Line4

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

Values of data points in the 'Total FIRB and slotting' sheet should equal the sum of the (non-Total) FIRB sheets for the columns listed (OF08.01.01.01, OF02.00.01.01, Bank of England check boe_b0749)

A blocking check on the credit and counterparty credit risks and free deliveries: IRB approach to capital requirements (CR IRB 1) (OF08.01.01.01) and own funds requirements (CA2) (OF02.00.01.01) 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

Values of data points in the 'Total FIRB and slotting' sheet should equal the sum of the (non-Total) FIRB sheets for the columns listed

In each of 25 columns (listed below) of Credit and counterparty credit risks and free deliveries: IRB approach to capital requirements (CR IRB 1) (OF08.01.01.01): "Total exposures" (row 0010) on sheet "Total (FIRB approach and slotting approach)" (sheet 0002) must equal the sum of "Total exposures" (row 0010) on sheet "Institutions (FIRB approach)" (sheet 0006), "Total exposures" (row 0010) on sheet "Corporates - Specialised Lending (FIRB approach or slotting approach)" (sheet 0010), "Total exposures" (row 0010) on sheet "Corporates - Financial corporates and large corporates (FIRB approach)" (sheet 0022), "Total exposures" (row 0010) on sheet "Corporates - Other general corporates - SME (FIRB approach)" (sheet 0024) and "Total exposures" (row 0010) on sheet "Corporates - Other general corporates - non-SME (FIRB approach)" (sheet 0012).

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  3. 03If they differ, a part is missing, a value sits in the wrong cell, or the total is out of date.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 OF08.01.01 as reported.
  6. 06This is a blocking check. A return that fails it is normally rejected, so fix it before you submit.

The cells it reads

Own funds requirements (CA2) (OF02.00.01.01)

Rows

  • R0271Institutions
  • R0295Corporates - Financial corporates and large corporates
  • R0296Corporates - Other general corporates SME
  • R0297Corporates - Other general corporates non-SME

Columns

  • C0010All approaches
  • C0020Standardised approaches only (Output Floor)

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

Row

  • R0010Total exposures

Columns

  • C0020Original exposure pre-conversion factors
  • C0030Of which: large financial sector entities and unregulated financial sector entities
  • C0035(-) Adjustment to exposure value due to on-balance sheet netting
  • C0040(-) Guarantees
  • C0050(-) Credit derivatives
  • C0060(-) Other funded credit protection
  • C0070(-) Total outflows
  • C0080Total inflows (+)
  • C0090Exposure after CRM substitution effects pre-conversion factors
  • C0110Exposure value
  • C0140Of which: large financial sector entities and unregulated financial sector entities
  • C0170Other funded credit protection
  • C0180Eligible financial collateral
  • C0190Real estate
  • C0200Other physical collateral
  • C0210Receivables
  • C0251Risk-weighted exposure amount pre-adjustments
  • C0260Risk-weighted exposure amount
  • C0270Of which: large financial sector entities and unregulated financial sector entities
  • C0275Non-modelled approaches exposure value
  • C0276Non-modelled approaches risk-weighted exposure value
  • C0280Expected loss amount pre post- model adjustments
  • C0281Adjustment to expected loss amount due to post- model adjustments
  • C0282Expected loss amount after post- model adjustments
  • C0290(-) Value adjustments and provisions

Sheets

  • S0002Total (FIRB approach and slotting approach)
  • S0006Institutions (FIRB approach)
  • S0010Corporates - Specialised Lending (FIRB approach or slotting approach)
  • S0012Corporates - Other general corporates - non-SME (FIRB approach)
  • S0022Corporates - Financial corporates and large corporates (FIRB approach)
  • S0024Corporates - Other general corporates - SME (FIRB approach)

A worked example

With simple numbers.

Illustrative values
Total exposures1,200
Total exposures800
Total exposures450
Total exposures300
Total exposures150
Together2,900
What the rule then expects

Total exposures must then be 2,900.

2,900Passes
3,000Fails

A file that reports 2,900 passes. One that reports 3,000 fails, by 100.

The numbers are illustrative, reported to the unit, so the rounding tolerance does not change the result.

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: OF08.01.01.01, r: 0010, z: 0002} = {t: OF08.01.01.01, r: 0010, z: 0006} + {t: OF08.01.01.01, r: 0010, z: 0010} + {t: OF08.01.01.01, r: 0010, z: 0022} + {t: OF08.01.01.01, r: 0010, z: 0024} + {t: OF08.01.01.01, r: 0010, z: 0012}

Where it applies, in the Bank's words (its scope):

scope({t: OF08.01.01.01, c:0020;0030;0035;0040;0050;0060;0070;0080;0090;0110;0140;0170;0180;0190;0200;0210;0251;0260;0270;0275;0276;0280;0281;0282;0290, f: banking, fv: banking_reporting})

Every PRA banking rule on OF08.01.01.01

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.