If you have several tax numbers and don't know, which is the VAT-ID, check this European database:

http://ec.europa.eu/taxation_customs/vies/vieshome.do?selectedLanguage=EN

The VAT-Id starts with two letters representing your country (e.g. DE for Germany).

Then some digits are following.

Example: The VAT-Id of the top500 company is DE163709325

More about the VAT-Id or the VIES (VAT Information Exchange System) can be found here:

http://ec.europa.eu/taxation_customs/taxation/vat/traders/vat_number/index_en.htm

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