1 min readWarningBank of England taxonomy 2.2.0Updated 11 November 2026

Cyber underwriting risk: values reported in the columns should be greater than or equal to zero (IR.21.04, Bank of England rule IR_bv3023)

A warning on the cyber underwriting risk template (IR.21.04), in the annual solo (ARS) and annual third-country branch (ARB) returns.

The rule in plain words

Values reported in the columns should be greater than or equal to zero

What to do if your return fails it

  1. 01Open the table below and find the cells the rule reads.
  2. 02Look for a value below zero in these cells, such as an amount entered as a negative number.
  3. 03It runs only when your filing indicators mark IR.21.04 as reported.
  4. 04This is a warning. It does not stop the return on its own, but your supervisor may ask you to explain it.

The cells it reads

Cyber underwriting risk - risk identification (IR.21.04.01.01)

Columns

  • C0080Sum(s) insured
  • C0090Premium(s)
  • C0100Sum(s) reinsured
  • C0110Number of Claims settled with Payment
  • C0120Amount of Gross Claims Paid - Total
  • C0121Amount of Gross Claims Paid - First Party
  • C0122Amount of Gross Claims Paid - Third Party
  • C0123Amount of Gross Claims Paid - Costs & Expenses
  • C0130Number of Claims settled without payment
  • C0140Gross undiscounted best estimate provision for claims outstanding - Total
  • C0141Gross undiscounted best estimate provision for claims outstanding - First Party
  • C0142Gross undiscounted best estimate provision for claims outstanding - Third Party
  • C0143Gross undiscounted best estimate provision for claims outstanding - Costs & Expenses

Which returns it applies to

Line4 Check runs it on annual solo (ARS) and annual third-country branch (ARB) returns on Bank of England taxonomy 2.2.0. The Bank of England applies it to annual solo (ARS) and annual third-country branch (ARB) returns, as a warning.

The Bank’s own words and formula

The plain words above are the Bank of England’s own, word for word, from its list of validations.

Show the formulaShow

The Bank of England's formula. Cells are written as {t: table, r: row, c: column}.

{t: IR.21.04.01.01, c: C0080; C0090; C0100; C0110; C0120; C0121; C0122; C0123; C0130; C0140; C0141; C0142; C0143} >= 0

Every Solvency UK rule on IR.21.04

Checks like this one, run at the point of submission, are the first step to real-time supervision. Line4 builds SupTech software for financial regulators that runs checks like these as each return arrives.