Official Source: Sap-Ing-Sith Act B.E. 2562 (2019) — Official PDF, Royal Gazette (ratchakitcha.soc.go.th)
Royal Gazette, Volume 136, Part 56 ก, dated 30 April B.E. 2562
English Translation: Sap-Ing-Sith Act B.E. 2562 (2019) — Full English Translation
What Is Sap-Ing-Sith?
Sap-Ing-Sith (ทรัพย์อิงสิทธิ) is a registered real right to use and benefit from immovable property in Thailand under the Sap-Ing-Sith Act B.E. 2562 (2019). Recorded directly onto the property’s title deed, this distinct statutory instrument grants the holder ownership-like transfer, inheritance, and financing rights for a maximum term of 30 years.
Unlike a traditional lease agreement under the Thai Civil and Commercial Code (CCC), a Sap-Ing-Sith functions as an independent, transferable asset class. It can be freely assigned to third parties without the landowner’s prior consent, safely forms part of a holder’s inheritable estate, and can be registered at the Land Office as collateral for a bank mortgage. Any subsequent purchaser of the underlying land takes ownership strictly subject to the pre-existing registered Sap-Ing-Sith right.
Sap-Ing-Sith derives its legal authority from Section 1298 of the Civil and Commercial Code, which states that real rights may be created “by virtue of this Code or other laws.” The Act is one such other law — it operates within the CCC framework, not outside it. It was enacted because the CCC lease, in the legislature’s own words, is “a contractual right enforceable between the contracting parties specifically” with “certain limitations regarding its economic utilisation” — a structural gap the dedicated Act was designed to fill.
Eligible Property Types
A Sap-Ing-Sith right can legally be created and registered only over three specific types of real estate assets in Thailand:
- Land with a full Chanote title deed (Nor Sor 4).
- Land including buildings constructed on Chanote-titled land.
- Condominium units registered under the Condominium Act.
Key Features at a Glance
| Feature | Legal Detail & Statutory Scope |
|---|---|
| Maximum Term | 30 years — An absolute hard cap with no statutory right to renewal within the original Act. |
| Property Scope | Must cover the whole property — Partial registration over a fraction of a single title deed or condo unit certificate is strictly prohibited. |
| Transferability | Freely transferable — The holder can sell, assign, or transfer the remaining term to a third party without requiring landowner consent. The Land Office notifies the landowner after registration; consent is not required before. |
| Mortgageability | Collateral-ready — The Sap-Ing-Sith right itself (not the underlying land ownership) can be mortgaged under the Civil and Commercial Code. |
| Inheritance | Passes to heirs — The right does not terminate upon the holder’s death; it automatically transfers into the holder’s inheritable estate. |
| Subdivision/Merger | Prohibited — Land bound by an active registered Sap-Ing-Sith cannot be subdivided into multiple plots or consolidated into another parcel. |
| Land Ownership Sales | Permitted — The landowner retains the right to sell or mortgage the underlying land, but any new buyer takes it subject to the active Sap-Ing-Sith. |
| Competing Real Rights | Restricted — The landowner cannot create new real rights (such as a usufruct or habitation) without the express written consent of the Sap-Ing-Sith holder. |
| Building Reversion Rule | Automatic Reversion — Under Section 11, any structures modified or newly constructed by the holder automatically revert to the landowner upon termination, unless a contrary agreement is explicitly recorded in the certificate. |
| Administrative Autonomy | The SIS holder has the rights, duties, and liabilities of the property owner (Section 11), including the ability to apply for construction permits, utility connections, and dealings with government authorities in their own name — without requiring the landowner’s involvement. |
| Registration Requirements | Mandatory — Must be registered at the local Land Office using official forms ท.ส.1 (land) or ท.ส.2 (condominium unit), which issues the Certificate of Sap-Ing-Sith (หนังสือรับรองทรัพย์อิงสิทธิ) in duplicate (one for the holder, one for the archives). |
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Critical Note (Section 11)
The building reversion rule is the most significant provision for investors planning construction. The statutory default transfers ownership of any buildings or structures you modify, extend, or construct to the landowner when the term expires. An alternative arrangement is possible — Section 11 explicitly permits the parties to agree otherwise — but must be negotiated and recorded at the time of registration. This is not a clause to address later: once the SIS is registered without a contrary agreement, the default reversion applies for the full 30-year term.
This rule does not apply to condominium units governed by the Condominium Act; modifications or improvements to a registered condominium unit are not subject to reversion. The same section also reserves two rights exclusively to the landowner: the right of revendication (to reclaim the property from an unlawful possessor) and the right to prevent unlawful interference by third parties. If either situation arises, the holder’s obligation under the Act is to notify the landowner promptly.
A related point on compensation agreements: some parties agree that the holder will receive compensation for buildings at expiry rather than having them revert. This is permissible under Section 11 — but based on the official categories of registrable juristic acts under the Act (transfer, mortgage, inheritance, and related registrations), a compensation-on-expiry obligation is not clearly registrable as a juristic act in the certificate itself. The conservative position is to treat it as a contractual covenant between the original parties only, not as a registered right binding on future owners, unless the competent Land Office explicitly confirms it will record the obligation in the certificate text.
Key Registration Fees
Registration fees for Sap-Ing-Sith are set by Ministerial Regulation under the Act and may not exceed the rates in the Act’s Schedule:
| Fee | Amount |
|---|---|
| Registration / establishment | 20,000 THB flat |
| Certificate issuance | 10,000 THB |
| Transfer of the right | 2% of declared value |
| Mortgage of the right | 1% of declared value |
| Cancellation before expiry | 20,000 THB flat |
The flat 20,000 THB establishment fee can be competitive for high-value transactions. The more significant cost factor is professional time and timelines: Land Office unfamiliarity with SIS typically means more preparation and unpredictable processing times compared to a standard lease registration. Note also that early cancellation — for example as part of a restructuring — carries its own 20,000 THB fee, meaning a cancel-and-re-establish sequence costs 40,000 THB in registration fees alone before professional costs.
On transfer fees: the 2% rate applies to the “declared capital value” under the Act’s Schedule. For standard property transactions, the Land Department compares the declared price against the Treasury Department’s official appraised value and charges against the higher figure. For Sap-Ing-Sith transfers, no separate appraisal baseline for the right itself exists — Land Offices may assess the 2% against the full declared transfer value. Given the near-zero number of SIS transfers to date, there is no established practice on this point. Investors contemplating a mid-term assignment should obtain a specific valuation opinion before contracting.
The Reality: Sap-Ing-Sith Is Barely Used
Sap-Ing-Sith has seen extremely limited uptake since the Act came into force in October 2019. Registrations likely remained in the dozens in the years following — a vanishingly small number for a nationwide statutory instrument. For comparison, Thailand processes tens of thousands of lease and sale registrations each month.
The consequences for any investor considering Sap-Ing-Sith today are real:
- No case law. Thai courts have not interpreted a single dispute under this Act. How courts will handle contested transfers, mortgaged rights, bankruptcy of the landowner, or expropriation of registered land is entirely untested.
- Land Office unfamiliarity. Many provincial Land Officers have never processed a Sap-Ing-Sith transaction. Delays and requests for documentation beyond what the Act requires are common.
- No secondary market. There is no market for traded Sap-Ing-Sith rights. The theoretical transferability and mortgageability of the right is largely academic until lenders and buyers develop practical acceptance — which requires more transactions and more legal precedent.
Working with Sap-Ing-Sith today means being a first mover. That carries both the opportunity and the costs of doing something the system is not yet accustomed to.
Sap-Ing-Sith vs. Long-Term Lease: An Honest Comparison
| Feature | Sap-Ing-Sith | Long-term lease (CCC) |
|---|---|---|
| Maximum term | 30 years | 30 years |
| Transfer without landowner consent | Yes | No — lease is personal |
| Survives sale of land | Yes (registered on title deed) | Only if registered |
| Can be mortgaged | Yes — the right itself | No |
| Landowner can create competing real rights | No — requires SIS holder’s written consent | Yes |
| Land Office familiarity | Low — registrations remain extremely rare | High — routine transaction |
| Legal precedent | None | Extensive |
| Lender acceptance | Developing | Established |
| Risk of registration difficulties | Real | Minimal |
The practical reality: a lease and a Sap-Ing-Sith right are not interchangeable — they are different instruments serving different needs. A lease is a personal contractual right; it cannot be transferred without the landlord’s consent and cannot be mortgaged. SIS is a real right with both those capabilities built in by statute. For an investor who does not need transferability or financing of the right itself, a lease is simpler to execute and better understood by the market today. For an investor who does need those features, a lease cannot deliver them at all — SIS is the only available instrument under Thai law. The execution friction of SIS today is real. That is a reason to plan carefully and engage experienced counsel — not a reason to choose the wrong instrument for the transaction.
When Sap-Ing-Sith Is the Right Choice
The starting question is not “lease or SIS?” but “what does this transaction actually require?” There are specific transaction types where SIS is the only instrument that delivers what the deal needs — where the features a CCC lease structurally cannot provide are exactly what is required:
- Commercial development requiring secured financing against the use right. A developer who does not own the underlying land but needs to mortgage something to secure construction financing has no path forward with a lease — leases cannot be mortgaged under Thai law. SIS can be mortgaged (Section 12). For large-scale development on third-party land, this is the primary functional case.
- Structures requiring unrestricted mid-term assignment. Joint ventures, holding company reorganisations, and cross-border corporate transactions may require the use right to be transferred between group entities, contributed to a new vehicle, or sold as part of a broader asset package — without the original landowner’s signature at each step. SIS achieves this; a lease does not.
- Transactions where future landowner risk is a concern. A registered SIS is noted on the title deed and binds any future owner of the land by operation of law. A registered lease binds future owners too — but the SIS’s position on the title deed provides clearer constructive notice and leaves less room for dispute in a contested transfer. Where the landowner’s succession situation is complex (multiple heirs, aging title holder, land held through a family structure), this added protection has practical value.
- Situations where the landowner’s ability to encumber the property must be restricted. Once SIS is registered, the landowner cannot create any further real right over the property without the SIS holder’s written consent (Section 9). A CCC lease carries no equivalent protection: a landowner can in principle grant a usufruct or habitation right that may complicate the lessee’s position.
- Transactions where landowner insolvency is a material risk. As a real right recorded on the title deed, a Sap-Ing-Sith right should in principle bind any future owner — including a liquidator or bankruptcy receiver — in the same way a mortgage binds an insolvent estate. Land encumbered by a registered SIS would theoretically be liquidated subject to that right, not free of it. A registered CCC lease also has in-rem characteristics, but the SIS’s direct inscription on the title deed provides a cleaner priority chain. Important caveat: this analysis has never been tested in a Thai court. There is no case law on how SIS behaves in a landowner insolvency. Investors relying on this protection for high-value transactions should obtain specific Thai legal advice and not treat it as settled law.
For straightforward residential use or small commercial occupancy — where the investor does not anticipate assigning or financing the right — the execution complexity of SIS today adds friction without adding value. A registered lease is the simpler path for those transactions. The choice should follow the transaction’s requirements, not habit or default.
Using Sap-Ing-Sith to Restructure Existing Land-Holding Structures
Many foreign investors hold Thai real estate through a Thai-majority limited company with nominee shareholders — a structure that is both illegal and now subject to systematic enforcement under Thailand’s 2026 Land Department measures. When these structures are unwound, Sap-Ing-Sith is one instrument considered for securing the investor’s rights going forward.
Several scenarios arise in practice. The Thai company may grant SIS directly to the investor while retaining ownership. The land may be sold to a Thai individual, who then grants SIS. Or a new Thai entity acquires the land and grants SIS as part of a clean restructure. In each case, the investor ends up with a registered right over the land rather than dependence on a company structure.
In practice, it is harder than it looks.
The restructuring itself attracts scrutiny. The May 2026 DOL circular specifically flags restructured companies as a priority investigation category. A Thai company granting SIS to its former foreign investor — effectively forfeiting 30 years of economic benefit — raises exactly the nominee question the investor is trying to resolve. Structure, timing, and commercial rationale will all be examined by automated screening tools: the DBD has operated its Intelligence Business Analytics System (IBAS) since October 2025, cross-referencing corporate registry data with financial and land records to flag transactions that fit nominee patterns. A restructuring into SIS is not a workaround — it is a transaction that will be reviewed.
Untested territory. Land Officers processing a restructuring into SIS for a foreign holder are operating without established precedent or central guidance.
30-year ceiling. The maximum term is 30 years with no statutory renewal right. For long-horizon investments, this is a structural constraint to address at the outset.
The forfeiture risk. Under current law, a confirmed nominee arrangement leads to forced sale — the investor recovers proceeds. A proposed amendment to Land Code Section 94 would replace this with outright forfeiture to the state — no compensation. This is not yet law but is under active legislative study. It changes the risk calculus materially. Recent enforcement underscores the point: a May 2026 crackdown on Koh Phangan resulted in 22 foreign nationals arrested and over 200 million THB in land seized in a single operation, with DSI leading coordinated raids across law firms, accounting offices, and nominee companies simultaneously.
SIS can be the right instrument in a restructuring — but only as part of a comprehensive legal process with full awareness of the current enforcement climate. Qualified Thai legal counsel is required.
For the enforcement framework: Thailand’s Nominee Land Crackdown: New Land Department Enforcement Measures (2026)
Reform Proposals: What to Know
Reform proposals for extending Thai property rights for foreigners — including longer lease terms and Sap-Ing-Sith term extensions — recur periodically in policy discussions, typically driven by real estate industry lobbying. None have been enacted. Both are subject to a 30-year ceiling under current law. Structure any transaction on what the law says today.
Frequently Asked Questions
Q: Is Sap-Ing-Sith the same as a long-term lease?
No. They are separate instruments. The key differences: SIS is freely transferable without the landowner’s consent, can be mortgaged, and is registered directly on the title deed. A lease is a personal right between two parties. In practice, leases are far more commonly used and better understood by the market.
Q: Is the 30-year term automatically renewable?
No. The Act contains no renewal right. The parties may register a new SIS at the end of the term if both agree — but there is no statutory entitlement.
Some transaction documents include a “30+30” promise: a contractual clause by which the landowner agrees at signing to grant a second 30-year SIS when the first expires. This clause is a personal obligation (jus in personam), not a real right. It binds only the original landowner who signed it. If the underlying property is sold, or if the landowner dies before the end of year 30, the new owner is generally not bound to honor that promise — they did not make it, and it is not recorded as a real right on the title deed. A Thai court may award damages against the estate of a landowner who fails to renew, but it cannot force a new owner to grant rights they never agreed to. The “30+30” framing appears in real estate marketing materials and in some transaction documents, but the legal reality is that a second term is a contractual expectation, not a property right. Structure the transaction on the 30-year term you have, not on the renewal you were promised.
Q: What happens to buildings I construct?
Under Section 11, buildings you construct are yours during the term. On termination, they revert to the landowner unless the parties agree otherwise and record that agreement at registration. For any development involving significant construction, this is the most important clause to negotiate — and it must be addressed before the SIS is registered, not after.
Q: Can a foreigner hold Sap-Ing-Sith?
The Act does not prohibit it. There is no published Land Department instruction on how foreign-held SIS applications should be processed; practical treatment may vary by office. The right does not give land ownership. Qualified legal advice and early engagement with the relevant Land Office are essential.
Q: Is Sap-Ing-Sith widely used?
No. Registrations since the Act came into force in 2019 have remained extremely low by any measure. There is no established market practice, no case law, and limited Land Office familiarity with the instrument. This is a material practical consideration for any investor.
Q: Should I use Sap-Ing-Sith or a long-term lease?
For most investors today, a registered long-term lease provides core protection with far less execution risk. Sap-Ing-Sith becomes genuinely superior where free transferability or mortgageability of the right is a transaction requirement — for example, in a commercial development that requires bank financing secured against the use right, or in a corporate structure where the right may need to be assigned between entities without the landowner’s sign-off. Take qualified legal advice specific to your situation.
Conclusion
Sap-Ing-Sith is a legally sound and intelligently designed instrument — registered, transferable, mortgageable, and binding on future landowners. For certain transactions, particularly those where an investor needs more than a personal right against a single landowner, it offers features that a lease structurally cannot provide.
The honest assessment is that SIS remains a marginal instrument in Thailand’s property market. Extremely low registrations since the Act came into force, no case law, limited Land Office experience, and no established lending or secondary market mean that using it today requires patience, careful planning, and experienced Thai legal counsel. It is not a plug-and-play alternative to a lease. Investors who proceed should do so with realistic expectations about the timeline and effort involved.
The right question is not whether SIS or a lease is better in the abstract — they are different instruments solving different problems. A lease cannot be transferred without the landlord and cannot be mortgaged; those are structural limits, not gaps that drafting can cure. SIS solves both. The execution friction of SIS today is real and should not be minimised. But friction is a planning problem, not a legal defect. Match the instrument to what the transaction requires.
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