Building a plant in the EEC: how the incentives actually work

01Three provinces is the boundary, not the qualification

The question we hear most at site-selection stage is: how much more do we save in the EEC than somewhere else? That asks it in the wrong order. Three things decide what you can get — which route you take, what tier the activity is graded at, and which class of plot the plant lands on.

The statutory scope of the EEC is only Chachoengsao, Chonburi and Rayong. Inside that scope there is a further layer, the promotional zone, and it is not an administrative area: only three classes of land can apply to be designated — industrial estates, government or PPP land, and private industrial clusters — and it counts only once approved. The list is added to by announcement.

The two routes ask different things of where you land. The EECO route lists two prerequisites: you operate inside a designated promotional zone, and the investment falls in one of the 5 target clusters (medical and wellness, digital, next-generation automotive, bio-circular-green economy, services). On the BOI route, the three provinces as a whole have been announced as an investment promotion zone; the baseline is the activity category and the tier, and the class of plot decides only the location add-on layer.

Sort out which route the question is about first. “Not on the promotional zone list means no incentives” holds for EECO and does not hold for BOI. “Anywhere in the three provinces will do” holds for the BOI baseline and holds neither for EECO nor for the location add-on. Ask about the same plot under the two routes and you get opposite answers.

02Two parallel routes, and no double benefit on one project

The EECO route runs under the Eastern Special Development Zone Act: you file an investment proposal, and the incentive review and negotiation committee and then the EEC Policy Committee assess it on four dimensions — strategic, economic, environmental and social. The official wording is negotiation-based and tailor-made: settled case by case, not granted because you filed. The BOI route runs under the Investment Promotion Act, graded by activity category and A tier, with published conditions and a timetable you can plan around.

The boundary between them is drawn by a BOI amending announcement: where the EEC Policy Committee has already announced a grant of rights for a particular industrial promotional zone, operators in that zone may still apply for BOI promotion under the Investment Promotion Act, but may not apply for duplicate incentives on the same project. That replaced the earlier wording under which the BOI application period for such a promotional zone was treated as closed. The provision now in force governs only duplication: it imposes no overall either/or, and it fixes no point at which the choice has to be made. Decide which route is your main line before you file.

03On the BOI route, grade the activity and tier before you cost the site

The order cannot be reversed. This set of add-ons is open only to the A tiers; the B tiers are not covered, and a number of categories are named as excluded — deep-sea fishery, air transport, maritime transport and rail transport among them, with the full list being whatever the BOI Office's current announcement says. The add-ons come in two groups. The capability group hangs on human resource development or on research and development. The location group looks at whether you land in one of the specific industrial promotional zones, or in an industrial estate or promoted industrial zone within the three provinces — where the activity category itself already requires being in an industrial estate, this layer is not granted a second time. The form varies by tier: the top tier gets additional exemption years, the rest mostly get tax at half rate after the exemption period ends.

Three places this is most often miscalculated. First, one item within each group, and the two groups stack: pick one of the two capability items, pick one of the two kinds of location, and a project that meets both groups takes both add-ons. Second, the years are capped cumulatively — past the statutory number of years the half-rate period is no longer given, and it has to be counted together with other measures such as research and development; the official documents do not word this identically. Third, the amount is a ceiling too: for the later tiers the exemption is capped at the approved investment, land and working capital excluded, and only the earliest tiers are uncapped. Which tiers are uncapped, and on what base, is in the table at the foot of this page.

04The add-on is a commitment, not a checkbox

Both capability items carry hard thresholds. Human resource development has to be a cooperation with an educational institution in one of the specified forms — WiL, cooperative education, dual vocational training — and you have to take in enough students or trainees to meet the required number or proportion. Research and development spending has to reach the required proportion of total sales in the project's first three years, or a required amount. The official wording is “the first 3 years”, not “the past three years”, and the two readings do not produce the same threshold. The same spending, and the same trainee head count, cannot be exchanged again for incentives under another measure. What follows the commitment is continuing reporting and verification, and that belongs in the calculation as a cost item of its own.

05Land, wages and timelines: three separate ledgers

On land, a metal-parts or plastic-parts plant may find this matters more than the exemption. A foreign-owned company cannot in principle hold land; for manufacturing the most realistic route is the land-holding privilege that section 27 of the Investment Promotion Act gives a promoted company. But the BOI's current list of promoted activities has closed that door for six metal, industrial chemical and plastic categories, for applications submitted after the new rule takes effect, leaving an exception only for established investors who meet a test of several past promoted projects plus a cumulative investment threshold. Those categories happen to cover a great many of the auto-parts and metalworking projects coming to Thailand. Falling inside the restriction does not mean you cannot buy land at all: holding land inside an industrial estate under the Industrial Estate Authority of Thailand Act is a separate and independent legal basis, and a large share of the plots inside EEC promotional zones are industrial estates anyway, so check both when siting. That second route comes from a secondary source and has to be verified against the text of the law and the position of the competent authority.

The wage ledger and the tax ledger belong on the same map. All three provinces sit in the highest band of Thailand's minimum daily wage: where the incentives are most concentrated, labour cost is high too. The high-speed rail linking three airports, U-Tapao airport, Laem Chabang port phase 3 and Map Ta Phut industrial port phase 3 each have an official target operating year, but those are planning targets rather than fixed dates — treat them as upside.

Which route to check the plot under, what tier the activity can be graded at, and whether the land-holding restriction reaches you: these pull on one another, and each has to be verified against what the business actually does and the announcements in force at the time of filing.