Calculating damages for an Ontario civil claim

A damages claim should connect each amount requested to a legally recoverable loss. Begin with a worksheet showing the expense or unpaid amount, its date, the supporting record, and why the other party should be responsible. Deduct payments and credits so the total can be checked.

Separate principal, interest, court fees, and other requested costs. Lost income, repair expenses, inconvenience, and punitive damages involve different legal questions. An upsetting experience does not establish entitlement to every category of compensation. Keep records of reasonable steps taken to limit further loss. A precise calculation can strengthen negotiations and help you decide whether the likely recovery justifies the proceeding. Avoid inflating the amount to create bargaining room.

For a repair claim, distinguish the amount needed to restore the property from an upgrade you chose to purchase at the same time. For an unpaid account, identify the accepted price and remove work already credited or paid. Where several events contributed to a loss, explain why the defendant is responsible for the amount requested. Attach invoices, estimates, photographs, or income records as appropriate, and label an estimate as an estimate rather than presenting it as an expense already incurred.

Consider the reasonable steps available to reduce continuing loss. If a damaged item could be protected from further deterioration, record what you did and any practical limits. Keep your calculation current as payments, repairs, or replacement costs change. The same loss should not be counted twice under different headings. A useful settlement discussion starts with a transparent amount that can be checked, then addresses the risks of proving responsibility and recovering payment. The largest possible demand is not always the most persuasive one.

Sources

• Ontario guide to making a Small Claims Court claim
• Ontario prejudgment and postjudgment interest rates

Read next: Considering a counterclaim in Small Claims Court

General Ontario legal information, not legal advice for your matter, and reading it does not create a retainer. Sources checked 15 October 2026: check the current law, forms and dates before you act.

Photos from Pexels: A wooden gavel on a courtroom table beside case folders · The Frontenac County Court House in Kingston, Ontario.

This article is general information for people in Ontario, not legal advice. Rules, forms and deadlines change, and every situation is different. Check the current rule or speak to a licensed legal professional before you act.