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

Market risk: internal models (MKR IM): values must agree (C24.00.01.01, Bank of England check v0635_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

In row "Total positions" (0010) of Market risk: internal models (MKR IM) (C24.00.01.01): "FLOOR" (column 0090) must equal the larger of "Assumed charge for ctp floor - weighted net long positions after cap" (column 0170) and "Assumed charge for ctp floor - weighted net short positions after cap" (column 0180) multiplied by 0.08.

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.

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

  • C0090FLOOR
  • C0170Assumed charge for ctp floor - weighted net long positions after cap
  • C0180Assumed charge for ctp floor - weighted net short positions after cap

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 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:

[v0635_m];[{t: C24.00.01.01, r: 0010, c: 0090} = max({t: C24.00.01.01, r: 0010, c: 0170}, {t: C24.00.01.01, r: 0010, c: 0180}) * 0.08]
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: 0090} = max({t: C24.00.01.01, r: 0010, c: 0170}, {t: C24.00.01.01, r: 0010, c: 0180}) * 0.08

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.