an elective deferral sounds like it's handled through your employer's cafeteria plan and you've requested a certain amount be taken out of your paychecks and put in your HSA. the effect is that box 1 of your w-2 will be reduced by the elective deferrals you make (this is how you get the deduction) and will show up on the w-2 as code W in box 12 (this will include any employer match) which carries to line 9 of the form 8889 (HSA reporting). if that is not the maximum allowable for 2022 you can personally contribute the difference by 4/17/2023 (for 2022) these get entered on line 2 of the 8889 and you get a deduction for them on schedule 1 line 13. be careful not to overcontribute. that can create penalties if not timely corrected.
