PlainISA

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UK ISA Editorial Process

our editorial process specialising in UK personal-finance and tax-advantaged savings

Background

PlainISA is the PlainISA team responsible for compiling 2026/27 HMRC Individual Savings Account rules, allowance schedules, transfer mechanics, and Lifetime ISA bonus eligibility into plain-English calculators and decision aids. Every rule and rate is independently verified against the published HMRC guidance, Spring Budget statement, or relevant Statutory Instrument before publication.

How to use this site

PlainISA publishes reference material, data-driven pages, and explanatory tools. Use the source information, assumptions, limitations, and methodology shown on the individual page to decide whether it fits your situation.

Published information can summarize source data or provide an estimate; it is not professional financial, medical, legal, or engineering advice. For an important decision, compare the relevant page with a primary source or a qualified professional.

How information is presented

Pages that present data or estimates identify the available source, method, and material limitations. Results can differ from real-world outcomes because inputs, rules, rates, rounding, data coverage, and individual circumstances vary.

The methodology page explains the site-level approach and limitations. Check the source information on the page you are using rather than treating site-wide wording as a substitute for the current source.

Feedback

If you find an error, stale figure, or missing context on any page we publish, please use the contact page or write to hello@plainisa.co.uk with the URL and the issue.

Areas of focus

  • UK Individual Savings Accounts (ISAs)
  • Lifetime ISA mechanics and government bonus
  • Junior ISA contribution rules
  • HMRC tax-year transitions
  • compound projection mathematics

Contact and identity