In the Citadels one of the benefits of your characters is receiving extra gold from buildings of the same colour. For example, each green building gives one extra gold to the merchant.
I am wondering; does this bonus start immediately at the beginning of your turn, or can one trigger the bonus at will? In the last example it could be beneficial to build a new building before triggering the bonus so one gets an extra gold piece.
Also, do you have to trigger the whole ability at once or can you split it up? This is especially important for the merchant who already gets 1 gold by default as special ability.