The director of the nonpartisan Congressional Budget Office said on Thursday that permanently extending tax cuts put in place under President George W. Bush would provide a "considerable" economic boost over the next several years but would result in substantial increases in the federal deficit, placing the country in a precarious fiscal situation by 2020.

In offering this assessment, Douglas Elmendorf underscored the difficult choice facing lawmakers as they debate whether to extend any or all of the tax breaks, which are scheduled to expire at the end of the year.

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