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In forceDeposit-taking institutions: credit risk modelsLast checked 11 November 2026

Retail IRB parameter data (DT4)

A regulatory return listed by the Office of the Superintendent of Financial Institutions (OSFI), Canada.

Supports the monitoring of how well internal ratings-based (IRB) risk parameters perform for retail exposures: backtesting by segment and a portfolio view of the parameters by exposure class. Source

Official title: Retail IRB Credit Parameter Data Call (DT4)

The facts

Who files
OSFI's reporting requirements table lists it for: banks; trust and loan companies; banks or trust and loan companies that are subsidiaries of banks or of federally incorporated trust and loan companies. Not required from: foreign bank branches. Source
How often
Each fiscal quarter. Source
Deadline
Within 30 days. Not subject to the Late and Erroneous Filing Penalties (LEFP) framework. The instructions say: "The return must be completed on a quarterly basis and filed within 30 days of the fiscal quarter end." Source
Format
XML. The instructions say the return "can be submitted through the Regulatory Reporting System (RRS) by uploading a data file in XML." Source
How it is filed
Filing routes recorded for the OSFI: Regulatory Reporting System (RRS); Regulatory Data Hub (RDH). See how firms file with the OSFI.
Status
In forceFiled in the Regulatory Reporting System (RRS). OSFI's Data Collection Modernization initiative will replace RRS with a new platform, the Regulatory Data Hub (RDH); OSFI says the launch is now targeted for spring 2027 and asks filers to keep using RRS until then. Financial filing for banks and trust and loan companies moves to RDH in Release 2; OSFI says more details on financial returns will come in 2027. Source
Legal basis
Group
Deposit-taking institutions: credit risk models

Templates (2)

The tables and forms inside the return. Plain name first, the OSFI's code in brackets.

  • R P Schedule 1 (New) (R_P Schedule 1 (New))
  • R P Schedule 2 (R_P Schedule 2)

Visible worksheets in DT4_2022_BS.xlsx, excluding cover, instruction and list sheets. Source

Validation rules

24 rules, as counted from the OSFI's published material. Software can run them exactly as published. Source

How they are written: Excel workbook, one row per rule (Rule ID, Rule Type, Description and a Formula or Expression column in OSFI's RRS rule syntax, for example If ( Contains( [all /DT4/005/005 Repeat Group/RRS] , [/DT4/010/010 Repeat Group/RRS] ) , t...).

The technical specification (DT4_2022_TS.xlsx) also describes 5 data validation rules in words.

The rules, on osfi-bsif.gc.ca

How they were counted

Counted 24 rows with a rule in the 'Validation rules' sheet of dt4-validation-en.xlsx (24 error).

Counts are in the OSFI's own unit, so they are not comparable with other regulators' counts.

Public data

No published data from this return was found. No publication of data from this return was found on the instructions page or on OSFI's open data pages. Source

Official documents (7)

The OSFI'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.

Sources

Every page and document this return's facts were read from.

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 OSFI's reuse terms. This describes what regulators publish. It is not legal or regulatory advice: always rely on the regulator's own text.

Last checked 11 November 2026.