Optimize Health Savings Account Contributions: Did you become eligible to make contributions to a Health Savings Account this year? If so, then you can make deductible contributions into that account up to its maximum amount, no matter when you became eligible. For 2018, the maximum deduction for self-only coverage is $3,450; for family coverage, it is $6,900. Due date to contribute HSA April 15th of the Next Year. (For TY – 2018 the due date is April 15, 2019).