ECB is publishing reference rates: http://www.ecb.europa.eu/stats/exchange/eurofxref/html/index.en.html http://www.ecb.europa.eu/stats/exchange/eurofxref/html/i

ECB is publishing reference rates: http://www.ecb.europa.eu/stats/exchange/eurofxref/html/index.en.html http://www.ecb.europa.eu/stats/exchange/eurofxref/html/index... I don't know if they quality as "official", but probably good enough for taxation purposes.