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The Global Minimum Tax Act is Canada's national transposition of the OECD/G20 Inclusive Framework Pillar Two GloBE Model Rules (published December 2021; Commentary March 2022; Administrative Guidance 2022–2024). Unlike the EU, which enacted a binding supranational directive (Council Directive (EU) 2022/2523) requiring 27 Member States to transpose, or the UK and Korea, which amended existing income-tax legislation, Canada chose to create an entirely stand-alone statute outside the Income Tax Act — a distinct structural choice that gives the GMTA its own definitional architecture rather than grafting GloBE mechanics onto existing GAAR and thin-cap provisions.
The GMTA was tabled as part of Bill C-69, the Budget Implementation Act, 2024, No. 1, which enacted the federal Budget 2024 package tabled 16 April 2024. Royal assent was granted on 20 June 2024.
The GMTA enacts two of the three GloBE charges:
1. Income Inclusion Rule (IIR) — charges a Canadian ultimate parent entity (or intermediate parent) top-up tax on low-taxed income of constituent entities in any jurisdiction where the jurisdictional ETR falls below 15%. Applies to in-scope MNE groups (consolidated revenue ≥ EUR 750M in at least two of the immediately preceding four fiscal years) for fiscal years beginning on or after 31 December 2023.
2. Qualified Domestic Minimum Top-up Tax (QDMTT) — collects top-up tax on Canadian-located constituent entities' low-taxed income before any foreign IIR can apply. This ensures Canada retains taxing rights on its own jurisdiction's shortfall, equivalent to the EU's QDMTT election and UK's Domestic Top-up Tax under Part 4 of Finance (No. 2) Act 2023. Also effective for fiscal years beginning on or after 31 December 2023 (retroactive at enactment).
3. Undertaxed Profits Rule (UTPR) — deliberately omitted. The Department of Finance signalled in Budget 2024 that the UTPR would be legislated separately to preserve flexibility on bilateral implementation sequencing and to avoid imposing UTPR liability before major trading partners (US, UK, Japan) had adopted reciprocal rules. As of the GMTA's enactment, the UTPR has not been legislated.
The IIR/QDMTT effective date of 31 December 2023 creates retroactive liability for calendar-year fiscal groups: at royal assent on 20 June 2024, a corporation with a 31 December 2023 year-end was already mid-way through the first affected period. This is structurally analogous to Korea's AITA Chapter V (enacted 31 Dec 2022, IIR effective FY 1 Jan 2024) and Canada's explicit modelling of retroactivity as a policy choice to align with the EU and UK first-period effective dates. The first GMTA compliance returns are due approximately 30 June 2026 (18 months after the first fiscal year-end).
The Canada Revenue Agency is the collecting authority for both the IIR top-up charge and the QDMTT. The CRA issued initial administrative guidance on GMTA filing obligations and the GloBE Information Return (GIR) — the OECD-standardised reporting form — which must be filed within 15 months of the fiscal year end (18 months for the first transition year).
The choice of a freestanding act (rather than amendments to the Income Tax Act or the Income Tax Regulations) has downstream compliance implications: taxpayers and advisors must apply a distinct definitional regime without the benefit of established ITA jurisprudence on residency, associated persons, and thin-cap. The GMTA imports OECD GloBE concepts (covered taxes, substance-based income exclusion, qualified financial statements, transition safe harbour) by reference to the OECD Model Rules and Commentary as authoritative interpretive guides — a statutory incorporation technique that is novel for Canadian direct-tax law.
Canadian-headquartered multinationals (Shopify, Thomson Reuters, Brookfield, Barrick, Agnico Eagle, TD, RBC, Manulife, etc.) and large inbound subsidiaries of US/EU/JP/KR MNEs with Canadian operations.
Exploration Tax Credit), SR&ED (Scientific Research and Experimental Development) investment tax credit, and Clean Technology Investment Tax Credit (ITC) regime are all potentially GloBE-impacted. Under the OECD's Qualified Refundable Tax Credit (QRTC) rules (Administrative Guidance Feb 2023), refundable credits paid within 4 years are treated as income rather than a reduction in covered taxes, preserving their economic value. Non-refundable ITCs reduce the ETR, potentially triggering top-up. Finance Canada has been reviewing how its incentive architecture interacts with GMTA mechanics.
Canada's unilateral Digital Services Tax (filed as 2025-06-29-canada-dst-rescission) was partly premised on the multilateral Pillar Two mechanism (including GMTA) serving as the agreed substitute for unilateral DST regimes — a linkage explicitly acknowledged in US-Canada trade negotiations.
jurisdiction does not have a qualifying IIR, Canada's GMTA cannot collect top-up on the shortfall from non-Canadian entities of in-scope groups. This gap is closed for most major trading partners (EU, UK, Korea, Australia all have IIRs) but remains relevant for US-headquartered groups absent US federal Pillar Two legislation.
Congressional action on GILTI reform)?
calculations for capital-intensive Canadian operations (mining, energy)?
QDMTT and the risk that Canadian QDMTT revenue could be displaced by US GILTI?
ITC regime for Canadian Critical Minerals Strategy investments (see 2025-11-04-canada-budget-2025-cmetc-expansion)?