2 min readBlockingBank of England taxonomy 2.2.0Updated 11 November 2026

Solvency capital requirement - non-life and health catastrophe risk: a total must equal the sum of its parts (IR.27.01, Bank of England rule IR_bv0657)

A blocking check on the solvency capital requirement - non-life and health catastrophe risk template (IR.27.01), in the annual solo (ARS) return.

The rule in plain words

The item "Catastrophe Risk Charge Credit & Suretyship before risk mitigation/Total before diversification" reported in Solvency Capital Requirement - Non-life and Health catastrophe risk (IR.27.01) should be equal to the sum of "Catastrophe Risk Charge Credit & Surety before risk mitigation - Large Credit Default/Total" and "Catastrophe Risk Charge Credit & Suretyship before risk mitigation - Recession Risk/Total" reported above

The headline gives only the template and the kind of check, because the rule is too long to say in a headline. The plain words above say all of it.

What to do if your return fails it

  1. 01Open the tables below and find the cells the rule reads.
  2. 02Add up the parts in your return and compare the result with the total.
  3. 03If they differ, a part is missing, a value sits in the wrong cell, or the total is out of date.
  4. 04The Bank of England allows a small rounding difference, worked out from the decimals each value is reported with.
  5. 05It runs only when your filing indicators mark IR.27.01 as reported.
  6. 06This is a blocking check. A return that fails it is normally rejected, so fix it before you submit.

The cells it reads

Solvency capital requirement - non-life and health catastrophe risk: man made catastrophe risk - credit & suretyship - large credit default (IR.27.01.01.16)

Row

  • R2920Total

Column

  • C1010Catastrophe Risk Charge Credit & Surety before risk mitigation - Large Credit Default

Solvency capital requirement - non-life and health catastrophe risk: man made catastrophe risk - credit & suretyship - recession risk (IR.27.01.01.17)

Row

  • R3000Total

Column

  • C1060Catastrophe Risk Charge Credit & Suretyship before risk mitigation - Recession Risk

Solvency capital requirement - non-life and health catastrophe risk: man made catastrophe risk - credit & suretyship (IR.27.01.01.18)

Row

  • R3100Total before diversification

Column

  • C1100Catastrophe Risk Charge Credit & Suretyship before risk mitigation

A worked example

With simple numbers.

Illustrative values
Total, Catastrophe Risk Charge Credit & Surety before risk mitigation - Large Credit Default1,200
Total, Catastrophe Risk Charge Credit & Suretyship before risk mitigation - Recession Risk800
Together2,000
What the rule then expects

Total before diversification, Catastrophe Risk Charge Credit & Suretyship before risk mitigation must then be 2,000.

2,000Passes
2,100Fails

A file that reports 2,000 passes. One that reports 2,100 fails, by 100.

The numbers are illustrative, reported to the unit, so the rounding tolerance does not change the result.

Which returns it applies to

Line4 Check runs it on annual solo (ARS) return on Bank of England taxonomy 2.2.0. The Bank of England applies it to annual solo (ARS) returns, as a blocking check.

The Bank’s own words and formula

In the Bank of England’s list of validations, word for word:

The item "Catastrophe Risk Charge Credit & Suretyship before risk mitigation/Total before diversification" reported in IR.27.01 - Solvency Capital Requirement - Non-life and Health catastrophe risk should be equal to the sum of "Catastrophe Risk Charge Credit & Surety before risk mitigation - Large Credit Default/Total" and "Catastrophe Risk Charge Credit & Suretyship before risk mitigation - Recession Risk/Total" reported above.
Show the formulaShow

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

{t: IR.27.01.01.18, r: R3100, c: C1100, z: Z0001} = {t: IR.27.01.01.16, r: R2920, c: C1010, z: Z0001} + {t: IR.27.01.01.17, r: R3000, c: C1060, z: Z0001}

Every Solvency UK rule on IR.27.01

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.