A letter of intent to sue — also called a demand letter — tells the other side in writing that you plan to file a lawsuit unless they resolve your claim by a specific date. To write one well, you need to identify the parties, lay out the facts in order, explain why the recipient is legally responsible, state a specific dollar amount backed by documentation, and give a clear response deadline. Done right, the letter often ends the dispute without a lawsuit. Done poorly, it can weaken your case before you ever get to court.
Every word in the letter can show up later in a courtroom, so the writing matters. Here is what belongs in the letter, what to keep out, and how to send it so it actually counts.
What the Letter Needs to Contain
A demand letter has to do three things: tell the recipient exactly what happened, explain why they are legally responsible, and state precisely what you want. Vague letters get ignored. Specific ones get taken seriously.
The Parties and the Facts
Open with full names and contact information for both sides. Then lay out the facts in chronological order: what happened, when, where, and how the other party’s actions caused you harm. Be specific with dates. “You rear-ended my car at the intersection of Main and Elm on March 12, 2025” is far more effective than “you damaged my vehicle.” Attach copies of relevant documents — contracts, invoices, photographs, correspondence — as exhibits. The goal is to make it impossible for the recipient to claim they do not understand what you are talking about.
The Legal Basis
You do not need to write a legal brief, but you do need to identify why the other party is liable. Common theories include breach of contract, negligence, fraud, and violation of a consumer protection statute. If you cannot name the theory that fits your situation, that is a sign you should talk to a lawyer before sending anything. A demand built on the wrong legal theory undermines your credibility.
A Specific Dollar Amount, Broken Down
The weakest part of most demand letters is the damages section. Writing “I want $50,000” with no explanation invites the recipient to throw the letter in the trash. Break the number into categories and support each one.
Economic losses are the straightforward ones: medical bills, repair costs, lost wages, out-of-pocket expenses. Add them up using receipts, invoices, pay stubs, and estimates. If you expect future costs, such as ongoing medical treatment or additional lost income, include those projections with supporting documentation from a doctor or employer.
Non-economic losses — pain, emotional distress, diminished quality of life — are harder to quantify because there is no receipt to attach. Acknowledge that in the letter, but still assign a dollar figure and explain your reasoning. Medical records, therapist notes, and specific descriptions of how the injury affected your daily life all support these claims. Your total demand should be the sum of your categories, not a number you picked because it sounded intimidating.
A Response Deadline
Give the recipient a specific date to respond, typically 14 to 30 days from when they receive the letter. State clearly that you intend to file a lawsuit if you do not receive a satisfactory response by that date. Too short and you look unreasonable. Too long and you lose urgency.
What to Leave Out
Federal evidence rules generally prevent settlement offers and negotiation statements from being used to prove liability at trial.1Office of the Law Revision Counsel. Federal Rules of Evidence Rule 408 – Compromise and Offers to Compromise That protection has limits, though, and factual admissions you make in writing may still be fair game. A few things do not belong in the letter:
- No threats beyond litigation. You can say you will file suit. You cannot threaten to report someone to the police, expose embarrassing information, or contact their employer unless they pay you. That crosses the line from demand letter to potential extortion, regardless of whether the underlying claim is legitimate.
- No admissions of fault. If you were partially responsible for what happened, do not volunteer it. Anything you concede in writing can be used against you.
- No emotional language. Insults, attacks on character, and dramatic phrasing make you look unreasonable. Judges and opposing counsel will read this letter. Write for that audience.
- No inflated or fabricated claims. Demanding ten times your actual damages or inventing injuries you do not have destroys your credibility. A jury that sees an absurd demand letter will question everything else you say.
Format and Tone
The letter should look like a professional business document. Put your name, address, and the date at the top, followed by the recipient’s name and address. Add a subject line that says something like “Notice of Intent to Sue” or “Demand for Payment” so there is no ambiguity about what the recipient is holding.
Write in a calm, factual tone. The most effective demand letters read like someone stating obvious facts and drawing obvious conclusions. They do not beg, plead, or threaten. Use plain language. If you find yourself writing “heretofore” or “notwithstanding,” start the sentence over.
Keep it focused. Two to four pages is typical. If the letter is running long, you are probably including unnecessary background or repeating yourself. Attach documents as exhibits rather than describing every detail in the body.
How to Send It
Your delivery method needs to prove the recipient actually received the letter. Certified mail with a return receipt is the standard approach: you get a signed card back confirming delivery, and that card becomes part of your file.
A professional process server is another option, particularly for higher-stakes disputes. The server delivers the letter in person and provides a sworn statement confirming delivery. Fees typically run from $20 to $200 depending on location. Email with a read receipt can supplement your main delivery, but many jurisdictions do not consider it sufficient proof on its own. Send by certified mail and follow up by email if you want.
Keep copies of everything — the letter, the certified mail receipt, the return receipt card, any tracking information. If you end up filing suit months later, you will need them.
Watch the Statute of Limitations While You Negotiate
Every civil claim has a filing deadline called a statute of limitations, and once it passes, you lose the right to sue no matter how strong your case is. Common ranges include two years for personal injury, two to four years for breach of contract, and three years for property damage. Some are shorter.
Here is where people get into trouble. They send a demand letter, wait for a response, trade offers for weeks, and then realize the filing deadline passed during negotiations. A demand letter does not pause the statute of limitations. The clock keeps running.
If your deadline is approaching, either file the lawsuit first and keep negotiating afterward, or ask the other side to sign a tolling agreement. A tolling agreement is a written deal in which both parties agree not to count the negotiation period against the statute of limitations. It creates space for real settlement talks without an imminent filing deadline pressuring you into a bad outcome.
When Written Notice Is Legally Required
For most civil disputes, a demand letter is strategic rather than mandatory. Several categories of claims, though, require formal written notice before a court will hear the case, and skipping that step can get your lawsuit thrown out.
- Claims against the federal government. Under the Federal Tort Claims Act, you cannot sue the United States for negligence by a federal employee until you first file a written claim with the responsible agency and that agency either denies it or fails to act within six months. The administrative claim must be filed within two years of the incident, and any lawsuit must be filed within six months of the agency’s written denial.2Office of the Law Revision Counsel. 28 USC 2675 – Disposition by Federal Agency as Prerequisite3Office of the Law Revision Counsel. 28 USC 2401 – Time for Commencing Action Against United States
- Employment discrimination claims under Title VII and the ADA. Before suing an employer for discrimination based on race, sex, religion, national origin, or disability, you must file a charge with the EEOC and receive a Notice of Right to Sue. The EEOC generally requires 180 days to investigate before issuing that notice.4U.S. Equal Employment Opportunity Commission. What You Can Expect After You File a Charge
- Claims against state and local governments. Nearly every state has a tort claims act requiring written notice to the government agency before you can sue, often within 60 to 180 days of the incident. These deadlines are strict and missing them usually kills the claim permanently.
- Medical malpractice. Many states require a notice of intent sent to the healthcare provider weeks or months before filing, sometimes with an expert affidavit attached.
- Small claims court. A number of jurisdictions require a written demand before you can file. Even where it is not mandatory, judges look favorably on plaintiffs who tried to resolve the dispute first.
If your claim falls into one of these categories, the letter is a legal prerequisite, and the format, content, and timing may need to follow specific rules. Check the requirements for your claim type before you write anything.
What to Expect After the Letter Goes Out
Once the letter is delivered, you wait. The recipient will typically do one of four things: offer a settlement, deny the claim, ask for more time or information, or ignore you.
Most disputes that end with a demand letter end with a settlement offer below your demand, followed by counteroffers until both sides reach a number they can live with. Get any agreement in writing and signed before money changes hands. If the deal involves more than a payment — returning property, correcting a public statement, modifying a contract — spell out every term.
A denial, or silence after your deadline passes, means it is time to decide whether to actually file. Confirm your statute of limitations has not run and that you have satisfied any pre-suit notice requirements before filing a complaint. If both sides want to keep talking but the deadline is close, use a tolling agreement rather than letting the clock run out.
When to Bring in a Lawyer
Not every demand letter needs an attorney. For a straightforward dispute, a modest dollar amount, and a writer who can be clear and specific, a well-crafted letter on your own can resolve the matter. Many small claims and minor contract disputes end that way.
Some situations call for professional help. If your claim requires a mandatory pre-suit notice with specific legal requirements, if the amount at stake is significant, if the other side has a lawyer, or if you are not sure which legal theory applies, a consultation is almost certainly worth the cost. Many attorneys will draft or review a demand letter for a flat fee without requiring you to retain them for the entire case.
A letter from a law firm also carries more weight than one from a private individual. It signals that you have invested money in the dispute, that a professional evaluated your claim and found it worth pursuing, and that someone is ready to file the complaint if negotiations fail. For larger claims, that signal alone can bring the other side to the table.