The antonyms for the word "additional compensation" would include terms like "reduction in pay," "salary decrease," or "decrease in benefits." These words suggest a situation where an employee may not receive any extra benefits or financial rewards in their job. In some cases, an organization may even choose to reduce pay or benefits due to economic conditions. Other antonyms for "additional compensation" might include "pay cut," "downsize," or "elimination of bonuses." Companies may choose these measures as a way to cut costs or balance their budgets, but they can have a negative impact on employee morale and motivation.