What to do with the envelope of the tax return If you are mailing to your local IRS office, use the U.S. mail address and stamp the envelope. If you are sending your tax return by fax or e-mail, you should include an IRS TIN or certified copy of a U.S. government-issued U.S. passport with your return, not just the tax return. How I found this guide Several years ago after reading “The Ultimate Tax Glossary”, I realized that there were several other resources that had good information on the Web, but none were complete in terms of covering everything I wanted to know about tax preparation and filing and the instructions. So, I came up with my own guide, which I call “The Ultimate Tax Glossary”. This guide covers not only the major terms in this subject (Form 1040, Form 8937, and Forms 1099 — EIN, U.S. Individual Income Tax Return), but also goes into great detail discussing specific subject matters, e.g., what to do if you don't get an e-mail confirming receipt of Form 1040 or other Form 1040-EZ. If you want to see how detailed the guide is, just read over it now and then look at it again later. This will give you a sense of the size and scope of the book. To see the other sections of my guide, just click on the tabs at the top of each page. You can also get a full, detailed “How to prepare a tax return” guide by clicking on “Prepare a Return to Get a Master File Number” above. Finally, you can get a complete glossary of terms, which may help you to know at a glance what to call any subject related to tax, tax planning, or taxes you are likely to deal with more than a dozen times throughout the year. If that wasn't enough, you can get even more information by looking at this list of tax related Websites. This information is only about Tax-related software, tax preparation software, and various tax related materials (e.g. Form 1040, 1040EZ, 990-EZ). This guide does not cover how to pay your taxes, or the forms required to do so.