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Thailand Special Economic Zones: 10% Tax Guide 2026

Thailand Special Economic Zones now carry one of the most attractive tax positions available to manufacturers and traders operating outside Bangkok. Under Royal Decree No. 797 B.E. 2568 (2025), qualifying companies in these border-area zones pay corporate income tax at just 10 percent instead of the standard 20 percent, for ten consecutive accounting periods. Yet the benefit is far from automatic. For foreign investors weighing where to locate a Thai project, understanding the eligibility rules, the notification mechanics, and the accounting discipline behind Thailand Special Economic Zones is now essential to protecting the incentive.

What Are Thailand’s Special Economic Zones?

Thailand’s Special Economic Zones (SEZs) are designated development areas along the country’s land borders, created to channel investment into trade, manufacturing, and logistics near neighbouring markets. They differ from the better-known Eastern Economic Corridor, which targets high-technology and advanced industry in the central-eastern provinces. The border zones instead aim to spread industrial growth outward and to capture cross-border supply chains with Myanmar, Laos, Cambodia, and Malaysia. In short, Thailand Special Economic Zones reward businesses that anchor real operations near these trade corridors.

The incentive covers ten provinces: Tak, Mukdahan, Sa Kaeo, Songkhla, Trat, Nong Khai, Narathiwat, Chiang Rai, Nakhon Phanom, and Kanchanaburi. Importantly, however, a company does not qualify simply by holding an address in one of these provinces. The reduced rate applies only to targeted business activities prescribed by the Special Economic Zone Development Policy Committee under the Regulation of the Office of the Prime Minister on the Development of Special Economic Zones B.E. 2564 (2021). The current list of target activities and zone boundaries is maintained by Thailand’s Board of Investment and the SEZ policy authorities.

Key Takeaway: Thailand Special Economic Zones sit on the country’s borders and reward targeted, activity-specific investment. Location alone does not secure the 10 percent rate; the business must fall within the officially prescribed target activities.

The 10% Corporate Tax Rate Under Royal Decree No. 797

Royal Decree No. 797 was published in the Royal Gazette on 5 June 2025 and took effect the following day. It reduces the corporate income tax rate from 20 percent to 10 percent on qualifying net profits earned by eligible companies and juristic partnerships. The Director-General of the Revenue Department later set out the detailed conditions in Notification Regarding Income Tax No. 468, issued on 19 March 2026, which applies retroactively from the decree’s operative date of 6 June 2025.

Consequently, businesses that have already established a qualifying presence can act now, while those still planning a project can build the incentive into their financial models from the outset. Because the rate is cut in half, the Thailand Special Economic Zones incentive can meaningfully improve project economics over a decade of operations.

Feature	Detail
Legal basis	Royal Decree No. 797 B.E. 2568 (2025); Notification No. 468 (2026)
Tax rate	10% on qualifying net profits (vs. 20% standard)
Duration	10 consecutive accounting periods
Eligible zones	10 border provinces (Tak, Sa Kaeo, Songkhla, Trat, and others)
Who qualifies	Companies or juristic partnerships in prescribed target activities
Key condition	Notification to the Revenue Department + separate accounting

Who Qualifies for the Thailand Special Economic Zones Tax Incentive

To claim the reduced rate, a taxpayer must satisfy every applicable condition under the Royal Decree and Notification No. 468. In practice, the Revenue Department expects each of the following to be met and documented.

A permanent place of business in the zone. The company must operate from a permanent building inside the relevant SEZ. If the company was registered before the decree took effect, that building must represent an expansion of, or addition to, an existing operation rather than a nominal address.
Formal notification. The taxpayer must notify the Revenue Department of its intention to claim the incentive, following the prescribed procedure.
No overlapping BOI tax exemption. The company must not also claim a full or partial corporate income tax exemption under the investment-promotion law, which prevents stacking with certain Board of Investment privileges.
No SME rate reduction. The taxpayer must not claim the separate SME corporate tax reduction under Royal Decree No. 530 and its amendments.
No earlier SEZ relief. The company must not have claimed the previous SEZ reductions under Royal Decree No. 591 (2015) or No. 693 (2020).
Separate accounts. The business must keep separate accounting records for qualifying and non-qualifying activities.

Notably, if a company fails to meet any required condition in a given accounting period, its entitlement ends from that period onward. Compliance therefore is not a one-time exercise but an ongoing obligation.

Key Takeaway: The 10 percent rate rewards a genuine, permanent, activity-specific presence. Companies cannot combine it with a BOI income tax exemption or the SME rate, so investors must choose their incentive path deliberately.

How the Thailand Special Economic Zones Incentive Period Works

The ten-year clock does not necessarily start at the next full financial year. Instead, it begins according to when the company files its notification. If an accounting period starts on or after the notification date, that period becomes the first incentive year. However, if the company notifies the Revenue Department part-way through an accounting period, that same period counts as the first incentive year, even if it runs for fewer than twelve months.

As a result, timing carries real financial consequences. A poorly timed mid-year notification can effectively shorten the first year of relief. Foreign investors should therefore coordinate the notification date with their accounting calendar to capture the full value of all ten periods.

Separate Accounting and the BOI Stacking Trap

The tax benefit within Thailand Special Economic Zones is not merely a lower headline rate. It is a compliance-heavy regime that demands rigorous bookkeeping. Companies must calculate net profit under Sections 65, 65 bis, and 65 ter of the Revenue Code. Where a business runs both qualifying SEZ activities and other operations, it must calculate the profit and loss of each separately.

Common expenses that cannot be attributed to a single business must be allocated in proportion to revenue. In addition, losses are ring-fenced: a loss from an SEZ activity may offset only income from that same SEZ activity, and a non-SEZ loss cannot shelter SEZ profit. The company may still file a single Form PND.50 under one taxpayer identification number, provided it attaches working papers that clearly separate each business.

Meanwhile, the ban on combining the SEZ rate with a BOI income tax exemption forces a strategic choice. Many manufacturers instinctively pursue BOI promotion, but a company already enjoying a BOI tax holiday cannot layer the SEZ 10 percent rate on top of it. For some projects the BOI package will prove more valuable; for others, particularly those outside BOI-eligible sectors, the SEZ rate offers a cleaner and longer benefit. This is exactly the kind of decision that warrants professional modelling before any notification is filed.

Key Takeaway: Robust separate accounting is the price of the incentive. Weak working papers, mis-allocated common costs, or an accidental overlap with BOI privileges can all cost a company the reduced rate — and trigger back taxes.

Practical Steps for Foreign Investors in Thailand’s Special Economic Zones

Before filing any notification, foreign investors should confirm the fundamentals of their position in Thailand’s Special Economic Zones. That review should cover the exact SEZ location, the status of the permanent building, whether the intended activity is a prescribed target business, and whether any other tax incentive is already in play.

Companies should also prepare internal working papers ahead of the annual corporate income tax return. These should show revenue by business line, direct expenses by business, the allocation basis for shared costs, losses by business, and the final computation of qualifying net profits taxed at 10 percent. If the incentive is applied incorrectly, the Revenue Department may adjust income or expenses, revoke the relief, and assess tax retroactively together with surcharges and penalties.

For a foreign-owned enterprise, these steps also intersect with company structuring, foreign business licensing, and land or factory arrangements. The zones also complement other location-based reliefs, such as green energy tax incentives, that a project may claim in parallel where the rules allow. Aligning the tax strategy with the corporate and regulatory setup from day one avoids costly restructuring later. Handled well, Thailand Special Economic Zones can anchor a durable, tax-efficient regional platform.

Frequently Asked Questions

Which provinces are covered by Thailand’s Special Economic Zones?

The incentive applies to ten border provinces: Tak, Mukdahan, Sa Kaeo, Songkhla, Trat, Nong Khai, Narathiwat, Chiang Rai, Nakhon Phanom, and Kanchanaburi. A company must operate a qualifying, prescribed target activity from a permanent building within one of these zones to benefit.

How much can a company save under the SEZ tax incentive?

Qualifying net profits are taxed at 10 percent rather than the standard 20 percent corporate income tax rate, for up to ten consecutive accounting periods. The saving depends on profitability, but halving the rate over a decade can materially change a project’s returns.

Can I combine the SEZ rate with BOI investment promotion?

No. A company that claims a full or partial corporate income tax exemption under the investment-promotion law cannot also apply the SEZ 10 percent rate. Investors must compare the two paths and choose the one that delivers greater value for their specific project.

When does the ten-year incentive period begin?

It depends on the notification date. If the company notifies the Revenue Department during an accounting period, that same period becomes the first incentive year — even if shorter than twelve months. Timing the notification carefully helps preserve the full ten years of relief.

What happens if a company breaches a condition?

If a taxpayer fails to satisfy any required condition in an accounting period, the entitlement to the reduced rate ceases from that period onward. The Revenue Department may also reassess tax retroactively, with surcharges and penalties, so ongoing compliance is critical.

Investing in Thailand’s Special Economic Zones?

Lex Bangkok advises international manufacturers, traders, and investors on structuring SEZ operations, securing the 10 percent corporate tax rate, and building the accounting and compliance framework the Revenue Department expects. Our team turns complex incentive rules into a clear, defensible strategy.

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