The main requirements of US and Germany Intergovernmental Agreement came into effect on 31 May of 2013.
German banks were required to extract account balances at 30 June 2014 and undertake checks depending on the value of the account. Higher value accounts (balances over $1m) were reviewed by 30 June 2015 and lower value accounts ($50k - $1m for individuals and $250k - $1m for entities) will need to be reviewed by 30 June 2016.