Bonuses feel like windfall money and most adults spend them on lifestyle. Saving a specific percentage (50-80%) of each year's bonus compounds dramatically over careers.
How to make it automatic
Standing order to investment account same day bonus arrives. Pre-decide percentage before bonus is announced (so emotion doesn't change the math).
What compounds
£3000/year bonus saving at 6% real return for 30 years grows to £240,000. Most adults who save bonuses consistently retire substantially wealthier than those who don't.