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

Own funds requirements (CA2): a conditional check (OF02.00.01.01, OF02.01.01.03, C03.00.01.01 and others, Bank of England check boe_b0561)

A blocking check on the own funds requirements (CA2) (OF02.00.01.01), output floor - Total RWA (OFL) (OF02.01.01.03), capital adequacy - capital ratios (CA3) (C03.00.01.01) and capital adequacy - memorandum items (CA4) (C04.00.01.01) 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

This is the overall capital requirements ratio for CET1 capital (row 0170) calculated by using as parameters the largest of either c0030 (if c0030 is greater than c0010) or otherwise 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), if "Total risk exposure amount" in column "Output Floor" (row 0010, column 0030) is not zero, "OCR: to be made up of CET1 capital" in column "Amount" (row 0170, column 0010) in Capital adequacy - capital ratios (CA3) (C03.00.01.01) must equal the larger of 0.045 and "TSCR: to be made up of CET1 capital1080" in column "Amount" (row 0140, column 0010) in Capital adequacy - capital ratios (CA3) (C03.00.01.01) plus "Combined Buffer Requirement" in column "Amount" (row 0740, column 0010) in Capital adequacy - memorandum items (CA4) (C04.00.01.01) divided by "Total risk exposure amount" in column "Output Floor" (row 0010, column 0030); otherwise if "Total risk exposure amount" in column "All approaches" (row 0010, column 0010) is not zero, "OCR: to be made up of CET1 capital" in column "Amount" (row 0170, column 0010) in Capital adequacy - capital ratios (CA3) (C03.00.01.01) must equal the larger of 0.045 and "TSCR: to be made up of CET1 capital1080" in column "Amount" (row 0140, column 0010) in Capital adequacy - capital ratios (CA3) (C03.00.01.01) plus "Combined Buffer Requirement" in column "Amount" (row 0740, column 0010) in Capital adequacy - memorandum items (CA4) (C04.00.01.01) divided 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 C03.00.01, C04.00.01 and OF02.00.01 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

Capital adequacy - capital ratios (CA3) (C03.00.01.01)

Rows

  • R0140TSCR: to be made up of CET1 capital1080
  • R0170OCR: to be made up of CET1 capital

Column

  • C0010Amount

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

Row

  • R0740Combined Buffer Requirement

Column

  • C0010Amount

Own funds requirements (CA2) (OF02.00.01.01)

Row

  • R0010Total risk exposure amount

Columns

  • C0010All approaches
  • C0030Output Floor

Output floor - Total RWA (OFL) (OF02.01.01.03)

Row

  • R0080Total

Column

  • C0030Total RWA (U-TREA)

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}.

if ({t: OF02.00.01.01, r: 0010, c: 0030} > {t: OF02.00.01.01, r: 0010, c: 0010}) then (if {t: OF02.00.01.01, r: 0010, c: 0030} != 0 then {t: C03.00.01.01, r: 0170, c: 0010} = max(0.045, {t: C03.00.01.01, r: 0140, c: 0010} + {t: C04.00.01.01, r: 0740, c: 0010} / {t: OF02.00.01.01, r: 0010, c: 0030}) else true()) else (if {t: OF02.00.01.01, r: 0010, c: 0010} != 0 then {t: C03.00.01.01, r: 0170, c: 0010} = max(0.045, {t: C03.00.01.01, r: 0140, c: 0010} + {t: C04.00.01.01, r: 0740, c: 0010} / {t: OF02.00.01.01, r: 0010, c: 0010}) else true())

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.