WASHINGTON — A taxpayer with a marginal income tax rate of 7.5% would have been indifferent to purchasing high-rated tax-exempt or taxable corporate bonds last year because there was only a .35% spread between these bonds, a joint Congressional committee concluded in a report issued Monday.

The Aaa-rated corporate bond rate averaged 4.64% while the rate for high-grade munis averaged 4.29%, according to the report. Those with higher income rates would have benefited more from buying tax-exempt bonds and those with lower rates should have bought corporate bonds, the 52-page report by the Joint Committee on Taxation suggests.

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