EIN vs. SSN for Opening a Business Bank Account: What's the Difference?
Applying to open a business bank account, and getting asked for an EIN when only a Social Security number was expected, is a common enough moment of confusion for new business owners.
The short answer
A sole proprietor with no employees can often open a business bank account using their Social Security number (SSN), since the business isn’t a separate legal or tax entity. Businesses structured as an LLC, corporation, or partnership, or any sole proprietor with employees, generally need an employer identification number (EIN) instead, because the IRS requires it for those structures.
Why the requirement depends on business structure
An EIN functions like a Social Security number for a business — a unique identifier used for tax reporting. Because a sole proprietorship isn’t legally separate from its owner, the IRS generally allows the owner’s own SSN to stand in for tax identification purposes unless the business meets specific conditions, like having employees. Structures such as LLCs and corporations are treated as more distinct from their owners, which is generally why an EIN becomes a requirement rather than an option for those entities. This is part of why banks often ask different questions when opening business checking versus personal checking, since the underlying entity type shapes what documentation is needed.
When an EIN is generally required
- The business has employees. Any business that pays wages typically needs an EIN for payroll tax reporting, regardless of its legal structure.
- The business is an LLC, corporation, or partnership. These structures are generally required to obtain an EIN as part of their formation and tax filing, even without employees.
- The business elects certain tax treatments. Some sole proprietors choose to have their business taxed differently than the default, which can trigger an EIN requirement.
- A bank simply requires it as policy. Even when not strictly mandated by the IRS, some banks require an EIN for any business account as a matter of internal policy, regardless of structure.
Why many sole proprietors get an EIN anyway
Even when an SSN would technically work, many sole proprietors choose to obtain an EIN voluntarily. Using an EIN on business paperwork and invoices avoids sharing a personal SSN more broadly than necessary, which can reduce exposure to identity theft. It can also make a later transition to an LLC or corporation simpler, since the business will already be used to operating with a dedicated tax identifier separate from the owner’s personal number. Organizations other than sole proprietors, such as nonprofits opening a bank account, generally don’t have the same option and need an EIN from the start regardless of size.
What to weigh before applying
Because bank requirements can vary even within the same legal category, it’s worth checking directly with the specific bank about what documentation it requires before assuming an SSN alone will be sufficient. Obtaining an EIN is generally a free and fairly quick process through the IRS, so cost is rarely the deciding factor — the bigger question is usually whether the business structure or future plans make a dedicated identifier worthwhile now rather than later.
The bottom line
Whether a business can open an account with an SSN or needs an EIN mostly comes down to legal structure and whether the business has employees, not personal preference. Sole proprietors have more flexibility here than other structures, but that flexibility doesn’t mean an EIN is never worth getting anyway.