Line4

In forceMortgage insurers: financial statementsLast checked 11 November 2026

Mortgage insurer supervisory quarterly return (MI4)

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

Supporting supervisory exhibits for mortgage insurers: investments, other assets and liabilities, reinsurance ceded, expenses and other income, non-consolidated financial statements, insurance service result and the provincial and territorial exhibit. Source

Official title: MI Supervisory Quarterly Return (MI4)

The facts

Who files
OSFI's reporting requirements tables list it for: Canadian mortgage insurers. Source
How often
Quarterly, plus an annual filing at year end. Source
Deadline
Quarterly filing: within 45 days. Annual filing: within 60 days. Subject to the Late and Erroneous Filing Penalties (LEFP) framework. Source
Format
XML, Excel. OSFI's federal filing requirements table (Section V) marks this filing as: XML file: Yes; special Excel file (OSFI973): Yes. 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 forceOSFI has published 2027 versions of the insurer returns for IFRS 18. The 2027 pages say insurers with a December 31, 2026 year end use the new returns from January 1, 2027, and those with an October 31, 2027 year end from November 1, 2027. Filed 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 insurers moves to RDH in Release 3; OSFI says more details on financial returns will come in 2027. Source
Group
Mortgage insurers: financial statements

Templates (27)

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

  • Other Information (10.41)
  • Summary of Investments (40.08)
  • Interest Revenue on Financial Assets (40.72)
  • Investment Return (excluding Interest Revenue) (40.74)
  • Other Loans (40.80)
  • Analysis of Current Year Provisions (40.88)
  • Provisions, Accruals & Other Liabilities (40.92)
  • Intra-Group Transactions (50.32)
  • Receivable from/Payable to (50.40)
  • Insurance Service Result and Onerous Contracts (60.200)
  • Provincial and Territorial Exhibits (67.200)
  • Reinsurance Contracts Held Summary - Registered Reinsurance (70.50)
  • Insurance Service and Other Operating Expenses (80.25)
  • Other Income (80.35)
  • Assets (92.10)
  • Liabilities and Equity (92.11)
Show all 27 templates
  • Liability Roll Forward (Analysis by measurement component (Insurance contracts not measured under the PAA - excluding Segregated Funds)) (92.12)
  • Liability Roll Forward (Analysis by remaining coverage and incurred claims (all insurance contracts - excluding Segregated Funds)) (92.14)
  • Liability Roll Forward (Reinsurance contracts held analysis by measurement component (Contracts not measured under the PAA - excluding Segregated Funds)) (92.16)
  • Liability Roll Forward (Reinsurance contracts held analysis by remaining coverage and incurred claims (all contracts - excluding Segregated Funds)) (92.18)
  • Statement of Profit or Loss (92.22)
  • Reserves (92.40)
  • Comprehensive Income(Loss) & Accumulated Other Comprehensive Income(Loss) (92.42)
  • Statement of Changes in Equity (92.54)
  • Insurance Service Result (93.14)
  • Premiums Written (93.30)
  • Provincial and Territorial Exhibits (94.000)

Schedules (worksheets) in mi4-2024-en.xlsx, named from the workbook's table of contents or schedule titles. Source

Validation rules

1,187 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 EqualWithinThreshold([P400831035],[P408015904],1,0)).

The validation rules published for the next (2027) version, mi4-2027-q1-t1-09-11-2026-validation-en.xlsx, list 1207 rules.

The rules, on osfi-bsif.gc.ca

How they were counted

Counted 1187 rows with a rule in the 'Validation rules' sheet of mi4-validation-2026-03-13-en.xlsx (1187 error).

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

Public data

Published firm by firm. OSFI publishes data from this return institution by institution, with industry totals, as CSV files on the Government of Canada open data portal: "MI4 - Mortgage Insurers Supervisory Quarterly Return (Active)" in the Property and casualty companies dataset. Source

Where it is published (CSV)

  • OSFI financial data: Property and casualty companies (open.canada.ca)

    Firm by firm · CSV (long format: one row per institution, period and data point address, with English and French labels)

    Institution-by-institution data, with industry totals, from OSFI's returns for property and casualty companies, one CSV file per return: MI -Mortgage Insurance Capital Adequacy Test (Active); MI3 - Mortgage Insurers Core Financial Statement Return (Active); MI4 - Mortgage Insurers Supervisory Quarterly Return (Active); MI5 - Mortgage Insurers Supervisory Annual Return (Active); PC1 - P&C Core Financial Statement Return (Active); PC2 - P&C Supervisory Quarterly Return (Active); PC3 - P&C Supervisory Annual Return (Active); PC4 - P&C Minimum Capital Test and Branch Adequacy of Assets Test (Active). The dataset is updated quarterly (last updated on the portal 2026-10-21) and also holds 6 CSV files for returns OSFI no longer collects, a data dictionary and a user manual. The dataset page gives 2026 publication dates: monthly returns on or about the 15th of each month; quarterly returns about a week after the due date (Q1 due May 15, published May 23; Q2 due Aug 14, published Aug 22; Q3 due Nov 14, published Nov 22; Q4 due March 1, published March 19). Source

Official documents (27)

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.