"Inc." and "Corp." mean the same thing: both mark a corporation, and no rule treats one differently from the other.
The surprise is elsewhere: Delaware law accepts ten other words in their place, and the suffix tells you far less about a US company than it seems to.
The short answer
| Question | Answer |
|---|---|
| Is there a legal difference? | No. Same entity, same liability, same tax |
| What do they stand for? | "Incorporated" and "corporation" |
| Which one does Delaware require? | Either, or one of ten other words |
| Can an LLC use them? | Not as its designator. The LLC statute sets its own words |
| Which one is mine? | The one written in your certificate of incorporation |
What Inc and Corp stand for
Both are abbreviations, and both sit after the name of the same kind of company.
- Inc. abbreviates "incorporated"
- Corp. abbreviates "corporation"
One word describes the act, the other the result. A Delaware corporation exists "from the date of such filing" of its certificate of incorporation (section 106). "Incorporated" says the filing happened, "corporation" names what it produced.
Several published guides promise a list of differences between the two. The statute leaves no room for one: it puts both words in the same list, for the same entity.
The twelve words Delaware law accepts
The rule is section 102(a)(1) of the Delaware General Corporation Law. The certificate of incorporation states the name, which "shall contain 1 of the words" below.
| Word in the statute | Short form you will meet |
|---|---|
| incorporated | Inc. |
| corporation | Corp. |
| company | Co. |
| limited | Ltd. |
| association | abbreviation allowed, none named |
| club | same |
| foundation | same |
| fund | same |
| institute | same |
| society | same |
| union | same |
| syndicate | same |
Three details in the same sentence of the statute matter in practice:
- Abbreviations are allowed, "with or without punctuation". "Inc" and "Inc." both satisfy the rule. The statute names no abbreviation itself.
- One word is enough. The text asks for one of the twelve, not for a combination.
- Foreign equivalents count. Words "of like import of foreign countries or jurisdictions" are accepted, provided they are written in roman characters.
So "Inc." and "Corp." are not two categories. They are two entries in a list of twelve, and "Acme Limited" can be a Delaware corporation as lawfully as "Acme Inc."
When a Delaware corporation needs no suffix at all
The same section lets the Division of Corporations waive the requirement. Two cases are written into the text.
| Case | Condition |
|---|---|
| Large corporation | It files a certificate stating that its total assets are not less than $10,000,000 |
| Professional association | It is a nonprofit corporation that is an association of professionals, at the Division's discretion |
The first case carries a limit:
- The waiver is not available if the name is, or appears to be, that of a natural person
- The corporation must file the asset certificate; the waiver is not automatic
So a Delaware corporation can lawfully carry no suffix at all. The absence of "Inc." proves nothing about what a company is.
3 questions
Which jurisdiction fits you?Answer three questions and get the three jurisdictions that match your situation.
Why an LLC cannot call itself Inc
A limited liability company is formed under a different statute, and that statute has its own naming rule. In Delaware, the name of an LLC "shall contain the words 'Limited Liability Company' or the abbreviation 'L.L.C.' or the designation 'LLC'" (6 Del. C. 18-102).
"Inc." is not on that list, and "Corp." is not either. An LLC that wants either word after its name is asking for the wrong form.
| State and entity | Words the name must contain | Source |
|---|---|---|
| Delaware corporation | One of the twelve words, or an abbreviation | 8 Del. C. 102(a)(1) |
| Delaware LLC | Limited Liability Company, L.L.C. or LLC | 6 Del. C. 18-102 |
| Wyoming LLC | limited liability company, LLC, L.L.C., limited company, LC, L.C., Ltd. liability company, Ltd. liability co. or limited liability co. | W.S. 17-29-108(a) |
| Wyoming corporation | No required word in the section we read | W.S. 17-16-401 |
General Corporation Law, section 102(a)(1).
- One of twelve words, or an abbreviation
- Waiver possible from $10,000,000 in total assets
LLC Act, section 18-102.
- One of three forms, set by its own statute
- Inc. and Corp. are not on the list
Read the Wyoming row twice. A Wyoming LLC may lawfully carry "Ltd." or "co." in its designator, as in "Ltd. liability co."
Does every state require a suffix?
Guides state it as a universal rule. We can only confirm what we read, and it does not support the claim.
- Delaware requires one of twelve words, then allows a waiver.
- Wyoming, in its section on corporate names, bars a name that implies an unauthorized purpose and requires a distinguishable name. The section we read lists no required word.
- Other states were not read for this article. Each state writes its own list.
Before filing anywhere else, read that state's naming section instead of assuming the Delaware list applies.
The suffix does not make a name available
Switching to "Corp." because "Inc." is taken does not work in Delaware.
- Delaware ignores endings when it checks availability (as of July 2026)
- "Acme Inc." on the register blocks "Acme LLC"
- It blocks "Acme Corp." for the same reason
The statute explains the scope. A corporation's name must be distinguishable, on the Division's records, from reserved names and from the names of other entities:
- corporations
- partnerships
- limited liability companies
- statutory trusts
The one exception is the written consent of the other entity. Choose the base name first, then the ending.
What the suffix tells you about a US company
This is the part that matters when you are abroad and reading a counterparty's name on a contract.
| Ending | What it suggests | What it does not settle |
|---|---|---|
| Inc. or Corp. | A corporation | Which state formed it, how it is taxed |
| Co. | Possibly a corporation: Delaware accepts "company" | Whether it is a corporation at all |
| Ltd. | Possibly a Delaware corporation, possibly a Wyoming LLC | The entity type, and even the country |
| LLC or L.L.C. | A limited liability company | Who owns it, how it is taxed |
| No ending | Nothing | Delaware can waive the word for large corporations |
The suffix names a family, corporation or LLC, and stops there. It says nothing about tax status, state of formation or size.
Three labels are often mistaken for suffixes:
- C-Corp is the default corporation, taxed at the entity level. No name ends with it.
- S-Corp is a tax election filed on IRS Form 2553, not a separate entity.
- Delaware or Wyoming appears nowhere in the name unless the founders put it there.
To know what you are dealing with, ask for the state of formation and check the name on that state's register. Whether a corporation or an LLC suits your own project is a different question, covered in choosing between a Delaware LLC and a C-Corp.
Choosing between Inc and Corp, and using it afterward
No legal criterion separates the two, so the choice is one of form.
- Pick the ending that reads well after your base name
- Do not count on it to clear a name that is already taken
- Keep one ending: the statute asks for a single word
Once the certificate is filed, the name it states is the legal name, ending included. Use that form where identity matters:
- contracts and signature blocks
- bank and payment account applications
- filings with the state
Switching from "Inc." to "Corp." later is possible. It is a change of name, so it changes the certificate of incorporation and goes through the state. Check the Division's current fee schedule before deciding it is worth it.
Inc, Corp and Ltd outside the United States
Every country has its own statutory ending, and none of them maps perfectly onto "Inc."
- United Kingdom: "Limited" or "Ltd" for a private company, "PLC" for a public one, "LLP" for a partnership with limited liability
- Singapore: "Private Limited" or "Pte. Ltd." for a private limited company
- United States: "Inc.", "Corp." and the other Delaware words for a corporation
A US corporation is the equivalent of a UK company limited by shares. The British debate has its own twist, which we cover in the UK version of this question, Ltd vs Limited.
The summary
| Question | Answer |
|---|---|
| Inc vs Corp, any legal difference? | None |
| How many words does Delaware accept? | Twelve, plus abbreviations and foreign equivalents |
| Can a corporation have no suffix? | Yes, with a waiver, from $10,000,000 in total assets |
| Can an LLC use Inc or Corp? | Not as its designator |
| Does a different ending free a taken name? | No, Delaware ignores endings |
| Does Ltd mean a UK company? | No |
| What does the suffix prove? | The family at most, never tax, state or size |
Frequently asked questions
Is there a difference between Inc and Corp?
There is no legal difference. Delaware's corporation statute lists "incorporated" and "corporation" side by side as words a corporation's name may contain, and both identify the same entity.
Is Inc the same as Corp?
Yes, in substance. They are two abbreviations for the same type of company, but your company has only one of them in its certificate, and that one is its name.
What does Inc mean after a company name?
It is short for "incorporated". It tells you the business is a corporation, which in Delaware exists from the filing of its certificate of incorporation.
Incorporated vs corporation: which is correct?
Both are correct. Delaware accepts either word, in full or abbreviated, with or without punctuation, and ten other words alongside them.
Can I use Inc if I am an LLC?
Not as your designator. A Delaware LLC's name must contain "Limited Liability Company", "L.L.C." or "LLC", and "Inc." is not on that list.
Does a Delaware corporation have to use a suffix?
As a rule, yes: one of twelve words or an abbreviation. The Division of Corporations can waive it for a corporation certifying total assets of at least $10,000,000.
Is Ltd only for UK companies?
No. Delaware lists "limited" among the words a corporation may use, and Wyoming accepts "Ltd. liability company" for an LLC. The ending alone does not give the country.
Does Co mean corporation?
Not reliably. Delaware accepts "company" and its abbreviations for a corporation, but "Co." alone does not tell you which type of entity you are facing.
Is an Inc a C-Corp or an S-Corp?
The name does not say. Those are tax labels, and the S-Corp is an election filed on IRS Form 2553, not an entity type or a suffix.
Can I change from Inc to Corp later?
Yes. It is a formal change of name, which means a change to the certificate of incorporation filed with the state, so align your contracts and bank records afterward.
Sources
- Delaware General Corporation Law, 8 Del. C. 102(a)(1) and 106
- Delaware Limited Liability Company Act, 6 Del. C. 18-102
- Wyoming Statutes, title 17: W.S. 17-29-108 and W.S. 17-16-401
The Delaware naming rules for corporations and LLCs, the asset-based waiver and the date a corporation's existence begins are quoted from the Delaware Code as published in October 2026. The Wyoming LLC designators are quoted from W.S. 17-29-108. The statement that Wyoming lists no required word for corporations is our reading of W.S. 17-16-401, not an official summary. Other states were not read and are not described. The advice to use the certificate name on documents is practice, not a quoted rule. This is general information, not legal advice.