Dear friend,
The general understanding is that for LWP (Leave Without Pay) purposes, the salary (gross) would mean the salary that the employee would have earned had he not taken leave. This amount will not include incentives, overtime pay, etc., which the employee would have earned through working. In short, it refers to the Basic Pay, Dearness Allowance (DA), House Rent Allowance (HRA), and other allowances paid on a monthly basis for the days the employee would have worked.
Thank you.