The TN visa is considered a work visa, but you probably will NOT meet the Substantial Presence Test, so you have a choice.
You can file as a MARRIED non-resident alien, filing Form 1040NR. Because you are from Mexico, you CAN claim your wife and children as dependents. This allows you to claim ONLY the U.S. income earned from 1 October to 31 December 2011, with personal exemptions of about $15,000.
OR
You can file jointly with your wife and you both CHOOSE to be treated as resident aliens. This will allow you to claim the $11,800 joint standard deduction plus two $3,800 personal exemptions (for yourself and your wife) plus two personal exemptions for your children.
To apply for an ITIN, you need to complete Form W-7 for your wife and children. You need to make a photocopy of their passports, then get the photocopies notarized. This can be done at your local bank in most states in the U.S.
The downside is that:
• You must wait until 1 June 2012 to meet the Substantial Presence Test before you can file for Tax Year 2010. We will file the extension (Form 4868) for you as part of our service at no additional charge.
• you must declare ALL 2011 world-wide income (wife's home country income, if applicable). There is an offset available by either claiming the Foreign Tax Credit (Form 1116) or to claim the Foreign Earned Income Exclusion (Form 2555).
Even with the downside, this is probably the best way for you to file.
If you need professional help when it comes time to file, email me at
[email protected].