deleting my previous message

[love_tt]

Deleting

[fanfare]

you are looking at two different events, one for 2016 and one for 2018.

if you cashed one check, you're missing a check and should ask for a replacement.

Looks like you have two tax years to amend.

[love_tt]

Deleting 

[fanfare]

upon filing 1040-x you have one year to pay up no interest or penalty.

how they came up with this rule, I have no idea.