My wife is on F1 studying in US, she filled her tax return few days back, now I want to file my tax return as a joint married couple. My question is: how can I fix the problem as my wife has already filled a tax return as individual, now I want to include her taxes and file a joint return as married couple, while filing my return.

Quick reply is highly appreciated. Thanks!!

What visa do you have?
Are you resident or nonresident?

I am on H1-B visa

You need to amend your return. Attach a completed Form 1040 to the Form 1040X, and have you BOTH sign the Form 1040X and the Form 1040.