agreement, computed on the purchase price or the market value, whichever is higher. But the act of assigning your rights under the Option for a premium can be a separate dutiable event in its own right, since it involves consideration changing hands for a valuable right. Whether that second duty applies, and how it is calculated, depends on the structure of the assignment, so this needs to be confirmed with IRAS or a conveyancing lawyer before you sign anything, not assumed.

Who pays Buyer's Stamp Duty when an OTP is assigned to someone else?

The person who ultimately exercises the Option and becomes the purchaser on the sale and purchase agreement is generally the one responsible for the Buyer's Stamp Duty on the underlying property, calculated on the purchase price or market value, whichever is higher. If you assigned your rights before exercising, you as the original optionee did not become the purchaser of the property itself, so the BSD obligation on the property sits with your assignee.

Does Seller's Stamp Duty apply if I assign an OTP before exercising it?

Seller's Stamp Duty is designed around the disposal of a residential property you have purchased, and the mechanics of how an unexercised Option assignment is treated for SSD purposes can be technical and fact specific. Rather than assuming SSD does or does not apply to your situation, treat any profit made from assigning an OTP as a scenario requiring direct confirmation from IRAS or a property lawyer before you commit to the arrangement.

Does ABSD apply to the person who ends up exercising an assigned OTP?

Yes. Additional Buyer's Stamp Duty is assessed based on the profile, citizenship status and existing property count of whoever actually exercises the Option and becomes the purchaser, not the profile of the original optionee who assigned it away. If the assignee is a foreigner, a Permanent Resident, or someone already holding other properties, their applicable ABSD rate applies in full, regardless of what the original optionee's own ABSD position would have been.

Considering an OTP assignment or subsale?

The stamp duty structure here is technical enough that a wrong assumption can be expensive. A Property Portfolio Analysis maps the full financial picture before you sign an assignment, so you and your lawyer are working from the right numbers.

Book a free analysis call

Winfred Quek is Associate Marketing Consultant at Crestbrick Pte Ltd, advising Singapore upgraders, investors and families. CEA R073319H. The information on this page is general and does not constitute financial, investment, tax or legal advice. Stamp duty treatment of OTP assignments is technical and fact specific; engage a conveyancing lawyer and confirm the applicable treatment with IRAS before structuring any assignment or subsale.

Stamp duty when assigning or subselling an OTP