Artikel 20

1. This Convention may be extended, either in its entirety or with any necessary modifications, to either or both of the countries of Surinam or the Netherlands Antilles, if the country concerned imposes taxes substantially similar in character to those to which this Convention applies. Any such extension shall take effect from such date and subject to such modifications and conditions, including conditions as to termination, as may be specified and agreed in notes to be exchanged through diplomatic channels.
2. Unless otherwise agreed the termination of the Convention shall not also terminate the application of the Convention to any country to which it has been extended under this Article.