I have a single member LLC with1099 pay. I have been making quarterly estimated payments (1040ES) through the IRS online system using through my social security number NOT my EIN. Should I have been making making payments through the EIN? How do I go about doing that? When I log into the EFTPS system using my EIN, I do not see an option to make a 1040ES payment, although the IRS website states that I can make 1040ES payment as a sole proprietorship.