You cannot fax or email your annual income tax return. According to the IRS website, the most common option for filing as of January 2014 is electronic filing, or e-filing. Alternatively, you can submit your return through the traditional snail mail route by printing it out and mailing it in.

Communicating with the IRS

In some cases, taxpayers may need to communicate with the IRS for reasons related to their returns. The IRS might send a mail audit request, for instance, seeking copies of documents. In some instances, you might be able to fax or email certain papers to the requesting office. When filing, though, e-filing leads to the fastest turnaround on refunds and is fairly efficient to complete with online tax preparation software.