The Thailand Board of Investment (BOI) is the single biggest reason foreign manufacturers move production to Thailand instead of Vietnam or Malaysia. For qualifying projects, BOI grants up to 13 years corporate tax exemption, 100% foreign ownership, duty-free imports of machinery, and work-permit fast-tracks for foreign engineers and executives.
This guide breaks down what BOI actually offers in 2026, who qualifies, and how to apply — written for foreign procurement, supply chain, and operations leaders evaluating Thailand as a manufacturing base.
What BOI Is (and Isn't)
BOI is Thailand's central investment promotion agency, established in 1966 and reporting directly to the Prime Minister. It is not a tax authority and it is not a regulator — it is a one-stop incentive office that issues "promotion certificates" granting qualifying projects a package of benefits.
| Benefit | What You Get |
|---|---|
| Corporate Income Tax Exemption | Up to 13 years (group A1+) |
| Import Duty Exemption | Machinery + raw materials for export |
| 100% Foreign Ownership | Bypass the Foreign Business Act |
| Land Ownership | Permission to own land for promoted activity |
| Visa & Work Permit Fast Track | One-Stop Service Center, 3-hour processing |
| Withholding Tax | Reduced or exempt on dividends in promotion period |
2026 Incentive Categories
BOI restructured its incentive map in 2023, sharpened it again in 2025, and the current framework rewards advanced manufacturing, digital, and BCG (Bio-Circular-Green) activities heavily.
Group A1+ (Maximum: 10-13 years CIT exemption)
- Semiconductor wafer fabrication
- EV battery cell manufacturing
- Advanced biotech, vaccines, medical devices Class III
Group A1 (8 years CIT exemption, no cap)
- Wafer assembly & test, advanced PCB
- EV powertrain, motor, BMS
- Aircraft parts manufacturing, MRO
Group A2 (8 years CIT, capped at investment)
- Automotive parts (Tier 1 to OEMs)
- Industrial machinery, robotics, automation
- Specialty chemicals, advanced polymers
Group A3 (5 years CIT)
- Standard automotive components
- Food processing for export, animal feed
- Plastics, metals processing
Group A4 / B (3 years CIT or duty only)
- Lower-tech assembly, distribution centers, IBC/ITC
Who Qualifies — and Who Doesn't
You qualify if:
- Minimum capital investment of THB 1M (excluding land and working capital)
- Debt-to-equity ratio ≤ 3:1
- Modern machinery (≤10 years old, or new)
- Value added ≥ 20% of revenue
- ISO 9001 within 2 years of operation
You won't qualify if: the activity is on the BOI exclusion list (basic trading, simple repackaging, retail, real-estate brokerage, raw resource extraction without processing).
Geographic Add-Ons (Stack These)
BOI grants extra incentives for locating in priority zones:
- EEC (Eastern Economic Corridor) — Chonburi, Rayong, Chachoengsao: additional 50% CIT reduction for 5 years after the base period ends
- 20 Targeted Provinces (Northeast, Deep South): additional 3 years CIT
- Science & Industrial Parks: 1 additional year CIT + reduced land lease
For EV battery in Rayong (EEC), this can stack to 13 years full CIT exemption + 5 years at 50% = effective 15.5-year tax holiday equivalent.
Application Process (Realistic Timeline)
- Pre-consultation with BOI investor services — free, 1-2 weeks
- Application submission — online via BOI e-Investment platform
- Board review — 40-90 working days depending on project size
- Promotion certificate issued — valid for 2 years to start operations
- Operating license — once production begins
Realistic end-to-end: 4-6 months from first meeting to promotion certificate for a standard A2/A3 project. EV and semiconductor projects with capital >THB 1B get fast-tracked to 60 days.
Hidden Costs Foreign Investors Underestimate
BOI itself is free. The hidden costs are:
- BOI consultant fees: THB 300K-1.5M for a typical industrial project (you don't legally need one, but most foreign investors use one)
- Annual compliance: BOI requires annual reporting; non-compliance can revoke benefits retroactively
- Land: BOI permission to own land does not lower land prices — industrial estate land in EEC runs THB 6-12M per rai (1,600 m²)
- Local content rules: Some categories require minimum Thai workforce ratios within 2 years
BOI vs Non-BOI: 5-Year Cost Comparison
For a
0M USD annual revenue Thai manufacturing operation producing automotive components:| Cost Item | Non-BOI (THB) | BOI A2 (THB) | Savings |
|---|---|---|---|
| Corporate Income Tax (5y) | 30,000,000 | 0 | 30,000,000 |
| Import Duty on Machinery | 8,000,000 | 0 | 8,000,000 |
| Withholding on Dividends (5y) | 2,500,000 | 1,250,000 | 1,250,000 |
| Foreign Ownership Workaround | 1,200,000 | 0 | 1,200,000 |
| 5-Year Total Savings | 40,450,000 (~.13M USD) |
For most foreign manufacturers, BOI changes the unit economics of Thailand sourcing by 5-12% over a 5-year horizon — often the difference between Thailand and Vietnam pencilling out on identical product.
When to Skip BOI
BOI is not always worth it. Skip it if:
- Your investment is <THB 5M and you don't need foreign ownership
- You're a pure trading / distribution operation
- Your operation is short-term (<3 years)
- You can't meet the value-add requirement
In those cases, an IBC (International Business Center) or pure FBA license route is faster and cheaper.
Frequently Asked Questions
Can a foreign company own 100% of a BOI-promoted entity?
Yes. BOI promotion overrides the Foreign Business Act's 49% foreign ownership ceiling. This is one of the largest non-tax benefits — foreign investors don't need a Thai nominee shareholder.
Does BOI cover VAT?
No. BOI does not exempt VAT (7%). VAT is recoverable through normal tax filing on exports. BOI covers Corporate Income Tax and import duty, not VAT.
Can I apply for BOI after I've already started operations in Thailand?
No. BOI promotion must be granted before machinery is imported and operations begin. Retroactive promotion is not available. This is the most common mistake first-time investors make.
How long does BOI promotion last?
The promotion certificate is valid for 2 years to start machinery installation and 3 years to begin operations. Once operations begin, the tax-exemption clock starts and runs for 3-13 years depending on category.
Is BOI promotion transferable if I sell the company?
The promotion stays with the legal entity, not the shareholders. A share sale preserves BOI benefits. An asset sale to a different entity loses them.
Do I need a Thai partner for BOI?
No. 100% foreign ownership is allowed under BOI promotion for almost all manufacturing categories. A Thai partner is required only for certain restricted activities (logistics, some services).
What happens if I miss the BOI value-added or ISO compliance requirements?
BOI can suspend or revoke benefits. In practice they issue warnings first, but revocation triggers retroactive tax liability — meaning all the CIT you didn't pay becomes payable with interest.
TUSKO advises foreign manufacturers through BOI application, factory site selection in the EEC, and verified supplier introductions for Thailand-based production.
→ Talk to our team at tuskoconsulting.com