Thank you for investigating.
There was no overfunding of either HSA. My 2018 W-2 reports $3,450.00 for code W amount in box 12. The code on my spouse's 2018 W-2 reports $2125.05 for code W amount in box 12. But, Form 5498-SA provided by our HSA provider shows $2464.72 from employer contributions, which is corroborated by the 2018 transaction history of our HSA. Nonetheless, $2125.05 or $2464.72 is well below the individual contribution limit. Or the spouse allocation (assuming 50/50) of a family contribution limit.
