adjustment factor, the effects of the credit spread were negligible, yields of tax-exempt
bonds were consistently lower than those of U.S. Treasury obligations, and the
adjustment factor produced adjusted AFRs and adjusted Federal long-term rates that
were lower than the corresponding AFRs by percentages that were significant but
smaller than the highest corporate tax rates.
In the last several years, however, the credit spread between U.S. Treasury
obligations and most other obligations, including tax-exempt bonds, has grown
appreciably. Consequently, since the beginning of 2008, market yields of prime,
general obligation tax-exempt bonds have often exceeded those of comparable U.S.
Treasury obligations, and the adjusted AFRs and adjusted Federal long-term rate have
often exceeded the corresponding AFRs. Those results show that the adjustment factor
no longer serves the purposes of sections 1288(b)(1) and 382(f)(2), which contemplate
adjustments to reflect tax exemption but not credit quality. The rates are also
inconsistent with the express intention of Congress that the adjusted Federal long-term
rate and long-term tax-exempt rate be lower than the Federal long-term rate.
D. Possible Modification of Adjustments
The IRS and Treasury Department are considering how the method for
determining adjusted AFRs and the adjusted Federal long-term rate should be modified
so that the method will be: (i) consistent with the purposes of sections 382(f) and 1288,
even as market conditions and tax rates change; and (ii) based on readily available
data. To satisfy these objectives, the adjustment factor may be modified to use different
types of obligations in the numerator, denominator, or both, or a new methodology may
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