Rule G-15(a) generally requires that confirmations of municipal securities transactions with customers state a dollar price and yield for the transaction. Thus, for transactions executed on a dollar price basis, a yield must be calculated; for transactions executed on a yield basis, a dollar price must be calculated. Rule G-33 provides the standard formulae for making these price/yield calculations.

It has come to the Board’s attention that certain municipal securities have been issued in recent years with features that do not fall within any of the standard formulae and assumptions in rule G-33, nor within the calculation formulae available through the available settings on existing bond calculators. For example, an issue may have first and last coupon periods that are longer than the standard coupon period of six months.

With respect to some municipal securities issues with non-standard features, industry members have agreed to certain conventions regarding price/yield calculations. For example, one of the available bond calculator setting might be used for the issue, even though the calculator setting does not provide a formula specifically designed to account for the non–standard feature. In such cases, anomalies may result in the price/yield calculations. The anomalies may appear when the calculations are compared to those using more sophisticated actuarial techniques or when the calculations are compared to those of other securities that are similar, but that do not have the non–standard feature.

The Board reminds dealers that, under rule G-17, dealers have the obligation to explain all material facts about a transaction to a customer buying or selling a municipal security. Dealers should take particular effort to ensure that customers are aware of any non-standard feature of a security. If price/yield calculations are affected by anomalies due to a non-standard feature, this may also constitute a material fact about the transaction that must be disclosed to the customer.