In law, a demand is a formal written notice in which one party asserts a legal right and requires another party to take a specific action, usually payment, by a stated deadline. That definition matters because a demand does more than express displeasure. It puts the recipient on notice, starts the clock on their default, and in many situations it is a step the law requires before a lawsuit can even be filed.
Why a Demand Carries Legal Weight
A demand converts a general grievance into something with legal consequences. Once it is delivered, the recipient is considered on notice of the claim, and their failure to respond or perform starts the clock on their default. Default at this stage does not mean the sender has won anything. It means the other side has been told exactly what they owe and when, and their inaction can be used against them later in court.
Courts treat pre-demand and post-demand behavior differently. Before a demand, a debtor can argue they did not realize payment was overdue or did not understand what was expected. After a documented demand, that argument disappears. The demand also freezes the facts: it states a specific amount, references specific obligations, and locks in a timeline that binds both parties. Judges pay attention to whether a party ignored a clear demand, and that silence often strengthens the sender’s position when the court is asked to award damages or interest.
Liquidated and Unliquidated Demands
Demands come in two forms, and the difference shapes how quickly they resolve.
A liquidated demand involves a fixed, easily calculable amount: an unpaid invoice for $5,000, a security deposit of $1,200 a landlord refuses to return, rent that is three months overdue. The number is not open to argument because both parties already agreed to it through a contract, receipt, or other documentation. Courts handle these efficiently because there is nothing to calculate.
An unliquidated demand involves an amount that has not been determined yet. Pain and suffering after an accident, future lost income from an injury, or the diminished value of damaged property all require evidence, expert testimony, or judicial calculation before anyone can attach a dollar figure. The demand still has to state a specific number, but that figure represents the sender’s position rather than an undisputed sum. These claims take longer because the parties almost always disagree about what the damages are worth.
When the Law Requires a Demand Before You Can Sue
Skipping a required demand is one of the fastest ways to get a case thrown out. Several areas of law treat the demand as a jurisdictional prerequisite: a judge will not hear the case until the notice process has been followed, no matter how strong the underlying claim is.
Adequate Assurance Under the UCC
The Uniform Commercial Code gives either party in a sale-of-goods contract the right to demand adequate assurance of performance when reasonable grounds for insecurity arise. The demand must be in writing, and the requesting party can suspend their own performance while waiting for a response.1Legal Information Institute. U.C.C. 2-609 – Right to Adequate Assurance of Performance If the other side fails to provide adequate assurance within 30 days, that silence is treated as a repudiation of the contract, giving the demanding party the right to cancel and sue for breach. It is one of the clearest examples in American law where silence after a demand has automatic legal consequences.
Claims Against the Federal Government
You cannot sue the federal government for negligence or property damage without first filing an administrative claim with the responsible agency. Under the Federal Tort Claims Act, the claim must be presented in writing, must include a specific dollar amount (called a sum certain), and the agency has six months to respond. If the agency denies the claim or does not respond within that window, the silence can be treated as a denial and suit can be filed.2Office of the Law Revision Counsel. 28 USC 2675 – Disposition by Federal Agency as Prerequisite The deadline for filing the initial administrative claim is two years from the date of injury. Missing it forfeits the right to sue.
State and local government claims follow separate rules that vary widely. Many require a formal notice of claim within much shorter windows, sometimes as brief as 90 days from the incident, and those deadlines are notoriously unforgiving.
Shareholder Derivative Actions
A shareholder who wants to sue on behalf of a corporation must first make a written demand on the company’s board of directors, asking them to take the desired action. The federal rules require the complaint to describe this demand effort in detail and explain why the board did not act.3Legal Information Institute. Federal Rules of Civil Procedure Rule 23.1 – Derivative Actions The board manages the corporation, so it should have the first opportunity to address the problem internally. Filing a derivative suit without making the demand, or without explaining why the demand would have been futile, typically results in dismissal.
Employment Discrimination
Workplace discrimination claims under Title VII and the Americans with Disabilities Act require an administrative step before a federal lawsuit is possible. You must first file a charge with the Equal Employment Opportunity Commission and wait for a Notice of Right to Sue. The EEOC generally needs 180 days to resolve the charge before issuing that notice. Age discrimination claims under the ADEA follow a different path: suit can be filed 60 days after submitting the charge without waiting for the notice.4U.S. Equal Employment Opportunity Commission. After You Have Filed a Charge
What a Valid Demand Has to Contain
A demand is not a court filing, and no judge reviews it before it goes out. But the quality of the demand matters enormously if the dispute later reaches court. Opposing counsel and judges will scrutinize it for specificity, reasonableness, and whether it gave the other side a genuine opportunity to comply.
Every demand should identify the legal basis for the claim. Reference the specific contract, invoice number, lease agreement, or incident that created the obligation. Vague demands that say “you owe me money” without tying the claim to a documented transaction are easy to ignore and hard to enforce. State the exact dollar amount, broken down into principal, any contractual late fees, and accrued interest if the agreement provides for it.
Set a concrete deadline. “Within 15 business days of receipt” works. “As soon as possible” does not. Courts consider whether the deadline was reasonable in context. A demand for $500 with a three-day deadline looks aggressive; the same amount with a 30-day window looks measured. The deadline also determines when the sender can characterize inaction as a refusal and move on to litigation.
Interest and the Statute of Limitations
Timing affects interest. Many contracts include provisions for interest on overdue amounts, and the demand often establishes the date from which interest starts running. Pre-judgment interest rates vary significantly by jurisdiction, typically running from about 2% to 18% annually depending on the type of claim and the governing law. At the federal level, post-judgment interest on money judgments is calculated using the weekly average one-year Treasury yield, which has hovered around 3.5% through early 2026.5Office of the Law Revision Counsel. 28 USC 1961 – Interest A demand should reference the applicable interest rate and show how the figure was calculated so the recipient understands the full cost of continued delay.
A demand is worthless if the underlying claim has already expired. Every type of legal claim has a deadline for filing suit, and that deadline keeps running regardless of whether a demand has been sent. Written contract claims commonly carry a four-year statute of limitations; oral contract claims often have a two-year window, though these periods vary by jurisdiction. Sending a demand does not pause or extend the statute of limitations. If the filing deadline is approaching, get the demand out quickly or file suit first and negotiate afterward.
How to Deliver a Demand
Delivery method determines whether receipt can be proved. Certified mail with return receipt requested is the standard approach because the signed receipt creates a physical record of delivery. That receipt becomes evidence in court that the recipient was on notice as of a specific date.
Personal delivery through a process server is another reliable option, particularly for high-value claims or situations where the recipient is likely to deny getting the letter. The affidavit of service the process server provides is strong evidence of delivery.
Electronic delivery is legally valid in some circumstances, but the requirements are stricter than most people realize. Under the federal E-SIGN Act, using electronic communication for legal notices requires that the recipient previously gave affirmative consent to receive records electronically, and that consent must meet specific disclosure requirements.6National Credit Union Administration. Electronic Signatures in Global and National Commerce Act (E-Sign Act) If the original contract between the parties permits email for legal notices, that generally holds up. Otherwise, treat email as a supplement to certified mail rather than a replacement.
What the Response, or Silence, Means
Three things typically happen after the deadline. The best outcome is full compliance: payment, return of property, or performance of the required action, which ends the dispute without court involvement. A partial offer or counteroffer is also common and forces a practical decision about whether the discount is worth avoiding litigation costs and delays.
Complete silence is the most frustrating response but also the most legally useful. Once the deadline has expired without any response, a complaint can be filed in civil court. The demand letter, proof of delivery, and the recipient’s failure to respond all become part of the case file and show the judge that a good-faith effort was made to resolve the dispute before asking the court to intervene. Some consumer protection and contract statutes also make a pre-suit demand a prerequisite to recovering attorney fees, so the letter can directly affect how much a successful plaintiff is entitled to collect.