What happens if you filed a tax return
and later realize that you omitted income or overlooked some deductions? You
can amend your return by filing Form 1040X, Amended
U.S. Individual Income Tax Return. Generally, you must file your amended
return within three years after the date you filed your original return. You
cannot change your filing status from Married Filing Jointly to Married Filing
Separately after the due date of the original return.