use SSN.
The difference between EFTPS and the IRS’s other electronic payment tool, Direct Pay, is quite simple. Both individuals and business owners may pay federal taxes using EFTPS, whereas Direct Pay is only available to individuals. In addition, there is no limit to the amount of money that can be sent via EFTPS, unlike Direct Pay, which caps at $10 million.
with either method, no forms are submitted. all the necessary info is included when you submit payment
you may find registering for EFTPS is a little more complicated. once you submit the application and the IRS processes it you receive in the mail a verification code to needed to complete registration. can't say but if your making a 9/15 estimate, and you apply today you may not receive the verification code in time.
you can sign uo for both.
