WASHINGTON - The General Accounting Office says Congress needs to step up scrutiny of federal tax expenditures such as tax-exempt interest on municipal bonds to make sure those federal subsidies are efficient and to eliminate any that are not.

In a report released earlier this month, the GAO said Congress has looked closely for years at spending programs but failed to keep tabs on tax expenditures, even though those expenditures are expected to continue to grow at a steady pace through the rest of the decade.

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