Why would I want to distribute my HSA contribution unequally?
If you contributed more to your HSA than your spouse contributed to their HSA, it might be better to allocate more of the total contribution to yourself than to your spouse.
Example: You contributed $6,000 to your family HSA and your spouse contributed $2,300 to their HSA, which is a single HSA. The total family limit is $8,300, which you've contributed correctly.
If you divide the contribution evenly, as the IRS automatically does, you'd each have a contribution of $4,150.
This means you've gone over your contribution limit, but your spouse is under their limit. Instead, you could give yourself a contribution limit of $6,000 (which is within the family limit) and your spouse a contribution limit of $2,300 (within the single limit).
Make sure the total amounts allocated to you and your spouse add up to the total family contribution limit for the year. In 2025 the family limit is $8,550.
Note: If you or your spouse is 55 or older, the extra $1,000 you can contribute per person can't be split between spouses in this way.