Compiled by the YMTD Accounting Partner team · Information as of 13 November 2026

When asking whether a company affidavit (DBD company certificate) must be signed on every page when dealing with external agencies, the legal answer is that no provision in the Civil and Commercial Code requires certifying every page, because an affidavit is already a public document certified by the commercial registrar in their official capacity [1]. However, in practice, receiving agencies—including commercial banks, the Revenue Department, the Land Office, and government procurement bodies—all enforce regulations requiring authorized directors to sign certified true copies and affix the company seal on every single page. This prevents page substitution or data alteration. If directors fail to sign according to registered signatory terms, the entire document package loses legal binding effect and will be rejected immediately.

Key Takeaways

  • Legal Principle Under CCC Section 1020: A juristic person (company) certificate is a public document issued by the registrar by law, possessing inherent legal validity without any statutory rule obligating directors to re-certify every page [1].
  • Receiving Agency Requirements: Destination entities such as commercial banks, the Revenue Department, the Land Office, and the e-GP system require authorized directors to certify copies and stamp the company seal on every page to prevent document switching.
  • Binding Authority Under CCC Section 1167: Certifying documents on behalf of a company must strictly follow the registered condition in "authorized director signature conditions." If registered for two joint directors, a signature by only one person renders the document without legal binding effect [2].
  • Status of DBD e-Certificate Files: A PDF document carrying the digital signature of the registrar is valid under Section 7 of the Electronic Transactions Act B.E. 2544 (2001) [3]. However, once printed on paper, it becomes a "copy" requiring directors to certify and stamp according to receiving agency rules.
  • Document Validity Period: The law specifies no expiration date for an affidavit, but receiving agencies set their own validity limits: commercial banks and land offices usually require copies issued within 30 days, while tax matters with the Revenue Department generally accept up to 6 months [4].

Introduction and Scope: Practical Problems with Signing Corporate Documents

A juristic person certificate, or company affidavit, is the registration status certificate for a limited company (Co., Ltd.) or limited partnership issued by the Department of Business Development (DBD), Ministry of Commerce. This document contains vital information: corporate name, 13-digit registration number, registration date, registered capital, head office address, list of directors, director authority restrictions, and attached objectives. It serves as primary evidence of corporate identity for contracts, opening bank accounts, filing tax returns, and bidding on government tenders.

In practice, transaction delays usually stem from confusing "the legal validity of a public document" with "the document certification regulations of receiving agencies." Many company directors believe that because an affidavit already carries the registrar's seal and signature, signing only the first page or omitting the registered seal is sufficient. This leads to transaction rejections or contracts lacking binding effect under agency law. Business owners can explore broader use cases at what a company certificate can be used for to minimize operational errors.

Review of Relevant Laws and Regulations

Signing and stamping corporate documents are governed across multiple legal dimensions:

1. Civil and Commercial Code (CCC)

  • Section 1015: Establishes that a juristic person has rights, duties, and liabilities distinct from its shareholders and managing directors. Expressing corporate intent must therefore be carried out through its legal representatives.
  • Section 1020: Grants the public the right to inspect documents or request certified copies from the registrar [1]. An affidavit is thus a public document that enjoys an initial legal presumption of authenticity.
  • Section 1167: Prescribes that relations between directors, the company, and third parties are governed by the law of agency [2]. Consequently, if directors fail to sign in full accordance with registered authority conditions, the act does not bind the juristic person unless subsequently ratified.

2. Revenue Code and Tax Practices

Under Section 7 of the Revenue Code, the manager or representative of a juristic person must sign tax returns and documents submitted to revenue officers [5]. The Revenue Department previously ruled in tax ruling No. Kor Khor 0811/Por.15207 that a representative's signature under Section 7 is legally valid without needing the company seal, unless specific forms or regulations mandate otherwise [5]. Nevertheless, when applying for VAT registration (P.P.01) or handling general tax affairs, the Revenue Department requires an affidavit copy issued within the past 6 months, with authorized directors signing certified true copies and stamping the registered seal across every page [4].

3. Electronic Transactions Act B.E. 2544 (2001)

Obtaining an affidavit through DBD e-Certificate is legally recognized under Section 7 of the Electronic Transactions Act B.E. 2544 (2001), which forbids denying legal effect or enforceability solely because information is electronic [3]. A PDF file bearing the registrar's digital signature qualifies as an electronic original verifiable via the DBD e-Service Inquiry system for up to 1 year [7]. The government fee is 40 baht per item (standard complete set of 5 items totals 200 baht), whereas obtaining physical paper copies via partner bank counters incurs a 200 baht government fee plus individual bank service charges [6].

Practical Guide: How to Certify a Company Affidavit Correctly and Securely

Certifying a company affidavit involves standard steps and risk-mitigation measures that administrative teams and directors should follow:

1. Signing and Preparation Overview

Certifying a corporate document confirms that its contents accurately match the original register as of the submission date. Directors must sign strictly according to Condition 3 or Condition 4 of the affidavit and affix the company seal fully to establish binding power under CCC Section 1167 [2].

2. Prerequisites Before Signing

  • Latest Company Affidavit: Document age must meet receiving agency standards (within 30 days for banks and land offices; up to 6 months for the Revenue Department [4]). Review common pitfalls in 5 prohibitions when requesting a company certificate that business owners must know.
  • Registered Company Seal: Must be the physical official seal matching the design and text registered with the DBD registrar.
  • Blue Wet-Ink Pen: Used to distinguish live signatures from black-and-white photocopies clearly.
  • Complete Set of Attached Schedules: Corporate objective pages (Bor.Or.Jor.2 or Sor.Sor.Chor.1) and Bor.Or.Jor.5 (shareholder list) copies if required by the transaction.

3. Step-by-Step Signing Procedure

  1. Verify Director Authority Conditions: Check the section "Number or names of directors who can sign to bind the company." If two joint directors are required, both must sign together. A single signature leaves the document legally non-binding [2].
  2. Count and Arrange All Pages: Check page numbers in document corners (e.g., "Page 1 of 6") and arrange all primary data pages and attached objective pages in order.
  3. Write Certification and Restrict Document Purpose: Write by hand or stamp: "Certified true copy, used exclusively for (clearly specify transaction and recipient, e.g., applying for a business loan with Bangkok Bank, Suthep Road Branch, Chiang Mai)" along with the current date.
  4. Authorized Directors Sign: Authorized directors must sign live in person. Never use signature stamps or allow unauthorized signing without a power of attorney.
  5. Affix Company Seal: Stamp the company seal clearly in blue or red ink, overlapping part of the director's signature to prevent digital alteration.
  6. Complete Every Single Page: Repeat steps 3 through 5 on every sheet of the document, including attached objective schedules.

4. Troubleshooting Common Issues

  • Problem: Authorized directors are unavailable to sign together
    Solution: Prepare a specific Power of Attorney authorizing a proxy, signed and stamped by all required directors per registered conditions. Affix a 10 baht duty stamp (for a single transaction) or 30 baht (for multiple transactions) under the Revenue Code, and attach signed ID card copies of all directors.
  • Problem: Company seal is smudged, faint, or uneven
    Solution: Do not scrape or restamp over the original imprint. Cross out the defective stamp, imprint a clean seal in adjacent blank space, and have directors initial beside the change.
  • Problem: Objective pages were left unsigned because they already have the registrar's stamp
    Solution: Have authorized directors sign and stamp in the lower blank margins across every page of the objective schedule.

5. Summary of Best Practices

The safest standard practice is always: "Sign per registered binding authority + affix registered corporate seal + specify restricted purpose with date + certify every page" whenever presenting paper documents to external organizations.

Why Consulting an Accounting Service Expert in Chiang Mai Reduces Tax and Document Risks

Managing corporate documents directly impacts routine accounting and periodic tax filings. Northern businesses working with accounting service experts in Chiang Mai receive professional guidance on internal document controls, verification of director powers against commercial contracts, and proper preparation of tax filings submitted to the Revenue Department. This eliminates the risk of retrospective tax audits or rejected financial transactions caused by flawed documentation.

When starting a business or amending company directors, combining a company registration service with accounting setup ensures director signing authorities are structured for operational agility and legal precision from day one, avoiding redundant administrative burdens long term.

Analysis and Discussion: Agency Requirements Comparison and Common Misconceptions

Document inspection practices vary depending on the destination agency's regulatory framework, as outlined below:

Agency / Transaction Type Sign Every Page? Company Seal Required? Accepted Document Age Key Notes and Precautions
Commercial Banks
(Account opening, loan applications)		 Must sign every page Required (per registered authority) Within 30 days Banks strictly enforce AMLO KYC rules. Omitting a signature or seal on any single page causes instant transaction rejection.
Revenue Department
(VAT registration, tax audits)		 Must sign every page Required (per registered authority) Within 6 months [4] While Revenue Code Section 7 does not strictly mandate a seal on tax forms [5], administrative standards for corporate filings require director signatures and seals on all sheets.
Land Office
(Property sales, mortgage registrations)		 Must sign every page Required (per registered authority) Within 30 days Land registry officers rigorously compare signatures and physical seal imprints against official registration records to prevent unauthorized property transfers.
Government Procurement
(e-GP system, public bidding)		 Must sign every page Required (per registered authority) As specified in TOR (usually 30–90 days) Failure to sign or seal attached objective pages may cause procurement committees to disqualify the bid proposal for incomplete documentation.
Private Business Partners
(Vendor onboarding, agreements)		 Depends on agreement Per registered binding authority Typically 1–3 months Always write a restrictive use note to prevent partners from using corporate documents to open trade credit or conduct unapproved transactions.

Common Misconceptions About Signing an Affidavit

  • Misconception 1: "Because objective pages already carry the registrar's stamp, directors do not need to sign them."
    Fact: The registrar's seal certifies registry status under CCC Section 1020 [1]. A director's certified copy signature represents legal intent under CCC Section 1167 [2], confirming to third parties that the page is an accurate copy recognized and active for the company.
  • Misconception 2: "Any single company director can certify the document alone."
    Fact: For legally binding transactions, signing certified copies must strictly follow the current registered director authority clause. If two directors are required to sign jointly, a single director's signature renders the package non-binding.
  • Misconception 3: "A printed DBD e-Certificate file can be used indefinitely without expiration."
    Fact: While the DBD online verification system supports documents for up to 1 year [7], printing the file turns it into a paper copy. Receiving entities like financial institutions enforce a 30-day cutoff to verify that director structures or company statuses have not changed.

Case Study: Hypothetical Corporate Document Preparation for Commercial Transactions

To illustrate practical compliance, consider this hypothetical example of a construction business in Chiang Mai:

Hypothetical Company Profile: Lanna Engineering and Construction Co., Ltd. has three directors: Mr. A, Mr. B, and Ms. C. The registered director authority states: "Mr. A signs jointly with Mr. B or Ms. C, totaling two persons, and affixes the company seal."

Scenario: The company is submitting a bid for a Chiang Mai local municipal construction project valued at 2,500,000 baht. Procurement regulations require one copy set of the corporate affidavit issued within 30 days, consisting of:

  • Main corporate detail pages (name, capital, directors, authority): 2 pages
  • Attached corporate objectives (Form Bor.Or.Jor.2): 4 pages
  • Total document package: 6 pages

Document Preparation Process:

  1. Document Retrieval: Administration requests an e-Certificate via DBD e-Service, pays the 200 baht government fee [6], and prints all 6 pages on paper.
  2. Verifying Authorized Signers: Having Mr. B sign jointly with Ms. C would render the documents void, because the registered authority mandates Mr. A as the primary signatory together with one other director. Eligible signing pairs are Mr. A with Mr. B, or Mr. A with Ms. C [2].
  3. Signing and Sealing:
    • Mr. A and Mr. B write: "Certified true copy, used exclusively for bidding on Chiang Mai Municipality project tender" with the current date across all 6 pages.
    • Both directors sign side-by-side on every page (totaling 12 signatures across 6 sheets).
    • The red official company seal is stamped overlapping the director signatures on all 6 sheets.

Outcome: The package meets CCC Section 1167 and government procurement requirements, allowing the technical proposal to pass scrutiny without issue. For businesses using an accounting service in Chiang Mai, having professionals verify corporate documents before bidding prevents disqualification due to administrative mistakes.

Practical Recommendations for Business Owners

To avoid document certification errors, management should establish clear internal protocols:

  1. Create a Signatory Authority Matrix: Prepare a summary of director signing powers along with official seal samples for administrative, accounting, and procurement teams to verify before presenting documents to directors.
  2. Order Custom Restrictive Rubber Stamps: Create rubber stamps with text like "Certified true copy, used exclusively for ........... Date ...../...../....." to ensure standardized conditions and prevent missed dates.
  3. Never Sign or Stamp Blank Paper: Enforce strict security policies prohibiting directors from signing or stamping blank paper before content or purposes are printed, preventing potential fraud.
  4. Systematize Digital File Storage: Archive original e-Certificate PDF files on a secure cloud or server organized by issuance date, and shred printed draft copies to protect corporate privacy.
  5. Confirm Destination Requirements Early: Always ask the receiving officer in advance about acceptable document age and required schedules to prepare everything accurately in a single round.

Frequently Asked Questions

Does a company affidavit need to be certified on every page, or is the first page enough?

In practice, every page must be signed and stamped with the company seal. Signing only the first page is routinely rejected by external organizations. Although the Civil and Commercial Code does not mandate it, destination institutions—such as commercial banks, the Revenue Department, and government procurement offices—enforce security rules requiring certifications across all sheets, including attached objectives, to prevent page substitution.

Who is authorized to sign a company affidavit? Can a single director sign alone?

A single director can sign only if the affidavit's director authority clause explicitly permits one director to bind the company alone [2]. If the affidavit mandates joint signatures by two directors or names specific individuals, a single signature or an unauthorized director's signature invalidates the document's legal binding power.

Do objective pages attached to the affidavit need to be signed if they already bear the registrar's stamp?

Yes, authorized directors must sign and affix the registered seal on every objective page. The registrar's stamp confirms official DBD database authenticity [1], while director signatures confirm that the copy is recognized and actively used by the corporate entity under CCC Section 1167 [2]. Missing signatures will cause receiving agencies to reject the schedule.

How should a digital DBD e-Certificate be certified if forwarded as a PDF file?

When transmitting the original PDF file with the registrar's digital signature via digital channels, no additional manual signature is required, as it is fully valid under Section 7 of the Electronic Transactions Act B.E. 2544 (2001) [3]. However, once printed onto physical paper, it becomes a copy, requiring authorized directors to sign in wet ink and affix the company seal on every page.

What wording should be written on a certified copy of an affidavit to prevent fraud?

Draw two parallel lines across a blank area of the document, write "Certified true copy," and state the exact purpose and date, such as: "Used exclusively for opening a current account with Bangkok Bank, Nimmanhemin Branch, on 13 November 2026." Overlap part of the handwriting onto document text to safeguard against digital clipping.

Conclusion

While Section 1020 of the Civil and Commercial Code establishes that a corporate affidavit is an inherently authentic public document [1], complying with agency security protocols by signing certified true copies and stamping the company seal on every page represents the proven best practice to avoid delays. Directors and administrative staff must review registered signatory authorities under CCC Section 1167 carefully [2], always specifying the restricted purpose and date to protect the legal security of the juristic person.

References

  1. Office of the Council of State. (1925). Civil and Commercial Code, Section 1020.
  2. Office of the Council of State. (1925). Civil and Commercial Code, Section 1167.
  3. Office of the Council of State. (2001). Electronic Transactions Act B.E. 2544 (and amendments), Section 7. Royal Gazette.
  4. Revenue Department. (2026). Guidelines on corporate evidentiary documents for official contact. Electronic Service Channels and Juristic Person Document Submission, Revenue Department
  5. Revenue Department. (1997). Revenue Department Ruling No. Kor Khor 0811/Por.15207 regarding signing tax return forms under Section 7 of the Revenue Code. Revenue Department Rulings and Revenue Code Section 7
  6. Department of Business Development. (2026). Electronic certificate service and copy certification system (DBD e-Service) and user manual. Electronic Juristic Person Certificate and Document Copy Service (DBD e-Service), Department of Business Development
  7. Department of Business Development. (2026). Juristic person certificate and document verification system (e-Service Inquiry). Juristic Person Certificate and Document Verification System (e-Service Inquiry), Department of Business Development

If you have questions regarding corporate document preparation, tax planning, or setting up compliant accounting systems, you can consult our specialist team directly. Contact YMTD Accounting Partner Chiang Mai at Tel. 081-542-3019 / LINE: @premwittawat

Note: This article provides general educational information based on laws and regulations in force as of 13 November 2026, which may change. Specific business circumstances vary; please consult a qualified professional before making business decisions.