Open data · United Kingdom
Download the calculations behind our research in reusable formats. Each dataset names its official source, states its method, and provides a stable link for attribution.
The first release documents the 2026/27 voluntary National Insurance calculation: HMRC's £18.50 weekly Class 3 rate alongside DWP's £241.30 weekly full New State Pension. The published files preserve the calculation rather than asking readers to trust a summary.
National Insurance · current and historical rates
A live-derived series comparing Class 2 and Class 3 annual voluntary National Insurance costs with the annual State Pension uplift from one qualifying year. It is useful for checking the arithmetic, not for replacing a personal State Pension forecast.
Source: HMRC voluntary National Insurance contribution rates and DWP State Pension rates. Data vintage: .
Pension rates · reusable reference table
Eight source-linked State Pension, voluntary NI and Annual Allowance figures, including explicit arithmetic for the two derived voluntary-NI rows. The compiled CSV is available under CC0 1.0.
Source: DWP and HMRC. Data vintage: .