If the 90 percent test fails the penalty under IRC section 6621(a) (2) 3 percent plus fed short-term rate. Currently the rate is 5 percent a year. 90 percent of assets less qualified assets times the 6621 rate. Here is a 90% test penalty example. Total Assets: $50 million. 90 percent of assets are $45 million. Total qualified assets $40 million. There is a $5 million shortfall. The monthly penalty is $20,833.33, $5,000,000 X (5 percent/12). If there is a penalty, the shortfall will be recalculated each month. If the fund invests in a separate business, then we can replace 90 percent with 63 percent for assets inside the business. We still need the second set of regulations from the treasury department to come up with firm penalty calculations for failing the 50 percent of revenue rule.