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

Every value in 9 rows in column "Own funds requirements" on 25 sheets must be zero or more (OF21.00.01.01, Bank of England check v3779_s)

A blocking check on the market risk: standardised approach for position risk in equities (MKR SA EQU) template (OF21.00.01.01), 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 Market risk: standardised approach for position risk in equities (MKR SA EQU) (OF21.00.01.01): every value in 9 rows (listed below) in column "Own funds requirements" (column 0060) on 25 sheets 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 OF21.00.01 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: standardised approach for position risk in equities (MKR SA EQU) (OF21.00.01.01)

Rows

  • R0010Equities in trading book
  • R0020General risk
  • R0050Specific risk
  • R0090Additional requirements for options (non-delta risks)
  • R0100Simplified method
  • R0110Delta plus approach - additional requirements for gamma risk
  • R0120Delta plus approach - additional requirements for vega risk
  • R0125Delta plus approach - non-continuous options and warrants
  • R0130Scenario matrix approach

Column

  • C0060Own funds requirements

Sheets

  • S0001Total
  • S0004Bulgaria
  • S0006Czech Republic
  • S0007Denmark
  • S0013Hungary
  • S0021Poland
  • S0023Romania
  • S0027Sweden
  • S0028United Kingdom
  • S0029Albania
  • S0030Japan
  • S0031Macedonia
  • S0032Russian Federation
  • S0033Serbia
  • S0034Switzerland
  • S0035Turkey
  • S0036Ukraine
  • S0037USA
  • S0038Norway
  • S0039Egypt
  • S0040Iceland
  • S0041Liechtenstein
  • S0042Other
  • S0043Croatia
  • S0044Euro Area

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:

v3779_s: [OF21.00.01.01 (r0010;0020;0050;0090;0100;0110;0120;0125;0130, c0060, All sheets)] >= 0
Show the formulaShow

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

{t: OF21.00.01.01, r: 0010; 0020; 0050; 0090; 0100; 0110; 0120; 0125; 0130, c: 0060, z: 0001; 0004; 0006; 0007; 0013; 0021; 0023; 0027; 0028; 0029; 0030; 0031; 0032; 0033; 0034; 0035; 0036; 0037; 0038; 0039; 0040; 0041; 0042; 0043; 0044} >= 0

Every PRA banking rule on OF21.00.01.01

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.