The biggest EuroMillions jackpot of all time is the maximum cap of €200 million. This has been won twice, first in 2012, by Adrian and Gillian Bayford from the UK, and again, in 2014, by an anonymous player from Castelo Branco, Portugal. Since the Portuguese taxman takes a 20% share of lottery winnings, however, the Britons remain the biggest winners so far in Euro value.