Demand Letter Lawyer in Ontario: How to Send or Respond to a Legal Demand

A demand letter is often the point where an informal disagreement becomes a formal legal dispute.

A customer has not paid an invoice. A business believes the other side breached a contract. A former contractor is using confidential information. A customer demands a refund. A commercial relationship has broken down. A platform has repeatedly restricted a business despite prior compliance approvals.

In each case, the next written communication can matter.

I’m Raz Toor, the founder of Falcon Law PC. We assist businesses, entrepreneurs and individuals with preparing and responding to demand letters, cease-and-desist correspondence and other pre-litigation legal notices.

The goal is generally not to write the most aggressive letter possible. It is to understand the legal position, organize the evidence, identify the client’s objective and send a communication that improves the client’s position rather than making the dispute worse.

What Is a Demand Letter?

A demand letter is a formal written communication asserting a legal or contractual position and requesting that another party take—or stop taking—specified action.

Depending on the dispute, a demand letter might require the recipient to:

• pay an outstanding invoice;
• repay a loan;
• perform a contractual obligation;
• refund money;
• return property;
• stop using confidential information;
• stop contacting certain customers;
• remove infringing material;
• correct a representation;
• comply with a settlement agreement;
• provide documents;
• stop specified conduct; or
• enter into settlement discussions.

A demand letter may be sent directly by a party or through a lawyer.

Is a Demand Letter the Same as Being Sued?

No.

A demand letter is generally not the same thing as:

• a Statement of Claim;
• a Plaintiff’s Claim;
• a Notice of Application;
• a court order;
• a tribunal proceeding; or
• another formal originating legal document.

Receiving a demand letter does not necessarily mean that a lawsuit has already been started.

But it may indicate that the sender is considering one.

This distinction matters because an actual court or tribunal document can create formal procedural deadlines that should not be treated like a deadline appearing in an ordinary demand letter.

Should You Ignore a Demand Letter?

Usually, no.

That does not mean every demand deserves immediate payment or a lengthy response.

Some demands are weak. Some overstate the law. Some omit important facts. Some demand amounts that are not supported by the contract. Others are strategically drafted and supported by strong evidence.

The correct first step is usually to assess the letter.

Ignoring it without understanding the underlying risk can result in:

• lost settlement opportunities;
• escalation;
• additional legal costs;
• termination of a contract;
• collection activity;
• a lien or other statutory remedy;
• formal proceedings; or
• the other side controlling the written narrative of the dispute.

Do You Have to Respond by the Deadline in the Letter?

Not every deadline written by another lawyer automatically becomes a statutory legal deadline.

A demand letter may say:

“Pay within seven days or legal proceedings will follow.”

That may simply be the deadline selected by the sender.

But you should not assume the deadline is meaningless either.

There may be a separate deadline arising from:

• the underlying contract;
• a cure provision;
• a notice-of-default provision;
• a statutory limitation period;
• construction lien legislation;
• an insurance policy;
• a franchise agreement;
• a lease;
• a shareholder agreement; or
• another legal process.

The deadline should therefore be reviewed in context.

First Step: Read the Demand Carefully

Before responding, identify exactly what the sender is alleging.

I generally break the letter into five questions:

• What facts does the sender allege?
• What contract or legal right do they rely on?
• What amount or remedy are they demanding?
• What evidence do they claim supports the demand?
• What do they say will happen if the demand is refused?

The letter should then be compared against the actual evidence rather than accepted at face value.

Gather the Underlying Documents

For a commercial dispute, I commonly want to review documents such as:

• the signed agreement;
• purchase orders;
• statements of work;
• invoices;
• payment records;
• emails;
• text messages;
• WhatsApp or other business communications;
• amendments;
• refund policies;
• photographs;
• delivery records;
• work logs;
• inspection reports;
• platform correspondence;
• earlier complaints; and
• previous settlement discussions.

A legal response should ideally be based on the documentary record rather than the client’s memory alone.

Preserve the Evidence

Once a serious dispute develops, relevant records should be preserved.

That can include:

• emails;
• text messages;
• contracts;
• invoices;
• photos and videos;
• website content;
• platform messages;
• customer records;
• accounting records;
• internal notes; and
• other information relating to the dispute.

Deleting uncomfortable messages after receiving a legal demand is generally a bad idea.

The fact that a document hurts your position does not mean it should disappear.

Check the Contract Before Responding

Many demand-letter disputes are ultimately contract disputes.

The agreement may contain provisions dealing with:

• payment;
• refunds;
• termination;
• defaults;
• notice requirements;
• cure periods;
• interest;
• late-payment charges;
• indemnities;
• limitations of liability;
• warranties;
• dispute resolution;
• mediation;
• arbitration;
• governing law; and
• jurisdiction.

Before saying that the other side has breached the agreement, the agreement itself should be reviewed carefully.

Do Not Accidentally Admit Liability

A quick emotional response can create problems.

Examples include writing:

“I know we owe you the money, but we can’t pay right now.”

or:

“Yes, we breached the agreement, but you caused the problem first.”

Those statements may have legal consequences.

That does not mean every response should deny everything.

Sometimes acknowledging an undisputed portion of a problem is commercially sensible.

But admissions should be intentional rather than made impulsively before the legal and factual position is understood.

Do Not Overreact Either

The opposite mistake is responding to a $10,000 payment dispute with an eight-page letter accusing the other side of fraud, bad faith, conspiracy and criminal conduct.

More aggressive does not necessarily mean more persuasive.

A response should ordinarily focus on the actual issues.

That may mean:

• correcting factual inaccuracies;
• identifying relevant contractual provisions;
• denying unsupported allegations;
• providing missing documents;
• requesting substantiation;
• making a counter-demand;
• proposing practical resolution terms; or
• reserving the client’s legal rights.

Should Your Response Be “Without Prejudice”?

Not necessarily.

Businesses often assume that adding the words “WITHOUT PREJUDICE” to the top of any letter prevents the letter from ever being used.

That is an oversimplification.

Settlement privilege generally relates to genuine communications made for the purpose of resolving a dispute.

A purely factual or legal response may need to remain an open communication.

In some situations, it can make sense to send:

• an open response dealing with the factual and legal allegations; and
• a separate settlement communication dealing with compromise.

The appropriate approach depends on the dispute.

Common Type 1: Unpaid Invoice or Debt Demand

A demand letter is commonly used where a customer has not paid for goods or services.

Before sending one, confirm:

• who the correct debtor is;
• whether the contract was with an individual or corporation;
• what work was actually performed;
• the amount invoiced;
• payments already received;
• the contractual payment date;
• whether interest or late charges apply;
• whether the debtor disputed the work;
• whether credits are outstanding; and
• whether there are guarantees or other security.

A strong payment demand should generally make it easy to understand exactly how the amount was calculated.

Should You Demand More Than the Invoice?

Be careful.

A business may want to add:

• interest;
• late charges;
• administrative fees;
• collection fees;
• legal costs; or
• other amounts.

Whether those amounts are recoverable depends on the contract and applicable law.

A demand letter should not inflate a claim simply to make it sound more serious.

Common Type 2: Breach of Contract

A contractual demand may allege that another party has:

• failed to perform services;
• missed a contractual deadline;
• delivered defective work;
• failed to make payment;
• violated exclusivity obligations;
• failed to meet a minimum commitment;
• misused intellectual property;
• breached confidentiality;
• improperly terminated an agreement; or
• otherwise failed to perform contractual obligations.

A useful demand should normally identify the specific contractual obligations relied upon rather than simply stating that the other side acted “illegally.”

Check Whether the Contract Gives a Right to Cure

Many agreements require notice before termination or escalation.

For example, the agreement may require:

• written notice of a breach;
• delivery to a specific email or address;
• a 10-, 15- or 30-day cure period;
• escalation to senior representatives;
• mediation before proceedings; or
• arbitration rather than court proceedings.

A demand letter should be coordinated with those provisions.

Sending the wrong type of notice, to the wrong person or through the wrong delivery method can create avoidable complications.

Common Type 3: Customer Refund or Rescission Demands

Businesses also receive demands from customers seeking:

• full refunds;
• partial refunds;
• cancellation of contracts;
• rescission;
• chargeback reimbursement;
• compensation for alleged defects; or
• additional damages.

Before responding, the business should review:

• the signed agreement;
• refund or cancellation terms;
• consumer representations made before the sale;
• invoices;
• messages with the customer;
• what services or goods were actually delivered;
• any alleged defects;
• any attempted remediation; and
• consumer-protection legislation that may apply.

A contractual “no refunds” clause should not simply be treated as a complete answer to every possible consumer-law issue.

Common Type 4: Cease-and-Desist Letters

A cease-and-desist letter usually seeks to stop conduct rather than simply obtain payment.

Examples can include alleged:

• misuse of confidential information;
• trademark or brand misuse;
• copyright infringement;
• customer solicitation;
• breach of restrictive covenants;
• misuse of company property;
• false representations;
• continued unwanted business communications; or
• other contractual misconduct.

The sender should identify precisely what conduct must stop.

An overbroad letter demanding that a person “never compete with us again” can be considerably less useful than a focused demand tied to actual legal rights.

What if You Receive a Cease-and-Desist Letter?

Do not assume that the fact a lawyer sent the letter means every allegation is legally correct.

Review:

• what right the sender claims;
• the contract relied upon;
• the scope of any restrictive covenant;
• the intellectual-property rights involved;
• what conduct supposedly occurred;
• what evidence exists;
• what the sender is demanding; and
• whether any immediate operational change is prudent.

Common Type 5: Construction Payment Demands

Construction disputes frequently involve demand correspondence concerning:

• unpaid invoices;
• holdbacks;
• change orders;
• scope disputes;
• deficiencies;
• delays;
• back-charges;
• termination; and
• construction liens.

A demand letter should not be used as a substitute for monitoring statutory lien deadlines.

Ontario’s Construction Act contains specific periods for preserving construction liens. In many cases, the preservation period is 60 days from the applicable triggering event.

Negotiating over an invoice or sending repeated demands does not mean that the parties can safely ignore those statutory timelines.

For lien-specific matters, see our Ontario Construction Lien legal services.

Common Type 6: Platform and Online Business Disputes

Demand letters are not limited to traditional debtor-creditor disputes.

Online businesses may encounter disputes involving:

• marketplace suspensions;
• seller-account restrictions;
• repeated compliance reviews;
• payment holds;
• account access;
• intellectual-property complaints;
• content takedowns;
• service-provider disputes;
• platform contractual rights; and
• business interruption caused by automated or repeated review processes.

These demands often require a different strategy from a conventional debt letter.

The objective may be to put the factual history into a concise legal record, identify prior approvals, assemble supporting documentation and escalate the matter to the appropriate legal or compliance team.

What Should a Good Demand Letter Include?

The content depends on the dispute, but a well-prepared demand commonly includes:

• identification of the parties;
• a concise factual chronology;
• the relevant agreement or legal relationship;
• the alleged breach or issue;
• the amount claimed, where applicable;
• important supporting documents;
• the remedy being requested;
• a reasonable response deadline;
• the consequences of non-compliance where appropriate; and
• reservation of applicable legal rights.

The factual chronology is often the most important part.

What Should Not Go Into a Demand Letter?

I would generally be cautious about including:

• irrelevant personal attacks;
• unsupported accusations of fraud or criminal activity;
• threats that the client does not intend or cannot lawfully carry out;
• exaggerated damages;
• confidential information that does not need to be disclosed;
• inaccurate legal conclusions;
• unnecessary admissions;
• emotional language; and
• every argument the client might possibly make.

A demand letter is not necessarily stronger because it is longer.

Should You Threaten a Lawsuit?

Only where that statement is appropriate.

If litigation is genuinely one of the client’s options, a letter may state that further legal remedies are being considered or reserved.

But a demand letter should not promise that proceedings will definitely be commenced by a certain date unless the client is actually prepared to take that step.

Sometimes the better strategy is to preserve legal rights while leaving room for a commercial resolution.

What if You Do Not Want Litigation?

That is common.

Many businesses want the dispute resolved precisely because litigation would consume too much time and money.

A demand letter can still be useful.

The objective may be:

• payment;
• a payment plan;
• a refund;
• a partial refund;
• contractual compliance;
• a clean termination;
• return of property;
• a mutual release;
• a commercial compromise; or
• a negotiated settlement.

The letter can be drafted to create leverage without assuming that court is the desired outcome.

Settlement Should Be Documented Properly

If the demand results in a settlement, the parties should consider documenting the resolution.

Depending on the dispute, the settlement may deal with:

• payment amount;
• payment schedule;
• releases;
• confidentiality;
• non-disparagement;
• return of property;
• future communications;
• tax treatment;
• default remedies;
• security for deferred payments; and
• termination of the underlying agreement.

An email saying “fine, we’ll settle for $20,000” can leave many questions unanswered.

Demand Letters and Limitation Periods

Sending a demand letter does not mean that a claimant can stop monitoring limitation periods.

Ontario’s Limitations Act, 2002 provides a basic limitation period of two years from discovery of a claim, subject to important exceptions and special rules.

The date the claim was “discovered” can itself become a legal issue.

Different statutes and causes of action can also have different timelines.

Accordingly, do not assume that:

• sending a demand letter;
• receiving a response;
• negotiating informally; or
• waiting for the other side to respond

automatically preserves every legal right indefinitely.

Should You Notify Your Insurer?

Possibly.

A demand may involve a claim potentially covered by:

• commercial general liability insurance;
• professional liability insurance;
• errors and omissions insurance;
• cyber insurance;
• directors and officers insurance;
• employment practices coverage; or
• another specialized policy.

Some policies require notice of actual or potential claims within particular periods.

A business should not settle, admit liability or ignore an insurer-notification requirement without reviewing the policy where insurance coverage may be relevant.

Should Employees Respond Directly?

Once a dispute becomes serious, it can be useful to centralize communications.

Otherwise:

• one employee may admit something;
• another may deny it;
• a third person may offer a refund;
• accounting may continue sending ordinary collection emails; and
• management may simultaneously threaten legal action.

Those inconsistent communications can complicate the file.

In appropriate cases, the lawyer’s response can state that substantive communications about the dispute should be directed through counsel.

What We Have Been Working On in 2026

Our recent demand-letter work has involved disputes well beyond ordinary unpaid invoices.

In one 2026 matter, we were instructed to prepare formal legal correspondence for businesses selling regulated products through a major online marketplace.

More than 20 product listings had repeatedly been placed into compliance review even though the sellers had previously submitted the requested regulatory documentation and obtained approvals.

The work required reviewing the history of restrictions, prior approvals, repeated document requests and supporting evidence so that the demand could present a coherent record to the platform’s legal and compliance teams.

That matter is a useful example of a demand letter being used for commercial escalation rather than simply threatening a lawsuit.

In another 2026 matter, we were asked to assist a business after a customer sent a formal notice seeking rescission and a refund.

The business disputed the customer’s allegations and wanted a formal response. Our preliminary work involved reviewing the signed documentation and invoice, assessing the allegations, identifying the information that should be substantiated and considering whether further substantive communications should be directed through counsel.

That matter illustrates the other side of demand-letter practice: sometimes the important legal work is not sending a demand—it is responding to one without making unnecessary admissions or allowing the dispute to spiral through informal communications.

The examples above have been anonymized and certain details have been generalized to protect client confidentiality.

How to Respond to a Demand Letter: Practical Checklist

If you receive a legal demand, I would generally work through the following:

• Confirm when the letter was received.
• Determine whether it is only a demand letter or an actual court or tribunal document.
• Identify every response deadline.
• Review the underlying contract.
• Check contractual notice and cure provisions.
• Preserve the relevant documents and communications.
• Prepare a factual chronology.
• Identify disputed and undisputed facts.
• Confirm the amount actually in dispute.
• Check whether insurance may apply.
• Review statutory deadlines.
• Determine whether employees should stop communicating directly.
• Identify the business objective.
• Decide whether the response should deny, negotiate, request information or counter-demand.
• Consider whether a separate settlement proposal is appropriate.
• Do not destroy records.
• Do not make unnecessary admissions.

Before Sending a Demand Letter: Practical Checklist

If you are the party considering sending one, I would generally confirm:

• Who is the correct legal party?
• Do you have the correct corporate name?
• What agreement governs the relationship?
• What exactly was breached?
• What evidence proves the breach?
• What loss have you actually suffered?
• What amount is owing?
• What remedy do you actually want?
• Are there notice requirements?
• Is there a mandatory cure period?
• Does the agreement require mediation or arbitration?
• Is there a statutory deadline?
• Have you preserved construction lien rights where relevant?
• Are interest and legal costs contractually recoverable?
• Would a practical settlement be preferable?
• What will you actually do if the demand is rejected?

Common Demand Letter Mistakes

Some common problems include:

• sending the letter before reviewing the contract;
• sending it to the wrong legal entity;
• making unsupported legal allegations;
• demanding inflated damages;
• using emotional or insulting language;
• threatening proceedings the sender has no intention of pursuing;
• ignoring contractual notice provisions;
• ignoring limitation periods;
• missing construction lien deadlines while negotiating;
• assuming “without prejudice” automatically protects every communication;
• making unnecessary admissions in a response;
• allowing multiple employees to communicate inconsistently;
• failing to preserve evidence;
• ignoring possible insurance coverage;
• refusing a reasonable commercial solution simply because the dispute has become personal; and
• treating a demand letter as though it is already a court order.

When Is a Lawyer’s Demand Letter Worth It?

Using a lawyer can make sense where:

• the amount is significant;
• the contract is complicated;
• the other side already has counsel;
• the dispute could materially affect the business;
• there are personal guarantees;
• confidential information is involved;
• intellectual property is involved;
• construction lien rights may exist;
• the allegations are serious;
• the relationship is ongoing and needs to be preserved;
• the dispute involves a large platform or institution;
• a settlement needs to be documented; or
• you want an objective assessment before escalating the dispute.

What Can Falcon Law PC Help With?

Falcon Law PC’s demand-letter work is generally focused on the pre-litigation and commercial-resolution stage.

We can assist with matters such as:

• unpaid invoice demands;
• business debt demands;
• contractual default notices;
• breach-of-contract demands;
• responses to customer refund or rescission demands;
• cease-and-desist correspondence;
• confidentiality disputes;
• commercial platform disputes;
• construction payment correspondence;
• settlement correspondence;
• responses to lawyer demand letters;
• document review and risk assessment; and
• pre-litigation settlement documentation.

You can learn more about our legal services for entrepreneurs and business owners.

If you already know that you need a demand letter and want to get the process started, you can also QuickStart a Demand Letter.

If the dispute reaches the stage where a formal court proceeding is required, litigation strategy and representation may need to be addressed separately.

What Should You Send the Lawyer?

To review a demand-letter matter efficiently, I generally recommend sending:

• the demand letter received, if applicable;
• the signed contract;
• relevant amendments;
• invoices;
• payment history;
• a short chronology;
• the most important emails or messages;
• relevant photographs or reports;
• prior attempts to resolve the issue; and
• a clear explanation of the outcome you want.

The objective is to identify the real dispute quickly rather than spending legal time reconstructing months of communications from an unorganized email chain.

Final Point: A Demand Letter Is a Tool, Not the Goal

The point of a demand letter is not simply to send something intimidating on a lawyer’s letterhead.

A useful demand should move the dispute toward an objective.

Sometimes that objective is full payment.

Sometimes it is a negotiated payment plan, contractual compliance, an orderly termination, a refund, removal of content, return of property, a settlement or simply a clear written record of the client’s position.

The best approach depends on the contract, the evidence, the amount at stake, the relationship between the parties and what the client is actually trying to achieve.

This article is intended for general informational purposes only and does not constitute legal advice. Demand letters, contractual notices, statutory deadlines and limitation periods are fact-specific. If you have received formal court or tribunal documents, different procedural deadlines may apply and legal advice should be obtained promptly.