Institute of Public Accountants and Tax Consultants
http://www.accountancy.be
Ministry of Finance
http://minfin.fgov.be
National Bank of Belgium
http://www.nbb.be
Belgian Bankers' Association
http://www.abb-bvb.be
Handy utilities:
Validation of EU VAT numbers
http://ec.europa.eu/.../vies/vieshome.do
Currency convertor
http://www.oanda.com/converter/classic