Financial year question

I am looking to move back to the UK some time in 2009.  My primary question is related to who I owe taxes to in the initial year or so of my moving back.

The US tax year runs from the beginning of January to the end of December.  To be considered as a non-resident you have to have been out of the US for 300 days in any tax year.  The UK tax year runs from April 15th to April 14th of the following year.  Let's say that I move to the UK on March 1st.  As far as the US is concerned I am a resident for that first year, but then I am also in the UK for the whole of their tax year that starts the subsequent April 15th. 

Who do I owe what?  Is this taken into account in the US-UK tax treaty?

A secondary question is spurred by the fact that all of my income is from US-based investments, I will be living off that income while in the UK.  Since this is not earned income in the UK will I even have a UK tax liability?

Hope someone can give me some help on this and thanks in advance.

You do not state what visa you have as this is crucial in acsertaining your US residence status.

Assuming you do not have a green card, your last day of residence for US purposes is normally your last day of presence in the US in the calendar year and you would file a dual status US tax return for that yesr.

You will be UK resident from whenever you return.  Your investment income would be entirely taxable by the UK from when you arrive here, using UK tax laws and rules to decide how it would be taxed.

And as a minor pedantic

• point, the UK tax year is actually April 6th - April 5th.
• Though with taxes, pedantic tings matter!