To fill out box 12 on a W-2 form, input the corresponding code to the type of benefit paid on behalf of the employee, says Tax Slayer Pro. Benefits include non-taxable sick pay, substantial business expenses, non-taxable combat pay and adoption benefits.
Other codes used in Box 12 of a W-2 form relate to uncollected social security and Medicare tax on group-term life insurance. If an employer pays for life insurance for the employee, there are taxes on premiums in excess of $50,000, says Intuit. Income from the exercise of non-statutory stock options is another benefit paid employers list in Box 12.