@BillM223 thanks again
1. The plan runs from July to July, not from January. Due to payroll issues I did not contribute for a few months in 2020 (although I elected to contribute). By the time they fixed it 2021 already started (of course they had to mess this up too, which is why my total contribution for the plan year of 7/2020-6/2021 is $5000 - $215).
Regarding the $2640 vs. $1640, I meant the difference from $6000, which was the maximum of allowed expenses for two children in 2020 (Form 2241 Line 3 / Line 29). I claimed 20% of the $2640.
2. How could they put $6425 in Box 10? Well, I don't know if the plan allows for it, but that is the exact amount I contributed in tax year 2021.
Let's ask this differently, if the plan only allows to contribute $5000 but they let me contribute more than than that (and less than $10,500), whose problem is it?
