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

Total outflows due CRM with substitution effects should equal total inflows due to CRM with substitution effects across SA and IRB exposures (C13.01.01.01, OF07.00.01.01, OF08.01.01.01, Bank of England check boe_b0828)

A warning on the credit risk: securitisations (CR SEC) (C13.01.01.01), credit and counterparty credit risks and free deliveries: standardised approach to capital requirements (CR SA) (OF07.00.01.01) and credit and counterparty credit risks and free deliveries: IRB approach to capital requirements (CR IRB 1) (OF08.01.01.01) 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

Total outflows due CRM with substitution effects should equal total inflows due to CRM with substitution effects across SA and IRB exposures

In Credit risk: securitisations (CR SEC) (C13.01.01.01): -1 multiplied by the sum of "Total exposures" in column "(-) Total Outflows" (row 0010, column 0090) on 15 sheets in Credit and counterparty credit risks and free deliveries: standardised approach to capital requirements (CR SA) (OF07.00.01.01) plus the sum of "Total exposures" in column "(-) Total outflows" (row 0010, column 0070) on 15 sheets in Credit and counterparty credit risks and free deliveries: IRB approach to capital requirements (CR IRB 1) (OF08.01.01.01) plus "Total exposures" in column "(-) Unfunded credit protection adjusted values (G*)" (row 0010, column 0030) plus "Total exposures" in column "(-) Total outflows" (row 0010, column 0100) must equal the sum of "Total exposures" in column "Total Inflows (+)" (row 0010, column 0100) on 15 sheets in Credit and counterparty credit risks and free deliveries: standardised approach to capital requirements (CR SA) (OF07.00.01.01) plus the sum of "Total exposures" in column "Total inflows (+)" (row 0010, column 0080) on 15 sheets in Credit and counterparty credit risks and free deliveries: IRB approach to capital requirements (CR IRB 1) (OF08.01.01.01) plus "Total exposures" in column "Total inflows" (row 0010, column 0110).

What to do if your return fails it

  1. 01Open the tables 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 C13.01.01, OF07.00.01 and OF08.01.01 as reported.
  6. 06This is a warning. It does not stop the return on its own, but your supervisor may ask you to explain it.

The cells it reads

Credit risk: securitisations (CR SEC) (C13.01.01.01)

Row

  • R0010Total exposures

Columns

  • C0030(-) Unfunded credit protection adjusted values (G*)
  • C0100(-) Total outflows
  • C0110Total inflows

Credit and counterparty credit risks and free deliveries: standardised approach to capital requirements (CR SA) (OF07.00.01.01)

Row

  • R0010Total exposures

Columns

  • C0090(-) Total Outflows
  • C0100Total Inflows (+)

Sheets

  • S0002Central governments or Central banks
  • S0003Regional governments or local authorities
  • S0004Public sector entities
  • S0005Multilateral development banks
  • S0006International organisations
  • S0007Institutions
  • S0008Corporates
  • S0009Retail
  • S0010Real estate exposures
  • S0011Exposures in default
  • S0012Exposures associated with particularly high risk
  • S0013Eligible covered bonds
  • S0015Exposures in the form of units or shares in collective investment undertakings (‘CIUs’)
  • S0016Subordinated debt, equity and other own funds instruments
  • S0017Other items

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

Row

  • R0010Total exposures

Columns

  • C0070(-) Total outflows
  • C0080Total inflows (+)

Sheets

  • 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 warning.

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}.

-1 * (sum({t: OF07.00.01.01, r: 0010, c: 0090, z: 0002; 0003; 0004; 0005; 0006; 0007; 0008; 0009; 0010; 0011; 0012; 0013; 0015; 0016; 0017}) + sum({t: OF08.01.01.01, r: 0010, c: 0070, z: 0006; 0009; 0010; 0011; 0012; 0015; 0016; 0017; 0018; 0019; 0020; 0021; 0022; 0023; 0024}) + {t: C13.01.01.01, r: 0010, c: 0030} + {t: C13.01.01.01, r: 0010, c: 0100}) = (sum({t: OF07.00.01.01, r: 0010, c: 0100, z: 0002; 0003; 0004; 0005; 0006; 0007; 0008; 0009; 0010; 0011; 0012; 0013; 0015; 0016; 0017}) + sum({t: OF08.01.01.01, r: 0010, c: 0080, z: 0006; 0009; 0010; 0011; 0012; 0015; 0016; 0017; 0018; 0019; 0020; 0021; 0022; 0023; 0024}) + {t: C13.01.01.01, r: 0010, c: 0110})

Every PRA banking rule on C13.01.01.01

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.