g. 1041-N, 1120-POL, 1120-L, 1120-ND, 1120-SF 2. Advantages of E-filing Form 7004 3. Switch to E-filing with ExpressExtension! Recommended Form 7004 - IRS Mailing Address The mailing address of your Form 7004 is based on the following factors: The type of tax return for which ...