UK Tax & Wrapper Guide

Tax Position Guide (Research Context Only)

This guide provides a UK tax baseline for interpreting research outputs across stocks, ETFs, portfolio tools, workflows, and reports. It is intended for product context only.

Important disclaimer

This is not tax advice. Tax treatment depends on individual circumstances and may change. Any client recommendation should be confirmed by the adviser with a qualified tax specialist.

1) UK wrappers baseline

  • ISA: no UK CGT and no UK dividend tax inside the wrapper, subject to ISA rules and allowances.
  • SIPP/Pension: typically no UK CGT or income tax inside wrapper; tax generally arises on drawdown per pension rules.
  • GIA/Dealing account: normal UK dividend tax and CGT regime applies.

2) US-source dividend withholding (UK perspective)

  • Direct US shares: usually 15% US withholding with valid W-8BEN on file; otherwise 30%.
  • Ireland-domiciled UCITS: typically 15% withholding at fund level on US dividends.
  • Luxembourg-domiciled UCITS: can be less efficient in practice for US dividends (often modeled up to 30% at fund level unless treaty eligibility is secured).

3) Instrument-level assumption policy

Tax assumptions should be interpreted at instrument level, not as a single global number. A practical label istax_efficiency_assumption per instrument.

Example labels: Direct US equity (W-8BEN assumed 15%), IE UCITS (15% fund-level withholding), LU UCITS (up to 30% fund-level withholding unless treaty eligibility is secured).

Assumptions to state when discussing tax context

  • Wrapper selected (ISA / SIPP / GIA)
  • W-8BEN assumption (Yes / No)
  • Instrument domicile assumption
  • Date/version of assumptions
  • Uncertainty note: illustrative treatment, adviser/tax specialist to confirm