ARTICLE 26
EXCHANGE OF INFORMATION

1.         The  competent  authorities  of the Contracting States shall exchange such information as is necessary for the carrying out of this Convention or for the prevention of fraud or for the administration  of  the  domestic laws of the Contracting States concerning  taxes  covered  by  this  Convention  insofar as the taxation  thereunder  is in accordance with this Convention. Any information so exchanged shall be treated as secret and shall not  be disclosed to any persons other than persons (including a court or  administrative  body)  concerned  with  the  assessment  or collection of, or prosecution in respect of, or the determination of appeals in relation to, the taxes which are the subject of the Convention.

2          In no case shall the provisions of paragraph (1) of this Article be construed so as to impose on the competent authority of either Contracting State the obligation:

            (a         to carry out administrative measures at variance with the

                         laws or administrative practice prevailing in either

                         Contracting State;

            (b)        to supply particulars which are not obtainable under the

                         laws   or   in   the  normal  course  of  the administration of

                         that or the other Contracting State;

            (c)        to  supply  information  which  would disclose any business,

                         trade, industrial, commercial or professional secret or trade

                         process, or information, the  disclosure of which would be

                         contrary to public policy.

ARTICLE 27
ENTRY INTO FORCE

1          This convention shall be ratified and the instruments of  ratification shall be exchanged at London as soon as possible.

2          This Convention shall enter into force immediately after the expiration of thirty days following the date on which the instruments of ratification are exchanged and shall thereupon have effect:

            (a)        in the United Kingdom :

                         (i)         in respect of income tax and capital gains tax,  for any

                                      year of assessment beginning on or after 6th  April 

                                      of  the calendar year in which this Convention enters

                                      into force;

                        (ii)        in respect of corporation tax, for any financial year 

                                      beginning  on  or  after 1st April of the calendar year in

                                      which this Convention enters into force;

                         (iii)       in  respect  of  petroleum revenue tax, for any

                                      chargeable  period  beginning  on  or after 1st

                                      January  of  the  calendar  year  in  which this

                                      Covention enters into force; and

                         (iv)       in  respect  of  development  land tax, for any realized

                                      development value accruing on or after 1st April  of 

                                     the  calendar  year in  which  this Convention enters

                                     into force;

            (b)        in Thailand:

                         in  respect  of  Thai  tax  for  taxable  years and accounting

                         periods  beginning  on  or after 1st January of the calendar

                         year in which this Convention enters into force.

ARTICLE 28
TERMINATION

            This Convention shall remain in force until terminated by one  of  the  Contracting  States. Either Contracting State may terminate  the  Convention,  through  the diplomatic channel, by giving notice of termination at least six months before the end of any  calendar  year  beginning  on or after the expiration of a period  of  five years from the date of its entry into force. In such event, the Convention shall cease to have effect:

            (a)        in the United Kingdom:

                         (i)         in respect of income tax and capital gains tax,  for any

                                      year of assessment beginning on or after 6th April in

                                      the calendar year next following that in which the

                                      notice is given;

                         (ii)        in respect of corporation tax, for any financial year 

                                      beginning  on or after 1st April in the calendar year

                                      next following that in which the notice is given;

                         (iii)       in  respect of petroleum revenue tax, for any

                                      chargeable period  beginning on or after 1st January

                                      in the year next following that in which the notice is  

                                      given; and 

                         (iv)       in  respect  of development land tax, for any realized

                                      development value accruing on or after 1st April in the

                                      year next following that in which the notice is given;

            (b)        in Thailand:

                         in  respect  of  Thai  tax,  for  taxable years and accounting 

                         periods  beginning after the end of the calendar year in which

                         the notice is given.

            IN WITNESS WHEREOF the undersigned, duly authorized thereto  by  their  respective  Governments,  have  signed this Convention.

            DONE  in duplicate at Bangkok this eighteenth day of February  in  the  year  nineteen  hundred and eighty-one in the Christian Era corresponding to the two thousand five hundred and twenty-fourth  year  in the Buddhist Era in the English and Thai languages, both texts being equally authoritative.

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