Can I make post-tax contributions? And if so, will I get the tax benefit? Admin March 27, 2017 16:21 Updated Yes, and then it can be claimed as an above the line deduction on your annual tax return. Related articles If I enroll in the CDHP and enter an annual contribution for my HSA, is the full amount available to me upfront? Can I contribute the maximum annual amount to my account no matter when I am hired? What happens to my HSA when I die? How do I contribute and is there an annual limit?