XBRL vs. iXBRL: The Practical Guide to KVK Filing for the 2025 Financial Year

The 2025 Mandate is Coming: Is Your KVK Filing Strategy Ready?

For years, Standard Business Reporting (SBR) in the Netherlands mainly served micro, small, and medium-sized entities.

Now, the landscape is shifting.

Starting in the 2025 financial year, “Large” legal entities must file their statutory annual reports. They must file them with the Chamber of Commerce (KVK).

They must file these reports using SBR.

This isn’t a simple “save as” change. It pushes large organizations into a defined technical framework (the Dutch Taxonomy) and structured data validation rules. Perhaps most importantly, it forces a choice that affects your entire reporting process: Should you file in XBRL or iXBRL?

Here is your practical guide to the new requirements. It explains the format differences. It also shows how to prepare your team without doubling your workload.

The Choice: Pure Data (XBRL) vs. The Full Picture (iXBRL)

 SBR now supports two distinct formats. While they share the same DNA (they both use the Dutch Taxonomy to tag data), they serve different purposes.

1. XBRL: The “Data-First” Approach

Think of a classic XBRL instance as a structured data dump. Computers can read it efficiently, but it doesn’t suit human eyes.

Best for: Reports that fit strictly into a standard model without custom formatting.

The Scope: The SBR standards explicitly scope this format for NL GAAP annual reports.

The Vibe: “Just the facts.”

2. iXBRL: The “Document” Approach

Inline XBRL (iXBRL) is a human readable XHTML document (like a webpage) with XBRL tags hidden inside the text and numbers.

Best for: When presentation matters. It lets you keep the story flow, branding, and layout of a traditional annual report, while meeting digital requirements.

The Scope: Essential for IFRS filers and complex NL GAAP reports that rely heavily on narrative disclosures.

The Vibe: “Read the story, process the data.”

Decision Matrix: Which Format Should You Use?

Choosing the right format depends on two critical factors: your accounting standards and your desire for control over presentation.

Key Takeaway: If you report under IFRS, plan for iXBRL immediately. If you report under NL GAAP, you have a choice—but as your entity grows and your narrative reporting becomes more complex, iXBRL often becomes the superior option for maintaining a “single version of the truth.”

What “Large” Entities Need to Do Now

If you fall into the “Large” category, the clock is ticking toward the 2025 financial year start date. Here is your immediate checklist:

1. Confirm Your Basis: Are you strictly NL GAAP, or are you moving toward IFRS? This dictates your technical limitations.
2. Audit Your Taxonomy: Ensure you are aligning with the correct version of the Nederlandse Taxonomie (NT).
3. Process “Dry Run”: Don’t wait until the deadline. Validate your data against KVK business rules early.
4. Solve the “Narrative Gap”: If you choose iXBRL, you need a way to tag text blocks (narratives) consistently, not just the financial tables.

The Practical Solution: How Report Authority Fits In

The expansion of KVK requirements creates a new headache: Hybrid needs.

You may have a parent company that needs a polished iXBRL report for stakeholders. Your smaller subsidiaries may only need a standard XBRL instance. Managing two different software tools or processes for this is inefficient and risky.

This is where Report Authority bridges the gap.

Report Authority handles the new KVK mandate’s complexity.

It treats your report as a single source of truth, no matter the output format.

• One Report, Two Outputs: Whether you need a structured XBRL instance for a subsidiary or a pixel-perfect iXBRL annual report for the group, you generate it from the same environment. No rebuilding from scratch.
• Unified Tagging: Link your numbers directly to Excel or finance systems. When the source data updates, both your narrative and your tags update automatically.
• Roll-Forward Reliability: The biggest cost in digital reporting is the first year. Report Authority lets you roll forward your structure and tags to Year 2, turning a compliance burden into a repeatable process.

Ready for 2025?

The move to mandatory SBR for large entities is a sign of the times: reporting is becoming digital-first. By choosing the right strategy—and the right tool—you can ensure that “electronic filing” doesn’t mean “electronic headache.”

Learn more about Report Authority for KVK Filing

FAQ: Quick Answers for Your Team

Q: Is the KVK requirement XBRL or iXBRL? A: Both are supported via SBR. However, IFRS reporters should use iXBRL, while NL GAAP reporters can choose between the strictly structured XBRL or the document-style iXBRL.

Q: When does this apply to me? A: If you are a “Large” legal entity, the mandate kicks in for financial years starting on or after January 1, 2025.

Q: Can we just use PDF? A: No. The “electronic filing” requirement specifically mandates SBR (structured data). PDF is no longer the standard for the statutory filing itself in this context.