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

Own funds requirements (CA2): a conditional check (OF02.00.01.01, C04.00.01.01, C09.04.01.01, Bank of England check boe_b0565)

A warning on the own funds requirements (CA2) (OF02.00.01.01), capital adequacy - memorandum items (CA4) (C04.00.01.01) and breakdown of credit exposures relevant for the calculation of the countercyclical buffer by country and institution-specific countercyclical buffer rate (CCB) (C09.04.01.01) 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

Institution specific countercyclical capital buffer amount is equal to countercyclical capital buffer rate multiplied by c0030 if it’s greater than c0010, otherwise it’s multiplied by Total Risk exposure amount c0010

In Own funds requirements (CA2) (OF02.00.01.01): if "Total risk exposure amount" in column "Output Floor" (row 0010, column 0030) is more than "Total risk exposure amount" in column "All approaches" (row 0010, column 0010), "Institution specific countercyclical capital buffer" in column "Amount" (row 0770, column 0010) in Capital adequacy - memorandum items (CA4) (C04.00.01.01) must equal "Institution-specific countercyclical capital buffer rate" in column "Percentage" (row 0140, column 0020) (where residence of the immediate obligor is "All countries") in Breakdown of credit exposures relevant for the calculation of the countercyclical buffer by country and institution-specific countercyclical buffer rate (CCB) (C09.04.01.01) multiplied by "Total risk exposure amount" in column "Output Floor" (row 0010, column 0030); otherwise "Institution specific countercyclical capital buffer" in column "Amount" (row 0770, column 0010) in Capital adequacy - memorandum items (CA4) (C04.00.01.01) must equal "Institution-specific countercyclical capital buffer rate" in column "Percentage" (row 0140, column 0020) (where residence of the immediate obligor is "All countries") in Breakdown of credit exposures relevant for the calculation of the countercyclical buffer by country and institution-specific countercyclical buffer rate (CCB) (C09.04.01.01) multiplied by "Total risk exposure amount" in column "All approaches" (row 0010, column 0010).

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 tables below and find the cells the rule reads.
  2. 02The check applies only when its first part holds in your return. When it does, the second part must hold too: fix the second part, or correct the first.
  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 C04.00.01, C09.04.01 and OF02.00.01 as reported.
  5. 05This 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

Capital adequacy - memorandum items (CA4) (C04.00.01.01)

Row

  • R0770Institution specific countercyclical capital buffer

Column

  • C0010Amount

Breakdown of credit exposures relevant for the calculation of the countercyclical buffer by country and institution-specific countercyclical buffer rate (CCB) (C09.04.01.01)

Row

  • R0140Institution-specific countercyclical capital buffer rate

Column

  • C0020Percentage

Own funds requirements (CA2) (OF02.00.01.01)

Row

  • R0010Total risk exposure amount

Columns

  • C0010All approaches
  • C0030Output Floor

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}.

if ({t: OF02.00.01.01, r: 0010, c: 0030} > {t: OF02.00.01.01, r: 0010, c: 0010}) then ({t: C04.00.01.01, r: 0770, c: 0010} = {t: C09.04.01.01, r: 0140, c: 0020, filter: [eba_dim:RIO] = [eba_GA:x1]} * {t: OF02.00.01.01, r: 0010, c: 0030}) else ({t: C04.00.01.01, r: 0770, c: 0010} = {t: C09.04.01.01, r: 0140, c: 0020, filter: [eba_dim:RIO] = [eba_GA:x1]} * {t: OF02.00.01.01, r: 0010, c: 0010})

Every PRA banking rule on OF02.00.01.01

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.