When Do You Need a New EIN? A Complete Guide Based on IRS Rules

This article provides a detailed overview of when you need to apply for a new EIN and when you don’t, based on IRS guidelines. Avoid delays and unnecessary reapplications with this official breakdown.

If you’re using an Employer Identification Number (EIN), a common question arises:
Do I need to apply for a new EIN?

The IRS provides specific rules on when a new EIN is required and when your current EIN remains valid despite changes in your business. Below is a practical summary of the official guidance that helps you avoid unnecessary paperwork and tax issues.


1. When You Must Apply for a New EIN

Regardless of whether you are a sole proprietor, partnership, corporation, or trust, the following changes typically require a new EIN:

Sole Proprietors
  • You add a partner and become a partnership.
  • You incorporate your business (form an LLC or Corporation).
  • You establish a retirement or profit-sharing plan.
  • You file for bankruptcy under Chapter 7 or Chapter 11.
Partnerships
  • The business becomes a sole proprietorship or corporation.
  • The original partnership ends, and a new one is formed with different partners.
  • One partner buys out the others and continues as a sole proprietor.
Corporations
  • You form a subsidiary that needs its own EIN.
  • Your business merges and forms a new legal entity.
  • You receive a new corporate charter or change legal structure.
  • The corporation changes to a sole proprietorship or partnership.
Trusts and Estates
  • A living trust becomes a testamentary trust.
  • The revocable trust becomes irrevocable.
  • You create a trust from estate funds.

2. When You Do NOT Need a New EIN

The following changes do not require you to apply for a new EIN:

General Business Changes
  • You change the name of your business.
  • You move or open new business locations.
  • You change owners, officers, or trustees (without legal structure change).
  • Your corporation declares bankruptcy (unless a liquidating trust is created).
Spouse-Owned Businesses

Under the Small Business and Work Opportunity Tax Act of 2007, a husband and wife running a jointly owned business can elect to be treated as a Qualified Joint Venture, allowing them to avoid applying for a partnership EIN.


3. Summary

Not every business change requires a new EIN.

Understanding IRS rules helps you avoid unnecessary delays, duplicate applications, and compliance issues.


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  • Evaluating your business situation;
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