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Hi and welcome to Just Answer!Both taxing authorities are correct. As a UK resident you are fully responsible for UK income tax on all your worldwide income.As you are US citizen - you are required to report all your worldwide income on your US tax return. Because you are a bona fide resident of the UK - you may claim a foreign earned income exclusion. However your pension income is not earned income and may not be excluded.However - if the same income is taxed in both countries - you may claim a credit for foreign tax paid on your US tax return - thus effectively will avoid double taxation.Let me know if you need any clarification of help with reporting.