The main benefits of an EIN are practical: it keeps your Social Security number off business paperwork, lets you open a business bank account and build business credit under the company’s name, and is required before you can hire employees, form a corporation or partnership, make certain tax elections, or run a trust, estate, or nonprofit. The number is free, the online application takes minutes, and once the IRS assigns it, it belongs to that entity for good.
Keeps Your Social Security Number Off Business Paperwork
A sole proprietor or single-member LLC without an EIN has to put a personal Social Security number on tax forms, vendor contracts, W-9s sent to clients, and every 1099 issued to a contractor. Each handoff is another chance for that number to end up where it shouldn’t. Deal with a few dozen clients and vendors over a year and the exposure adds up quickly.
An EIN takes the SSN’s place on almost all of that paperwork. Tax filings, contracts, credit applications, and payment records carry the business number instead, which keeps the owner’s personal identifier out of general circulation.
One boundary worth knowing: the EIN protects the business side only. It doesn’t stop someone from filing a fraudulent personal tax return under your SSN. That’s what the IRS Identity Protection PIN is for — a six-digit code the IRS assigns each year to taxpayers who enroll through their online account, blocking anyone else from filing under their number.1Internal Revenue Service. Frequently Asked Questions About the Identity Protection Personal Identification Number (IP PIN) An EIN plus an IP PIN covers both sides.
Opens the Door to Business Banking and Credit
Almost every bank and credit union asks for an EIN before opening a business checking or savings account. Without one, business income and expenses run through personal accounts. That creates two problems. The bookkeeping gets tangled, and for LLCs and corporations, mixing personal and business money can quietly erode the liability protection the entity was supposed to provide. Courts treat commingled funds as evidence that the entity isn’t genuinely separate from its owner, and once a judge sees it that way, personal assets become fair game for business debts.
A dedicated business account also makes tax season cleaner. Income and expenses tied to the EIN produce the kind of records that make a return easier to prepare and harder for the IRS to question.
The EIN is also what anchors a business credit file. Commercial credit bureaus track payment history under the EIN rather than the owner’s SSN, and over time that history becomes an asset in its own right. Lenders look at it when deciding on loans and credit lines; vendors look at it when deciding whether to extend trade credit and on what terms. A solid business credit profile can mean better rates, higher limits, and eventually financing that doesn’t require a personal guarantee. None of it starts without an EIN.
Required If You Hire Employees or Form Certain Entities
Some uses of an EIN are convenience. Others are legal requirements.
Hiring Anyone
Any business with even one employee must have an EIN. It goes on quarterly payroll tax returns, on wage statements sent to employees, and on everything else the IRS and SSA need to track withholding, Social Security, and Medicare taxes.2Internal Revenue Service. Get an Employer Identification Number There is no small-employer exemption.
Payroll penalties are not forgiving. A deposit one day late costs 2% of the unpaid amount, climbs to 5% at six days, 10% at fifteen days, and 15% once the IRS has sent a demand notice that goes unpaid.3Internal Revenue Service. Failure to Deposit Penalty A missed return brings a separate penalty of 5% of unpaid tax per month, capped at 25%.4Office of the Law Revision Counsel. 26 USC 6651 – Failure to File Tax Return or to Pay Tax An EIN isn’t optional at that stage; it’s the account the whole payroll system runs through.
Entities That Must Have One Regardless
Corporations, partnerships, and multi-member LLCs need an EIN from formation onward, whether or not they have employees.2Internal Revenue Service. Get an Employer Identification Number The IRS treats them as separate taxpayers that can’t file under an individual’s SSN. Sole proprietors with no employees aren’t required to have one, though many apply anyway for the identity and banking benefits above.
Unlocking Tax Elections and Specialized Filings
Certain tax strategies depend on having an EIN already in place. An LLC or corporation that wants to be taxed as an S corporation has to have one before filing Form 2553.5Internal Revenue Service. Instructions for Form 2553, Election by a Small Business Corporation For a profitable small business, that election can meaningfully reduce self-employment tax, which makes the EIN a prerequisite for one of the most common tax moves in small business.
Businesses owing excise taxes, or sponsoring pension, profit-sharing, or retirement plans, also need the EIN for those filings.6Internal Revenue Service. Publication 1635 – Understanding Your EIN States generally want it too, for unemployment tax registration, sales tax permits, and most professional licensing.
Essential for Trusts, Estates, and Nonprofits
Business owners aren’t the only ones who need an EIN. When someone dies, their estate usually earns income from assets before those assets are distributed. The fiduciary needs a separate EIN to report that income on the estate’s own return rather than mixing it with the decedent’s final personal return.6Internal Revenue Service. Publication 1635 – Understanding Your EIN Irrevocable trusts, and revocable trusts that become irrevocable when the grantor dies, need their own EINs for the same reason: the IRS now sees them as separate taxable entities.
Nonprofits can’t even apply for tax-exempt status without one. The EIN is required on Form 1023 and 1023-EZ, and the application won’t go through without it.7Internal Revenue Service. Instructions for Form 1023, Application for Recognition of Exemption Under Section 501(c)(3) After exemption is granted, the same number is used to file the annual Form 990, open bank accounts, accept donations, and apply for grants.8Internal Revenue Service. Exempt Organization Annual Filing Requirements Overview
How to Get One
The IRS doesn’t charge for an EIN. The fastest route is the online application, open Monday through Friday from 6:00 a.m. to 1:00 a.m. Eastern, Saturdays until 9:00 p.m., and Sundays from 6:00 p.m. to midnight. When approved, the number is issued at the end of the session.2Internal Revenue Service. Get an Employer Identification Number
You’ll need your entity type and the Social Security number or taxpayer ID of the responsible party — the individual who owns or controls the entity and manages its funds. That party has to be a person, not another entity, with the sole exception of government agencies.9Internal Revenue Service. Responsible Parties and Nominees The online session can’t be saved and times out after 15 minutes of inactivity, so gather what you need before you start. If online isn’t an option, Form SS-4 can be faxed to 855-641-6935 for roughly a four-business-day turnaround, or mailed to the IRS EIN Operation in Cincinnati, which takes about four weeks.10Internal Revenue Service. About Employer Identification Numbers
One warning. The IRS has said repeatedly that you should never pay for an EIN, yet third-party sites charge up to $300 to fill out the free form on your behalf. Many copy IRS branding, use “IRS” in their domain, or label their tool “EIN Assistant,” which is the actual name of the IRS’s free application.11Federal Trade Commission. FTC Warns Operators of Websites That Charge for Employer Identification Number, Claim Affiliation With IRS If a page is asking for payment, it isn’t the IRS. The real application is at irs.gov and costs nothing.