Business letterhead requirements come from a patchwork of state corporate statutes, industry regulators, and a handful of federal laws aimed at specific fields. There is no single federal rule that lists what every U.S. business must print at the top of its stationery. What you need depends on three things: your entity type, your industry, and where you operate. Every business shares a baseline, and regulated industries layer additional disclosures on top.
The Baseline Every Business Needs
Start with your entity’s full legal name exactly as it appears on your formation documents. Most states require registered business entities to include a designator in the name, such as “LLC,” “Inc.,” or “Corp.,” and that designator belongs on your letterhead. Courts have occasionally treated the omission of a corporate designator as evidence that an entity wasn’t properly holding itself out as a separate legal person, which can weaken the liability shield that incorporation or LLC formation is supposed to provide.
Show a physical office address. A P.O. Box may work for general mail, but many states require registered business entities to maintain an actual office location on file with the secretary of state. Don’t use your registered agent’s address. A registered agent’s office exists to receive legal documents on your behalf; it is not your company’s business address, and listing it as such creates confusion in both legal proceedings and everyday correspondence.
Round out the basics with a working phone number and a professional email address. The name on your correspondence should match the name in state records. Discrepancies invite scrutiny and raise questions about whether the entity is operating properly.
Law Firms
Attorneys face stricter rules than most businesses because professional conduct codes treat stationery as a form of communication about the lawyer’s services. The American Bar Association’s Model Rule 7.5 sets the baseline: a lawyer may not use a firm name, letterhead, or other professional designation that is false or misleading.1American Bar Association. Rule 7.5 Firm Names and Letterheads Most state bars have adopted some version of this rule, with local variations.
Firms with offices in more than one state can use the same firm name everywhere, but the letterhead must flag jurisdictional limitations. If an attorney listed on the stationery isn’t licensed in the state where that office sits, the letterhead needs to say so.1American Bar Association. Rule 7.5 Firm Names and Letterheads Skipping that disclosure can constitute the unauthorized practice of law in the jurisdiction and expose the firm to disciplinary proceedings.
The “Of Counsel” designation gets firms into trouble more often than you’d expect. A lawyer can only be listed as Of Counsel when the relationship with the firm is close, regular, and ongoing. Using the title for a lawyer who occasionally refers cases or shares office space can be treated as a misleading communication under the ethics rules.
Non-lawyer staff can appear on firm letterhead, but their status must be unmistakable. A paralegal, law clerk, or legal assistant needs a clear title next to their name so no one mistakes them for an attorney. Office managers and IT supervisors can be listed if the description accurately reflects their role and clearly signals they are not lawyers.
Financial Services
Broker-dealers registered with FINRA must prominently display the member firm’s name on all retail communications and correspondence. The name shown must match what appears on the firm’s Form BD, though firms commonly recognized by a different name may also use that name alongside it. If the correspondence names other firms or individuals, the relationship between them and the member firm must be spelled out, and it must be clear which entity is offering which product or service.2FINRA. FINRA Rule 2210 Communications with the Public
Investment advisers registered with the SEC don’t face a single letterhead statute, but SEC staff has said that using letterhead identifying yourself as an investment adviser constitutes “holding out” as one. That means the general anti-fraud and disclosure duties under the Investment Advisers Act apply to how you present yourself on your stationery. If your letterhead says “investment adviser” or “financial planner,” everything on it needs to be accurate and not misleading.
Mortgage Loan Originators
Mortgage professionals operate under the SAFE Act, which created the Nationwide Multistate Licensing System. Federal regulations require registered mortgage loan originators to provide their unique NMLS identifier to consumers in their initial written communication, whether on paper or electronic. Many states go further, following the model state law to require the NMLS identifier on all residential mortgage loan applications, solicitations, advertisements, business cards, and websites.3Nationwide Multistate Licensing System. Required Use of NMLS ID
Debt Collectors
Debt collectors face some of the most prescriptive correspondence rules of any industry. The Fair Debt Collection Practices Act requires that the initial written communication with a consumer disclose that the debt collector is attempting to collect a debt and that any information obtained will be used for that purpose. Every subsequent written communication must identify itself as coming from a debt collector.4Office of the Law Revision Counsel. 15 USC 1692e – False or Misleading Representations This is often called the “mini-Miranda” warning, and many collection firms print it directly on their letterhead to ensure it appears on every piece of correspondence.
The first communication, or a follow-up sent within five days, must also include a validation notice containing the amount owed, the name of the creditor the debt is owed to, a statement that the consumer has 30 days to dispute the debt’s validity, a statement that the collector will provide verification if the consumer disputes in writing, and a statement that the consumer can request the name and address of the original creditor if it differs from the current one. Omitting any of these elements is a violation of federal law.5Office of the Law Revision Counsel. 15 USC 1692g – Validation of Debts
Medical and Healthcare Professionals
Healthcare providers work under state medical practice acts that generally require practitioners to accurately represent their credentials. Professional suffixes like M.D. or D.O. communicate the practitioner’s level of training and help patients verify qualifications. Many states go further, requiring the specific medical license number or the name of the professional corporation on official correspondence.
Misrepresenting credentials carries real consequences. Using “Dr.” without specifying the type of doctorate, or implying board certification that doesn’t exist, can constitute the unauthorized practice of medicine or fraudulent misrepresentation depending on the jurisdiction.
Nonprofits and Charitable Organizations
Nonprofits that solicit donations face disclosure rules from both the IRS and state regulators. When a tax-exempt organization provides a written acknowledgment for a donation of $250 or more, that document must include the organization’s name, the contribution date, the amount of any cash gift, and a description of any noncash gift. It must also state whether the organization provided any goods or services in return, and if it did, a good-faith estimate of their value.6Internal Revenue Service. Publication 1771 – Charitable Contributions Substantiation and Disclosure Requirements
A separate rule applies to “quid pro quo” contributions exceeding $75, where the donor receives something in return for the payment. The organization must provide a written disclosure telling the donor that only the amount exceeding the value of the goods or services received is tax-deductible, along with a good-faith estimate of that value.6Internal Revenue Service. Publication 1771 – Charitable Contributions Substantiation and Disclosure Requirements Many nonprofits build these disclosures into their standard letterhead template so they appear automatically on acknowledgment letters.
At the state level, roughly 40 states require nonprofits to register before soliciting donations, and many of those states mandate specific disclosure statements on fundraising materials. The exact language varies, but these disclosures typically include the organization’s registration number and information about where donors can obtain financial records. Failing to include a required state disclosure on a solicitation letter can result in fines or loss of the right to fundraise in that state.
Email Signatures and Digital Correspondence
Digital communications carry their own federal requirement. The CAN-SPAM Act makes it unlawful to send a commercial email that lacks a valid physical postal address of the sender.7Office of the Law Revision Counsel. 15 USC 7704 – Other Protections for Users of Commercial Electronic Mail That address can be a street address, a registered P.O. Box, or a private mailbox registered with a commercial mail receiving agency.8Federal Trade Commission. CAN-SPAM Act: A Compliance Guide for Business A mailing address in the email signature block typically satisfies this requirement.
Every industry-specific rule that applies to paper letterhead applies equally to electronic correspondence. A law firm’s email signature needs the same jurisdictional disclosures as its printed stationery. A debt collector’s email must carry the same mini-Miranda language. A FINRA member’s email must prominently show the firm’s name.
If You Send Correspondence Abroad
Other countries have their own stationery rules, and they can be more prescriptive than U.S. requirements. In the United Kingdom, the Companies (Trading Disclosures) Regulations 2008 require every company to show its registered company number, the part of the UK where the company is registered, and the address of the registered office on its business letters, order forms, and websites.9Legislation.gov.uk. The Companies (Trading Disclosures) Regulations 2008 These rules apply to all limited companies, not just regulated industries. UK companies are not required to list directors on letterhead, but if any single director is named, all of them must be named.10GOV.UK. Running a Limited Company – Signs, Stationery and Promotional Material
Ireland goes further, requiring the names, nationalities (if not Irish), and any former names of all directors on every business letter.11Companies Registration Office. Letterheads If your business corresponds across borders, the safest approach is to include the most comprehensive set of disclosures required by any jurisdiction where you operate.