An issue consists of arbitrage bonds if sale proceeds of the issue in excess of 10 percent of the stated principal amount of the issue are used to finance any reserve or replacement fund, without regard to whether those sale proceeds are invested in higher yielding investments. If an issue has more than a de minimis amount of original issue discount or premium, the issue price (net of pre-issuance accrued interest) is used to measure the 10-percent limitation in lieu of stated principal amount. This rule does not limit the use of amounts other than sale proceeds of an issue to fund a reserve or replacement fund.