中税泰国CTAC Thailand
Toolkit · BOI incentives

BOI obligations after certification: a 36-month timeline

In short

Getting the certificate is not the finish line. It is the start of five obligations running in parallel: three countdowns — the duty-free window for importing machinery, progress toward first revenue, and the 36-month deadline for construction and the start-of-operations inspection — plus two reporting duties, one quarterly and one annual. They all start from the same date but go through different approval routes, so you cannot deal with them in a single application.

01Why they belong on one timeline

What we see is that almost no company sets out to breach its certificate conditions. The usual path to trouble runs like this: the team that handled the application breaks up, the certificate goes into a filing cabinet, and the conditions attached to it never become anyone's routine work. Two years later the business shifts and staff turn over, and nobody goes back to check the company against the certificate. By the time the annual report raises questions, three or four items are already out of line.

The job of this timeline is to turn one certificate into one table that has dates and named owners, kept somewhere management can see it rather than in a drawer in the finance office.

02What is on the timeline

Four groups of items sit on the timeline.

03Being late costs more than a fine

A late or missed report reaches into your duty-free import rights. The duty-free channels for machinery and for raw materials get locked, and goods already at the port cannot be released. For a plant still installing equipment and still ramping up output, that hurts more than any fine.

There is a more serious layer. Under the relevant provisions of the Investment Promotion Act, continued failure to meet the promotion conditions or the reporting duties can trigger suspension or withdrawal of the promotion, together with clawback of the tax benefits already taken. The exposure is not "no more exemption from here on" — it is "the tax you did not pay over the past few years comes back". The longer it runs, the bigger it gets.

That is why BOI compliance cannot be run on a deal-with-it-when-it-happens basis. Clawback looks backwards. Find the problem in year three and you are making good three years of it.

04How to use the timeline

Enter the date your certificate was issued and the real dates for the three countdowns fall out of it. Then copy the project-specific conditions from the pages attached to your certificate into the breakdown table, one by one, and name an owner for each. After that, update actual progress against plan once a month, and start an extension assessment as soon as any line slips by more than two months, rather than waiting for the quarterly report to raise it.

One more thing: when the business changes, look at the certificate first. Changing products, changing processes, expanding capacity, disposing of equipment, changes in shareholding — run each of these past the certificate conditions before you act, and work out whether an amendment has to be applied for in advance. Applying in advance is a routine procedure. Being found out afterwards is a different matter.

Which specific conditions your own certificate carries, how much room is left before each red line, and whether there are past deviations that need putting right first — all of that has to be checked item by item against the certificate terms, the construction and procurement plan, and how the business is actually running. A review of this kind is usually done once in full by the advisory team, which produces the list and the remedial steps; the company then decides the order in which to deal with them.

Does this reach you?
If any of the above appliesChecked against the official texts by the CTAC Thailand advisory team. The team follows the official gazettes of the BOI, the Revenue Department (RD), the Department of Business Development (DBD) and Customs each week; when the official position changes, this page is updated and marked.

What is in the workbook

  • Three countdowns worked backwards: enter the certificate issue date and get the actual deadlines for machinery imports, first revenue, and the start-of-operations inspection
  • A calendar for the two reporting duties: the quarterly progress report and the annual operating results report, with the stage each one applies to and what ends it
  • A separate row for the tax anchor: the corporate income tax exemption start date kept distinct from the certificate issue date, with a place to reconcile the two
  • A breakdown of the certificate conditions: general conditions plus project-specific conditions, each with a column for timing, a column for evidence, and a column for the owner

Download

Editable workbook (XLSX)
The workbook itself is in Chinese — the column headings carry the Thai form names, so it is usable alongside this page. Ask our advisers if you would like it walked through.

Common questions

All three countdowns start on the same date. Why do extensions have to be applied for separately?

Because they sit with different approval steps: extending the machinery import window, explaining a shortfall against first-revenue progress, and extending the start-of-operations deadline are three separate procedures. They share only one requirement — each has to be raised before the deadline passes. Once it has passed, there is far less room to work with.

We have already started operations. Does that mean the reporting stops?

Starting operations only ends the quarterly project progress report. The annual report on operating results has no end date: as long as the certificate exists and the benefits are still being used, it is due every year. This is the most common misunderstanding.

Why does the corporate income tax exemption need its own start date?

Because its anchor is the first day the promoted activity has revenue, not the date the certificate was issued. Using the issue date shifts the whole exemption window earlier, so in later years the company believes it is still inside the exemption period when it has in fact expired. Get that one box wrong and both the exemption period and the cap are wrong.

Related

Sources

  1. Board of Investment (BOI): the time limits for duty-free import of machinery, the deadline for starting operations and the start-of-operations inspection regime, and the current filing requirements for the quarterly project progress report and the annual operating results report. Retrieved and checked 2026-07
  2. Board of Investment (BOI): Investment Promotion Act B.E. 2520, §31 (corporate income tax exemption runs from the first day the promoted activity has revenue) and §39 (failure to meet the promotion conditions or the reporting duties can lead to suspension or withdrawal, together with clawback of benefits already taken). Retrieved and checked 2026-07
  3. General note: the length of each period, the number of extensions available and the approval channels change as official announcements are updated, and particular promotion measures and industry categories have separate arrangements. This worksheet does not list the number of extensions or penalty amounts; the current BOI announcements (boi.go.th) and the terms of your own promotion certificate govern.
Checked against the official texts by the CTAC Thailand advisory team. We track the gazettes of the BOI, the Revenue Department, the Department of Business Development and Thai Customs every week; when an official position changes, the affected pages are updated and dated.
This page is general information based on the rules in force at the date shown. Thai BOI categories, incentive conditions and foreign-investment rules change often. Before acting on any specific project, check the latest official announcement and have a formal opinion issued on your own facts.
Bring the items you cannot tick off to the advisory team

Once the self-check has produced a list, the order of work and the way to put each item right depend on the individual case.

中文版 · Chinese version