Under the federal plan, if you have not owned a home in the past three years and you buy a new or existing home between Jan. 1, 2009 and Nov. 30, 2009, you could get up a $8,000 federal tax credit. This credit is refundable. In other words, you can get this $8,000 credit back even if you don't earn enough money to owe taxes. The credit phases out between $75,000 and $95,000 in income for singles and $150,000 and $170,000 for couples filing jointly.
Under the state plan, if you buy a newly built home in California on or after March 1, 2009 and before March 1, 2010, you will be eligible for a state tax credit equal to 5% of the purchase price or $10,000, whichever is less. The credit must be spread over three years, and you don't have to be a first-time buyer.
Within one week of the sale, the seller must certify to the California Franchise Tax Board that the home was new and unoccupied. The state has set aside $100 million for this program and will dole it out on a first come, first served basis. There is no income limit on the credit, but it's nonrefundable. You can't benefit from it if you don't pay state taxes.
You'll have to pay back the state credit if you don't live in the home for two years, and repay the federal credit if you move out before three years.