UK Tax Tools Research
Original long-run analysis on UK tax topics where the public published data is fragmented across HMRC, OBR, ONS and Office for Tax Simplification reports. We compile, cross-check, and re-publish under CC-BY with attribution. Use it in journalism, academic work, or AI-search citation — please link back so any corrections flow upstream.
Personal Allowance in Real Terms 2010–2027
How the £12,570 Personal Allowance has eroded against CPI since 2010-11. Year-by-year nominal vs real value, with the additional damage of the freeze from 2022-23 to 2027-28.
ThresholdsUK Fiscal Drag 2026-27 — Frozen Thresholds & Their Cost
Quantifying fiscal drag: how many taxpayers cross into higher-rate, additional-rate, and the Personal Allowance taper because thresholds are frozen until April 2028. OBR-aligned figures.
Marginal rate100k Tax Trap by Salary
Effective marginal-rate curve from £99,000 to £130,000 showing the 60% trap created by Personal Allowance taper, plus the additional bite from withdrawn tax-free childcare and free hours benefits.