How present-value damages are calculated in Canada

In a Canadian personal-injury claim, a future loss is worth less than the same dollars today, so it is "discounted" to a present value. You take each future year's projected amount, reduce it for the chance the person is not alive to receive it (mortality), and divide by a compounding discount rate to today's dollars. The sum across all future years is the present value. The inputs (dates, income, discount rate, and life expectancy) drive the result; the arithmetic itself is fixed.

This article explains each piece in plain language. It is background on the method, not legal or actuarial advice for a specific file.

Present value: why future dollars are discounted

A dollar received ten years from now is worth less than a dollar today, because a dollar today could be invested in the meantime. To compare a future stream of losses against a lump-sum award made now, each future amount is divided by (1 + r)ⁿ, where r is the discount rate and n is the number of years away. Adding up all the discounted amounts gives the present value, the single figure a court or settlement uses.

The discount rate

The discount rate is the net, real (after-inflation) rate of return the award is assumed to earn. Several provinces prescribe it. In Ontario, Rule 53.09 of the Rules of Civil Procedure sets the rate: a lower rate for the first 15 years and a higher rate thereafter, updated periodically. A lower discount rate produces a higher present value (future dollars are discounted less), so the rate matters a great deal.

Not every province publishes a prescribed rate; where none applies, the rate is a supported assumption set for the file.

Contingent on survival: mortality and life expectancy

Future income or care costs are only incurred while the person is alive, so each future year is weighted by the probability of surviving to that year. Those probabilities come from published actuarial mortality tables (for example, Statistics Canada life tables). Life expectancy can also be reduced where the medical evidence supports it, which lowers the present value of long-dated future losses.

Past loss vs. future loss

A claim usually separates two periods:

• Past loss runs from the incident to the valuation (or trial) date. It is a historical shortfall, so it is not discounted for survival; instead the without-incident income is typically indexed for inflation (CPI) and the actual earnings over the period are netted off.
• Future loss runs from the valuation date forward: to retirement for income, or over the remaining lifetime for care. This is the part that is discounted to present value and weighted for survival.

Keeping the two periods distinct is important because they use different mechanics.

Loss of income

Future income loss starts from the income the person would have earned but for the incident, nets off any residual earning capacity, and brings the remaining annual shortfall to present value to the assumed retirement age, contingent on survival. Optional contingencies, such as a disability decrement or a termination/unemployment allowance, can further reduce the future stream where appropriate.

Future cost of care

A life-care plan lists future care items (therapies, equipment, attendant care, and so on), each with an amount and a schedule: annually, one-time, or for a set number of years. Each item is brought to present value over its own horizon and weighted for survival, then summed. The total is the present value of future care.

A calculation, not an opinion

DamageIQ is a calculator. It applies the mechanics above to the inputs and assumptions you provide and shows a transparent figure with every input traceable. It is not an expert opinion, and it never claims to be; the assumptions are yours to set and to verify. A signed actuarial report is produced by a retained actuary, not by a calculator; the same applies where the assumptions themselves are in dispute.

Try it

You can generate present-value multipliers for any age, gender, jurisdiction, and discount rate with the free PV Multiplier calculator: the same actuarial factors damages work rests on. The full DamageIQ platform adds loss-of-income and future-cost-of-care files end to end.

By Mike Austin, FCIA, FSA. Fellow of the Canadian Institute of Actuaries and the Society of Actuaries.