Before relocating an assembly operation to Thailand, what should investors map first?

Relocation projects often begin with a tax or incentive question:

“Can we get BOI?”

or

“Should we use a Free Zone?”

Those are important questions, but they come too early if the production process has not been defined.

A small change — local processing instead of simple assembly, domestic sales instead of export-only, a different machine set or a regulated finished product — can change the required permissions and the economics of the incentive route.

An overseas manufacturer plans to move part of its assembly process to Thailand. Components will be imported, processed or assembled locally and the finished industrial product may be exported or sold in Thailand.

The investor wants one implementation plan covering factory permissions, investment incentives and customs benefits before committing to the site.

The project should be mapped in layers.

Start with a process flow, not a corporate chart.

Identify:

• imported components and raw materials;
• each processing / assembly step;
• machinery and power requirements;
• headcount;
• testing, packing and storage;
• waste or emissions;
• local sourcing; and
• domestic versus export sales.

That factual map drives almost everything that follows.

Thailand’s factory regime classifies factories by the type of activity and the thresholds specified for that activity. DIW maintains the current schedule identifying whether a particular operation falls into factory category 1, 2 or 3.

Do not rely on a generic statement such as “below 50 horsepower means no factory licence.” The correct classification depends on the scheduled activity and its specific thresholds.

The proposed machinery list and process description should therefore be checked against the current DIW classification before lease commitments and installation dates are fixed.

BOI promotion depends on the promoted activity and the conditions attached to it. A project described commercially as “assembly” may need to be classified more precisely for BOI purposes.

The analysis should cover not only whether an activity is eligible, but also whether the planned machinery, investment, local content, technology, capacity or other project conditions fit the relevant promotion category and current measures.

BOI and customs regimes are not interchangeable.

A Customs Free Zone, bonded warehouse, IEAT free zone or another customs incentive can be valuable where imported inputs are processed or assembled for export, but each has its own licensing, location, control and operating requirements.

The investor should model the import/export flow and duty position before choosing the site merely because it is marketed as “tax efficient.”

The finished product or imported component may also be subject to Thai Industrial Standards Institute (TISI) requirements, import controls or other product-specific approvals.

The correct time to identify these is before purchase orders and launch dates are committed — particularly where there is uncertainty over whether a mandatory standard applies to the exact product specification.

We normally start with the process flow and bill of materials, then check machinery and power requirements, workforce, site and industrial-estate status, factory classification, BOI eligibility, customs treatment, domestic-versus-export sales, Thai Industrial Standards Institute requirements, utilities, environmental interfaces and any foreign-business issues around trading or services.

Typical mistakes are choosing an incentive before defining the promoted activity, treating “assembly” as one universal factory category, selecting a customs zone without modelling the actual goods flow, assuming factory approval also clears product standards, and committing to a site before machinery, utilities and non-manufacturing activities have been mapped.

Before the investor signs the site or machinery commitment, build a regulatory matrix from the process flow:

process → factory classification → BOI → customs → product standards → site / utilities → operating approvals.

That sequence usually produces a more reliable project budget and launch timetable than starting with an incentive label and trying to make the operation fit it later.

• Factory Act B.E. 2535 (1992), as amended, and the current Ministry of Industry schedule classifying factory activities; Department of Industrial Works (DIW) official factory-classification resources.
• Thailand Board of Investment, current Investment Promotion Guide and announcements on eligible promoted activities.
• Customs Act B.E. 2560 (2017) and Thai Customs guidance on Free Zones, bonded regimes and other customs incentives.
• Industrial Product Standards Act B.E. 2511 (1968), as amended, and Thai Industrial Standards Institute requirements for compulsory standards.