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

Breakdown of credit exposures relevant for the calculation of the countercyclical buffer by country and institution-specific countercyclical buffer rate (CCB): a conditional check (C09.04.01.01, Bank of England check v8730_m)

A warning on the breakdown of credit exposures relevant for the calculation of the countercyclical buffer by country and institution-specific countercyclical buffer rate (CCB) template (C09.04.01.01), 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 ruleWhat to do if it fails

The rule in plain words

In column "Amount" (0010) of 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): if the sum of "Sum of long and short positions of trading book exposures for standardised approaches" (row 0030) and "Value of trading book exposures for internal models" (row 0040) is more than 0, the sum of "Relevant credit exposures - Market risk" (row 0090) must be more than zero.

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 table 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 C09.04.01 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

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)

Rows

  • R0030Sum of long and short positions of trading book exposures for standardised approaches
  • R0040Value of trading book exposures for internal models
  • R0090Relevant credit exposures - Market risk

Column

  • C0010Amount

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:

v8730_m: [C09.04.01.01] if xsum({C09.04.01.01, c0010, (r0030, r0040, sNNN)}) > 0 then sum({C09.04.01.01, r0090, c0010, (sNNN)}) > 0
Show the formulaShow

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

if sum({t: C09.04.01.01, r: 0030; 0040, c: 0010}) > 0 then sum({t: C09.04.01.01, r: 0090, c: 0010}) > 0 else true()

Every PRA banking rule on C09.04.01.01

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.