Match Referee Andy Pycroft deemed that the Black Caps were two overs
short of their target when time allowances were taken into
The charge was laid by on-field umpires Paul Reiffel and Bruce
Oxenford and the he International Cricket Council (ICC) gave the fines.
Williamson could face a ban if the Kiwis were to face such an offence again.
The ICC said in a statement: "If there is a second minor over-rate
offence committed by New Zealand during the event with Williamson as
captain, he will be suspended for one match."
Hosts England went on to beat the Black Caps by 87 runs to be the first team to qualify for the Champions Trophy semi-finals.