Furthermore it reduces liabilities on the balance sheet. Companies must accrue the cost of leave owed, so if I owe you 12 weeks leave and you get paid $2K a week then I have an accrued debt of $24K.
By having you take that leave I also reduce the debt.
Bear in mind that debt also grows in line with wages/salaries. If your salary goes up the accrued leave value goes up by the same amount.