Pretty simple stuff. For most people it’s just A,B,C + 1,2,3
A. Address of New Home
B. Date you bought it
C. IF claiming 2009 purchase on this 2008 form, check here
+
1. Enter $7,500 or $8,000 unless married filing separately
2. Enter modified adjusted gross income
3. If 2 is not more than $75,000 ($150,000 if filing jointly), skip to line 6 and put amount on line 1 on line 6. Ta-dah!
You can get Form 5405 and Instructions here:
and it looks like this: