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

Market risk: standardised approach for position risk in equities (MKR SA EQU): a total must equal the sum of its parts (OF21.00.01.01, Bank of England check v0004_h)

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.

Check your file for this ruleWhat to do if it fails

The rule in plain words

In column "Own funds requirements" (0060) of Market risk: standardised approach for position risk in equities (MKR SA EQU) (OF21.00.01.01): "Additional requirements for options (non-delta risks)" (row 0090) must equal the sum of "Simplified method" (row 0100), "Delta plus approach - additional requirements for gamma risk" (row 0110), "Delta plus approach - additional requirements for vega risk" (row 0120), "Scenario matrix approach" (row 0130) and "Delta plus approach - non-continuous options and warrants" (row 0125).

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. 02Add up the parts in your return and compare the result with the total.
  3. 03If they differ, a part is missing, a value sits in the wrong cell, or the total is out of date.
  4. 04The Bank of England allows a small rounding difference, worked out from the decimals each value is reported with.
  5. 05It runs only when your filing indicators mark OF21.00.01 as reported.
  6. 06This 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

  • 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

A worked example

With simple numbers.

Illustrative values
Simplified method1,200
Delta plus approach - additional requirements for gamma risk800
Delta plus approach - additional requirements for vega risk450
Scenario matrix approach300
Delta plus approach - non-continuous options and warrants150
Together2,900
What the rule then expects

Additional requirements for options (non-delta risks) must then be 2,900.

2,900Passes
3,000Fails

A file that reports 2,900 passes. One that reports 3,000 fails, by 100.

The numbers are illustrative, reported to the unit, so the rounding tolerance does not change the result.

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:

v0004_h: [OF21.00.01.01 (c0060, All sheets)] {r0090} = +{r0100} + {r0110} + {r0120} + {r0130} + {r0125}
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: 0090, c: 0060} = {t: OF21.00.01.01, r: 0100, c: 0060} + {t: OF21.00.01.01, r: 0110, c: 0060} + {t: OF21.00.01.01, r: 0120, c: 0060} + {t: OF21.00.01.01, r: 0130, c: 0060} + {t: OF21.00.01.01, r: 0125, c: 0060}

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

scope({t: OF21.00.01.01, 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, f: banking, fv: banking_reporting})

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.