Congress has extended the first time home buyer credit to homes purchased before May 1, 2010. It also allows home buyers who have owned the same home for 5 consecutive years during the previous 8 years to get up to $6,500 in tax credits if they purchase the new home after November 6, 2009 and apparently before May 1, 2010. Note, the law does not require you to sell your old personal residence. If you do sell your old residence, you still qualify for the tax free gain of up to $250,000 for individuals and $500,000 for married filing joint.
The purchased home cannot exceed $800,000 for either first time home buyers or those who have owned a home the requisite 5 years. The credit phases out if you make too much money, $145,000 for individuals or $245,000 for married tax payers.
Please check with us to make sure you are eligible for the credit as individual tax situations vary.

