Mitt Romney wants to cut the income tax rate 20% across the board. He argues that he can broaden the tax base by eliminating tax deductions. Broadening the tax base will pay for cutting the tax rate. He does not specify which deductions he will cut to broaden the tax base. He has good reasons for not being specific. All of the major tax deductions are strongly supported by a variety of interest groups. The top 10 deductions are listed in this article. It would be difficult to eliminate any of them.