The percentage of income that a pension replaces varies depending on factors such as the individual's salary history and the terms of their pension plan. Generally, an individual's pension aims to replace a portion of their pre-retirement income in order to sustain their standard of living during retirement. However, there is no fixed percentage that universally applies to everyone's situation. Some pensions may replace a higher percentage of income (50-70%) for those with lower lifetime earnings, while others might provide a smaller replacement rate (20-40%) for those who had higher salaries throughout their working years.