Entity Setup
Global Minimum Tax Act Explained: What Multinational Enterprises in Canada Must Prepare For
The Global Minimum Tax Act is in force — here’s what qualifies an MNE, what returns they must file, and how to calculate the top-up tax under Pillar Two starting now.
By NomadicTax Research Team • 5-8 min read • July 9, 2026
## What Is the Global Minimum Tax Act (GMTA)?
Enacted on **June 20, 2024**, the GMTA implements the OECD’s Pillar Two rules in Canada. It ensures large multinational enterprises (MNE groups) pay a **minimum effective tax rate** on profits in every jurisdiction. ([canada.ca](https://www.canada.ca/en/services/taxes/excise-taxes-duties-and-levies/global-minimum-tax.html?utm_source=openai))
Key terms:
- **MNE Group**: A foreign-parented multinational enterprise with various constituent entities.
- **Constituent Entity**: A part of an MNE group located in Canada (branch, subsidiary, etc.).
- **GloBE Information Return (GIR)**: A compliant disclosure for many MNEs reflecting profits, taxes paid, and top-up tax (if needed) according to the GMTA.
## Filing Obligations and Deadlines
- For many Canadian constituent entities, the **GIR filing deadline** for the 2024 fiscal year is **June 30, 2026**. ([canada.ca](https://www.canada.ca/en/services/taxes/excise-taxes-duties-and-levies/global-minimum-tax/get-ready-file.html?utm_source=openai))
- Canadian entities in foreign-parented MNE groups must submit a GIR or notification of central filing by that date. Failure to do so can trigger **penalties**, especially if no exchange relationship with another participating jurisdiction is activated. ([canada.ca](https://www.canada.ca/en/services/taxes/excise-taxes-duties-and-levies/global-minimum-tax/get-ready-file.html?utm_source=openai))
## Key Calculation Concepts
- **Effective tax rate** under Pillar Two: Based on factors like profits, taxes paid, deferred tax assets, etc.
- **Top-up tax**: If the rate is below the threshold in any jurisdiction, a top-up applies such that overall minimum rate is enforced.
- **Safe harbour provisions** may apply (qualified domestic minimum top-up tax) if certain criteria are met.
## Practical Preparation Steps
- **Identify** whether your organization qualifies as an MNE group under GMTA.
- **Gather data**: financials for all constituent entities—profits, taxes paid, deferred tax items.
- **Calculate provisional effective tax rates** across jurisdictions.
- **Determine if top-up tax or safe harbour applies**, and prepare GIR filing accordingly.
- **Implement internal controls** to ensure data consistency, especially for foreign currency conversions and deferred tax obligations under different jurisdictions.
## What Happens If You Miss the Deadline?
CRA has stated that penalties won’t be imposed for missing local GIR filing obligations between **July 1 and December 31, 2026**, if you’ve centrally filed in another participating jurisdiction and notified CRA by June 30. However, **after December 31, 2026**, local penalties may apply if no centralized filing or exchange relationship is recognized. ([canada.ca](https://www.canada.ca/en/services/taxes/excise-taxes-duties-and-levies/global-minimum-tax/get-ready-file.html?utm_source=openai))
## Example
An MNE headquartered in Germany has a Canadian subsidiary with $10 million in profits taxed at 15%. If the OECD minimum becomes 15% (for example), and some other jurisdictions are much lower, the group must calculate whether total taxes across all locations average below that minimum. If yes, a top-up is owed in jurisdictions like Canada or others as prescribed.
**Key takeaway**: The GMTA places significant reporting and potential tax payment obligations on large MNE groups. Accurate financial data, timely filing, and awareness of exemption or safe harbour rules are critical to avoid penalties.