Hong Kong IRD iXBRL Mandate – Full Wireframe Content
- Hong Kong IRD iXBRL Mandate for Profits Tax Filing
- Mandatory electronic filing of Profits Tax returns using Inline XBRL (iXBRL) format begins for Year of Assessment 2025/26.
What Is the Hong Kong iXBRL Mandate?
- Hong Kong’s Inland Revenue Department (IRD) has officially launched mandatory electronic filing of Profits Tax returns.
- Inline XBRL (iXBRL) is a format in which financial and tax data is embedded directly within an HTML document using
structured tags drawn from an approved taxonomy.
- eTAX / Business Tax Portal (as applicable)
- BIR51 for corporations and BIR52 for unincorporated businesses
- Single, self-contained XHTML document
- No external links or JavaScript permitted
Who Is in Scope?
EUR 750M+ Revenue
Applies to all Hong Kong constituent entities within multinational enterprise (MNE) groups whose consolidated group revenue meets or exceeds EUR 750 million.
Operational Subsidiaries
All Hong Kong constituent entities with a Profits Tax filing obligation, regardless of where the ultimate parent is located or incorporated.
Dormant Entities
Even dormant or inactive Hong Kong entities with a Profits Tax obligation are captured. There are no exemptions based on inactivity or dormancy.
JVs & PEs
Applies to all Hong Kong constituent entities within multinational enterprise (MNE) groups whose consolidated group revenue meets or exceeds EUR 750 million.
Hong Kong IRD Implementation Timeline
2022/23 — Voluntary iXBRL e-filing opens
From YOA 2022/23, corporations may voluntarily file financial statements and tax computations in iXBRL format via eTAX.
The IRD releases the first English IRD Taxonomy Package.
2024 — Traditional Chinese Taxonomy published
The IRD publishes the first edition of its Traditional Chinese IRD Taxonomy Package, confirming the bilingual nature of this
mandate and its applicability to Chinese-language financial statements.
2025/26 — In-scope MNE groups
All Hong Kong entities within MNE groups with consolidated revenue of at least EUR 750 million must e-file Profits Tax returns
in iXBRL via the Business Tax Portal. “Once in, always in” applies permanently.
2028 — Large businesses
Businesses above a domestic turnover threshold (yet to be finalized by the IRD) are expected to join the mandatory regime.
Building capability now significantly reduces the pressure of this deadline.
2030 — Full mandatory e-filing for all corporations
The IRD’s stated goal is full-scale iXBRL e-filing for all corporations and unincorporated businesses in Hong Kong.
What Must Be Filed in iXBRL?
The IRD requires the following to be submitted as iXBRL-tagged data files alongside the Profits Tax return:
- Financial statements (in the applicable format — HKFRS, HKFRS for Private Entities, or other IRD-accepted frameworks)
- Tax computation schedules
- Statement of Comprehensive Income / Profit or Loss
- Statement of Financial Position (Balance Sheet)
- Notes — Related Party Transactions
- Notes — Property, Plant & Equipment
- Main Tax Computation Schedules
Technical Requirements
- All iXBRL filings must comply with the IRD Taxonomy Package.
- Each submission must not exceed 20MB
- No custom extensions permitted
- All tagged values must exactly match the document
Challenges Finance Teams Should Anticipate
Entity Proliferation
The Hong Kong mandate sweeps in all Hong Kong entities within a qualifying MNE group simultaneously.
Business Tax Portal
The eTAX / Business Tax Portal (as applicable) will serve as the digital filing channel for in-scope entities.
Annual Taxo Updates
The IRD releases an updated Taxonomy Package on 1 April each year.
Bilingual Taxonomy
The IRD has published its taxonomy in both English and Traditional Chinese.
How Ez-XBRL Helps You Navigate the Mandate
Ez-XBRL is purpose-built for the iXBRL compliance lifecycle. Our platform combines certified software products with structured regulatory services and flexible engagement models — giving every finance team a path to compliance that matches their capacity, timeline, and in-house expertise.
With significant experience supporting regulatory reporting mandates across multiple jurisdictions — including established iXBRL frameworks such as the UK’s HMRC filing requirements and Ireland’s Revenue iXBRL mandate — Ez-XBRL brings a deep understanding of how structured reporting evolves from policy to practice.
This cross-jurisdictional experience is critical. While each mandate differs in taxonomy design, filing workflows, and regulatory expectations, the underlying challenges remain consistent: managing large volumes of entity filings, adapting to annual taxonomy updates, ensuring data accuracy, and embedding compliance into repeatable processes.
Ez-XBRL’s products and services are built on this global experience — enabling organizations to not only meet Hong Kong IRD requirements, but to do so with systems and workflows already proven in other mature iXBRL environments.
Flexible Engagement Models
| Feature | Self-Service | Managed Services | Hybrid Model |
|---|---|---|---|
| Model | Client-led using Integix | Ez-XBRL-led (End-to-End) | Shared Responsibility |
| Execution Responsibility | Internal team handles tagging & mapping | Ez-XBRL experts perform tagging | Co-sourced; tasks split based on skills |
| Review & Control | Full internal ownership & sign-off | Client reviews drafts via XOR | Client decides level of involvement |
Which model is right for you?
– Choose Self-Service if your team has the capacity and wants to build a permanent in-house iXBRL capability using Integix.
– Choose Managed Services if your team prefers to delegate the full preparation workload to Ez-XBRL experts, retaining
oversight and sign-off via XOR.
– Choose the Hybrid Model if you are transitioning toward self-service and want expert support during the learning curve —
or if your entity volume makes a shared model operationally practical.
Integix — XBRL & iXBRL Processing Platform
A SaaS platform that enables organizations to manage the full iXBRL preparation workflow in-house.
- Converts financial reports in multiple formats — PDF, Word, Excel — directly into iXBRL
- AI-driven automation and smart tagging to map and tag relevant financial data using the IRD Taxonomy Package
- Built-in pre-validation checks that flag tagging errors before submission
- Validation engine that guides users to identify and fix any errors
- Generates a regulator-ready iXBRL filing package for submission via the BTP
- Certified by XBRL International
- Available under a Self-Service license model for teams managing filings in-house
XOR — Review & Collaboration Platform
A certified, secure, cloud-based portal that strengthens governance and oversight across the iXBRL reporting process.
- Role-based access control for structured, auditable review workflows
- Secure upload and download of Inline XBRL documents
- Collaborative review of iXBRL tags using XOR’s built-in Inline XBRL Viewer
- Version control to ensure quality and data accuracy, supported by built-in validations
- Review iXBRL reports for calculations, extensions, comments, approvals, and more
- Customised email notification system to manage approval workflows across teams
- Built-in user guide and help features for rapid onboarding
Frequently Asked Questions
The threshold applies to the consolidated revenue of the MNE group as a whole — not to individual Hong Kong entities.
Yes. Dormant and inactive Hong Kong entities with a Profits Tax filing obligations are explicitly included in Phase 1.
What happens if our group’s revenue falls below EUR 750M after we have entered the mandatory regime?
The “once in, always in” rule applies.
No. For Phase 1 mandatory filers, the Business Tax Portal (BTP) is the required filing channel.
The IRD has defined a mandatory minimum tagging list for Phase 1.
No. The IRD does not permit taxonomy extensions.
Volume management is one of the primary challenges of this mandate. The most effective approaches involve using a centralized tagging platform (such as Integix) that allows teams to manage multiple entity filings from a single workflow, combined with a review portal (such as XOR) that provides collaborative approval processes with audit trail visibility. Organisations with very large entity populations may also benefit from a Managed Services or Hybrid engagement model with Ez-XBRL.
For groups managing a large number of Hong Kong entities, Ez-XBRL helps streamline the process by allowing teams to work directly from the flat view and export the XHTML filing package.
Where multiple subsidiaries follow a similar reporting structure, Integix can leverage the Peer Company option by attaching the secondary document and applying a secondary overlay. This significantly reduces mapping time and improves efficiency across similar filings.
For entities with materially different reporting formats or disclosure structures, fresh mapping from the flat view will still be required.
Yes. Phase 2 (expected 2028) will capture large businesses above a domestic turnover threshold.
Prepare for Hong Kong iXBRL Compliance with Confidence
Experience a workflow-driven iXBRL platform designed to simplify Hong Kong IRD reporting — helping teams reduce manual effort,
improve accuracy, and streamline multi-entity compliance workflows.