Suing Over Unpaid Invoices and Loans

Unpaid invoices and unpaid personal loans are, together, probably the single most common reason people turn to Small Claims Court. Both come down to the same basic story — you provided something of value, on the understanding you'd be paid back, and that hasn't happened. But the two situations differ enough in how they're typically proven that it's worth treating them separately.

Two related but distinct situations

An unpaid invoice usually arises from a business relationship — you did work, delivered goods, or provided a service, and issued an invoice the other party hasn't paid. An unpaid personal loan usually arises from a more informal relationship — lending money to a friend, family member, or acquaintance with an expectation of repayment. Both fit within breach of contract at a legal level, but the evidence you'll rely on tends to look quite different.

Unpaid invoices for work or goods

An unpaid invoice dispute is usually the more straightforward of the two, because businesses tend to generate a natural paper trail — quotes, invoices, delivery records, and communication about the work. The core question is simple: did you do what you agreed to do, at the price agreed, and has the other party failed to pay?

Complications tend to arise around scope — did the completed work match what was actually agreed, or did it change along the way without being properly documented? Keeping a clear record of any changes to scope or price as they happen, rather than trying to reconstruct them later, makes an invoice dispute significantly easier to prove.

Personal loans between individuals

A personal loan dispute often lacks the natural paper trail a business relationship generates, which is exactly why it can be harder to prove — even when the underlying facts are completely true. The core question here is whether you can show that money was actually advanced, and that it was understood between you as a loan rather than a gift.

Text messages, e-transfers with notes, or any written acknowledgment from the other person referencing repayment can be surprisingly powerful evidence in a personal loan dispute, even when there was never a formal loan agreement signed at the outset — the personal loan recovery wizard can help you organize this kind of evidence before you file.

What you need for an invoice dispute

• The original quote, estimate, or agreement describing the work or goods.
• The invoice itself, clearly showing the amount owed and payment terms.
• Proof the work was completed or the goods were delivered — photos, delivery confirmation, or sign-off from the other party.
• Any communication about payment, including reminders you sent and any responses you received.
• A record of any partial payments already made.

What you need for a loan dispute

• Proof the money was actually transferred — a bank record, e-transfer confirmation, or cheque image.
• Any written communication referencing the loan or an expectation of repayment, even informal texts or messages.
• A clear timeline of when the loan was made and when repayment was expected.
• A record of any partial repayments already received.
• Anything showing the other party acknowledged owing the money, even after the fact.

What if there was no written agreement at all?

A completely informal arrangement — no invoice, no written loan agreement, nothing beyond a verbal understanding — is harder to prove, but not automatically hopeless. Courts can and do accept oral agreements supported by circumstantial evidence: consistent conduct, later communications that reference the arrangement, or witnesses to the original agreement. If this describes your situation, focus on gathering whatever indirect evidence exists rather than assuming a lack of paperwork means you have no case.

Dealing with partial payments

If the other party has made some payments but not others, keep a precise running record of every payment received, with dates and amounts, so your claim reflects exactly what's still outstanding rather than the original full amount. This kind of precision strengthens your credibility and makes the dispute easier for anyone reviewing it to follow.

Claiming interest on what's owed

Money owed to you for a period of time can potentially accrue interest, both before and after judgment. See the prejudgment interest calculator for an estimate of interest that may have accrued on your invoice or loan before you even get to judgment, and factor that into the total amount you claim.

Before you file

Whether your dispute is an invoice or a loan, sending a clear, documented demand for payment first is usually worthwhile — see the demand letter builder. Many invoice and loan disputes resolve at this stage, once the other side sees the matter is being taken seriously and clearly documented.

Common mistakes

• Not tracking partial payments precisely, leading to confusion about the actual amount still owed.
• Treating a personal loan casually and failing to preserve whatever informal evidence exists before it's lost or forgotten.
• Letting undocumented scope changes on an invoice muddy what was actually agreed.
• Waiting too long to act, risking limitation period issues — see the filing deadline calculator.
• Not accounting for interest that may have accrued while payment was outstanding.

Frequently asked questions