Manufacturing setup in Thailand 2026: How to set up a factory and start production

BOI eligibility starts with the production activity rather than the company's general industry description.

Use the sequence: Product → production process → machinery → BOI activity

The 2026 BOI application process asks applicants to provide production-process information and main-machinery details. The application therefore needs to reflect the real factory being planned.

One practical mistake is choosing an activity because its title sounds close to the product. Read the activity conditions as carefully as the activity name. Required processes, technology levels, investment conditions, or product limitations can change eligibility.

Once the activity is identified, check the conditions attached to it. Focus first on conditions that affect factory design and investment:

• Minimum investment requirement
• Production or value-added requirement
• Machinery conditions
• Environmental requirements

BOI's general criteria set a THB 1 million minimum investment excluding land and working capital unless the activity states otherwise. The guide also requires a modern and substantial production process and sets machinery eligibility rules. You also remember to treat BOI eligibility as a project-design check rather than a tax calculation.

BOI promotion covers more than corporate income tax.

The 2026 BOI framework includes non-tax privileges such as permission to bring skilled workers and experts into Thailand, permission to own land under Section 27, and permission to remit foreign currency abroad. Tax privileges include qualifying machinery and raw-material duty treatment and corporate income tax incentives according to the approved activity.

For factory setup, the more useful question is: Which BOI privileges change the way this project needs to be structured?

The facility model depends on how much production control you need and how much capital you want to commit before operations begin.

A ready-built factory works well when the production process fits an existing industrial building with limited structural changes.

The main advantage is a shorter path from site selection to fit-out. Capital stays focused on machinery and production systems rather than full facility development.

Check the actual building against 4 operating requirements:

• Floor loading and usable production space
• Electrical capacity and utility connection
• Wastewater and environmental infrastructure
• Expansion space and machinery access

Do not assume that “factory ready” means “production ready.” The building still needs to fit the planned activity and applicable approvals.

Greenfield development makes more sense when production requires a purpose-built layout or specialised infrastructure.

Common reasons include heavy machinery, dedicated process utilities, specialised pollution-control systems, or a facility designed around future expansion.

Greater control comes with more dependencies. Land rights, building design, construction approvals, infrastructure installation, and factory requirements all need to stay aligned with the approved project.

Land needs to be treated separately from factory ownership.

A foreign-invested project often uses a lease structure. Promoted companies can also apply for permission to own land required for the promoted activity under Section 27 of the Investment Promotion Act. The 2026 BOI guide lists land ownership among the available non-tax privileges, while the project still needs to follow the applicable BOI conditions.

IEAT provides another route for qualifying businesses inside industrial estates. Section 44 of the Industrial Estate Authority of Thailand Act allows an industrial or commercial entrepreneur to receive permission to hold land in an industrial estate or free zone for the approved business.

Check the land route before treating a greenfield option as commercially viable.

The industrial site structure determines who manages the site, which infrastructure is already available, and how site-level approvals are coordinated.

An IEAT industrial estate operates under the Industrial Estate Authority of Thailand framework.

IEAT's role includes developing industrial land and utilities, granting or coordinating approvals within its authority, providing applicable privileges, and supervising environmental and safety management inside industrial estates. IEAT also operates a One Stop Service function for businesses inside its estates.

An IEAT estate therefore gives you a defined industrial operating environment.

A private industrial park needs its own due diligence because the term “industrial park” does not automatically mean the site operates under IEAT authority.

If you are planning to set up inside an industrial park, check and ask 4 practical questions:

• Who legally manages the development?
• Which approvals does the operator coordinate?
• What utility capacity is available to the exact unit or plot?
• Which obligations remain with the manufacturer

Remember that a nice sales brochure tells you what the park wants to offer. A site decision needs evidence of what your factory will actually receive.

A standalone site gives greater freedom over facility design and site configuration.

The project team also carries more responsibility for land-use verification, infrastructure planning, environmental requirements, and coordination with local authorities.

This route fits operations that need specialised land conditions or infrastructure that standard industrial estates cannot support efficiently.

Use the project objective as the first filter before comparing individual sites.

The table gives you a starting point rather than a final answer. Two sites in the same category can still differ significantly in utility capacity, permitted use, expansion space, and approval responsibilities.

Once the preferred site structure is clear, due diligence needs to answer one practical question: Can this exact site support the factory you plan to operate without creating major upgrades, approval problems, or expansion constraints later?

Use the project brief created earlier and verify each site against the same criteria.

IEAT estate information shows that electricity, water, wastewater treatment, and other infrastructure differ between estates. Site-level verification therefore needs to go beyond confirming that the wider estate offers the required service.

Based on JTM's on-the-ground experience, the most useful site comparison is not “Which estate looks better?” but “Which site requires the least compromise against the approved production plan?” A lower rental rate can lose its advantage once electrical upgrades, wastewater work, building modification, or future relocation risk are added.

Factory approvals depend on the production activity and the operating characteristics of the facility.

Start with the current Department of Industrial Works factory classification.

DIW's current schedule classifies factory activities under Categories 1–3 and applies activity-specific rules. The thresholds therefore cannot be reduced to one universal worker-count or horsepower rule across every manufacturing project.

Find the activity that matches the actual production process, then confirm which category and conditions apply.

The factory category determines the next regulatory step.

Category 2 activities follow the applicable notification route. Category 3 activities require the applicable factory licensing process before establishment or operation according to the governing requirements.

DIW has been updating Category 2 notification forms and Category 3 licensing forms during 2026 as part of the department's move toward electronic licensing.

Use the current DIW classification and forms at the time of application instead of relying on old third-party guides.

EIA and EHIA requirements depend on the project type and applicable scale thresholds.

Thailand's environmental framework contains activity-specific thresholds. ONEP guidance shows different EIA treatment across industrial activities according to the relevant project type and production capacity.

The practical task is to connect the planned factory to the current environmental schedule before construction or major equipment commitments advance too far.

Some production activities sit under additional sector rules.

Food manufacturing, controlled chemical use, energy systems, and other regulated activities need their own approval review.

Avoid building one generic licence checklist for every Thailand factory. Build an approval matrix from the actual production process.

Factory setup works best as a dependency sequence. Each step needs to leave behind the documents, approvals, or technical decisions required by the next one.

A practical rule is: do not move major capital forward while an earlier project assumption is still unresolved.

Start with the project scope developed earlier and turn it into the BOI investment case. The application needs to describe the business activity, production process, main machinery, and investment structure clearly enough for BOI to assess the actual project.

BOI applications are submitted through the e-Investment system. The 2026 guide sets formal evaluation periods from 40 to 90 working days depending on project investment size, starting after complete documentation has been submitted.

Before moving on, confirm that the product, production flow, machinery plan, and investment amount tell the same story. Inconsistencies here often create amendments later when the site or equipment has already been selected.

A location moves forward only when several suppliers demonstrate the capability required by your product rather than simply listing the process on their websites.

Once the investment structure is clear, establish the Thai entity with activities that match the planned operation.

BOI's current procedure allows the promotion application to begin before the final promotion certificate. Company registration and shareholder documents are then required during the certificate stage. Thailand's Department of Business Development provides digital company registration through DBD Biz Regist.

Before moving on, compare the registered company activities with the BOI project scope. If the company also plans to trade third-party products or provide separate services, review those activities independently rather than assuming the manufacturing structure covers them.

Turn the preferred site into a legally usable manufacturing location only after the project requirements and site due diligence are complete.

Depending on the setup, this stage can include the factory lease, approved land-control route, IEAT land-use permission, or other site documentation. Businesses inside an IEAT estate follow IEAT procedures for land use and business operation within the estate framework.

Before signing, confirm 4 points: permitted industrial use, facility rights, utility availability, and responsibility for required upgrades.

Convert the production process into the physical factory layout.

A ready-built facility usually requires fit-out and modification around the existing building. A greenfield project adds full construction and infrastructure development.

Design the factory around the actual machinery flow rather than fitting equipment into whatever space remains. Check machinery access, utility routing, environmental systems, and future production space before construction or modification is locked.

Before moving on, the technical layout needs to match both the production plan and the regulatory requirements identified earlier.

Install machinery against the approved production flow and final factory layout.

For BOI-promoted projects, machinery needs to follow the applicable BOI conditions. Machinery receiving import-duty privileges must also correspond with the promoted project, with the machinery master list handled through the eMT system.

Before installation, compare the final purchase list with the BOI project and factory layout. Changes in machine type, capacity, production role, or quantity deserve review before equipment arrives on site.

The same check applies to supporting systems such as electrical supply, compressed air, wastewater treatment, and production utilities.

Move the regulatory requirements identified earlier into their final implementation stage.

Complete the applicable factory notification or licence process, environmental obligations, estate requirements, and sector-specific approvals according to the project.

A simple approval tracker is useful here:

Keep the final approval documents linked to the same project file used for machinery, site, and production planning. The records will also support later operation-start checks.

Prepare the people and internal controls needed to run the facility before commercial production begins.

Define responsibilities for production, maintenance, compliance, and factory documentation. Staffing also needs to reflect the production capacity and operating schedule planned earlier.

For qualifying promoted projects, BOI non-tax privileges include permission to bring skilled workers and experts into Thailand for promoted activities.

Before moving on, confirm that the factory has both the required workforce and a named owner for each operating responsibility. A technically complete facility still struggles at launch when maintenance, compliance, or production-control ownership is unclear.

Use commissioning to verify that the factory performs as planned before treating construction completion as production readiness.

Run machinery trials, confirm production flow, complete required inspections, and compare the operating facility with the approved project documentation.

BOI's commencement process reviews areas including machinery, production process, factory layout, location, registered capital, and relevant licences. Formal BOI commencement therefore checks compliance with promotion conditions rather than simply the date the first product is manufactured or sold.

A useful final check is to compare 4 layers side by side:

Based on JTM's local execution experience, the final commissioning review is valuable because small differences accumulated during setup often become visible only when the full production line is tested together.

A Thailand factory budget needs to show how much capital is required before production starts and what the operation will cost once the factory is running. Build those two numbers separately before comparing sites or incentive packages.

Start by separating the factory budget into two groups. This helps you see the capital required to reach production and the ongoing cost of keeping the factory running.

Setup investment

• Factory deposit or land-related commitment
• Construction, fit-out, or building modification
• Machinery, tooling, and installation
• Utility upgrades and compliance infrastructure

Recurring operating cost

• Rent or industrial estate charges
• Labour and staffing
• Electricity, water, and maintenance
• Ongoing compliance and facility-related costs

When comparing sites, calculate both groups using the same planned production capacity. A factory with lower rent can still require more total investment if it needs major electrical upgrades, wastewater work, or building modification.

Avoid using broad “average factory setup cost” figures as the main decision tool. The more useful benchmark is the total cost required to make each shortlisted site support your actual production plan.

Infrastructure gaps are easy to underestimate during early site comparison. The actual requirements depend on the production process and the condition of each site, so the examples below represent common issues that manufacturers may find during technical site review.

Other costs can appear once the shortlisted site is inspected in more detail. Use the technical requirements defined earlier to identify which upgrades apply to your factory, then confirm which costs are included in the landlord or estate offer and which remain with the manufacturer.

Build the base investment case before adding BOI incentives. Once the project has a confirmed activity, location, and applicable promotion conditions, add the benefits that genuinely change its cash requirement or tax position.

Thailand's 2026 BOI framework includes activity-based incentives and additional area-based measures. Projects in qualifying BOI-promoted industrial estates or zones can receive an additional year of corporate income tax exemption, subject to the applicable activity conditions. The EEC and other economic corridors also have their own eligibility criteria rather than providing the same incentive automatically to every project.

A simple way to test the project is to run two versions:

Avoid using an expected tax benefit to make an otherwise weak site or facility look attractive. The operating case needs to make sense first.

The final comparison needs to include more than rent versus construction cost.

Assess 4 cost areas over the planned investment period:

A greenfield project makes financial sense when the value of production control and planned expansion justifies the extra capital. A ready-built factory is stronger when the existing facility already supports the production process without expensive modification.

Before choosing between them, compare total setup investment + recurring facility cost + required upgrades + future expansion cost using the same production volume and planning period.

The right manufacturing setup depends on production control, investment commitment, facility requirements, and regulatory complexity.

Before approving direct manufacturing investment, confirm four points:

• Legal operating structure
• Production and BOI scope
• Site and facility feasibility
• Approval and investment requirements

If the product still needs supplier or production validation, sourcing in Thailand first can reduce commitment before a direct factory setup.

Most setup mistakes happen when a company commits to a site, budget, or operating structure before the production requirements and approval path are fully clear. The points below are common issues to check early so they do not turn into redesign, extra cost, or approval delays later.

• Choosing a site before defining the production process: The building may look suitable at first, yet machinery layout, utilities, wastewater needs, or expansion requirements can make it impractical later.
• Treating BOI eligibility as a tax question only: BOI conditions also affect machinery, land privileges, skilled foreign personnel, and the approved production scope.
• Assuming manufacturing covers every business activity: Trading third-party products, providing services, or adding other commercial activities can require separate legal review.
• Using old factory licence thresholds: Factory classification depends on the current DIW activity schedule, so old worker-count or horsepower rules can lead to the wrong approval path.
• Comparing sites by rent alone: Lower rent can be offset by electrical upgrades, building modification, wastewater work, or weak expansion capacity.
• Assuming an industrial park handles every approval: The operator’s role differs by site, so confirm which approvals and infrastructure responsibilities remain with the manufacturer.
• Changing machinery or production scope after approvals without review: Changes in capacity, equipment, products, or factory location can affect BOI conditions and other approvals.
• Treating construction completion as production readiness: Machinery testing, operating approvals, environmental requirements, and commissioning still need to be completed before the factory is fully ready.

JTM supports manufacturing setup by connecting the project on paper with what actually needs to work on the ground.

Project and manufacturing feasibility

We help turn the product requirement into a clear production scope, facility requirement, investment route, and local execution plan. The objective is to identify major setup constraints before the project reaches expensive commitments.

Site scouting and local verification

Factory scouting needs more than finding available buildings. JTM can help compare sites against production requirements and verify practical conditions with industrial estate operators, landlords, and local technical parties.

Local coordination during setup

Manufacturing setup involves communication across different local parties. We help keep the production plan, facility requirements, approval work, and local execution aligned as the project moves forward.

From setup decision to operational execution

A setup plan creates value only when the final factory still reflects the assumptions used to approve the investment. JTM's role is to help keep that connection visible from early project validation through site preparation and local implementation.