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

"Positions subject to capital charge" multiplied by 0.08 must equal "Own funds requirements" (OF18.00.01.01, Bank of England check v0578_m)

A warning on the market risk: standardised approach for position risks in traded debt instruments (MKR SA TDI) template (OF18.00.01.01), 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 rule

The rule in plain words

In row "Debt securities under the third category in Table 1" (0310) of Market risk: standardised approach for position risks in traded debt instruments (MKR SA TDI) (OF18.00.01.01): "Positions subject to capital charge" (column 0050) multiplied by 0.08 must equal "Own funds requirements" (column 0060).

This is a warning. It does not stop the return on its own, but your supervisor may ask you to explain it. It runs only when your filing indicators mark OF18.00.01 as reported.

The cells it reads

Market risk: standardised approach for position risks in traded debt instruments (MKR SA TDI) (OF18.00.01.01)

Row

  • R0310Debt securities under the third category in Table 1

Columns

  • C0050Positions subject to capital charge
  • C0060Own funds requirements

Sheets

  • S0001Total
  • S0002Euro
  • S0003Lek
  • S0004Bulgarian Lev
  • S0005Czech Koruna
  • S0006Danish Krone
  • S0007Pound Sterling
  • S0008Forint
  • S0009Yen
  • S0012Denar
  • S0013Zloty
  • S0014Romanian Leu
  • S0015Russian Ruble
  • S0016Serbian Dinar
  • S0017Swedish Krona
  • S0018Swiss Franc
  • S0019Turkish Lira
  • S0020Hryvnia
  • S0021US Dollar
  • S0022Iceland Krona
  • S0023Norwegian Krone
  • S0024Egyptian Pound
  • S0025Other
  • S0026Croatian Kuna

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 warning.

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:

v0578_m: [OF18.00.01.01 (All sheets)] {r0310, c0050} * 0.08 = {r0310, c0060}
Show the formulaShow

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

{t: OF18.00.01.01, r: 0310, c: 0050} * 0.08 = {t: OF18.00.01.01, r: 0310, c: 0060}

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

scope({t: OF18.00.01.01, z:0001;0002;0003;0004;0005;0006;0007;0008;0009;0012;0013;0014;0015;0016;0017;0018;0019;0020;0021;0022;0023;0024;0025;0026, f: banking, fv: banking_reporting})

Every PRA banking rule on OF18.00.01.01

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.