Hello and thank you for your question. I see from your question you have a single member LLC with an EIN. Due to the business structure the entity is considered a disregarded entity for tax purposes. What that means is you will just file a regular schedule C for tax purposes as you normally would as if you were a sole proprietorship. Based on that information the estimated tax payments should be done under your social security number as instructed by IRS and should be the same for state taxes for estimated tax payments. However, please check if there is a separate LLC return and/or additional fees based on your state guidelines. I hope this answered your question and you have a wonderful day.
