An authorized signatory letter is a formal document a company issues to give a named person the power to sign contracts, checks, or other binding paperwork on the company’s behalf. It works only if it rests on the right internal authority, describes the signer’s power precisely, is executed in a way third parties will accept, and is revoked cleanly when the situation ends. Get any of those pieces wrong and the company may be bound to deals it never approved, or the signer may end up personally liable.
Start With a Board Resolution
The letter is the outward-facing document. The board resolution is the internal decision that gives the letter something to stand on, and skipping it is where most problems begin. A signatory letter says “this person can sign for us,” but without a resolution granting that power, the letter may lack the corporate authority to back it up.
The resolution should name the authorized individual by full legal name and title, specify what types of documents they can sign, and state the effective date. The corporate secretary or another officer, not the person receiving the authority, signs the resolution and enters it in the company’s official minutes. Banks in particular expect to see a certified copy of this resolution when a new signatory is added to an account, and some will hand you their own resolution template to complete.
What to Include in the Letter
The letter translates the board’s internal decision into a format outside parties can verify. Print it on official company letterhead: banks and government agencies treat letterhead as an authenticity marker and may reject letters without it.
Every authorized signatory letter should contain:
- Full legal name of the company, its address, state of incorporation, and any registration numbers.
- Name and title of the person issuing the authority, usually the CEO, president, or corporate secretary.
- Full legal name, title, and identification details of the person receiving signing authority. The name must match government-issued ID exactly.
- A precise scope of authority. This is where vague drafting causes the most damage. “Authorized to sign all documents” is dangerously broad. Better: “authorized to sign vendor contracts with a total value not exceeding $50,000” or “authorized to sign checks drawn on [specific account] up to $10,000 per transaction.”
- The date the authority begins and the date it ends. Open-ended letters are common but create revocation headaches later.
- A statement referencing the board resolution that granted the authority, with the resolution’s date.
Specific dollar limits, named accounts, and defined transaction types protect both the company and the signer. Broad language protects neither.
Signing and Notarizing the Letter
Execution turns a draft into an enforceable document. The authorizing officer signs in their official capacity, and many organizations require a second officer or a disinterested party to witness the signature as protection against forgery claims. Print the signer’s name and title directly below the signature so there is no ambiguity about who signed or in what capacity.
The form of the signature carries legal weight. Under UCC Article 3, when a representative signs an instrument and the signature clearly shows it was made on behalf of an identified company, the representative is not personally liable on that instrument. If the signature is ambiguous about whether it was made in a representative capacity, the signer can be held personally liable to a third party who relied on it in good faith.1Legal Information Institute. Uniform Commercial Code 3-402 – Signature by Representative Both the signatory letter and any documents later executed under it should identify the company name, the signer’s name, and the signer’s title.
Most banks and many government agencies require the letter to be notarized. The notary verifies the signer’s identity using government-issued identification, confirms the signer is acting willingly, and applies an official seal or stamp. Notarization does not verify the contents of the letter or the scope of authority; it only confirms who signed. Notary fees for a single acknowledgment typically run between $5 and $25.
Electronic execution is valid if your counterparty accepts it. The Electronic Signatures in Global and National Commerce Act provides that a signature or contract cannot be denied legal effect solely because it is in electronic form.2Office of the Law Revision Counsel. 15 USC 7001 – General Rule of Validity The Uniform Electronic Transactions Act, adopted in 49 states plus the District of Columbia, produces the same result at the state level. Both parties must consent to conducting business electronically, the signer must intend to sign, and the system must retain an accurate record of the signature and the document it is attached to. Some categories, including wills, certain trusts, and powers of attorney in some jurisdictions, are excluded from these laws; a standard business signatory letter generally is not, but check your state if the letter grants authority that overlaps with a traditional power of attorney.
When a Signatory Letter Is the Wrong Document
A signatory letter is a corporate document. It flows from the company’s board or an authorized officer to an employee or agent and delegates specific signing authority for business transactions. The company, not any individual, is the principal.
A power of attorney is broader and more personal. It authorizes one person to act on behalf of another person or entity across a wider range of legal matters, and it comes in general, limited, durable, and medical forms governed by state statutes with their own formality requirements. A durable power of attorney remains effective if the person granting it becomes incapacitated; a corporate signatory letter has no equivalent. Banks and financial institutions sometimes require a specific power of attorney form rather than a signatory letter for certain high-value or sensitive transactions.
A signatory letter also has no effect at the IRS. To represent a business before the IRS during an audit, appeal, or agreement, file Form 2848, Power of Attorney and Declaration of Representative.3Internal Revenue Service. About Form 2848, Power of Attorney and Declaration of Representative The representative named on Form 2848 must be eligible to practice before the IRS, such as an attorney, CPA, enrolled agent, or in limited circumstances a full-time employee of the company.4Internal Revenue Service. Instructions for Form 2848 If someone only needs to access tax information without representing you, use Form 8821, Tax Information Authorization; Form 8821 lets a designee inspect or receive confidential tax information but does not authorize the designee to speak on your behalf, negotiate refund checks, sign waivers, or advocate your position in any dispute.5Internal Revenue Service. Instructions for Form 8821
Delivering the Letter to Third Parties
Once the letter is fully executed and notarized, it has to reach the right people through the channels they expect.
Banks typically require the original letter presented in person at a branch, along with a certified copy of the board resolution and government-issued identification for the new signatory. The bank verifies the agent’s identity against its records and updates its account authorization files. Expect a verification period before the new signatory can transact.
Private vendors and software providers often accept digital copies uploaded to contract management platforms or sent by encrypted email. Some issue a formal acknowledgment or confirm that the agent’s profile has been updated. Government agencies may require a certified copy by registered mail.
Keep a log of every entity that receives a copy of the letter. It looks like paperwork you don’t need until you go to revoke the authority and have to notify each party that relied on it.
Using the Letter Abroad
A notarized signatory letter from the United States may not be recognized abroad without additional authentication. For countries that are members of the 1961 Hague Apostille Convention, attach an apostille certificate to the letter. An apostille confirms the notary’s signature and seal are genuine and is recognized by all member countries without further legalization. For documents notarized at the state level, the apostille comes from the secretary of state’s office in the state where the notary is commissioned. For documents tied to federal agencies, the U.S. Department of State’s Office of Authentications handles the apostille.6U.S. Department of State. Office of Authentications
Mailing your request to the State Department takes roughly five weeks. Walking in to drop off documents cuts the timeline to about two to three weeks. Same-day emergency appointments are available only in life-threatening circumstances involving immediate family abroad.6U.S. Department of State. Office of Authentications
For countries outside the Hague Convention, expect a longer path: state-level certification, then U.S. Department of State certification, then authentication by the destination country’s embassy or consulate. Build extra weeks into the timeline.
Expiration and Revocation
Every signatory letter should state when the authority expires. A specific end date is cleanest. Some letters tie the authority to the agent’s employment or a particular project, so it lapses automatically when the person leaves or the project ends. Letters without any expiration language technically remain effective until formally revoked, which is why open-ended letters are risky: they create authority that outlives the situation that justified it.
To revoke, draft a written revocation letter that identifies the original authorization by date and states that the agent’s signing authority is terminated as of a specific date. Have the revoking officer sign it and keep a copy in the company’s records with the original letter.
Internal revocation alone does not protect the company from third parties who don’t know about it. Under agency law, ending an agent’s actual authority does not automatically end their apparent authority. If a bank or vendor reasonably believes the agent still has permission to sign, because no one told them otherwise, the company can be bound by whatever that former agent signs. This lingering apparent authority has trapped companies into honoring contracts they never intended to make.
The fix is prompt, documented notification. Send written notice of the revocation to every third party that received the original letter. That is when the log of recipients earns its keep.
Personal Liability for Signing Without Authority
When someone signs a document claiming to represent a company but lacks the authority, two things happen. The company is generally not bound unless it ratifies the deal or the third party can establish apparent authority. And the unauthorized signer faces personal liability under the implied warranty of authority, an agency law doctrine holding that anyone who claims authority to act for another implicitly guarantees that the authority exists.
If that guarantee turns out to be false, the signer is personally liable for the third party’s losses, even if the signer honestly believed they had authority and acted in good faith. The defenses are limited: the company later ratified the act, the signer explicitly disclaimed authority before the transaction, or the third party already knew the signer lacked authority.
UCC Article 3 reinforces the same idea for negotiable instruments. If a representative signs an instrument without clearly indicating their representative capacity or without identifying the company, the signer can be personally liable to anyone who took the instrument in good faith without notice that the signer was not meant to be personally responsible.1Legal Information Institute. Uniform Commercial Code 3-402 – Signature by Representative Always identify the company, always sign in a clearly representative capacity, and never sign anything that exceeds the scope of the authorization letter.