Stamp Duty in Thailand for Company and Property Documents

Thai stamp duty is document-based. The Revenue Department describes it as a duty on instruments listed in the Stamp Duty Schedule, not a tax that automatically follows every commercial transaction. A payment, lease negotiation or transfer of value can exist without creating stamp duty unless the document used for it falls within a scheduled category.

The label on the file is not decisive. A document called an “agreement”, “letter” or “memorandum” may still function as a lease, loan, authorization or another scheduled instrument. Classification comes from what the document does and how the schedule defines that instrument, because the classification determines the calculation base, rate and responsible parties.

That distinction becomes clearer in a share deal. The commercial sale of shares and the instrument that transfers the shares are related, but they are not the same analytical step for stamp duty. A business file can also contain a loan agreement, a guarantee and an authorization letter, each with its own treatment even though they support the same transaction.

Start with the instrument, not the percentage. Once the category is correct, the rate is usually straightforward; when the category is wrong, even a mathematically correct calculation can produce the wrong duty and the wrong compliance trail.

The recurring instruments for a foreign company owner are fairly predictable, but they do not all behave alike. A lease of land, a building or other construction is charged by reference to rent and key money for the full lease period. If no term is stated, the schedule applies a three-year assumption for stamp duty purposes, and continued occupation after expiry can trigger its own renewal rule.

Corporate files commonly contain share transfers, loans or overdraft agreements, and hire-of-work contracts. Their rates may look small, yet the calculation bases are different. A share transfer uses the value rule stated in the schedule; a loan is based on the loan or agreed overdraft amount and has a THB 10,000 cap; hire of work is based on remuneration, with a mechanism for estimation and later adjustment when the final amount is not known at execution.

Authority documents need careful separation. An authorization letter, a proxy for voting at a company meeting and an agency instrument appear as different schedule items. They have different fixed rates and different party labels, so treating every authority document as a generic “power of attorney” can lead to the wrong stamping treatment.

Guarantees are another scheduled category. A guarantee attached to a financing arrangement can therefore create a separate stamp duty question from the loan agreement itself. One transaction file may contain several scheduled instruments, and Section 108 of the Revenue Code also addresses cases where different instruments appear on the same piece of paper or in one document.

This is not an attempt to reproduce the entire schedule. The official list is much broader and includes bills, cheques, insurance documents, receipts and corporate filings. For an unusual document, use the full schedule and classify the actual legal function before applying a rate.

The schedule separates two roles: the person liable to duty and the person liable to cancel the stamp. They are not automatically the same person, and the party that physically sends the money is not necessarily enough to identify the legal compliance role.

For a lease, the schedule places duty on the person providing the rent and cancellation on the tenant. A share transfer lists the transferor as liable and the transferee as the cancelling party. For a loan, those roles sit with the lender and borrower. A hire-of-work contract is simpler because the contractor appears in both columns.

Authority documents have their own allocations. An authorization letter lists the principal and agent, while a company-meeting proxy is a separate schedule item with its own rates and party labels. Similar commercial purpose does not make the instruments interchangeable for stamp duty.

Section 107 also refers to the position where there is no other agreement between the parties. That means contractual allocation should be read carefully rather than treated as a casual reimbursement clause. A contract may shift the economic cost or address who handles the process, but the wording and the instrument-specific procedure still need to be checked before assuming that every statutory or procedural responsibility has moved.

For a clean company file, record three things separately: the schedule party liable to duty, the party responsible for cancellation or equivalent proof, and any contractual arrangement about who ultimately bears the cost.

Thai stamp duty rates are easy to misread when they are converted into a single percentage. The schedule does not impose a flat 0.1% rule across contracts. Each instrument has its own charging base, and several categories use fixed baht amounts instead of a percentage-style calculation.

A lease of land, a building or other construction is charged at THB 1 for every THB 1,000 or fraction of rent and key money for the entire lease period. The full-term base matters. Looking only at the monthly rent can materially understate the amount if there is a separate key-money payment or another amount falling within the schedule wording.

A share transfer also uses THB 1 per THB 1,000 or fraction, but the schedule compares the paid-up value of the shares with the nominal value of the instrument and uses the greater figure. That is why the commercial purchase price should not be inserted automatically as the tax base without reading the actual schedule item.

For a loan or bank overdraft agreement, the rate is THB 1 per THB 2,000 or fraction of the loan or agreed overdraft amount, with the duty capped at THB 10,000. Hire of work is THB 1 per THB 1,000 or fraction of remuneration. An authorization letter is different again: it carries a fixed THB 10 or THB 30 charge depending on the scope and structure of the authority granted.

The arithmetic is usually the last step, not the first. These figures were checked against Revenue Department materials on 6 October 2026; exemptions, instrument wording and the current procedure still need to be matched to the document being executed.

The Revenue Department currently presents three stamp-duty payment formats. The first is e-Stamp Duty, which supports applications for both electronic and paper instruments. Once payment is completed, the system can issue an electronic receipt and a certification code, with QR or code-based verification available through the Revenue Department site.

The second route is payment in money at a Revenue Office for instruments and procedures that use that channel. The third is the traditional adhesive stamp, which is affixed and cancelled where that method remains applicable. These are not three interchangeable choices for every document; the correct route depends on the instrument and the current administrative procedure.

Electronic execution needs its own compliance trail. An electronic instrument does not require a physical stamp merely because older paper contracts used one, and a bank transfer does not by itself prove that e-Stamp Duty was properly completed. The official system creates evidence tied to the stamp-duty application.

Keep that evidence with the executed instrument. Depending on the method, the useful record may include the Revenue Department receipt, certification code, QR record or office-issued proof. An invoice or a screenshot from online banking can support an internal payment history, but it should not be treated as a substitute for official stamp-duty evidence where the Revenue Department provides separate verification.

That record becomes valuable later, when the document is reviewed for litigation, a share transaction, financing or an internal audit. A file should show what instrument was stamped, how it was paid and how the payment can be verified, not merely that someone remembers paying it.

For an adhesive stamp, the Revenue Code ties stamping to execution: the stamp is to be affixed before or immediately when the instrument is executed and then cancelled. That timing should not be copied onto every e-Stamp scenario. Electronic stamping follows its own filing procedure, so the operative deadline needs to be checked for the instrument and payment method in use.

A document executed outside Thailand has a specific rule. Section 111 gives the first holder in Thailand 30 days from receipt of the instrument to pay the full duty by stamping and cancelling. The practical date to preserve is therefore not only the overseas signature date, but also when the first holder in Thailand actually received the document.

For an instrument executed in Thailand that was not duly stamped on time, Section 113 provides a limited voluntary-correction window. If it is presented to the tax official within 15 days from the date on which it should have been duly stamped, the official can accept the scheduled duty without a surcharge.

Later correction is more expensive. Within 90 days of the required stamping date, the surcharge is twice the duty or THB 4, whichever is higher; after 90 days, it is five times the duty or THB 10, whichever is higher. The underlying duty is still payable. If the failure is found through an inspection, complaint or information supplied to the authorities, Section 114 uses a stricter regime; a completely unstamped instrument can attract a surcharge of six times the duty or THB 25, whichever is higher.

Backdating the document is not a legitimate cure. The useful exercise is to reconstruct the instrument category, the original due date, the applicable payment route and the duty plus any surcharge. For an electronic instrument, also confirm the current e-Stamp filing mechanics rather than assuming that the paper-stamp timeline maps across unchanged.

The amounts can be small enough to look administrative, but the consequence is tied to the status of the instrument, not to the size of the tax. Late correction can bring surcharges, and a failure discovered by the authorities can be treated more severely than a voluntary correction.

Section 118 is the provision that makes an unstamped file a litigation issue. An instrument that is not duty stamped, including its duplicate or copy, cannot be used as evidence in a civil case until the duty has been paid in full by stamping and cancelling. Paying later does not erase the Revenue Department’s right to impose the relevant surcharge.

That rule should not be rewritten as “the contract is automatically void.” Contract validity and evidential use are different questions. A document may still exist as an agreement between the parties while becoming awkward to rely on precisely when a dispute makes documentary evidence critical.

Section 119 creates a second practical constraint. Where a government or municipal official must acknowledge, sign, allow execution of or record the instrument, the official is not to do so until the scheduled duty has been paid. The compliance problem can therefore surface at an official filing or recording stage, not only in court.

Stamp duty is best treated as part of document hygiene. Correct classification, payment and verifiable proof are usually inexpensive compared with reconstructing a file after a dispute, corporate change or registration has already made the document important.

A useful stamp-duty check can be done before the signed document reaches accounting. Start by describing the instrument by legal function: lease, loan, share transfer, hire of work, guarantee, authorization or another schedule category. That first classification determines whether the schedule applies at all and which row controls the rest of the analysis.

Then separate the calculation from the parties. Record the charging base and rate, followed by the person liable to duty and the party responsible for cancellation or equivalent evidence. A vague internal note saying “the company will pay” does not answer those instrument-specific questions.

The payment route should be selected before execution where possible. Some instruments are handled through e-Stamp Duty, some through a Revenue Office process, and adhesive stamps still remain relevant in applicable cases. The file should end with official proof that can be matched back to the executed instrument.

Foreign execution adds a timing record: when did the first holder in Thailand receive the document? An old unstamped document requires a different mindset. The goal is to reconstruct the original due date, calculate the duty and any surcharge, and regularise the record without inventing a new signing history.

This is a compact document-control routine, not a reason to over-lawyer every agreement. Its value is that classification, calculation and proof are settled before the instrument becomes important in a dispute, official filing or later corporate transaction.