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For you and your family
Standard mileage and other information

Forms and Instructions

Individual Tax Return
Instructions for Form 1040
Request for Taxpayer Identification Number (TIN) and Certification
Request for Transcript of Tax Return


Employee's Withholding Allowance Certificate
Employer's Quarterly Federal Tax Return
Employers engaged in a trade or business who pay compensation
Installment Agreement Request

Popular For Tax Pros

Amend/Fix Return
Apply for Power of Attorney
Apply for an ITIN
Rules Governing Practice before IRS

Email Encryption Procedures Using the WinZip Utility

In order to protect potentially sensitive agency information, the IRS Office of Safeguards requests agencies to adhere to the following protocols when transmitting electronic documentation:    

  • Compress files in .zip or .zipx formats
  • Encrypt the compressed file using Advanced Encryption Standard (AES),
  • Use a strong 256-bit encryption key string,
  • Ensure a strong password or pass phrase is generated to encrypt the file and 
  • Communicate the password or pass phrase with the Safeguards Office through a SEPARATE email or via a telephone call to your IRS contact person. Do NOT provide the password or pass phrase in the same email containing the encrypted attachment.

Refer to your specific file compression software user guide for instructions on how to compress and encrypt files.  Known products compatible with IRS include, but are not limited, to WinZip and SecureZip.

Please remember, while the attachment is encrypted, the content of the email message will not be encrypted so it is important that any sensitive information be contained in the attachment (encrypted document).

References/Related Topics