While filing taxes is ideally a one-and-done affair, about three million people each year find they need to update a previously filed return. In this case, you'll need to file an amended tax ...

Most married couples will come out ahead by filing jointly, but filing separately may be the better choice for some.

Get step-by-step instructions for how to amend a tax return using Form 1040-X, including deadlines and tips for tracking the status with the IRS.