Posted: Mon Aug 04, 2008 9:29 am-
You should be able to claim a foreign tax credit in the UK for tax paid in Canada, not sure that helps much in this situation though as you have no UK source income from the sounds of it.
Have a talk to the non-resident dept. in Notts. as they will be more familiar with any tax treaty provisions you may benefit from:
http://www.hmrc.gov.uk/cnr/
I'm not sure on pension income but there may be a tax treaty provision that prevents the withholding if you become resident in the UK (or it may be a lower rate). However in that case you would have to pay UK income tax on pension income. The basic rate is 20% although I'm not sure how pension income is taxed, there may be credits. Depends on your age too.
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Steve.