What Thai BOI Advisory Firms Should Cover: 2026 Checklist

What End-to-End BOI Support Should Cover: A Practical Scope for Foreign Investors (2026)

Quick answer

End-to-end BOI support covers six stages: (1) eligibility and incentive strategy, (2) company structure and registration, (3) BOI application filing and interview, (4) certificate activation, including machinery lists and foreign staff approvals in e-Expert, (5) implementation-phase reporting and milestones, and (6) ongoing compliance, including the annual operating report and separate accounting.

Thai BOI advisory firms that only file the application leave investors exposed at the stages where most incentives are actually lost.

Most foreign investors judge Thai BOI advisory firms on one question: can they get the promotion certificate approved? That is the wrong test. The certificate is the midpoint of a BOI project, not the finish line. The real value, including corporate income tax holidays, duty-free machinery, foreign ownership rights and easier work permits, only holds if every stage after approval is handled correctly.

In 2026 the stakes are higher. The BOI refreshed its investment promotion measures in January 2026, switched implementation-phase projects to quarterly progress reporting from 30 March 2026, and is reshaping incentives for large multinationals under the OECD global minimum tax. This guide sets out what end-to-end BOI support should cover, stage by stage, so you can compare advisors on scope instead of promises.

What does "End-to-End BOI support" mean?

End-to-end BOI support is advisory coverage that runs from the first question (does my project qualify, and which incentive route fits best?) through application filing and certificate activation, to the ongoing reporting and compliance that keep your privileges valid for the full promotion period.

It combines three skill sets that are often split across different providers: investment strategy, government filings, and day-to-day corporate compliance such as accounting, tax, visas and work permits. When your BOI consultant, accountant and visa agent are three separate firms, the gaps between them are where problems start: a machinery list that does not match import records, accounts that mix promoted and non-promoted income, or a foreign manager whose position was never approved in e-Expert.

The 6 stages of End-to-End BOI support

Stage	What your advisor should do	Deliverable
1. Strategy	Match your activity to the right BOI category; compare BOI with non-BOI routes; check global minimum tax exposure	Incentive strategy and go/no-go advice
2. Structure	Plan shareholding, capital and timing; register the company; arrange a Foreign Business Certificate if required	Company ready to apply or operate
3. Application	Prepare and file the application; prepare you for the BOI interview; answer BOI queries	BOI approval
4. Activation	Accept promotion; set up machinery and raw-material lists; approve foreign positions in e-Expert; process visas and work permits	Promotion certificate in active use
5. Implementation	File quarterly progress reports; track machinery import and start-up deadlines; request full-operation approval	Full operation approved on time
6. Ongoing compliance	File annual operating reports; keep separate BOI accounts; request approval for changes	Privileges kept for the full term

Stage 1: Eligibility and incentive strategy

Good BOI incentive applications start with the correct activity category. BOI incentives are activity-based, with extra merit-based and area-based add-ons. Choosing the wrong activity code can mean weaker incentives or an outright rejection.

A strong advisor will also tell you when BOI is not the best route. For some service or trading businesses, a Foreign Business License, the US Treaty of Amity or a standard Thai company structure may be simpler, cheaper and carry fewer conditions.

For multinational groups with consolidated revenue of EUR 750 million or more, strategy must now include the global minimum tax. Under Thailand’s top-up tax rules, a tax holiday may be partly offset by top-up tax, so ask whether the BOI’s new Qualified Refundable Tax Credit (QRTC) or other measures fit your project better.

Stage 2: Company structure and registration

Your structure should match your BOI plan from day one. That means shareholding, registered capital, directors, and a realistic investment budget. Most BOI activities require a minimum investment of THB 1 million, excluding land and working capital, and some activities set higher thresholds.

Timing matters too. You can apply before or after incorporating, and the right order depends on your project. Where a foreign-majority company will run a restricted activity under BOI promotion, it also needs a Foreign Business Certificate.

Stage 3: Application filing and the BOI interview

The application is filed through the BOI’s online system and covers the project description, production or service process, investment budget, financial projections and employment plan. Most projects also go through a meeting with a BOI officer, and weak answers here cause delays.

Once the application is complete, the BOI’s decision window is 40 working days for projects up to THB 200 million, 60 working days above that, and 90 working days for projects over THB 2 billion. Realistically, allow extra time for document preparation and follow-up questions.

Stage 4: Certificate activation

Approval is not the same as being ready to operate. After approval, your advisor should:

Accept the promotion and request the certificate within the deadlines in the approval letter
Register machinery and raw-material master lists so duty exemptions can actually be used
Register the company in e-Expert, get each foreign position approved, then process visas and work permits through the One Stop Service Center
Set up accounting that separates promoted and non-promoted revenue from the first transaction

Stage 5: Implementation-phase compliance

This is where BOI compliance services earn their fee. Since 30 March 2026, companies that have not yet received full-operation approval must file progress reports every quarter through the BOI e-Monitoring system, within 60 days after each quarter ends (BOI Announcement No. 8/2569). Before this, reports were due only twice a year.

Deadlines also apply. Machinery import rights generally run for 30 months from the certificate date, and you must apply for full-operation approval within 36 months. Extensions are possible, but only if requested on time.

Stage 6: Ongoing compliance for the full promotion period

After start-up, every promoted company files an annual operating report through e-Monitoring by 31 July. It must also keep separate accounts for promoted activities, claim tax exemptions correctly, and get BOI permission before major changes, such as selling or transferring duty-free machinery or pausing operations for more than two months.

Why this matters

Weak compliance can trigger retroactive import duties, recalculated tax exemptions, delayed work permits for foreign staff and, in serious cases, revocation of BOI promotion.

Filing-only vs end-to-end BOI support

Service	Filing-only advisor	End-to-end advisor
Incentive strategy and BOI vs non-BOI comparison	Limited	Included
Global minimum tax (Pillar Two) check	Rarely	Included where relevant
Company registration	Separate provider	Included
Application and BOI interview preparation	Included	Included
e-Expert, visas and work permits	Separate provider	Included
Quarterly and annual e-Monitoring reports	Not included	Included
BOI-compliant accounting and tax filing	Separate provider	Included
Change requests and BOI approvals	Billed ad hoc	Included or planned

7 questions to ask Thai BOI advisory firms before you sign

Use these questions to compare Thailand investment promotion advisors on scope, not sales promises:

Have you compared BOI with non-BOI routes for my specific business?

Will you prepare me for the BOI presentation for me?

Who handles e-Expert, visas and work permits after approval?

Is BOI-compliant accounting done in-house, or do I need another firm?

Who files the quarterly and annual e-Monitoring reports, and who tracks the deadlines?

What is included in the fee, and what is billed separately?

Who is my single point of contact after approval?

Costly mistakes that quietly destroy BOI benefits

Wrong activity code. It limits incentives and is hard to fix later.
Treating the certificate as the finish line. Most problems start after approval.
Mixed accounts. Promoted and non-promoted income in one ledger puts tax exemptions at risk.
Moving duty-free machinery without approval. This can trigger back-duties.
Missed reporting deadlines. Quarterly reporting leaves little room for error.
Hiring before position approval. Foreign staff can be delayed if e-Expert positions are not approved first.

How Act & Align delivers End-to-End BOI support

Act & Align Advisor Co., Ltd. is a Thai-owned business advisory firm in Thong Lo, Bangkok, providing foreign investor assistance across the full BOI lifecycle: incentive strategy, company registration, BOI application filing, visas and work permits, and the accounting and reporting that keep promotion valid.

Because registration, BOI, accounting and immigration work sit under one roof, there are no handover gaps between providers. Our founders bring hands-on experience from more than 100 company registrations for clients of 15+ nationalities. Our approach is simple: We Listen, Think, Advise & Take Action.

Planning a BOI project in Thailand? Book a consultation with our BOI advisory team for a clear scope, timeline and fee before you commit.

Frequently Asked Questions

What do Thai BOI advisory firms do?

They help foreign and Thai companies qualify for BOI investment promotion. Full-service firms cover strategy, application filing, certificate activation, foreign staff approvals and ongoing BOI reporting and accounting.

How long does BOI approval take?

The BOI aims to decide within 40, 60 or 90 working days after a complete application, depending on project size. However, from our experience, its normally takes 4-9 months

How many times per year must a BOI-promoted company report to the BOI?

Four times a year, through the BOI e-Monitoring system, until the BOI approves full operation. Each report is due within 60 days after the quarter ends. All promoted companies also file one annual report by 31 July.

Is BOI promotion worth it for a smaller foreign company?

Yes. BOI isn't only for big companies. Most activities need a minimum investment of just THB 1 million, excluding land and working capital. Many SMEs qualify, and Act & Align has helped SME clients get BOI approval. The key is choosing the right activity category from the start.