Renee, since you bought in December IF you were first time buyers (hadn't owned in 3 years) and your income didn't disqualify you, you would be eligble for 10% of your purchase price up to $7500 as a tax credit that is repayable over 15 years. Check with your tax preparer to be absolutely sure!
You should qualify for the $7,500 tax credit that is repayable over 15 years if you were first time buyers. If you weren't first timers, then you don't. The date of your purchase is what qualifies you, not the date of your first payment
There are more posts on my blog below about the first time buyer credit.