Thailand BOI Application Requirements & Process — Investment Threshold, Paid-Up Capital, and the 6-Step Procedure

One-sentence answer

The standard minimum investment threshold for a Thailand BOI application is 1 million THB (approx. RMB 280,000 / USD 40,000), excluding land acquisition and working capital; certain Activities qualify for a reduced threshold of 500,000 THB; the full cycle from application submission to issuance of the Promotion Certificate typically takes 60–90 business days for straightforward projects, or 4–6 months for complex ones — structured across six defined procedural steps. Full paid-up capital is not required at application; however, post-Certificate, investors must adhere to strict statutory timelines: initial paid-up capital ≥25%, with full payment due within 6 or 12 months, depending on project scope.

📋 Legal review notes: ① Confirmation of the updated 1 million THB threshold under the 2024+ BOI regulatory revisions; ② Consistent use of “Promotion Certificate” as the official English term; ③ Statutory deadline for appeal; ④ Legal basis for paid-up capital timelines.

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1. Minimum Investment Threshold — Varies by Activity Classification

The concept of “minimum investment” under the BOI framework is frequently misunderstood. Three critical points clarify its scope:

(a) Standard Threshold: 1 Million THB — But Exclusions Matter

Per the Investment Promotion Act, the general minimum investment threshold is 1 million THB (excluding land acquisition and working capital). Here, “investment” refers specifically to:

• Construction or renovation of factory premises
• Core production or service equipment
• Acquisition of software or intellectual property assets
• First-year technology licensing fees

Excluded from the calculation:

• Land purchase price (filed separately)
• Working capital (e.g., accounts payable, inventory, salaries)
• Marketing and promotional expenses

(b) Reduced Threshold for Knowledge-Intensive Activities

Certain high-knowledge, low-asset Activities benefit from a lower threshold of 500,000 THB (or even less), reflecting their emphasis on technical capability over physical infrastructure:

• Software development (Activity 5.7)
• IT services and embedded systems design
• Selected R&D services
• Certain creative industry subcategories

📋 Legal verification: Confirm whether the 500,000 THB eligibility list remains unchanged since the 2020s, and whether any updates were introduced in 2024+.

(c) Elevated Thresholds for Strategic Sectors

Top-tier A1+ priority sectors—including advanced semiconductor manufacturing, biopharmaceutical GMP facilities, and new-energy technologies—require significantly higher thresholds: 50 million THB or more, sometimes reaching hundreds of millions THB, depending on scale and technology level.

Practical recommendation: Do not rely on assumptions. Begin with the BOI Self-Check Tool to determine your Activity’s precise applicable threshold.

2. Distinguishing Three Key Capital Concepts — Registered Capital vs. Paid-Up Capital vs. BOI Investment Amount

Conflating these three concepts is one of the most common causes of BOI application rejection:

Concept	Legal Basis	Timing	Amount	Purpose
Registered Capital	Department of Business Development (DBD) registration	At company incorporation	≥ BOI investment amount	Formal commercial registration with DBD
Paid-Up Capital	Civil and Commercial Code	At incorporation / then within 6 or 12 months post-Certificate	Minimum 25% initially; balance to reach 100%	Actual funds deposited into the company bank account
BOI Investment Amount	Investment Promotion Act + Project Proposal	Within 36 months of Certificate issuance	As declared in the approved Project Proposal	Eligible expenditures for promoted activities only

Typical timeline:

• T₀ (Pre-application): Finalize Project Proposal and define BOI investment amount (e.g., 50 million THB)
• T₀+60–90 business days: Receive Promotion Certificate
• T₁ (Immediately post-Certificate): Incorporate company; registered capital ≥ BOI investment amount (e.g., 50 million THB); initial paid-up capital ≥25% (e.g., 12.5 million THB)
• T₁+12 months: Complete full paid-up capital (100%)
• T₁+6 months: Commence investment (e.g., construction start, equipment import, hiring)
• T₁+36 months: Fulfill total BOI investment commitment and submit implementation report

📋 Legal verification: Confirm current legal basis for the 25% minimum paid-up requirement (e.g., Civil and Commercial Code Section 1108, as amended).

3. The 6-Step BOI Application Process (End-to-End)

Step 1 — Activity Self-Check & Preliminary Eligibility Assessment

Tool access: BOI Self-Check

Confirm that your Activity appears on the BOI’s List of Promoted Activities and identify its likely promotion category (A1+ through B). This is the most critical step — errors here invalidate all subsequent efforts.

Step 2 — Submission of Project Proposal via eBOI System

The Project Proposal is the core technical and financial document of the BOI application — typically 50–200 pages, structured across 12 mandatory chapters:

1. Company Profile (legal entity, shareholding structure, related parties)
2. Project Overview (Activity classification, scale, implementation timeline)
3. Market Analysis (target customers, distribution channels, export strategy)
4. Technical Plan (production process flow, equipment list, technology source)
5. R&D Plan (if applying for R&D-related incentives)
6. Environmental Impact Assessment (if applying for BCG-related incentives)
7. Human Resources Plan (number of employees, foreign staff, training programs)
8. Financial Projections (5-year P&L, cash flow, ROI analysis)
9. Investment Breakdown (land, buildings, machinery, software, IP)
10. Implementation Timeline (commencement, trial production, full operation)
11. Imported Equipment & Raw Materials List (for customs duty exemption applications)
12. Annexes (MOA/AOA, shareholder KYC documents, technology license agreements, land title deeds, etc.)

📋 Legal verification: Confirm whether the 12-chapter structure remains current (2020s baseline), and whether ESG or data compliance sections have been added in 2024+.

Submission method: Electronic filing via the eBOI portal + simultaneous hard-copy submission to BOI Headquarters (Bangkok).

Step 3 — Preliminary Review by BOI Secretariat

Completed within 5–10 business days, this review assesses:

• Completeness of submitted documentation
• Correctness of Activity classification
• Compliance of declared investment amount with minimum thresholds for the selected category
• Alignment between applicant’s financial capacity and declared investment amount

If preliminary review fails → application is returned for correction (resubmission permitted within 30 days).

Step 4 — BOI Interview

This is the single most decisive stage of the application. Format details:

• Venue: BOI Headquarters (Bangkok), occasionally supplemented by site visits
• Language: English or Thai (interpreters permitted, but interpreter competence directly affects evaluation score)
• Duration: 1–3 hours (single session)
• Attendees: Legal representative (mandatory in person) + Technical Lead + Finance Lead + (optional) Legal Counsel or Advisor
• Focus areas: Project feasibility, technical depth, financial credibility, export commitments, evidence supporting incentive add-ons

Common interview questions:

1. Why is this activity not being undertaken in China/Vietnam/Indonesia?
2. What specific line items constitute your declared X% R&D expenditure?
3. Which customers support your Year 3 export target of 60%? Please provide names.
4. Is core technology proprietary or licensed? If licensed, please identify licensor and terms.
5. What is the documented source of funds for your initial 25% paid-up capital?
6. Which EEC industrial estate has been selected for physical implementation?

Role of legal counsel/advisors: Pre-interview simulation + real-time support on regulatory/compliance questions during the session (e.g., SiaThailand Legal offers this service).

Step 5 — BOI Board Approval

Upon successful preliminary review and interview, the application proceeds to formal Board deliberation. Total processing time: 60–90 business days (counted from Step 2 submission date).

Possible Board decisions include:

• Approval (full grant of requested promotion category and all incentive add-ons) → Proceed to Step 6
• Conditional approval (e.g., downgrade from A1 to A2, or removal of certain add-ons) → Applicant may accept or file an appeal
• Request for correction (30-day window to resubmit)
• Rejection → Applicant may file a formal appeal within 30 days; if appeal fails, reapplication for the same Activity is prohibited for one year

📋 Legal verification: Confirm statutory appeal deadline (currently 30 days) and cooling-off period (1 year) under applicable law.

Step 6 — Issuance of Promotion Certificate

Upon approval, BOI issues the Promotion Certificate — the legally binding instrument conferring all BOI privileges. From this moment:

• ✅ Full foreign ownership eligibility (see Foreign Ownership & Land Rights)
• ✅ Commencement of CIT exemption clock (Note: CIT exemption timing generally starts from the first revenue-generating day, not the Certificate issuance date)
• ✅ Right to apply for customs duty exemption on imported machinery (per shipment)
• ✅ Right to apply for land acquisition (where permitted)
• ⏰ Obligation to commence investment within 6 months, and submit first implementation report within 12 months (see Implementation Timeline & Revocation)

4. The 12 Required Chapters of the Project Proposal (See Step 2 Above)

(Refer to Step 2 section.)

5. Common Interview Questions and Preparation Guidance

(Refer to Step 4 section.)

6. Top 5 Reasons for Application Rejection + Appeal Mechanism

Top 5 Rejection Causes

1. Incorrect Activity classification — Applying under an ineligible Activity code (~30% of rejections)
2. Inconsistent investment figures — Declaring 50 million THB while parent company’s audited net assets show only 20 million THB (raising financing credibility concerns)
3. Insufficient R&D evidence — Claiming R&D incentives without proof of dedicated team, lab infrastructure, or prior patents
4. Unclear technology provenance — Failing to submit valid licensing agreements or verifiable proprietary IP documentation
5. KYC failure — Shareholders or related parties linked to sanctions lists, AML red flags, or other regulatory non-compliance

Appeal Mechanism

• Deadline: Must be filed within 30 days of official notification of the Board’s decision
• Format: Written submission + supplemental evidence
• Outcome: Decision may be upheld (final) or remanded for re-evaluation by the Board
• Post-appeal restriction: No reapplication for the same Activity within one year
• Alternative pathways: Switch to another eligible Activity, restructure equity, pursue IBC status, or invoke the Treaty of Amity

📋 Legal verification: Confirm whether the 1-year cooling-off period remains codified under current 2020s regulations.

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FAQ (Structured for Schema.org FAQPage)

Q1: What is the minimum investment amount required for a BOI application?
A: The standard threshold is 1 million THB, excluding land and working capital. Knowledge-intensive Activities such as software development qualify for a reduced threshold of 500,000 THB. For strategic A1+ sectors — including semiconductors and biopharmaceuticals — thresholds begin at 50 million THB, often scaling into hundreds of millions.

Q2: Is registered capital the same as the BOI investment amount?
A: No. Registered capital is the figure filed with the DBD for corporate registration. The BOI investment amount is the sum declared in the Project Proposal for eligible promoted activities. Registered capital must be ≥ BOI investment amount, per standard practice.

Q3: How long does the BOI application take?
A: 60–90 business days for straightforward projects (from Project Proposal submission). For complex cases — involving land acquisition, multiple Activities, or layered incentive add-ons — expect 4–6 months.

Q4: Is 100% paid-up capital required at application?
A: No. At incorporation, ≥25% paid-up capital suffices. The remainder must be fully paid within stipulated timelines — typically 6 or 12 months — as specified in the Promotion Certificate’s annexes.

Q5: How soon can I reapply if my application is rejected?
A: Following an unsuccessful appeal, reapplication for the same Activity is prohibited for one year. Alternatives include selecting a different Activity, restructuring equity, pursuing IBC status, or leveraging the Treaty of Amity.

Q6: How do I draft a Project Proposal?
A: Follow the 12-chapter structure outlined in Section 3, Step 2. Critical success factors include accurate Activity classification, realistic financial modeling, robust R&D evidence (if claimed), and export commitments backed by verifiable customer lists. Engaging a BOI-specialized law firm or advisor is strongly recommended (e.g., SiaThailand Legal).

Q7: Is the BOI interview conducted in English or Thai?
A: Either English or Thai is acceptable. Interpreters may accompany applicants, but interpreter proficiency directly influences evaluators’ perception. Best practice: Technical lead fluent in English; finance lead supported by Thai interpreter. Pre-interview simulation is highly advised.

Q8: Is a local agent legally required?
A: No statutory requirement exists — self-filing is legally permissible. However, in practice: ① Regulatory compliance in documentation is highly nuanced; ② Interview preparation demands up-to-date BOI policy insight; ③ Appeals require substantive legal expertise. We strongly recommend engaging a BOI-experienced local law firm — SiaThailand Legal, our platform’s legal review and practice partner, provides end-to-end representation.

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Recommended Internal Links

• Primary entry point: /tool/boi-self-check (direct jump for Step 1 self-assessment)
• Downstream: /article/boi-implementation-timeline (post-Certificate implementation deadlines)
• Cross-reference: /article/boi-foreign-ownership-land-rights (detailed explanation of Promotion Certificate benefits)
• Trust signal: SiaThailand Legal link at article conclusion (our platform’s legal review and practice team)

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title: Thailand BOI Application Requirements & Process · Starting at 1 Million THB · 6-Step End-to-End Guide · SiamDiSai
description: Minimum BOI investment (1 million THB; 500,000 THB for software), distinction among registered capital, paid-up capital, and BOI investment amount, 12-chapter Project Proposal structure, BOI interview preparation, and appeal mechanism — all explained. Receive your Promotion Certificate in 60–90 business days.
og:title: BOI Application: 6-Step Process · Investment Thresholds · Paid-Up Capital Timelines
og:description: 12-chapter Project Proposal · BOI Interview Prep · Top 5 Rejection Reasons · Appeal Framework · Promotion Certificate Issuance in 60–90 Business Days
keywords: BOI application, BOI investment amount, Project Proposal, BOI interview, Promotion Certificate, paid-up capital, 1 million THB