Form 2106 is for reporting employee business expenses.
Most employees are no longer able to report business expenses, however there are a few exceptions.
According to the IRS:
"Use Form 2106 if you were an Armed Forces reservist, a qualified performing artist, a fee-basis state or local government official, or an employee with impairment-related work expenses. Employees who do not fit into one of the listed categories may not use the Form 2106 due to the suspension of miscellaneous itemized deductions subject to the 2% floor under section 67(a). Section 67(g) suspends miscellaneous itemized deductions for tax years beginning after 2017 and before 2026. See the flowchart in these instructions to find out if you must file this form.
Excess reimbursements. If you are not a member of the Armed Forces reserves, a qualified performing artist, a fee-basis state or local government official, or an employee with impairment-related work expenses, and receive reimbursements in excess of your expenses from your employer’s nonaccountable plan, the excess reimbursements should be included as wages on your Form W-2 and your income tax return."
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