The main benefits of an EIN for sole proprietors are keeping your Social Security number off client and vendor paperwork, opening a business bank account and building credit under the business’s name, and being ready to hire employees, file excise tax returns, or set up a retirement plan when the time comes. The IRS issues the number for free, and the online application takes about 15 minutes.
Keep Your Social Security Number Off Client Paperwork
Every business form that asks for a taxpayer ID is another copy of the number tied to your credit, your tax returns, and your identity. An EIN gives you an alternative. On Form W-9, sole proprietors with an EIN can enter either their SSN or their EIN.1Internal Revenue Service. Form W-9 (Rev. March 2024) The IRS encourages sole proprietors to use their SSN, but the EIN is accepted. Choosing it means one fewer place your SSN sits in someone else’s files.
The same logic covers vendor applications, business licenses, and permit paperwork. An EIN is designed for commercial use, so a leak is nothing like a compromised SSN. Keep in mind the IRS is clear that an EIN is strictly for business activities; you still need your SSN for personal tax filings and anything unrelated to the business.2Internal Revenue Service. IRS Publication 1635 – Understanding Your EIN
Open a Business Bank Account and Build Business Credit
Mixing personal and business money creates a bookkeeping headache at tax time. A dedicated business account fixes that. Some banks will open one for a sole proprietor with just an SSN, others ask for an EIN, so having the number ready keeps your options open. The IRS notes that sole proprietors who don’t otherwise need an EIN can still request one for banking purposes.3Internal Revenue Service. Employer Identification Number
A separate account also lays the groundwork for a business credit profile that stands apart from your personal score. When you apply for a business credit card or loan using your EIN, lenders can evaluate the company’s own track record. Over time that separation helps if you need larger financing, because lenders see a business with its own history rather than an individual borrowing more money.
Be Ready to Hire Employees
The moment you bring on even one employee, an EIN stops being optional. The IRS requires it to report federal income tax withholding, Social Security tax, and Medicare tax.3Internal Revenue Service. Employer Identification Number Without one, you cannot file employment tax returns or issue W-2s at year-end, and late or missing filings can trigger penalties.
Getting the number before you actually hire removes one thing to scramble for when you find the right candidate. Payroll providers, workers’ compensation carriers, and state workforce agencies all ask for it during setup.
File Excise Tax Returns
Some sole proprietors sell products or work in industries that trigger federal excise taxes. If your business files returns related to alcohol, tobacco, or firearms taxes, the IRS requires an EIN for those filings.3Internal Revenue Service. Employer Identification Number The same applies if you withhold tax on payments to a nonresident alien. These requirements hold whether or not you have employees.
Set Up a Retirement Plan
Access to tax-advantaged retirement plans catches many sole proprietors off guard. A solo 401(k), sometimes still called a Keogh plan, lets a self-employed person contribute as both employer and employee, which can substantially increase annual retirement savings compared with a simple IRA. Most plan administrators require an EIN as part of setup, because the plan is technically sponsored by the business rather than the individual. If retirement savings are on your radar, an EIN is a practical first step.
How to Apply for Free
The application is IRS Form SS-4, and you can submit it online, by fax, or by mail. The online route is fastest: the IRS issues your number immediately, and the process runs about 15 minutes. Faxing takes roughly four business days. Mailing takes four to five weeks.4Internal Revenue Service. Instructions for Form SS-4
If you don’t have a Social Security number and aren’t eligible for one, you can apply for an Individual Taxpayer Identification Number using Form W-7, then use that ITIN on your EIN application.5Internal Revenue Service. U.S. Taxpayer Identification Number Requirement
The IRS never charges for an EIN.6Internal Revenue Service. Get an Employer Identification Number That hasn’t stopped third-party websites from charging up to $300 to fill out the same free form on your behalf. Some use IRS logos, color schemes, and domain names built to look official. The FTC has warned operators of these sites that mimicking a government agency may violate federal law and has flagged them for potential enforcement action.7Federal Trade Commission. Don’t Pay to Get Your Employer Identification Number (EIN) If a site asks for payment before issuing the number, close the tab and go directly to the IRS.
When You Would Need a New EIN Later
Your EIN stays with your sole proprietorship through name changes, new locations, and additional businesses under the same ownership.8Internal Revenue Service. When to Get a New EIN You do need a new one if you incorporate, form a partnership by bringing in a co-owner, or declare bankruptcy. For a business name change alone, notify the IRS in writing at the address where you filed your most recent return; no new number is involved.9Internal Revenue Service. Business Name Change