1040x 2018 mailing address

The mailing address for the IRS Form 1040X (Amended U.S. Individual Income Tax Return) for the 2018 tax year is:

Internal Revenue Service Amended Return Department 1111 Constitution Ave NW Washington, DC 20224-0002

You can also mail your amended return to the IRS at the following address if you are filing from outside the United States:

Internal Revenue Service Amended Return Department 1111 Constitution Ave NW Washington, DC 20224-0002 Attn: International Address

Please note that you should not send cash or personal checks with your amended return. You can pay any taxes owed with a check or money order made payable to the "United States Treasury" or pay online through the Electronic Federal Tax Payment System (EFTPS).

It's also important to note that you should keep a copy of your amended return and supporting documents for your records.