TaxationSilver report

Published April 2026Insight Research19 min read2026 Edition10 sources, 9 primary-gradeStrong source depth

Pillar-2 Global Minimum Tax (15%): Multinational Readiness

Thailand adopted OECD Pillar-2 global-minimum-tax (15%) effective FY2025 for in-scope multinationals (consolidated revenue >EUR 750M). Top-up tax brings effective tax rate to 15% across jurisdictions. Materially reduces benefit of BOI tax holidays, IBC reduced rates, and other Thai incentive regimes for in-scope multinationals. Smaller multinationals (<EUR 750M) retain full incentive benefit.

Key takeaways

1
Thailand adopted OECD Pillar-2 ( minimum effective tax) effective FY2025.
2
Applies to multinational enterprise (MNE) groups with consolidated revenue >.
3
Thai QDMTT collects top-up tax at source rather than yielding to foreign jurisdictions.
4
BOI tax holidays substantially diluted for in-scope multinationals.
5
IBC reduced rates (3-) retain limited benefit relative to floor.
6
Smaller multinationals (< consolidated) retain full incentive benefit.

Questions this report answers

What's the Pillar-2 mechanism? Per Thailand Royal Decree and OECD GloBE rules: minimum effective tax rate on MNE groups with consolidated revenue >. If Thai subsidiary pays below effective rate, Thailand imposes QDMTT top-up bringing rate to . Alternative: foreign parent collects UTPR if Thailand omits QDMTT.^{[, ]}

What's the BOI/IBC dilution? Per BOI compatibility review: BOI tax-holiday years where effective rate falls below trigger top-up for in-scope multinationals. IBC tier 1 ( CIT) jumps to effective via top-up. Net result: BOI and IBC value substantially diluted for > multinationals.^[]

What's the smaller-MNE picture? Per Revenue Department guidance: multinationals with consolidated revenue < are out-of-scope and retain full BOI/IBC incentive benefit. This creates a structural advantage for mid-sized foreign entrants vs global multinationals at the same Thai-investment scale.^[]

What's the substance-based carve-out? Per OECD GloBE: substance-based income exclusion (SBIE) reduces the tax base for routine returns on tangible assets and payroll, partially preserving incentive value. Thailand's BOI is exploring compensatory incentive packages (cash grants, R&D credits) outside CIT to substitute lost tax-holiday value.^[]

Public-record references

Data as of: 2025-2030 horizon

Executive summary

Thailand adopted OECD Pillar-2 global-minimum-tax () effective FY2025 for MNE groups with consolidated revenue >. QDMTT collects top-up at source.^[]

BOI tax holidays substantially diluted for in-scope multinationals. IBC reduced rates retain limited benefit. Smaller MNEs (<) retain full incentive benefit.^[]

BOI exploring compensatory packages (cash grants, R&D credits) outside CIT. Watch QDMTT enforcement guidance and BOI-incentive evolution as 2026-2028 indicators.^[]

Public-record references

Data as of: 2025-2030 horizon

Pillar-2 implementation structure

Threshold

Value

EUR 750M consolidated revenue

Notes

MNE-group level.

Minimum rate

Value

15% effective

Notes

Tax-base computed per OECD GloBE.

Thai mechanism

Value

QDMTT (domestic top-up)

Notes

Captures revenue at source.

BOI dilution

Value

Substantial

Notes

Tax-holiday years brought to 15%.

IBC dilution

Value

Partial

Notes

3-8-10% rates topped up.

Smaller MNE

Value

<EUR 750M out-of-scope

Notes

Retain full incentive.

Metric	Value	Notes
Threshold	EUR 750M consolidated revenue	MNE-group level.
Minimum rate	15% effective	Tax-base computed per OECD GloBE.
Thai mechanism	QDMTT (domestic top-up)	Captures revenue at source.
BOI dilution	Substantial	Tax-holiday years brought to 15%.
IBC dilution	Partial	3-8-10% rates topped up.
Smaller MNE	<EUR 750M out-of-scope	Retain full incentive.

Public-record references

Data as of: 2024-2026

Implementation timeline

Dec 11, 2024

Event

Thai Cabinet approves emergency decree on top-up tax

Implication

Cabinet-level political backing locks in implementation horizon.

Dec 26, 2024

Event

Royal Gazette publication of Top-up Tax Emergency Decree

Implication

Legal instrument now in force; ~120 days of compliance preparation window.

Jan 1, 2025

Event

Effective date — Pillar-2 begins applying to fiscal years starting on/after

Implication

FY2025 in-scope MNEs (>EUR 750M revenue) now subject to 15% minimum effective rate via QDMTT, IIR, UTPR.

Dec 30, 2025

Event

Cabinet approves draft secondary legislation (QDMTT mechanics, UTPR residual allocation, computation rules)

Implication

Filling in operational guidance gaps; Revenue Department guidance follows.

FY2026 returns

Event

First Pillar-2 returns due (per OECD GloBE timing — 18 months post-fiscal-year-end for transitional period)

Implication

Mid-2027 onward becomes the first real enforcement cycle.

Date	Event	Implication
Dec 11, 2024	Thai Cabinet approves emergency decree on top-up tax	Cabinet-level political backing locks in implementation horizon.
Dec 26, 2024	Royal Gazette publication of Top-up Tax Emergency Decree	Legal instrument now in force; ~120 days of compliance preparation window.
Jan 1, 2025	Effective date — Pillar-2 begins applying to fiscal years starting on/after	FY2025 in-scope MNEs (>EUR 750M revenue) now subject to 15% minimum effective rate via QDMTT, IIR, UTPR.
Dec 30, 2025	Cabinet approves draft secondary legislation (QDMTT mechanics, UTPR residual allocation, computation rules)	Filling in operational guidance gaps; Revenue Department guidance follows.
FY2026 returns	First Pillar-2 returns due (per OECD GloBE timing — 18 months post-fiscal-year-end for transitional period)	Mid-2027 onward becomes the first real enforcement cycle.

EY Global Tax Alert, KPMG Tax News Flash 149, Forvis Mazars Pillar Two analysis

Data as of: Dec 2024 - Dec 2025 enacted/announced

Analyst framing

Why this report matters

Thailand Pillar-2 (15% minimum effective tax, FY2025) reshuffles BOI-tax-holiday and IBC value for in-scope multinationals (>EUR 750M). Smaller multinationals retain full incentive benefit. QDMTT collects top-up tax at source; Competitiveness Enhancement Fund redirects via QRTCs.

Mechanics: how QDMTT, IIR, UTPR interact

Thailand's Top-up Tax Emergency Decree (Royal Gazette 26 Dec 2024) implements all three OECD Pillar-2 charging mechanisms. The Qualified Domestic Minimum Top-up Tax (QDMTT) is the structural anchor: when a Thai constituent entity of an in-scope MNE has an effective tax rate below 15% (e.g., because BOI tax-holiday years have reduced its Thai CIT exposure to 0%), Thailand collects the top-up itself rather than yielding it to the parent jurisdiction. This is the most consequential choice in the framework: without QDMTT, Thailand would lose the top-up revenue entirely to foreign tax authorities applying the Income Inclusion Rule (IIR) or Undertaxed Profit Rule (UTPR) at parent level.

Income Inclusion Rule (IIR): Thailand also applies IIR to Thai-headquartered MNE groups (e.g., CPF, Thai Beverage, PTT global subsidiaries). If a foreign subsidiary of a Thai-listed MNE pays below 15% effective rate in its host country, Thailand collects the top-up at Thai-parent level. Undertaxed Profit Rule (UTPR) is the back-stop: applies when neither QDMTT (at source) nor IIR (at parent) captures the top-up; allocates the residual via formula across UTPR jurisdictions. Thailand's secondary legislation (approved 30 Dec 2025) specifies the UTPR residual allocation mechanism for Thai entities receiving allocation from foreign undertaxed income.

Substance-Based Income Exclusion (SBIE) carve-out: OECD GloBE rules let MNEs reduce the tax base by a routine return on tangible assets (8% Year 1, declining to 5%) and payroll (10% Year 1, declining to 5%). For Thai constituent entities with substantial physical operations (factory, headcount), SBIE meaningfully reduces top-up exposure — partially preserving the underlying BOI incentive value. SBIE rewards operations that look like real economic substance, not paper-shell structures.

Incentive value dilution: pre- vs post-Pillar-2 (in-scope MNE)

BOI 8-year tax holiday (0% CIT during holiday)

Pre-P2 ETR

~0%

Post-P2 ETR (in-scope)

~15% (QDMTT top-up)

Incentive retained?

Largely lost; SBIE partially preserves

BOI 5-year tax holiday plus 50% reduction (years 6-10)

Pre-P2 ETR

~0% then ~10%

Post-P2 ETR (in-scope)

~15% then ~15%

Incentive retained?

Largely lost during holiday; partial in reduction years

IBC tier 1 (3% CIT, headcount >200)

Pre-P2 ETR

~3%

Post-P2 ETR (in-scope)

~15%

Incentive retained?

Partially preserved via SBIE on payroll

IBC tier 2 (5% CIT, headcount >100)

Pre-P2 ETR

~5%

Post-P2 ETR (in-scope)

~15%

Incentive retained?

Limited; SBIE partial offset

IBC tier 3 (8% CIT, baseline)

Pre-P2 ETR

~8%

Post-P2 ETR (in-scope)

~15%

Incentive retained?

Limited; SBIE partial offset

Statutory CIT (20%)

Pre-P2 ETR

20%

Post-P2 ETR (in-scope)

20%

Incentive retained?

Above 15% floor; no top-up

Smaller MNE (<EUR 750M) — any incentive

Pre-P2 ETR

As applied

Post-P2 ETR (in-scope)

As applied

Incentive retained?

Fully retained; out of Pillar-2 scope

Incentive	Pre-P2 ETR	Post-P2 ETR (in-scope)	Incentive retained?
BOI 8-year tax holiday (0% CIT during holiday)	~0%	~15% (QDMTT top-up)	Largely lost; SBIE partially preserves
BOI 5-year tax holiday plus 50% reduction (years 6-10)	~0% then ~10%	~15% then ~15%	Largely lost during holiday; partial in reduction years
IBC tier 1 (3% CIT, headcount >200)	~3%	~15%	Partially preserved via SBIE on payroll
IBC tier 2 (5% CIT, headcount >100)	~5%	~15%	Limited; SBIE partial offset
IBC tier 3 (8% CIT, baseline)	~8%	~15%	Limited; SBIE partial offset
Statutory CIT (20%)	20%	20%	Above 15% floor; no top-up
Smaller MNE (<EUR 750M) — any incentive	As applied	As applied	Fully retained; out of Pillar-2 scope

BOI / Revenue Department / EY, KPMG, Mazars Thailand practitioner analysis

Data as of: FY2025

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