Sales of previously occupied homes took the largest monthly drop in more than 40 years last month, sinking more dramatically than expected after lawmakers gave buyers additional time to use a tax credit.

The report reflects a sharp drop in demand after buyers stopped scrambling to qualify for a tax credit of up to $8,000 for first-time homeowners. It had been due to expire on Nov. 30. But Congress extended the deadline until April 30 and expanded it with a new $6,500 credit for existing homeowners who move.

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