The monthly expense must be calculated on a monthly basis.
Example #1: January’s ferry + bus combination = $280. In 2019 the statutory limit is $265. Only $265 can be reimbursed. The unpaid balance of $15 cannot carry over to a future month.
Example #2: January’s transit expenses are $170. July’s transit expenses are $280. July’s reimbursement is $265, the maximum monthly limit in this example. January’s smaller expense total has no bearing on reimbursing more than the maximum monthly limit in July.