Do I Need a New EIN? The Full Scenario Table
Last updated September 4, 2026 · Written by the EIN Registration filing team
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An EIN identifies a taxpayer: a person acting as a sole proprietor, a partnership, a corporation, an estate, a trust. It is not attached to a business name, an address, or a bank account. So the test is always the same: after the change, is the IRS looking at the same taxpayer with different details, or at a different taxpayer? Different taxpayer, new EIN. Same taxpayer, keep it and update the details. An EIN is never reassigned and never expires, so the old number stays with the old entity even after you stop using it.
Sole proprietor
| What changed | New EIN? | Why |
|---|---|---|
| Change the business name or DBA | Keep it | Same taxpayer. Tell the IRS on your next return or by letter. |
| Move, or open a second location | Keep it | Location is not part of the identity the EIN tracks. |
| Start a second side business | Keep it | One person, one EIN. Every sole proprietorship you own shares it. |
| Form a single-member LLC | Depends | The LLC is a new state entity. Get it an EIN of its own so the bank account and payroll are in the LLC's name; see below. |
| Take on a partner | New EIN | A partnership is a separate taxpayer that files its own return. |
| Incorporate | New EIN | The corporation is a new taxpayer. Your old EIN stays with you personally. |
| File for bankruptcy | New EIN | The IRS lists this explicitly for sole proprietors, and only for sole proprietors. |
The single-member LLC row. The IRS technically lets a single-member LLC with no employees keep reporting under the owner’s number, because for income tax it is disregarded. In practice almost every owner gets the LLC its own EIN: the bank wants the account in the LLC’s name and number, and the LLC must have its own EIN the day it hires or owes excise tax. Your sole proprietor EIN does not transfer to the LLC; it stays yours. When to apply, relative to the state filing.
Partnership
| What changed | New EIN? | Why |
|---|---|---|
| Change the name or location | Keep it | Same partnership. |
| A partner joins or leaves and the partnership continues | Keep it | An ownership change that does not terminate the partnership keeps the number. |
| Convert to an LLC that is still taxed as a partnership | Keep it | The IRS says so directly. The tax classification did not change. |
| File for bankruptcy | Keep it | Unlike a sole proprietor, a partnership keeps its EIN through bankruptcy. |
| One partner takes over and runs it alone | New EIN | The partnership ended. The survivor is a sole proprietor and uses their own EIN or SSN. |
| Close one partnership and start another | New EIN | New partnership, new taxpayer, even with the same people. |
| Incorporate | New EIN | The corporation is a different entity. |
“Continues” is the word that matters in the second row. A partnership that keeps operating with a changed roster is the same partnership. One that winds up, distributes its assets, and is replaced by a new agreement among new people is a new one, even if the name on the door does not change.
Corporation
| What changed | New EIN? | Why |
|---|---|---|
| Change the name or location | Keep it | Same corporation. |
| Elect S-corp status | Keep it | Form 2553 is a tax election on the existing EIN. There is no such thing as an S-corp EIN. |
| File for bankruptcy | Keep it | A corporation in bankruptcy keeps its number. |
| Survive a merger | Keep it | The surviving corporation keeps its EIN; the absorbed one is closed. |
| Reorganize but change only identity, form, or place | Keep it | The IRS lists this as a no-new-EIN reorganization, including a state-level conversion that leaves the structure alone. |
| Get a new charter (reincorporate, often in another state) | New EIN | A new charter is a new corporation in the IRS's eyes. |
| Merge and create a brand-new corporation | New EIN | Neither old entity survived. |
| Become a subsidiary of another corporation | New EIN | A subsidiary is its own entity and needs its own number; a division is not. |
| Convert to a partnership or sole proprietorship | New EIN | The corporation ended. |
The reincorporation row catches people moving a company from one state to another. Filing new articles in the new state is a new charter and a new corporation. A statutory conversion or domestication that the state treats as the same entity continuing is the “identity or place” case and keeps the EIN. Which one you did is on the paperwork your state accepted; when in doubt, that is what to show your accountant.
LLC
| What changed | New EIN? | Why |
|---|---|---|
| Change the name or location | Keep it | Same LLC. |
| Elect to be taxed as a C-corp or S-corp | Keep it | Form 8832 or 2553 changes the tax classification, not the entity. The EIN stays. |
| Single-member LLC adds a second member | Keep it | The LLC becomes a partnership for tax purposes, which is a classification change. An LLC keeps its EIN through a classification change; see the note below. |
| Multi-member LLC drops to one member | Keep it | Same rule in reverse. The LLC is now disregarded but keeps its number for payroll and the bank. |
| Single-member LLC hires its first employee | Depends | If the LLC already has its own EIN, keep it. If it was operating under your SSN or sole proprietor EIN, it now needs an EIN of its own for employment taxes. |
| Dissolve the LLC and form a corporation or partnership | New EIN | The new entity is a new taxpayer. |
Why adding a member keeps the EIN. The regulation under section 6109 says an entity that has an EIN keeps it when only its federal tax classification changes. A one-member LLC gaining a second member goes from disregarded to partnership, which is a classification change, so the LLC keeps its number and starts filing Form 1065 under it. The exception is an LLC that never had its own EIN and was running under the owner’s SSN or sole proprietor EIN: that LLC now needs a number of its own, and that is an application for the LLC, not a replacement of yours. EIN for a partnership or multi-member LLC.
Estate and trust
| What changed | New EIN? | Why |
|---|---|---|
| Estate: a new executor or administrator is appointed | Keep it | The estate is the taxpayer, not the person running it. |
| Estate: the executor's address changes | Keep it | Update it on the next Form 1041 or with Form 8822-B. |
| Estate: estate funds are used to create a trust | New EIN | The trust is a separate taxpayer from the estate. Two numbers. |
| Estate: the executor keeps running the decedent's sole proprietorship | New EIN | The decedent's EIN died with them. The estate needs its own. |
| Trust: the trustee changes | Keep it | Same trust. Report the new trustee with Form 8822-B. |
| Trust: grantor or beneficiary changes name or address | Keep it | Same trust. |
| Trust: a revocable trust becomes irrevocable (usually at the grantor's death) | New EIN | While revocable it reported under the grantor's SSN. Now it is its own taxpayer. |
| Trust: a living trust becomes a testamentary trust, or a trust becomes an estate | New EIN | Different taxpayer in each case. |
| Trust: one grantor creates several trusts | New EIN | One EIN per trust, generally. |
The revocable-to-irrevocable row is the one most families hit. A living trust does not need an EIN while the grantor is alive; it uses their SSN. At death it becomes irrevocable and becomes its own taxpayer, and the trustee applies for an EIN then. How to get an EIN for a trust after a death. An executor who also administers a trust created by the will needs two numbers, one for the estate and one for the trust.
If you keep the EIN, tell the IRS what changed
Keeping the number does not mean the IRS knows about the change. A name change is reported on the next return or by letter, depending on entity type. How to change the name on an EIN. A new address or a new responsible party goes on Form 8822-B, and the responsible party change is required within 60 days. A tax classification change is Form 8832 or Form 2553, filed on the same EIN.
If you get a new EIN, close the old one properly
The old entity still has to file its final return, marked final, and issue final W-2s or 1099s if it had any. Then you can ask the IRS to close the old business account by letter. How to close an EIN account. Do not keep using the old number for the new entity: payments, payroll deposits, and 1099s reported under the wrong EIN are the mismatch letters you will spend next year answering.
Quick answers
I applied for a new EIN and did not need one. What now?
Use the original number and send the IRS a letter closing the extra one, quoting the EIN, the entity name and address, and the reason. The number is not deleted, only marked inactive, so nothing breaks if a form already went out under it.
Does moving my business to another state require a new EIN?
Not by itself. A sole proprietor or an LLC that registers as a foreign entity in the new state keeps its number. A corporation that dissolves in the old state and incorporates fresh in the new one has a new charter and needs a new EIN.
Does the EIN change when I convert an LLC to a corporation?
If you only elect corporate tax treatment with Form 8832 or 2553, no. If you legally dissolve the LLC and form a corporation, yes. A statutory conversion that the state treats as the same entity continuing usually keeps the EIN under the identity-or-form rule, but confirm with the IRS business line before the first payroll deposit.
My EIN was issued to my old business years ago. Can I reuse it for a new one?
If both are sole proprietorships, yes, it is the same taxpayer. If the new business is an LLC, partnership, or corporation, no: that entity needs its own number. Do I need an EIN at all?
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Related guides
- Do I Need an EIN? (Every Situation, Answered) Banks require one in almost every case and the IRS requires one in six. Single-member LLC, sole proprietor, DBA, no employees, contractor, rental property, and the bank account question, each answered plainly.
- EIN Before or After the LLC? (And Whether You Need an LLC at All) Form the LLC first, then apply for the EIN in the LLC's name. Why the order matters, what happens if you did it backwards, and how to get an EIN with no LLC at all.
- Changing Your EIN's Business Name, Address, or Responsible Party An EIN is permanent, but the record behind it can be updated. Which changes are a letter, which are Form 8822-B, and which changes actually require a brand new EIN.
- How to Cancel or Close an EIN An EIN is never reused or deleted, but the IRS will close the business account tied to it. When that is worth doing, what to write in the letter, and why a wrong EIN is a different fix.
- EIN for a Trust After the Grantor Dies A revocable living trust stops using the grantor's SSN the day they die. What the successor trustee has to do, and why the estate may need a second number.
- EIN for a Partnership or Multi-Member LLC Mandatory, because a partnership files Form 1065 and issues K-1s. When to apply, which partner is the responsible party, and how the SS-4 differs from a single-owner application.
Sources
EIN Registration is an independent document preparation and filing service and is not affiliated with the IRS or any government agency. You can also apply for an EIN directly with the IRS at irs.gov at no cost.