The facts
- Who files
- Credit institutions and stockbroking firms that report through OneGate domain MBS (the NBB reporting and notification portal lists 'Financial reporting' through OneGate for banks and stockbroking firms). The MBS page does not say which institutions file each report. Source
- How often
- Not stated on the NBB pages read; set by the EBA's reporting framework (see eba/corep-lr). Source
- Deadline
- Not stated on the NBB pages read (Domain MBS - XBRL reports page, reporting and notification portal). The reference and remittance dates are set at EU level; see the library's EBA entry eba/corep-lr. Source
- Format
- XBRL-XML, xBRL-CSV. Uploaded to OneGate, domain MBS, using the EBA taxonomy named on the domain page (EBA 4.2 for reference dates from March 2026). xBRL-XML stays accepted, with no end date set, and xBRL-CSV is also possible (14/04/2026 news). The OneGate XBRL protocol (v1.41, April 2026) sets the XML envelope, the xBRL-CSV zip naming convention (for example KBO_0123456789.IND_NBB_MBS_FINREP_FreeText.zip), entity identifiers (KBO or LEI, with .IND or .CON for the level of consolidation) and filing indicators. Access to domain MBS needs an electronic certificate. Source
- How it is filed
- Filing routes recorded for the NBB: OneGate; NBB Supervision. See how firms file with the NBB.
- Status
- In force
- Legal basis
- Group
- Credit institutions and stockbroking firms: capital, liquidity and financial reporting (EU, EBA)
Templates (0)
The library lists no templates for this return.
EU return: the templates and instructions are defined by the EBA. See the library's EBA entry eba/corep-lr (docs/eba/corep-lr.md). Belgian firms use the EBA's templates and taxonomy. Source
Validation rules
The NBB publishes the checks it runs on this return. They could not be counted from the published material. Software can run them exactly as published. Source
How they are written: EBA validation rules in the EBA reporting framework (see the EBA entry); OneGate taxonomy checks.
The rules are the EBA's. OneGate also runs the ECB's data quality checks (EGDQ) on supervisory reports; since the 30/09/2019 reference date every failed EBA validation rule or plausibility check on these reports counts as an error in OneGate, so a report cannot be closed until they are cleared or justified (an EBA Q&A for EBA rules, a justification to the supervisor for ECB checks). A report in which 20% or more of the figures are zeros is blocked; 10% to 20% gives a warning.
How they were counted
Not counted here: the EBA's validation rules apply (see eba/corep-lr).
Counts are in the NBB's own unit, so they are not comparable with other regulators' counts.
Public data
No published data from this return was found. No data from this return published by the NBB was found on the pages checked. Source
Official documents (6)
The NBB's own files, with the size and SHA-256 fingerprint of each as downloaded on 11 November 2026, so anyone can tell whether a copy is the same version.
- Domain MBS - XBRL reports: COREP, FINREP, B2P2,...
List of returns · HTML
Current and former XBRL reports of banks and stockbroking firms in domain MBS, with start and end dates, taxonomy links (EBA for the EU reports), examples and the OneGate XBRL protocol; news on OneGate checks.
- Reporting to OneGate: Technical instructions for file upload to OneGate, domain MBS, XBRL
Filing rules · PDF · 1.3 MB · April 2026
Lists the MBS XBRL reports and sets the OneGate envelope, xBRL-CSV zip naming convention, entity identifiers (KBO or LEI with .IND or .CON extension), schemaRefs, filing indicators and decimals rules.
SHA-256
89f14ff86f05show in full89f14ff86f059ff70e63466e6db1e2c4750d9af592ac0436e27d6027b19925b0 - Reporting and notification portal
List of returns · HTML
The NBB's single page on prudential reporting and notifications by sector: for banks and stockbroking firms, insurers and payment and e-money institutions it lists the periodic reporting (financial reporting through OneGate, qualitative reporting through NBB Supervision) and the platforms.
- OneGate documentation
List of returns · HTML
Index of OneGate domains (AML, CPA, DOR, INS, MBS, MUN, NRA, PAY, PST, REM and others) with the user manuals.
- Circular NBB_2017_27 / Circular on the Bank's expectations as regards quality of reported prudential and financial data
Guidance · HTML · 12 October 2017
- Circular NBB_2017_27: Circular on the Bank's expectations as regards quality of reported prudential and financial data
Guidance · PDF · 55.0 KB · 12 October 2017
SHA-256
7c1a50ef5adcshow in full7c1a50ef5adc2f869836909b429b8667680bdeab2c30b67d44f34b759815f3c3
Sources
Every page and document this return's facts were read from.
- nbb.be/en/reporting/onegate-reporting/general-access-onegate/onegate-documentation/domain-mbs-xbrl-reports-corep-finrep-b2p2
- nbb.be/doc/dd/onegate/data/onegate_xbrl_protocol.pdf
- nbb.be/en/financial-supervision/cross-cutting-and-international-aspects/reporting-and-notification-portal
Knowing exactly what is collected, in what format and under which rules is the first step to real-time supervision. Line4 builds SupTech software for financial regulators that runs checks like these as each return arrives.
Line4's text and records here are free to reuse under CC BY 4.0. Please credit: “Source: Line4 regulatory submissions library (CC BY 4.0), https://www.line4.ai”. The regulators' documents, forms, taxonomies, rules and data belong to them: see NBB's reuse terms. This describes what regulators publish. It is not legal or regulatory advice: always rely on the regulator's own text.
Source: National Bank of Belgium (https://www.nbb.be). Documents copied here are unchanged and are available free of charge on the NBB's website. The plain-English summaries are Line4's own; the NBB does not endorse this library.
Last checked 11 November 2026.
