What has changed

Added a source-linked checklist for a missing submit button or update period. The questions directory now finds this help when searching for submit button; the checklist does not diagnose a fault in any particular product. Source

Added source-linked answers on spreadsheets, receipts, PAYE income, digital exclusion and software connection problems, plus a preparation checklist. Community discussions identify the questions; official guidance supports the answers. Source

The checker now rejects malformed amounts and incomplete income types, preserves pennies near thresholds and warns when earlier years are missing. Figures are no longer written into shareable URLs. Source

Added live source-body comparison without overwriting reviewed snapshots. Removed placeholder contact details and blanket accuracy claims; independent tax review remains pending. Source

Every price reread directly on the vendor's page; four were wrong in our first version and are corrected. Each price now shows the vendor's own words. Source

Added the penalty rules in full, the last tax return sent the old way, part-year income in the checker, and answers to eight questions people ask in forums. Source

Software list refreshed from HMRC's finder: 163 recognised products. Prices checked on 15 product pages. Source

GOV.UK updated its guidance on sending quarterly updates. No penalty points for late quarterly updates in the 2026 to 2027 tax year. Source

GOV.UK updated its sign-up guidance for Making Tax Digital for Income Tax. Source

GOV.UK updated how to work out qualifying income, including ceased income sources and joint property. Source

GOV.UK updated how to apply for an exemption, including when to apply if you start in April 2028. Source

HMRC moved software still in development into its software finder tool. Source