Based on an article by Mark P. Cussen Although the tax code permits a wide range of deductions for taxpayers in various situations, thousands of filers routinely claim deductions for various types of expenses that are in fact non-deductible. Here is a list of some of the more common non-deductible expenses that show up on tax returns each year. 1) Spousal and Child Support Many taxpayers try to deduct these two forms of familial support on their returns. However, alimony is the only type of income paid by one ex-spouse to another that can be deducted. 2) Unreimbursed Work Expenses Although self-employed taxpayers can deduct every dollar of work-related expenses, W-2 employees are limited on the amount of unreimbursed work expenses they can deduct - and only those who are able to itemize their deductions can take advantage. 3) Above-the-Line Deduction for Roth IRA Contributions Unlike traditional IRA contributions, there is no deduction for Roth IRA contributions beca