A contract binds a business only when the person signing it has authority to act for that business. That authority comes in three forms — actual, implied, or apparent — and the answer to who can sign a contract on behalf of a business depends on the entity type, what the business has told the signer, and what the business has led the outside world to believe. Get it wrong and the deal may not hold: the business can walk away, and the person who signed can end up personally on the hook.
The Three Kinds of Signing Authority
Actual authority is the most direct. It exists when the business itself grants someone the power to sign, whether through a written document, a verbal instruction, or a formal corporate action. A board of directors might pass a resolution naming a specific officer as the authorized signer for all contracts above a certain dollar amount. A business owner might tell a manager in writing that she can sign supply orders up to $10,000. The common thread is a clear grant of power flowing from the business to the signer.
Implied authority fills in the gaps around whatever actual authority has been granted. When someone is authorized to handle a particular job, they pick up the authority to do whatever is reasonably necessary to get that job done. A manager authorized to hire new employees has the implied authority to negotiate starting salaries and agree on start dates, because those steps are inseparable from the hiring process. Courts look at what a reasonable person in the signer’s position would believe they were authorized to do, given the instructions received and the nature of the role.
Apparent authority works differently. It doesn’t come from what the business tells its own people. It comes from the business’s behavior toward the outside world. When a company’s words or conduct lead a third party to reasonably believe someone has power to act on the company’s behalf, apparent authority exists, and the company can be bound by whatever that person does within the scope of that reasonable belief.
The focus is entirely on what the third party sees and whether the belief is traceable to something the company did or allowed. Giving someone the title “Vice President of Procurement” and letting that person negotiate deals for months creates the appearance of authority, regardless of internal limits. Letting an employee use company letterhead, providing a corporate email signature, or failing to object when they repeatedly sign contracts all contribute to the appearance that the person can bind the company. Even if the company explicitly told the employee not to sign a particular deal, the company can still be bound if its prior conduct gave the third party good reason to believe the employee had authority.
Who Can Sign for Different Types of Businesses
The rules for who can bind a business depend heavily on what kind of entity it is. This is where verification mistakes tend to happen.
Corporations
In a corporation, signing authority flows from the board of directors. The board passes resolutions granting specific officers the power to sign contracts, often with defined limits on dollar amount or transaction type. A corporate resolution typically names the authorized individual by name and title and specifies the categories of agreements they can execute. Officers like the CEO or CFO usually hold broad authority, while lower-level managers may have signing power only within a narrow range of routine transactions.
Limited Liability Companies
LLCs are trickier. Authority depends on whether the LLC is member-managed or manager-managed, a distinction that should appear in the articles of organization or operating agreement. In a member-managed LLC, every member has the right to participate in running the business, and any member can generally bind the LLC in the ordinary course of business. In a manager-managed LLC, only designated managers have that power, and members who aren’t managers typically cannot bind the company.
Under the Uniform Limited Liability Company Act adopted in many states, being a member alone does not automatically make someone an agent of the LLC. The act also allows an LLC to file a statement of authority with the Secretary of State, publicly declaring who has power to sign on its behalf and what limits exist on that power. A third party who gives value in reliance on a filed statement of authority is generally protected, which makes these filings a useful verification tool when they exist.
Partnerships
General partnerships create the broadest default authority. Every partner in a general partnership is generally an agent of the partnership for purposes of carrying on its ordinary business. A partner’s act in the ordinary course binds all the other partners, even if that partner had no actual authority for the specific transaction, unless the third party knew about the limitation. Limited partnerships and limited liability partnerships restrict this default authority for limited partners, who typically cannot bind the partnership.
What Happens When the Signer Lacked Authority
When someone signs a contract without actual, implied, or apparent authority, the agreement is not binding on the business they claimed to represent. The business can treat the contract as voidable and walk away. The third party is left holding a contract the other side won’t honor.
The signer, meanwhile, faces personal exposure. Under longstanding agency law principles, anyone who claims to act on behalf of another gives an implied warranty to the third party that they actually have the power to do so. If that warranty turns out to be false, the signer is personally liable for the third party’s losses, even if they genuinely believed they had authority. Good faith is not a defense.
Damages can be substantial. The third party can recover money spent performing their side of the deal, the expected benefit of the bargain they lost, and in some cases foreseeable business losses that flowed from the contract falling apart. The unauthorized signer effectively steps into the shoes of the business they claimed to represent and bears the financial consequences of the deal’s failure.
When unauthorized signing crosses from honest mistake into deliberate deception, the exposure escalates. If someone knowingly lies about their authority to induce a third party into a contract, they may face a claim for fraudulent misrepresentation, which requires showing a false statement about authority, knowledge or recklessness as to its falsity, intended reliance, and actual harm. Unlike the implied warranty of authority, fraud opens the door to punitive damages and potential criminal prosecution.
Ratification: The Business’s Escape Valve
A business that learns about an unauthorized contract and decides it actually wants the deal can ratify it. Ratification retroactively validates the agreement, making it binding as if the signer had authority all along.
Ratification can be explicit, like a board resolution approving the deal after the fact, or implied through conduct. Accepting the benefits of a contract, using goods delivered under it, or failing to repudiate the deal within a reasonable time can all constitute ratification. The principal must have knowledge of the material facts surrounding the unauthorized agreement and must manifest an intent to be bound.
How to Verify Authority Before Signing
Verifying authority before signing is far cheaper than litigating it afterward. Match the level of diligence to the size and risk of the deal, but run basic checks even on modest transactions.
Request Written Documentation
The strongest evidence of authority is a written document from the business itself. For a corporation, ask for a copy of the board resolution authorizing the signer. A properly drafted resolution names the individual, specifies what types of agreements they can sign, and bears the approval of the board. For an LLC, ask for the relevant section of the operating agreement showing whether the company is member-managed or manager-managed, and confirming that the person you’re dealing with falls into the category that holds signing power. In states that have adopted the uniform LLC act, you can also check whether the company has filed a statement of authority with the Secretary of State.
A Power of Attorney is another common authorization document, particularly for one-off transactions or situations where the principal cannot sign personally. A valid Power of Attorney should clearly identify the principal, name the agent, and define the scope of authority being granted. For real estate transactions, the Power of Attorney typically must be notarized and may need to be recorded with the county.
Look Beyond the Job Title
Job titles are unreliable indicators of authority. A “Director of Business Development” title might carry significant signing power at one company and none at another. Senior-sounding titles like “Vice President” are sometimes granted liberally without any corresponding authority to bind the company. Even a CFO’s authority may be limited to certain transaction types or dollar thresholds. Ask for documentation that backs up whatever the title suggests.
Confirm Directly for High-Value Deals
For large or unusual transactions, go straight to the source. Contact a senior officer, the company’s general counsel, or the board directly to confirm the person across the table has authority to sign the specific deal on the table. This verifies actual authority and creates a record of the company’s own manifestation, which protects you under apparent authority principles if the deal is later challenged. Document the confirmation in writing, even if it’s just an email exchange.
Watch for Red Flags
Certain situations should trigger extra scrutiny. A signer who resists providing documentation, a deal that seems outside the normal scope of the company’s business, an unusually junior person signing a high-value contract, or pressure to close quickly without time for verification are all warning signs. The presence of a corporate seal on a document, while sometimes reassuring, is not a substitute for verified authority. Modern U.S. law generally does not require a corporate seal for a valid contract, and the signature of an authorized officer is legally sufficient. Some foreign jurisdictions still require seals, so international transactions may warrant additional inquiry.
Build Representations Into the Contract
A well-drafted contract includes a representation by each signer that they have the authority to bind their respective entity. The representation doesn’t prevent an unauthorized signing, but it gives you a clear breach-of-contract claim if the signer’s authority turns out to be deficient. Combined with proper due diligence, it creates multiple layers of protection.
A Note on Electronic Signatures
Under the Electronic Signatures in Global and National Commerce Act, a signature or contract cannot be denied legal effect solely because it is in electronic form. An electronic signature is broadly defined as any electronic sound, symbol, or process attached to a contract and adopted by a person with the intent to sign. What the E-SIGN Act does not change is the underlying authority question. An electronic signature by someone without authority is just as invalid as an ink signature by someone without authority. If anything, the convenience of electronic execution increases the risk, because it’s easier for the wrong person to click “sign” in a document platform than to forge a physical signature on paper. Every verification step above applies equally to electronically signed contracts.