Reimbursements(p194)

How you treat reimbursements depends on the arrangement you have with your employer.

There are two basic types of reimbursement arrangements—accountable plans and nonaccountable plans. You can tell the type of plan you are reimbursed under by the way the reimbursement is reported on your Form W-2.

For information about how to treat reimbursements under both accountable and nonaccountable plans, see Reimbursements in chapter 26.