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

Market risk: internal models (MKR IM): market Risk positions shall exceed or be equal to zero (C24.00.01.01, Bank of England check v3793_s)

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 positions shall exceed or be equal to zero

In Market risk: internal models (MKR IM) (C24.00.01.01): every value in the cells it covers must be zero or more.

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 C24.00.01 as reported.
  4. 04This is a blocking check. A return that fails it is normally rejected, so fix it before you submit.

The cells it reads

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

Rows

  • R0010Total positions
  • R0020Traded debt instruments
  • R0030TDI - General risk
  • R0040TDI - Specific risk
  • R0050Equities
  • R0060Equities - General risk
  • R0070Equities - Specific risk
  • R0080Foreign Exchange risk
  • R0090Commodities risk
  • R0100Total amount for general risk
  • R0110Total amount for specific risk

Columns

  • C0030Multiplication factor (mc) x average of previous 60 working days (VaRavg)
  • C0040Previous day (VaRt-1)
  • C0050Multiplication factor (ms) x average of previous 60 working days (SVaRavg)
  • C0060Latest available (SVaRt-1)

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} >=0

Where it applies, in the Bank's words (its scope):

scope({t: C24.00.01.01, r:0010;0020;0030;0040;0050;0060;0070;0080;0090;0100;0110,c:0030;0040;0050;0060, f: banking, fv: banking_reporting})

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.