What to do if you have not filed your tax return? 如果过了纳税季你还没有申报……

You may not have filed your federal income tax return for this year or previous years. Regardless of your reason for not filing, file your tax return as soon as possible. If you need help, the IRS is ready to assist you.

If you are not sure you are required to file a return, refer to Publication 17, Your Federal Income Tax. If you cannot pay all of the tax due on your return, the IRS may be able to assist you with arranging payments. For additional information on tax payment options, refer to Topic 202.

If your return was not filed by the due date (including extensions of time to file), you may be subject to the failure to file penalty, unless you have reasonable cause for your failure to file timely. If you did not pay your tax in full by the due date of the return (excluding extensions of time to file), you may also be subject to the failure to pay penalty, unless you have reasonable cause for your failure to pay timely, or the IRS has approved your application for extension of time for payment of the tax due to undue hardship (refer to Form 1127, Application for Extension of Time for Payment of Tax Due to Undue Hardship. Additionally, interest is charged on taxes not paid by the due date, even if you have an extension of time to file. Interest is also charged on penalties.
There is no penalty for failure to file if you are due a refund. But, if you wait to file a return or otherwise claim a refund, you risk losing a refund altogether. An original return claiming a refund would have to be filed within 3 years of its due date for a refund to be allowed in most instances.
After the expiration of the three-year window, the refund statute prevents the issuance of a refund check and the application of any credits, including overpayments of estimated or withholding taxes, to other tax years that are underpaid. On the other hand, the statute of limitations for the IRS to assess and collect any outstanding balances does not start until a return has been filed. In other words, there is no statute of limitations for assessing and collecting the tax if no return has been filed.
For answers to your tax questions, information about payment arrangements, or any other tax-related inquiries visit the IRS website at www.irs.gov or call the IRS Tax Help Line at 800-829-1040.

What to do if you have not received your W-2 and 1099-R? 如果你还没有收到W-2或者1099-R……

If you do not receive your Form W-2 or Form 1099-R by January 31st, or your information is incorrect, contact your employer/payer.

If you do not receive the missing or corrected form by February 14th from your employer/payer, you may call the IRS at 800–829–1040 for assistance. You must provide your name, address (including zip code), phone number, Social Security Number, dates of employment, your employer/payer’s name, address (including zip code), and phone number. The IRS will contact the employer/payer for you and request the missing form. IRS will also send you a Form 4852 (PDF), Substitute for Form W-2 or Form 1099-R, along with a letter containing instructions.

If you do not receive the missing form in sufficient time to file your tax return timely, you may use the Form 4852 to complete your return. If you receive the missing or corrected Form W-2 or Form 1099-R after you file your return and a correction is needed, use Form 1040X (PDF), Amended U.S. Individual Income Tax Return. For additional information on filing an amended return, refer to Topic 308.

How to get a copy of your prior year’s W-2 form? 如何获取上一年度的W-2表格副本?

The IRS does not retain actual copies of Form W-2 (PDF) except as an attachment to your tax return, for prior years. However, the IRS maintains (and will provide free of charge) Form W-2 information for any purpose for the past ten processing years. Use Form 4506-T (PDF), Request for Transcript of Tax Return, to request Form W-2 information. The only way to get a copy of your Form W-2 from IRS is to order a copy of the entire return on Form 4506 (PDF), Request for Copy of Tax Return, and pay a fee of $57.00 per tax year.

The Social Security Administration (SSA) will provide the Number Holder (NH) or legal representative(s) at no charge with a microprint copy of the Form W-2 requested for purposes of resolving an SSA program related matter; e.g., resolving an earnings discrepancy in connection with the processing of a Title II and/or Title XVI claim or an SSA or NH initiated earnings investigation.

Call 800-829-3676, or visit the IRS website at www.irs.gov to obtain Form 4506 (PDF), Request for Copy of Tax Return, or Form 4506-T (PDF), Request for Transcript of Tax Return.

Call 800-772-1213, or visit the SSA web site at www.socialsecurity.gov for instructions on how to obtain wage information from the SSA.

How to read the letter from IRS? 如何阅读IRS来信?

1. Don’t panic. Many of these letters can be dealt with simply and painlessly.

2. There are number of reasons the IRS sends notices to taxpayers. The notice may request payment of taxes, notify you of a change to your account or request additional information. The notice you receive normally covers a very specific issue about your account or tax return.

3. Each letter and notice offers specific instructions on what you need to do to satisfy the inquiry.

4. If you receive a correction notice, you should review the correspondence and compare it with the information on your return.

5. If you agree with the correction to your account, usually no reply is necessary unless a payment is due.

6. If you do not agree with the correction the IRS made, it is important that you respond as requested. Write to explain why you disagree. Include any documents and information you wish the IRS to consider, along with the bottom tear-off portion of the notice. Mail the information to the IRS address shown in the lower left part of the notice. Allow at least 30 days for a response.

7. Most correspondence can be handled without calling or visiting an IRS office. However, if you have questions, call the telephone number in the upper right corner of the notice. Have a copy of your tax return and the correspondence available when you call.

8. It’s important that you keep copies of any correspondence with your records.
For more information about IRS notices and bills, see Publication 594, The IRS Collection Process. Information about penalties and interest charges is available in Publication 17, Your Federal Income Tax for Individuals. Both publications are available at www.IRS.gov or by calling 800-TAX-FORM (800-829-3676).

Read more about IRS letter here.
http://www.irs.gov/Individuals/Understanding-Your-IRS-Notice-or-Letter