HMRC Compliance

HMRC Self Assessment & Foreign Income (SA100 + SA109)

Step-by-step guide to filing Form SA100 and Supplementary Page SA109 for foreign income, split year treatment, and double tax relief claims.

Key Statutory Thresholds & Rules (2025/2026)

HMRC Compliance & Tax Planning Checklist

  • Verified against GOV.UK Statutory Tax Guidance and HMRC Finance Act updates.
  • Applies to UK tax year: 6 April 2025 – 5 April 2026.
  • Self-Assessment deadlines: 31 October (Paper) / 31 January (Online).