Employee Moving Exp Info or Relocation tax report

[AZ-Tax]

I am looking at my clients Relocation tax report "exp reimbursements":

Excludable (matches amt in box 12c code P of W-2)
Non deductible (what exactly is this?)
Business Excludable (what exactly is this?)
Taxable not grossed-up (the amt is $0 but what exactly is this?)

[snowshine]

"non deductible" is stuff like temporary housing, meals, and/or buying out a mortgage at the old work location.
"business excludable" is expenses the corp was able to take but *not* report in box 1 of the W-2
"taxable gross-up" is the amount included in box 1 of the W-2 and box 2 for the gross up taxes.
hope this helps