Is there a CRS XML generator validated against CrsXML_v3.0.xsd?

Yes. AEOIkit generates CRS XML in the OECD Amended CRS Schema v3.0 (namespace urn:oecd:ties:crs:v3), and its output validates against the official CrsXML_v3.0.xsd schema set with zero errors on our test returns. It also checks the business rules that the XSD cannot express, before the file is built. Schema validity is the minimum. A return can pass the XSD and still be rejected.

What XSD validation proves, and what it does not

The XSD checks structure: that the elements are present, in order, with permitted values and formats. It cannot check rules that compare one field with another or with an earlier filing. Examples are which payment types are allowed for an account type, whether a DocRefId has been used before, or whether a correction points to a record that exists. The OECD status-message guidance defines error codes for those rules, and receiving authorities apply them.

What AEOIkit checks

• Checks built from the official OECD CrsXML_v3.0.xsd schema: required elements, order, permitted values and formats. Our test returns validate against the XSD itself with zero errors.
• Business rules from the OECD status-message guidance, such as the payment-type and account-type combinations, duplicate DocRefIds within the file, a missing CorrDocRefId on a correction, and joint-holder counts. AEOIkit cannot see what you filed before, so keep your earlier DocRefIds.
• Cayman conventions for MessageRefId and DocRefId, as in the retired DITC tool.
• Corrections and deletions that reference the records they replace.

Every problem appears in a plain-language list, with the field it belongs to. An automated regression suite runs before every release.

Check it yourself

The file AEOIkit produces is ordinary XML. Your IT team can validate it with any standard XSD validator against the schema files the OECD publishes on its Tax Transparency Resource Centre, which the DITC points filers to (DITC advisory, 17 June 2026).

When the DITC publishes its v3.0 portal rules

The OECD schema is the common base. Jurisdictions may add their own rules. When the DITC publishes its v3.0 portal rules, we will re-validate against them and publish the results. If the tool needs changing, every licensed customer gets the updated copy at no charge.

AEOIkit is independent. The DITC, CIMA and the OECD have not endorsed or approved it. Validation against the OECD schema is a test we run, not a certification.

Sources: OECD, Amended Common Reporting Standard XML Schema: User Guide for Tax Administrations, version 4.0 (CRS schema version 3.0), 2024 · DITC, Industry Advisory: Common Reporting Standard (CRS) and Economic Substance (ES) Updates, 17 June 2026. Last checked 23 October 2026. Dates the DITC gives as “anticipated” may move; check ditc.ky for the latest.

Related answers

• The DITC CRS XML Generator is retired. What now?The DITC no longer provides a CRS XML generator for Schema v3.0. What changed, the dates (portal reopening early 2027, deadline 30 June 2027) and your options.
• How do I create a CRS XML v3.0 return for the DITC portal?Step by step: collect the new v3.0 fields, generate and validate the XML, and upload it to the DITC Portal when CRS submission reopens. Deadline 30 June 2027.
• Is there software that just builds my CRS return for me?AEOIkit builds the CRS XML v3.0 return for you: enter or import the accounts, it checks everything and writes the file for the DITC Portal. No install; data stays on your machine.
• CRS XML generator vs building the XML by handHand-built CRS XML can pass the XSD and still be rejected. A side-by-side of a generator and a hand-built or scripted v3.0 file: setup, checks, corrections, upkeep and cost.
• Is there a CRS XML generator that works on a Mac?AEOIkit runs on a Mac in Safari, Chrome, Edge or Firefox. A single file, with no install, no Excel and no macros, that builds validated CRS XML v3.0 returns for the Cayman DITC portal.
• How do I choose a CRS XML v3.0 tool?The questions to ask any CRS XML v3.0 tool for the amended CRS (sometimes called CRS 2.0) before you buy: schema version, checks, corrections, where your data goes, platform, jurisdiction, pricing and support.

Dates and deadlines in one place: CRS in the Cayman Islands, 2026–2027.