Calculation of Price and Yield on Continuously Callable Securities
Calculation of Price and Yield on Continuously Callable Securities. This will respond to your letter of May 30, 1989, relating to the calculation of price and yield in transactions involving municipal securities which can be called by the issuer at any time after the first optional "in-whole" call date. The Board reviewed your letter at its August 1989 meeting and has authorized this response.
Rules G-12(c) and G-15(a) govern inter-dealer and customer confirmations, respectively. For transactions executed on a yield basis, rules G-12(c)(v)(l) and G-15(a)(v)(l)[*] require the dollar price computed from yield and shown on the confirmation to be computed to the lower of call or maturity. The rules also require the call date and price to be shown on the confirmation when securities are priced to a call date.
In computing price to call, only "in-whole" calls, of the type which may be exercised in the event of a refunding, should be used. The "in-whole" call producing the lowest price must be used when computing price to call. If there is a series of "in-whole" call dates with declining premiums, a calculation to the first premium call date generally will produce the lowest price to call. However, in certain circumstances involving premiums which decline steeply over a short time, an "intermediate" call date--a date on which a lower premium or par call becomes operative--may produce the lowest price. Dealers must calculate prices to intermediate call dates when this is the case. Identical rules govern the computation and display of yield to call and yield to maturity, as required on customer confirmations under rule G-15(a).
The issues that you describe are callable at declining premiums, in part or in whole, at any time after the first optional call date. There is no restriction on the issuer in exercising a call after this date except for the requirement to give 30 to 60 days notice of the redemption. Since this "continuous" call provision is an "in-whole" call of the type which may be used for a refunding, it must be considered when calculating price or yield.
The procedure for calculating price to call for these issues is the same as for other securities with declining premium calls. Dealers must take the lowest price possible from the operation of an "in-whole" call feature, compare it to the price calculated to maturity and use the lower of the two figures on the confirmation. For settlement dates prior to the first "in-whole" call, it generally should be sufficient to check the first and intermediate call dates (including the par call), determine which produces the lowest price, and compare that price to the price calculated to maturity. For settlement dates occurring after the first "in-whole" call date, it must be assumed that a notice of call could be published on the day after trade date, which would result in the redemption of the issue 31 days after trade date. The price calculated to this possible redemption date should be compared to prices calculated to subsequent intermediate call dates and the lowest of these prices used as the price to call. The price computed to call then can be compared to the price computed to maturity and the lower of the two included on the confirmation. If a price to call is used, the date and redemption price of the call must be stated. Identical procedures are used for computing yield from price for display on customer confirmations under rule G-15(a).
You also have asked for the Board's interpretation of two official statements which you believe have a continuous call feature and ask whether securities with continuous call features typically are called between the normal coupon dates. The Board's rulemaking authority does not extend to the interpretation of official statements and the Board does not collect information on issuer practices in calling securities. Therefore, the Board cannot assist you with these inquiries. MSRB Interpretation of August 15, 1989.
 The parties to a transaction may agree at the time of trade to price securities to a date other than an "in-whole" call date or maturity. If such an agreement is reached, it must be noted on the confirmation.
 See [Rule G-15 Interpretation] Notice Concerning Pricing to Call, December 10, 1980, MSRB Manual (CCH) paragraph 3571.
 If a notice of call for the entire issue occurs on or prior to the trade date, delivery cannot be made on the transaction and it must be worked out or arbitrated by the parties. See rules G-12(e)(x)(B) and G-15(c)(viii)(B).
[*] [Currently codified at rule G-15(a)(i)(A)(5)(c)]