What is the 30x annual expenses rule for retirement planning?

The 30X annual expenses rule suggests that an individual should aim to accumulate a corpus worth 30 times their annual expenses before retiring, Moneycontrol reported. The corpus is considered a guideline for sustaining one's lifestyle without outliving savings. For instance, if annual expenses amount to ₹10 lakh, an individual should aim for a retirement corpus of ₹3 crore before retirement.