If you owe money and want to pay by check, you can choose either e-filing or mailing. If you e-file, you do not need to include any W-2's, etc.
When you print your return, there will be an instruction sheet and a payment voucher to mail with your check (Form 1040-V).
You have the option to pay your balance due to the IRS
with a check or money order or you can pay
directly through the IRS Website here: https://www.irs.gov/payments.
