In a nutshell, you need income protection when you are unable to work. Ill health is difficult to plan for, but you can protect your income from it. Lost income is not a joke and can make a huge difference to your lifestyle.
Think about your regular income.
It is nice to have it. You can shop, eat out and feed the family, or even go on holidays abroad. What happens when you break your ankle playing five-a-side on Thursday and are out of work for months? Who picks up the pieces when you are the main breadwinner?
What happens when your income disappears? You need income protection for when the unexpected happens.