BOI Approval Timeline: How Long Each Step Takes — and What Comes After (2026)

This guide runs the clock through the whole journey. For what goes into the application — eligible activities, incentives, and how to prepare the project plan — see our companion guide to the BOI promotion application; this article is about how long each step takes and what you owe the BOI after the certificate arrives.

How long does each application stage take?

Two honest caveats the official windows hide. First, the review clock runs on a complete application — every document round the officer requests pauses your real-world calendar even if not the official one. Second, the durations above are BOI service standards, not guarantees; complex projects, restricted activities and foreign-ownership questions add time.

Does project size change the timeline?

Yes — the substantive review window is tiered by investment value (excluding land and working capital):

Working days, not calendar days: a 60-working-day review is roughly three calendar months, before adding the stages either side of it.

What must you do in the first six months after approval?

Approval starts a sequence of deadlines, each with a consequence:

A practical sequencing note: if the promoted company does not exist yet, start incorporation immediately after acceptance — bank account opening, capital remittance and DBD registration comfortably consume the window if left late.

What are the ongoing reporting obligations — and what changed in 2026?

This is the part most guides skip, and the part that gets promotions suspended.

• Quarterly progress reports (new in 2026). Under Office Notification Por. 8/2569, promoted companies that have not yet reached full operation report project progress every quarter, within 30 days of the quarter-end, through the BOI's e-Monitoring system, from certificate issuance until the operating licence is granted. The deadline was 60 days when quarterly reporting was introduced in April 2026, and most published guides still print that figure; 30 days has been the rule since 20 May 2026. Non-filing can suspend the use of incentives, and missing two consecutive periods exposes the promotion to revocation. If your compliance calendar was built before April 2026 around the old twice-yearly reporting cycle, it is out of date.
• Annual operations report. Every promoted company files an annual performance report (traditionally due by 31 July) through the BOI's reporting system.
• Project audit. The BOI reviews whether the project was implemented as promised — machinery installed, capacity reached, conditions met — around the completion of the implementation period, before confirming full operation.
• Visa and work permit compliance. Foreign experts and executives brought in under BOI privileges are managed through the BOI's Single Window for Visa and Work Permit, the system that replaced e-Expert, with positions and headcounts that must match what was approved. The people privileges become usable once the promotion is in place — positions are approved in Single Window first, and the visas and work permits are then processed through the Thailand Investment and Expat Services Center (TIESC), typically in days rather than the weeks a standard work permit takes.
• Changing the project later. Capacity, location, scope, capital and shareholding are all conditions of the promotion — changing any of them requires a project amendment approved by the BOI before the change is made, not regularised after it.
• Condition-specific reports. Individual approval letters carry their own conditions — Thai shareholding levels, technology transfer, training plans — each of which is checkable and checked.

What deadlines apply to machinery and starting operations?

Two long-horizon deadlines shape the implementation phase:

• Machinery import: within 30 months of the certificate (for projects using the machinery import duty exemption), with the machinery list approved through the BOI's systems.
• Full operation / project implementation: within 36 months, meaning construction complete, machinery installed and the promoted activity actually operating.

Both are extendable on application with reasons — but extensions are requested before the deadline, not explained after it.

What happens if you miss a deadline — and can you extend?

The BOI's toolkit runs from mild to terminal: a warning or a request for clarification; suspension of the right to use incentives (duty exemptions stop working at customs); and withdrawal (revocation) of the promotion — which can include retroactive collection of the duties and taxes already exempted, because a revoked promotion is treated as if the privileges should not have been used.

The practical rules: diarise every deadline the day the certificate arrives; file the quarterly report even when nothing happened in the quarter (a "no progress" report filed on time is compliance; silence is not); and request extensions early with documented reasons — the BOI grants reasonable, well-founded extensions routinely, and almost never sympathises retroactively.

How long until the incentives actually work?

A question we hear from CFOs: the corporate income tax holiday runs from the date the promoted activity first earns revenue, not from the certificate date — so a slow implementation does not burn your tax holiday, but the machinery import window and implementation deadlines run from the certificate regardless. Plan the two clocks together: importing machinery in month 28 of 30 while revenue starts in month 20 wastes nothing, but the reverse sequencing can.

Two more mechanics worth planning around: for most incentive categories the total CIT exempted is capped by reference to the project's investment value (excluding land and working capital), and promoted revenue must be accounted for separately from any non-promoted business — the holiday only ever shelters the promoted activity.

This article is general guidance — not legal or tax advice. If you'd like a scoped opinion on how it applies to your specific situation, contact our team.