American Football Rules IFAF Approved Ruling 3-2-3:VI
VI. Team A scores a touchdown during a down in which time expires. During Team A’s successful try, Team B fouls. RULING: The period is not extended for the kickoff. Team A may accept the penalty and repeat the try, or decline the penalty and accept the score. Penalties for personal fouls and unsportsmanlike conduct are enforced on the subsequent kickoff or the succeeding spot in extra periods. [Cited by 10-2-5-e, 3-2-3-a, 8-3-3-b-1]