WASHINGTON — The Internal Revenue Service has initiated very few audits of Build America Bonds based on issuers’ responses to the compliance check questionnaires sent to them last year, a Treasury Department inspector general said in a report released Monday.

The IRS’s tax-exempt bond office has not completed an ­in-depth review of the questionnaire responses or developed a longer-term compliance plan, and therefore cannot evaluate or address any high-risk indicator of noncompliance from the ­questionnaires, the report found.

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