On April 29, the House Ways and Means Committee will hold a mark up on six of the tax extenders, including the research and experimentation tax credit and expensing under section 179.  Earlier this month, the Committee held a hearing on the research and development credit, small business expensing, active financing exception, depreciation for certain race horses, CFC look-through, and two S-corp provisions. The provision on depreciation for certain race horses will not be included in this mark up.  Chairman Dave Camp (R-MI) has indicated that the Committee intends to hold several mark ups on expired or expiring tax provisions, but no date has been scheduled for additional hearings or mark ups.