American Football Rules IFAF Approved Ruling 3-2-3:VII

VII. Team A scores a touchdown during a down in which time expires. After the try ends, either team commits a dead-ball foul. RULING: The try may be repeated for an accepted penalty if a live-ball foul occurred during the try; the penalty for the dead-ball foul will then also be enforced on the repeated try. The period is not extended to enforce a penalty for a dead-ball foul. If accepted, this penalty must be enforced on the kickoff to start the next period or at the succeeding spot in extra periods [Cited by 10-2-5-e, 3-2-3-a, 8-3-3-d-2, 8-3-5]