CARF XML validator

Validate a CARF report against the OECD CARF XML Schema v1.5 (July 2025) — the version your 31 May 2027 filing must conform to — with every error explained in plain English, not schema-speak. Everything runs locally in your browser: your report file is never uploaded anywhere.

Drop your CARF XML file here, or

Validated locally in your browser against the OECD schema — your file is never uploaded.

New to the schema? Start with The CARF XML schema, explained for humans. Remember: schema-valid is layer one of three — HMRC's business rules and your own ledger reconciliation still apply.