DIY Prescribed Rate

The Income Tax Act in numerous places requires interest to be paid, either by the taxpayer or the Minister, on certain overdue amounts. The rate applicable is computed by reference to the “prescribed rate”. The Act also provides for calculating certain kinds of benefits by reference to that same rate. The rate fluctuates each calendar quarter. Usually, the CRA publishes the rate on its website well in advance of each quarter. For some reason, however, the CRA has still not published the rate for 2010 Q3. What is a poor tax adviser to do?