Most US citizens and long-term residents (green card holders) living in the UK are subject to tax in both the US and the UK. Year-end tax planning is therefore something that has to be considered twice, in the battle to minimise global taxes.
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UK tax is usually higher than the equivalent US rate, but that is not always the case and so it is always worth taking specific advice before taking any action. Notwithstanding that, some things that are sensible for UK taxpayers are less appealing for a US taxpayer.