Per the Instructions for Form 1120, US Corporation Income Tax Return, page 5:
Electronic Deposit Requirement
Corporations must use electronic funds transfer to make all federal tax deposits (such as deposits of employment, excise, and corporate income tax). Generally, electronic funds transfers are made using the Electronic Federal Tax Payment System (EFTPS). However, if the corporation does not want to use EFTPS, it can arrange for its tax professional, financial institution, payroll service, or other trusted third party to make deposits on its behalf. Also, it may arrange for its financial institution to submit a same-day payment (discussed below) on its behalf. EFTPS is a free service provided by the Department of the Treasury. Services provided by a tax professional, financial institution, payroll service, or other third party may have a fee.
To get more information about EFTPS or to enroll in EFTPS, visit EFTPS