1 min readWarningBank of England taxonomy 2.2.0Updated 11 November 2026

Best estimate assumptions for life insurance risks: data in c0010-c0070 must be blank or > 0 (IR.12.04, Bank of England rule IR_bv1537)

A warning on the best estimate assumptions for life insurance risks template (IR.12.04), in the annual solo (ARS) return.

The rule in plain words

Data in c0010-c0070 must be blank or > 0

What to do if your return fails it

  1. 01Open the table below and find the cells the rule reads.
  2. 02Look for a value of zero or below in these cells.
  3. 03It runs only when your filing indicators mark IR.12.04 as reported.
  4. 04This 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

Best estimate assumptions for life insurance risks [percentage] (IR.12.04.01.01)

Row

  • R0350Subcategory 2

Columns

  • C0010Valuation year Y basis
  • C0020Previous year Y-1 basis
  • C0030Previous year Y-1 experience
  • C0040Previous year Y-2 experience
  • C0050Previous year Y-3 experience
  • C0060Previous year Y-4 experience
  • C0070Previous year Y-5 experience

Which returns it applies to

Line4 Check runs it on annual solo (ARS) return on Bank of England taxonomy 2.2.0. The Bank of England applies it to annual solo (ARS) returns, as a warning.

The Bank’s own words and formula

The plain words above are the Bank of England’s own, word for word, from its list of validations.

Show the formulaShow

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

{t: IR.12.04.01.01, r: R0350} > 0

Every Solvency UK rule on IR.12.04

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.