Data sources

Manually curated: updated by hand when the issuing body announces a change.

Update trigger: MoJ/CFO rate announcement on GOV.UK — append a row to the JSON.

Changes are infrequent and announced; the review threshold is a backstop.

Manually curated: updated by hand when the issuing body announces a change.

Update trigger: MPC rate decision — append a row to the JSON. The Late Payment calculator derives its statutory reference rate (base rate on 31 Dec / 30 Jun) from this same series.

Manually curated: updated by hand when the issuing body announces a change.

Update trigger: MoJ/CFO rate announcement on GOV.UK — append a row to the JSON. Coverage starts 29 Apr 2022; earlier dates get a clear no-data message.

Script-refreshed: a maintained script re-pulls the full published series.

Update trigger: Monthly ONS RPI print (mid-month) — run scripts/refresh-rpi-data.mjs, which rewrites the JSON from the full published series.

Manually curated: updated by hand when the issuing body announces a change.

Update trigger: Annual NJC pay settlement — update the year row; aggregate and day-aggregate rates are fixed multiples (×1.3138 / ×1.2142) of basic.

The 2026/27 row is provisional: SCP 2 was abolished from 1 Apr 2026 and the 2026/27 NJC award is unsettled; 2025/26 figures are rolled forward with an on-page warning until the award lands (see docs/CARE-RATES-NJC-2026-FINDINGS.md).

Manually curated: updated by hand when the issuing body announces a change.

Update trigger: Budget / annual thresholds SI — add the new tax year to all three calculators (a shared tax engine is on the roadmap to collapse the copies).

2026/27 bands frozen at PA £12,570 / basic £50,270 / additional £125,140 under the fiscal-drag policy.

Manually curated: updated by hand when the issuing body announces a change.

Update trigger: Annual Presidential addendum (effective 6 April) — add the new year's bands.

Manually curated: updated by hand when the issuing body announces a change.

Update trigger: Annual Increase of Limits Order (effective 6 April) — add the new year's cap.

Current cap £719/week (2025–26).

Manually curated: updated by hand when the issuing body announces a change.

Update trigger: Annual GHR uplift (typically January) — add the new year's bands. Pre-2021 rates deliberately out of scope (decision 21 May 2026).

Fixed publication: changes only when the source publishes a new edition.

Update trigger: A new Ogden edition or a change in the personal injury discount rate — re-extract the affected tables.

Date is registry-carried: the JSON's top-level keys are table numbers iterated by the calculators, so metadata fields can't be added to the file. Shared by both multiplier calculators since 30 May 2026 (verified byte-identical to the prior inline copies; 64,285-lookup regression).

Fixed publication: changes only when the source publishes a new edition.

Update trigger: A new Ogden edition — re-extract (936 entries).

Date registry-carried for the same reason as the multipliers file.

Fixed publication: changes only when the source publishes a new edition.

Update trigger: A new JCG edition — re-extract the bracket data.

Fixed publication: changes only when the source publishes a new edition.

Update trigger: A new ISO 7029 revision — re-encode the baseline tables.

The 2017 standard was endorsed in Abbott v MOD (2026); a known sign-flip typo in the published 3kHz/80yo row was corrected at encoding (see docs/NIHL-METHODS-SPEC.md).

Fixed publication: changes only when the source publishes a new edition.

Update trigger: Historical documents — effectively fixed. Extend only if a further published catalogue is adopted.

Fixed publication: changes only when the source publishes a new edition.

Update trigger: HSE guidance revision — update the tool entries.

Fixed publication: changes only when the source publishes a new edition.

Update trigger: Highway Code revision — update the constants.

Statutory: changes only when legislation, an SI or a rule amendment takes effect.

Update trigger: Lord Chancellor's periodic review — update the default rate in the discount-rate pickers (the pickers already span −2% to +3%, so a new rate is selectable immediately).

Current default −0.25% (E&W).

Statutory: changes only when legislation, an SI or a rule amendment takes effect.

Update trigger: CPR amendment (rule committee updates, typically April/October) — update the affected regime's tables.

Statutory: changes only when legislation, an SI or a rule amendment takes effect.

Update trigger: CPR Part 36 amendment — update the consequence logic.

Statutory: changes only when legislation, an SI or a rule amendment takes effect.

Update trigger: Statutory amendment to limitation or EC rules — update the date logic.

Forward s.207B(4) logic verified by David in the 3 Jun 2026 sweep.

Statutory: changes only when legislation, an SI or a rule amendment takes effect.

Update trigger: A new Pensions Act changing the SPA timetable — update the rules.