Several actions by Congress and the IRS aimed to reduce improper claims of the earned income tax credit by increasing preparer penalties and due diligence procedures. * Litigation over restricted stock-based compensation focused on the proper date of the stock's market valuation and the effect of company and SEC restrictions on disposition of the stock. * The Tax Court applied the IRS's recent practice of allowing professional gamblers to deduct ordinary and reasonable nonwagering business expenses over their gambling winnings, overturning a 1951 case holding. * The Tax Court also held that limited partners of a limited partnership who perform services for the partnership in their capacity as partners may be liable for self-employment taxes despite a general statutory exemption from self-employment income for limited partners' income. Reprinted by permission of the publisher.