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

Own funds for SDDTs (CA1 SDDT): tier 1 must equal CET1 + AT1 (SC01.00.03.01, Bank of England check boe_b0014_ss)

A blocking check on the own funds for SDDTs (CA1 SDDT) template (SC01.00.03.01), in the capital+ forecast annual for SDDTs and SDDT consolidation entities (PRA118) return.

Line4 Check runs it on the capital+ forecast annual for SDDTs and SDDT consolidation entities (PRA118) return, proven on test files, check by check: the same outcome on all eight test files of that return.

Check your file for this ruleWhat to do if it fails

The rule in plain words

Tier 1 must equal CET1 + AT1

In each of "Q4" (column 0050), "Q8" (column 0090) and "Year-end following Q8" (column 0100) of Own funds for SDDTs (CA1 SDDT) (SC01.00.03.01): "Tier 1 capital" (row 0015) must equal the sum of "Common equity tier 1 capital" (row 0020) and "Additional tier 1 capital" (row 0530).

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  3. 03If they differ, a part is missing, a value sits in the wrong cell, or the total is out of date.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 SC01.00.03 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 for SDDTs (CA1 SDDT) (SC01.00.03.01)

Rows

  • R0015Tier 1 capital
  • R0020Common equity tier 1 capital
  • R0530Additional tier 1 capital

Columns

  • C0050Q4
  • C0090Q8
  • C0100Year-end following Q8

Which returns it applies to

Line4 Check runs it on the capital+ forecast annual for SDDTs and SDDT consolidation entities (PRA118) return on Bank of England banking taxonomy 4.1.1. The Bank of England applies it to capital+ forecast annual for SDDTs and SDDT consolidation entities (PRA118) 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: SC01.00.03.01, r: 0015} = sum({t: SC01.00.03.01, r: 0020; 0530})

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

scope({t: SC01.00.03.01, c:0050;0090;0100, f: banking, fv: capital_plus_sddt})

Every PRA banking rule on SC01.00.03.01

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.