NH is initially listed because it does not tax all interest but beyond not taxing specific sources of income NH only taxes interest and dividends that exceed 24...
Yes, since you are both considered resident for tax purposes you may file as married filing jointly. You will need social security numbers or/Individual Taxpaye...
You will need to count your days of US presence that were not exempt (F-status) and determine if you meet the substantial presence test. Here is a link to help ...
Assuming you are a nonresident alien and the taxes were paid to the US government that is who you apply for a refund with. You would need to file a 1040-NR (Non...