The letter that states a claim and asks for payment or action before a lawsuit: when one is legally required, what it should say, how settlement communications are protected, and what not to put in it.
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A demand letter sets out a claim - what happened, why the other side is responsible, what loss resulted - and asks for a specific remedy, usually payment or an action, by a stated date before the sender files suit. Most claims do not legally require one, but it often leads to settlement, shows a court that the sender tried to resolve the dispute, and starts the clock on interest or fees under some contracts and statutes. Many people write their own before a small claims case, and some small claims courts expect it.
Some claims do require written notice before suit. Several state consumer protection statutes require a demand describing the unfair practice and the injury, with a waiting period, before a consumer can sue; claims against a government usually require a formal notice of claim within a short deadline (see suing the government); some states require pre-suit notice in medical malpractice cases; and a buyer of goods must notify the seller of a breach within a reasonable time after discovering it or lose the remedy. Missing a required notice can bar the claim.
A good letter is factual and specific: dates, amounts, copies (not originals) of the key documents, the remedy wanted and the deadline. Offers to compromise made in negotiations are generally not admissible to prove that the claim is valid or what it is worth, which lets parties negotiate frankly, but the letter can still be used for other purposes. Do not threaten criminal charges or a report to authorities to gain an advantage in a civil dispute; that can be extortion under state law and, in many states, a violation of the ethics rules for lawyers. A business or person that receives a demand letter should not ignore it, should preserve relevant documents, and should notify its insurer promptly if the claim might be covered (see duty to defend).
For a modest claim you can write the letter yourself. A letter from a lawyer is worth paying for when the claim is large, when a statute requires a particular form of notice, when the other side is a business that ignores individuals, or when you want to preserve rights to attorney's fees or extra damages that depend on a proper demand. If you received a demand letter, a lawyer can tell you whether the claim has merit, whether insurance covers it, and how to respond without making admissions.
Worried about the cost? A lawyer can be hired for one part of a case only (limited-scope representation), may be paid from what a claim recovers (contingency fee), or may be free through a pro bono program or legal aid; a court can also waive its own filing fees.
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