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1 min readWarningBank of England banking taxonomy 4.1.1Updated 11 November 2026

Market risk: internal models (MKR IM): two values must match (C24.00.01.01, Bank of England check v3346_i)

A warning on the market risk: internal models (MKR IM) template (C24.00.01.01), in the own funds (PRA001) return.

Line4 Check runs it on the own funds (PRA001) return, proven on test files, check by check: the same outcome on all three test files of that return.

Check your file for this ruleWhat to do if it fails

The rule in plain words

In Market risk: internal models (MKR IM) (C24.00.01.01): "Total positions" in column "Total risk exposure amount" (row 0010, column 0130) must equal "Risk exposure amount for position, foreign exchange and commodities risks under internal model approach (IMA) - for IMA desks only" in column "All approaches" (row 0580, column 0010) in Own funds requirements (CA2) (OF02.00.01.01).

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 table below and find the cells the rule reads.
  2. 02The two values must be the same. Find which of the two is right, and correct the other one.
  3. 03It runs only when your filing indicators mark C24.00.01 and OF02.00.01 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

Market risk: internal models (MKR IM) (C24.00.01.01)

Row

  • R0010Total positions

Column

  • C0130Total risk exposure amount

Which returns it applies to

Line4 Check runs it on the own funds (PRA001) return on Bank of England banking taxonomy 4.1.1. The Bank of England applies it to own funds (PRA001) returns, as a warning.

The Bank’s own words and formula

The plain words above spell out the Bank’s formula, with each cell named from its templates. In the Bank of England’s list of validations, word for word:

[v3346_i];[{t: C24.00.01.01, r: 0010, c: 0130} = {t: OF02.00.01.01, r: 0580, c: 0010}]
Show the formulaShow

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

{t: C24.00.01.01, r: 0010, c: 0130} = {t: OF02.00.01.01, r: 0580, c: 0010}

Every PRA banking rule on C24.00.01.01

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.