It's not a "credit", it is a deduction.

Is the taxpayer self employed filing a Schedule C?  If so, just enter it as an "other" deduction on Schedule C.

He's an employee, not self-employed.

I just dug through the Code a bit, and unfortunately my first impression is that it would be a misc itemized deduction, which would usually be subject to the 2% haircut, but not currently allowed.

I suppose if you disagree with that and want to be aggressive and take the deduction, you could enter it as a negative amount as an "other income" on Schedule 1.  But as of now, my reading of things would put it in the itemized deductions with a 2% haircut (which is not even allowed right now).

"He's an employee, not self-employed."

Is he a shareholder, then? For a passthrough entity?

Are you asking for this:

https://www.irs.gov/pub/irs-utl/am2010007.pdf

A "regular" employee would not benefit from this.

Have they got the full determination?

Here's the earlier discussion topic:

https://proconnect.intuit.com/community/lacerte-tax-discussions/discussion/balance-sheet-179d-credit...

That's what was my initial thought as well.  Thanks for your input!