Yes, to get permission for the extension, you will need to file a 7004 for your LLC and your partner's individual return. You may either fill out the form 7004 in accordance with the instructions given here, and then print and mail the form(s) to the address provided by the instructions. To be very clear, two form 7004's need to be generated. One from your LLC tax return and one from your foreign partner's tax return.
Since your partner is not a US citizen or resident alien, their return will be a 1040 NR return. Turbo Tax does not prepare non-resident returns but our affiliate at sprinttax.com does. You will need to contact them about the correct procedure for filing a form 7004 on a 1040NR return.
Once you receive an ITIN for your foreign partner, his return can be filed electronically online as well as your LLC/partnership return.
Be sure you mail the extension form's 7004 before the due date of your return, which is April 18.
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