TFX will e-file your return whenever possible. In some instances, however, the IRS does not allow taxpayers to e-file their returns, for example:

Determining whether you need to mail your tax return depends on various factors. To remove any uncertainty, once we have completed your return, we will provide you with a Final Instructions document. This document will outline precisely when and where you should mail your tax return, tailored to your specific circumstances.

We hide all sensitive data by default on e-filed returns, but mailed returns must be unmasked for the IRS to process them. Double-check that all sensitive data (like your, spouse's or children's SSNs, or bank account information) are unmasked.

We recommend that you print your entire tax return (single-sided) and enclose all pages from the PDF file we provided (including those marked "For Your Records"). Either a U.S. letter or a European A4 size is acceptable.

Why include pages marked "For Your Records?" These worksheets may help the IRS understand how you calculated some of the figures on your return. There's certainly no harm in adding them in.

Attach all the U.S. tax forms we prepared.

If you were provided any other U.S. tax forms by other institutions (such as Forms 1099-B, 1099-G, W-2, etc.), enclose them with your return.

Returns submitted by mail require the taxpayer's wet signature (you can't electronically sign the PDF on your computer; you must physically sign the printed return with a physical pen). Sign and date page 2 of Form 1040. If you are filing jointly, both spouses must sign the form.

Unless you are responding to an IRS request or filing an amended return requiring that you include foreign documentation as proof to request a refund, do not attach non-U.S. forms to your tax return.

You should keep any foreign tax forms you receive for your records, but please do not send your Australian PAYG Summary or your Swiss Certificat de Salaire to the IRS: they won't know what to do with them.

The IRS considers the postmark date of your return, not the date it is received. If your return is postmarked by the filing deadline, it will not be considered late, regardless of when it arrives. This rule applies to filing deadlines on April 15, June 15, October 15, and December 15.

If your personal federal return cannot be filed electronically, you are required to send your printed return to the IRS with a wet signature. The IRS address for filing personal federal returns:

For more information, refer to the IRS instructions on Where to File Paper Tax Returns With or Without a Payment.

If your state return cannot be filed electronically, you must mail your return to the State Tax Authority with a wet signature. Each state has a specific mailing address. Refer to the following articles to find the appropriate address:

❗ Important notes: 

IRS does not allow e-filing of certain non-personal returns (forms 3520/3520-A for foreign trusts, Form 709 for gifts, and Form 1120-F for certain foreign corporations).

Note: Form 1040 is e-filed or mailed on paper separately to a different address.

U.S. trust and business returns (forms 1041, 1120, 1120-S, 1065) are usually e-filed. However, tax returns for the previous years or returns submitted during the IRS winter maintenance period (November-December) must be mailed.

U.S. business returns are mailed separately from individual tax returns to a different IRS office. The mailing address depends on the U.S. state where the business is incorporated, the number of gross receipts, and whether you enclose payment or not. You can find the mailing address for your type of federal business return here:

State business returns are mailed to the state of business registration. Each state has a distinct mailing address; please refer to the State web portals for tax payments & refunds article to obtain the appropriate address.

Business returns for foreign corporations, foreign partnerships, and foreign disregarded entities (forms 5471, 8865, and 8858) are filed with the individual tax return Form 1040, whether the return is e-filed or mailed.

These phone numbers are for international taxpayers who must send packages and documentation to the different campuses. If the courier service you are using (FedEx, DHL, UPS, etc.) requests a phone number for the destination, please use one of the following: