If an issuer enters into a transaction for a principal purpose of obtaining a material financial advantage based on the difference between tax-exempt and taxable interest rates in a manner that is inconsistent with the purposes of section 148, the Commissioner may exercise the Commissioner‘s discretion to depart from the rules of section 1.148-1 through section 1.148-11 as necessary to clearly reflect the economic substance of the transaction. For this purpose, the Commissioner may recompute yield on an issue or on investments, reallocate payments and receipts on investments, recompute the rebate amount on an issue, treat a hedge as either a qualified hedge or not a qualified hedge, or otherwise adjust any item whatsoever bearing upon the investments and expenditures of gross proceeds of an issue. For example, if the amount paid for a hedge is specifically based on the amount of arbitrage earned or expected to be earned on the hedged bonds, a principal purpose of entering into the contract is to obtain a material financial advantage based on the difference between tax- exempt and taxable interest rates in a manner that is inconsistent with the purposes of section 148.