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The Chancellor announced plans to reduce the basic rate of income tax from
22% to 20% with effect from 6 April 2008. In addition, the starting rate of
10% will be abolished for earnings and pensions but will be retained for
savings and gains. A phased alignment of the upper and lower earnings
thresholds for national insurance with the basic rate and higher rate tax
bands is also proposed.
The rate of UK mainstream corporation tax will fall in April 2008 from 30%
to 28% coupled with the changes in capital allowance rates. The main rate of
corporation tax for companies with profits from oil extraction and oil
rights (ring fence profits) will be 30% from 1 April 2008.
The small companies' rate will increase from 19% to 20% from 1 April 2007
and the fraction used in smoothing the difference between this and the main
corporate rate (marginal small companies' relief) will be 1/40. The upper
and lower profit limits remain the same. The small companies’ rate for ring
fence profits will remain at 19%. There will be further increases in the
small companies’ rate of corporation tax to 21% on 1 April 2008 and 22% on 1
April 2009.
Our view
Under UK GAAP and International Accounting Standards, a company’s
deferred tax provision should be calculated by applying the applicable
tax rate enacted or substantively enacted by the balance sheet date. The
above announcements will impact on deferred tax calculations for company
accounts.
Changes to the headline corporation tax rate are designed to enhance the
UK’s international competitiveness. The following table illustrates
where the new 28% rate will put the UK in relation to some of its main
competitors.

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