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 case may be, that Article to any territory to which the Convention has been extended by the United States or the United Kingdom. ohannelIslandsand (5) The provisions of the preceding paragraphs of this Article shall Isle of Man. apply to the Channel Islands and the Isle of Man as if they were colonies of the United Kingdom. ARTICLE XXIII Ratification. (1) The present Convention shall be ratified and the instruments of ratification shall be exchanged at Washington as soon as possible. Effective dates. (2) Upon exchange of ratifications, the present Convention shall have effect (a) as respects United States tax, for the taxable years begin- ning on or after the first day of January 1945; (b) (i) as respects United Kingdom income tax, for the year of assessment beginning on the 6th day of April 1945 and subsequent years; (ii) as respects United Kingdom surtax, for the year of assessment beginning on the 6th day of April 1944 and subsequent years; and (iii) as respects United Kingdom excess profits tax and national defence contribu- tion, for any chargeable accounting period beginning on or after the first day of April 1945 and for the unexpired por- tion of any chargeable accounting period current at that date. ARTICLE XXIV Duration; termina- (1) The present Convention shall continue in effect indefinitely but either of the Contracting Parties may, on or before the 30th day of June in any year after the year 1946, give to the other Con- tracting Party, through diplomatic channels, notice of termination and, in such event, the present Convention shall cease to be effective (a) as respects United States tax, for the taxable years be- ginning on or after the first day of January in the year next following that in which such notice is given; (b) (i) as respects United Kingdom income tax, for any year of assessment beginning on or after the 6th day of April in the year next following that in which such notice is given; (ii) as respects United Kingdom surtax, for any year of as- sessment beginning on or after the 6th day of April in the year in which such notice is given; and(iii) as respects United Kingdom excess profits tax and national defence contribu- tion, for any chargeable accounting period beginning on or after the first day of April in the year next following that in which such notice is given and for the unexpired portion of any chargeable accounting period current at that date. (2) The termination of the present Convention or of any Article thereof shall not have the effect of reviving any treaty or arrangement abrogated by the present Convention or by treaties previously con- cluded between the Contracting Parties. TREATIES [60 STAT.

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