72t on the Net (http://72t.net)
Maximum Interest Rates for 72(t) & 72(q) SEPP Plans where the initial distribution occurs during the following time periods: 03/01/2010-03/31/2010: 3.39% | 04/01/2010-04/30/2010: 3.39% | 05/01/2010-05/31/2010: 3.23%
Owner's Age 
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The maximum interest rate that may be used is any interest rate that is not more than 120 percent of the federal mid-term rate for either of the 2 months preceding the month of the 2st distribution.