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

Market risk: internal model approach 1B (MKR IMA1B): a value must not be more than another (OF24.02.01.01, OF700.00.01.01, Bank of England check boe_b0901)

A blocking check on the market risk: internal model approach 1B (MKR IMA1B) (OF24.02.01.01) and general information (OF700.00.01.01) 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.

The rule in plain words

The SS observation start date for the NMRF stress scenario must be earlier (more in the past) than the reporting period start date for this submission

In Market risk: internal model approach 1B (MKR IMA1B) (OF24.02.01.01): 5 rows (listed below) in column "Start period" (column 0090) must not be more than "Reporting period start date" in column "Header info" (row 0040, column 0010) in General information (OF700.00.01.01).

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. 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. 03It runs only when your filing indicators mark OF24.02.01 and OF700.00.01 as reported.
  4. 04This is a blocking check. A return that fails it is normally rejected, so fix it before you submit.

The cells it reads

Market risk: internal model approach 1B (MKR IMA1B) (OF24.02.01.01)

Rows

  • R0020General interest rate risk (GIRR)
  • R0030Credit spread risk (CSR)
  • R0040Equity risk (EQU)
  • R0050Commodity risk (COM)
  • R0060Foreign exchange risk (FX)

Column

  • C0090Start period

General information (OF700.00.01.01)

Row

  • R0040Reporting period start date

Column

  • C0010Header info

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: OF24.02.01.01, r: 0020; 0030; 0040; 0050; 0060, c: 0090} <= {t: OF700.00.01.01, r: 0040, c: 0010}

Every PRA banking rule on OF24.02.01.01

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.