Obtain a free Employer Identification Number for the entity.
The EIN is the business's tax ID — the "SSN of the business" that bureaus and banks key to.
Apply free directly at irs.gov. Never pay a third party for an EIN.
Source: IRS (irs.gov)
FREE, directly from the IRS
Separates business and personal money — required for clean books and for many tradelines/cards.
This is general business-credit education, not financial, legal, or tax advice. Confirm specifics with a licensed professional and the official sources directly.