Unpaid Invoices in Ontario: How to Recover Money You're Owed

An unpaid invoice can stem from several very different situations, and identifying which one you’re dealing with shapes the right response. Sometimes it’s a genuine oversight — a busy client who simply forgot, or an invoice that got lost in a shared inbox. Sometimes it’s a cash-flow problem on the other side, where the client intends to pay but can’t right now. And sometimes it reflects a dispute about the quality or completeness of the work, even if that dispute was never clearly raised with you.

A quick, low-key check-in can often clarify which situation you’re in before you escalate further. If the client responds promptly with an apology and a payment date, you’re likely dealing with an oversight or a temporary cash-flow issue. If they respond defensively or raise concerns about the work for the first time, you may be dealing with an underlying dispute that needs to be addressed on its own terms before payment will follow.

It’s also worth checking your own records before assuming the client is simply avoiding payment. Confirm the invoice was actually sent to the correct contact and address, that it clearly stated the amount and due date, and that it referenced the agreement or purchase order the client would recognize. A surprising number of “unpaid” invoices turn out to have never been properly received in the first place.

Whatever the underlying cause, resist the urge to immediately assume bad faith. Most overdue invoices are eventually paid once the situation is addressed directly and clearly. Approaching the conversation with a professional, problem-solving tone — rather than frustration — tends to get results faster and preserves the option of continuing to work together if that’s something you’d otherwise want.

Most recoveries should start with a brief, professional reminder — an email or a phone call referencing the specific invoice number, amount, and due date. This costs nothing, preserves the relationship, and resolves a large share of late payments on its own, since many are the result of an honest oversight rather than any unwillingness to pay.

Keep a written record of this reminder and any response, even if the conversation happens by phone — a quick follow-up email summarizing what was discussed (“confirming our call today, you mentioned payment would go out by Friday”) creates a useful record without feeling adversarial, and it becomes valuable if the situation later needs to escalate.

Timing matters here too. Sending a reminder promptly after an invoice becomes overdue — rather than letting weeks pass out of politeness or discomfort — signals that you’re actively tracking payment without needing to be unpleasant about it. Clients who understand that overdue invoices will be followed up on consistently tend to prioritize paying you sooner, simply because the friction of ignoring the request doesn’t pay off.

Choosing the right channel for the reminder also matters. A quick phone call can resolve many situations faster than an email that might sit unread, while an email creates a clearer written record. Using both — a call to flag the issue, followed by a short email confirming the details — often gets the benefits of each without much extra effort.

If a reminder doesn’t produce payment or a clear commitment within a reasonable time, the next step is a formal, written demand letter. This is a more serious communication than a reminder — it identifies the amount owed, references the relevant invoice and agreement, and sets a specific deadline for payment, along with a brief, professional note about what happens if the deadline passes without resolution.

Our detailed guide on writing an effective demand letter covers exactly what to include and how to structure it. For an unpaid invoice specifically, it’s worth attaching a copy of the original invoice and any supporting documentation showing the work was completed or goods were delivered as agreed.

Deciding who sends the demand letter also matters. For a straightforward, well-documented invoice, sending it yourself is usually sufficient. For a larger amount or a client who has been unresponsive, having a lawyer send the letter can add weight without necessarily committing you to full litigation if the letter succeeds on its own.

If the demand letter produces a response but not immediate full payment, consider whether a structured payment plan makes sense — particularly for an otherwise reliable client facing a genuine, temporary cash-flow problem. A written payment plan, with clear instalment amounts and dates, and a clear statement of what happens if a payment is missed, can resolve the matter while preserving a relationship worth keeping.

If there’s no response at all, or the response doesn’t lead anywhere productive, your realistic options generally narrow to a collection agency or a court claim. Which makes more sense depends heavily on the amount owed, the strength of your documentation, and how much time and effort you’re willing to invest in recovering it.

It’s worth doing a quick, honest cost-benefit check before committing to either path. Court filing fees, time away from your business, and the (often overlooked) risk of not fully recovering the amount even after winning are all real costs. For a small amount, a collection agency’s percentage fee may end up being the more efficient choice, even though it means recovering less than the full amount owed.

For amounts within its monetary limit, Ontario’s Small Claims Court is designed to be a more accessible venue than the Superior Court of Justice — with simpler procedures and lower costs, intended to let people navigate a claim without necessarily needing a lawyer, though you’re free to have one if you prefer.

A Small Claims Court claim generally requires filing a claim describing what’s owed and why, having it served on the debtor, and proceeding through a settlement conference before any trial, which gives both sides another opportunity to resolve the matter without a full hearing. Even at this stage, many claims settle once the debtor is faced with the reality of a formal legal process.

Winning a Small Claims Court judgment confirms what’s owed, but it doesn’t automatically produce payment. If the debtor still doesn’t pay voluntarily, enforcement steps such as garnishment or a writ of seizure and sale may be needed, which our guide to enforcing a judgment in Ontario covers in more detail. It’s worth going in with realistic expectations about this additional step, rather than assuming a judgment alone guarantees payment.

For smaller amounts, or where your time is better spent elsewhere, a licensed collection agency can pursue the debt on your behalf, typically in exchange for a percentage of what they recover. Collection agencies operating in Ontario are regulated under the Collection and Debt Settlement Services Act, which limits how and when they can contact a debtor and requires specific disclosures.

Using a collection agency doesn’t preclude also pursuing a court claim later if the agency isn’t successful, though it’s worth understanding the agency’s fee structure and any exclusivity period before signing on, so you know exactly what recovering the debt will actually cost you in the end.

Reputable collection agencies will also be transparent about their process and won’t promise unrealistic recovery rates or timelines. Be wary of any agency that guarantees a specific outcome, since legitimate collection work depends heavily on the debtor’s own ability and willingness to pay — something no agency can fully control regardless of how aggressively they pursue the file.

The best defence against unpaid invoices is usually built in before the work even starts: clear written terms about payment timing, a deposit for larger projects, defined consequences for late payment, and invoices that are sent promptly and reference the agreement clearly. Businesses that consistently invoice this way tend to see fewer disputes and faster payment overall.

It’s also worth checking Ontario’s limitation period for contract claims if an invoice has been outstanding for a while — waiting too long to act can affect your ability to recover it at all, regardless of how clearly it was owed.

Finally, consider whether ongoing clients who consistently pay late are worth continuing to work with on the same terms. Requiring a deposit upfront, shortening payment terms, or simply declining future work until an outstanding balance is resolved are all reasonable, business-focused responses to a pattern of late payment, rather than something that needs to feel confrontational to put in place.