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

Defaulted risk weighted exposure amount should be less than or equal to the total risk weighted exposure amount (OF08.01.01.01, OF02.00.01.01, Bank of England check boe_b0373)

A blocking check on the credit and counterparty credit risks and free deliveries: IRB approach to capital requirements (CR IRB 1) (OF08.01.01.01) and own funds requirements (CA2) (OF02.00.01.01) templates, 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

defaulted risk weighted exposure amount should be less than or equal to the total risk weighted exposure amount

In each of "Total exposures" (row 0010) and "Exposures assigned to obligor grades or pools: Total" (row 0070) of Credit and counterparty credit risks and free deliveries: IRB approach to capital requirements (CR IRB 1) (OF08.01.01.01): "Of which: defaulted" (column 0265) must not be more than "Risk-weighted exposure amount" (column 0260).

What to do if your return fails it

  1. 01Open the tables below and find the cells the rule reads.
  2. 02Compare the values in your return. If the first is bigger than it may be, one of them is wrong: check both before you change either.
  3. 03The Bank of England allows a small rounding difference, worked out from the decimals each value is reported with.
  4. 04It runs only when your filing indicators mark OF08.01.01 as reported.
  5. 05This is a blocking check. A return that fails it is normally rejected, so fix it before you submit.

The cells it reads

Own funds requirements (CA2) (OF02.00.01.01)

Rows

  • R0271Institutions
  • R0295Corporates - Financial corporates and large corporates
  • R0296Corporates - Other general corporates SME
  • R0297Corporates - Other general corporates non-SME
  • R0310Exposures subject to the AIRB approach
  • R0350Corporates - Specialised lending exposures
  • R0355Corporates - Other general corporates SME
  • R0356Corporates - Other general corporates non-SME
  • R0382Retail - Secured by residential immovable property SME
  • R0383Retail - Secured by residential immovable property non-SME
  • R0384Retail - Secured by commercial immovable property SME
  • R0385Retail - Secured by commercial immovable property non-SME
  • R0390Retail - Qualifying revolving
  • R0400Retail - Other SME
  • R0410Retail - Other non-SME

Column

  • C0010All approaches

Credit and counterparty credit risks and free deliveries: IRB approach to capital requirements (CR IRB 1) (OF08.01.01.01)

Rows

  • R0010Total exposures
  • R0070Exposures assigned to obligor grades or pools: Total

Columns

  • C0260Risk-weighted exposure amount
  • C0265Of which: defaulted

Sheets

  • S0001Total (AIRB approach)
  • S0002Total (FIRB approach and slotting approach)
  • S0006Institutions (FIRB approach)
  • S0009Corporates - Specialised Lending (AIRB approach)
  • S0010Corporates - Specialised Lending (FIRB approach or slotting approach)
  • S0011Corporates - Other general corporates - non-SME (AIRB approach)
  • S0012Corporates - Other general corporates - non-SME (FIRB approach)
  • S0015Retail - Qualifying revolving (AIRB approach)
  • S0016Retail - Other SME (AIRB approach)
  • S0017Retail - Other non-SME (AIRB approach)
  • S0018Retail - Secured by commercial immovable property SME (AIRB approach)
  • S0019Retail - Secured by commercial immovable property non-SME (AIRB approach)
  • S0020Retail - Secured by residential immovable property - SME (AIRB approach)
  • S0021Retail - Secured by residential immovable property non-SME (AIRB approach)
  • S0022Corporates - Financial corporates and large corporates (FIRB approach)
  • S0023Corporates - Other general corporates - SME (AIRB approach)
  • S0024Corporates - Other general corporates - SME (FIRB approach)

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: OF08.01.01.01, c: 0265} <= {t: OF08.01.01.01, c: 0260}

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

scope({t: OF08.01.01.01, r:0010;0070,z:0001;0002;0006;0009;0010;0011;0012;0015;0016;0017;0018;0019;0020;0021;0022;0023;0024, f: banking, fv: banking_reporting})

Every PRA banking rule on OF08.01.01.01

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.