HSA implications of moving to non-HDHP with HCFSA

I'm turning 26, and my current HDHP coverage will end 10/31/24. I'm going to be switching to an employer copay plan that is not HSA-eligible but may include a HCFSA.

My current impression based on some brief research is that my maximum 2024 HSA contribution is prorated (10/12 * $4150). And also that I am not allowed to contribute to the HCFSA this year at all since I've already made HSA contributions. So, while I can benefit from the HCFSA in general, those benefits will not apply until 2025.

Please let me know whether my understanding is right/wrong, and if there are other important considerations I failed to acknowledge. Thanks.

Edit – one additional question I have is, once it's 2025 and I can use the HCFSA, is it allowed to wait until you incur an eligible expense, THEN contribute the respective amount, reimbursing oneself a short time after while maintaining the deductibility of the contribution?

submitted by /u/realtorvicvinegar
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