@jtax1
2025 is far enough that there are no guarantees the Congress won’t change the law. Based on current law this is what happens:
If you and your wife are covered by a family HDHP, then you are each allowed to contribute to an HSA in your own name, even though the insurance policy might be in the name of only one of you. Your eligibility to contribute to an HSA is determined by your type of medical coverage one the first day of each month. If you turn 65 on November 30, your Medicare will start November 1 as long as you sign up for Medicare three months before up to three months after your 65th birthday. The only way to remain fully eligible for all of 2025 would be to not sign up for Medicare until April 2026, and you may be facing penalties at that point for signing up late. I’m not an expert on that, but let’s assume that you take Medicare on November 1.
If you are enrolled in a family HDHP from January to October, you will be able to contribute 10/12 of the annual maximum into your HSA. For 2021, that would be $7200 times 10/12 = $6000 plus $1000 catch-up provision x 10/12 = $833 = $6833 total.
If you and your wife remained enrolled in a family HDHP even though you were also enrolled in Medicare, your wife could contribute the full annual maximum to her account, which for 2021 would be $8200. If she switches to self-only coverage effective November 1, then her annual contribution limit would be $6833 (for the 10 months of family coverage) plus $766 for 2 months of self-only eligibility for a total of $7566.
However, your overall maximum family limit is whatever your wife’s limit is plus $833 which represents your catch-up limit. Your catch-up limit can only be contributed to an HSA in your name and your wife’s catch-up limit of $1000 can only be contributed to an HSA in her name, and the rest of your annual limit can be divided between your accounts any way that you like.
