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

Market risk: internal models (MKR IM): market Risk Total risk exposure amount shall be equal to 12.5 * Capital Requirements (C24.00.01.01, Bank of England check v0636_m)

A blocking check 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.

The rule in plain words

Market Risk Total risk exposure amount shall be equal to 12.5 * Capital Requirements

In row "Total positions" (0010) of Market risk: internal models (MKR IM) (C24.00.01.01): "Total risk exposure amount" (column 0130) must equal "Own funds requirements" (column 0120) multiplied by 12.5.

This is a blocking check. A return that fails it is normally rejected, so fix it before you submit. It runs only when your filing indicators mark C24.00.01 as reported.

The cells it reads

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

Row

  • R0010Total positions

Columns

  • C0120Own funds requirements
  • 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 blocking check.

The Bank’s own words and formula

The first paragraph of the plain words above is the Bank of England’s own, word for word, from its list of validations. The second spells out its formula, with each cell named from its templates.

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: C24.00.01.01, r: 0010, c: 0120} * 12.5

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.