Calendar Year or Fiscal Year for H1b Visa Holders?
	
	
		Hi,
I would be going to the US on an H1B, accompanied with my wife and two kids (all on H4). Tax experts could you please answer the following doubts of mine:
1. For individuals on H1B, the only selection of tax year is a calendar tax year, right?
2. If I reach US somewhere on Oct 1 2007, I will be able to make the First Year Choice for my 2007 tax year i.e. income during Oct 1, 2007 to Dec 31, 2007 (assuming that I stay for more than 183 days in 2008) and will be able to file as a resident alien with "married filing jointly" status?
3. If I leave US by Sep 30, 2008, what will my status be considered for 2008 tax year i.e.  income during Jan 1, 2008 to Sep 30, 2008? Will it still be considered as a resident alien with "married filing jointly" status? 
If not, then what will be my status and what all type of exemptions (dependents etc) + standard deductions will I be able to claim?
4. Assuming a salary of 60K USD, a resident alien status with married filing jointly status and exemptions for two dependents, other than my wife, from some tax calculator, my tax came to be just 7.5%, is this correct?
Thanks and regards,
Mayank