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

Own funds (CA1): "Additional tier 1 capital" must equal the sum of 12 cells (C01.00.01.01, Bank of England check v0182_m)

A blocking check on the own funds (CA1) template (C01.00.01.01), in the own funds (PRA001) return.

Line4 Check runs it on the own funds (PRA001) and capital+ actuals and forecasts (PRA112) returns, proven on test files, check by check: the same outcome on all eleven test files of those returns.

Check your file for this ruleWhat to do if it fails

The rule in plain words

In column "Amount" (0010) of Own funds (CA1) (C01.00.01.01): "Additional tier 1 capital" (row 0530) must equal the sum of 12 cells (listed below).

What to do if your return fails it

  1. 01Open the table 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  3. 03If they differ, a part is missing, a value sits in the wrong cell, or the total is out of date.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 C01.00.01 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 (CA1) (C01.00.01.01)

Rows

  • R0530Additional tier 1 capital
  • R0540Capital instruments eligible as AT1 Capital
  • R0660Transitional adjustments due to grandfathered AT1 Capital instruments
  • R0670Instruments issued by subsidiaries that are given recognition in AT1 Capital
  • R0680Transitional adjustments due to additional recognition in AT1 Capital of instruments issued by subsidiaries
  • R0690(-) Reciprocal cross holdings in AT1 Capital
  • R0700(-) AT1 instruments of financial sector entities where the institution does not have a significant investment
  • R0710(-) AT1 instruments of financial sector entities where the institution has a significant investment
  • R0720(-) Excess of deduction from T2 items over T2 Capital
  • R0730Other transitional adjustments to AT1 Capital
  • R0740Excess of deduction from AT1 items over AT1 Capital (deducted in CET1)
  • R0744(-) Additional deductions of AT1 Capital due to Article 3 CRR
  • R0748AT1 capital elements or deductions - other

Column

  • C0010Amount

Which returns it applies to

Line4 Check runs it on the own funds (PRA001) and capital+ actuals and forecasts (PRA112) returns on Bank of England banking taxonomy 4.1.1. The Bank of England applies it to own funds (PRA001) and capital+ actuals and forecasts (PRA112) returns, as a blocking check.

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:

[v0182_m];[{t: C01.00.01.01, r: 0530, c: 0010} = {t: C01.00.01.01, r: 0540, c: 0010} + {t: C01.00.01.01, r: 0660, c: 0010} + {t: C01.00.01.01, r: 0670, c: 0010} + {t: C01.00.01.01, r: 0680, c: 0010} + {t: C01.00.01.01, r: 0690, c: 0010} + {t: C01.00.01.01, r: 0700, c: 0010} + {t: C01.00.01.01, r: 0710, c: 0010} + {t: C01.00.01.01, r: 0720, c: 0010} + {t: C01.00.01.01, r: 0730, c: 0010} + {t: C01.00.01.01, r: 0740, c: 0010} + {t: C01.00.01.01, r: 0744, c: 0010} + {t: C01.00.01.01, r: 0748, c: 0010}]
Show the formulaShow

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

{t: C01.00.01.01, r: 0530, c: 0010} = {t: C01.00.01.01, r: 0540, c: 0010} + {t: C01.00.01.01, r: 0660, c: 0010} + {t: C01.00.01.01, r: 0670, c: 0010} + {t: C01.00.01.01, r: 0680, c: 0010} + {t: C01.00.01.01, r: 0690, c: 0010} + {t: C01.00.01.01, r: 0700, c: 0010} + {t: C01.00.01.01, r: 0710, c: 0010} + {t: C01.00.01.01, r: 0720, c: 0010} + {t: C01.00.01.01, r: 0730, c: 0010} + {t: C01.00.01.01, r: 0740, c: 0010} + {t: C01.00.01.01, r: 0744, c: 0010} + {t: C01.00.01.01, r: 0748, c: 0010}

The same code in the capital+ actuals and forecasts (PRA112) return: another check

The Bank of England uses v0182_m for a different check in the capital+ actuals and forecasts (PRA112) return. There it is a blocking check on own funds (CA1) (CP01.00.04.01).

In each of 10 columns (listed below) of Own funds (CA1) (CP01.00.04.01): "Additional tier 1 (AT1) capital" (row 0530) must equal the sum of 12 cells (listed below).

Own funds (CA1) (CP01.00.04.01)

Rows

  • R0530Additional tier 1 (AT1) capital
  • R0540Capital instruments eligible as AT1 Capital
  • R0660Transitional adjustments due to grandfathered AT1 Capital instruments
  • R0670Instruments issued by subsidiaries that are given recognition in AT1 Capital
  • R0680Transitional adjustments due to additional recognition in AT1 Capital of instruments issued by subsidiaries
  • R0690(-) Reciprocal cross holdings in AT1 Capital
  • R0700(-) AT1 instruments of financial sector entities where the institution does not have a significant investment
  • R0710(-) AT1 instruments of financial sector entities where the institution has a significant investment
  • R0720(-) Excess of deduction from Tier 2 (T2) items over T2 Capital
  • R0730Other transitional adjustments to AT1 Capital
  • R0740Excess of deduction from AT1 items over AT1 Capital (deducted in CET1)
  • R0744(-) Additional deductions of AT1 Capital due to Article 3 CRR
  • R0748AT1 capital elements or deductions - other

Columns

  • C0010Current reporting month
  • C0020Q1
  • C0030Q2
  • C0040Q3
  • C0050Q4
  • C0060Q5
  • C0070Q6
  • C0080Q7
  • C0090Q8
  • C0100Year-end following Q8

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:

[v0182_m];[scope({t: CP01.00.04.01, c:0010;0020;0030;0040;0050;0060;0070;0080;0090;0100})];[{t: CP01.00.04.01, r: 0530} = {t: CP01.00.04.01, r: 0540} + {t: CP01.00.04.01, r: 0660} + {t: CP01.00.04.01, r: 0670} + {t: CP01.00.04.01, r: 0680} + {t: CP01.00.04.01, r: 0690} + {t: CP01.00.04.01, r: 0700} + {t: CP01.00.04.01, r: 0710} + {t: CP01.00.04.01, r: 0720} + {t: CP01.00.04.01, r: 0730} + {t: CP01.00.04.01, r: 0740} + {t: CP01.00.04.01, r: 0744} + {t: CP01.00.04.01, r: 0748}]
Show the formulaShow

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

{t: CP01.00.04.01, r: 0530} = {t: CP01.00.04.01, r: 0540} + {t: CP01.00.04.01, r: 0660} + {t: CP01.00.04.01, r: 0670} + {t: CP01.00.04.01, r: 0680} + {t: CP01.00.04.01, r: 0690} + {t: CP01.00.04.01, r: 0700} + {t: CP01.00.04.01, r: 0710} + {t: CP01.00.04.01, r: 0720} + {t: CP01.00.04.01, r: 0730} + {t: CP01.00.04.01, r: 0740} + {t: CP01.00.04.01, r: 0744} + {t: CP01.00.04.01, r: 0748}

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

scope({t: CP01.00.04.01, c:0010;0020;0030;0040;0050;0060;0070;0080;0090;0100, f: banking, fv: capital_plus})

Every PRA banking rule on C01.00.01.01

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.