Cross-Border Workers Are Missing Thousands in Social Security Benefits. Here’s Why.

A 65-year-old who spent eight years working in Toronto during his 30s, then built a 32-year career at a U.S. manufacturer, is ready to retire. He paid into both systems but assumes the Canadian years are lost because he heard you need 10 years of residence to collect from the Canada Pension Plan (CPP). He was wrong, and the difference is worth roughly $449 a month for the rest of his life.

This scenario comes up more than people realize. Forum threads from cross-border workers, snowbirds, and former expats often end with the same shrug: I guess those years don’t count. They do qualify, but only because of a 1984 treaty most retirees have never heard of.

The Treaty That Turns Eight Years Into a Lifetime Check

The U.S.-Canada Social Security Totalization Agreement lets the two countries pool work credits to qualify you for benefits in either system, even when you fall short of the minimum on your own. The CPP normally wants at least one valid contribution and meaningful residence history to pay a retirement pension. Eight years of Canadian contributions clears the contribution bar, and the agreement ensures Service Canada counts the U.S. working years as evidence of workforce attachment, allowing the claim to move forward.

Here is the key distinction most people miss: totalization unlocks eligibility without inflating the benefit. Canada pays based on what was actually contributed during those eight Canadian years, not on a combined 40. Eight years gets a proportional share of what a full CPP retirement pension would pay at 65, which in this scenario works out to roughly $620 CAD a month, or about $449 USD at current exchange rates. Real money that would otherwise go unclaimed.

The U.S. side mirrors the same logic. The American Social Security benefit is calculated entirely on U.S. earnings, and the Canadian years add nothing to the Primary Insurance Amount (PIA). In this case the U.S. benefit at full retirement age (FRA) comes in around $2,650 a month. Stack the Canadian pension on top and total monthly income reaches roughly $3,100, a figure that would have looked impossible to someone who assumed eight years in Canada simply vanished from their financial picture..

How the Two Checks Sit Side by Side

CPP income is taxable in the U.S. the same as Social Security, and the treaty generally avoids double taxation. The CPP payment also counts toward the income thresholds that determine how much of your U.S. Social Security gets taxed, which can nudge a borderline retiree from 50% taxability into the 85% bracket.

Currency is the other variable worth tracking. Your CPP arrives in Canadian dollars. If the loonie weakens 10%, your U.S. spending power from that check drops with it. Over a 25-year retirement, that exposure adds up. Some retirees keep a Canadian bank account and convert in batches when rates are favorable. Others accept the fluctuations and treat the CPP as a small, diversifying income stream.

Timing matters too. CPP can start as early as age 60 with a reduction, or as late as 70 with an increase, and the percentages are not identical to the U.S. formulas. You do not have to claim both pensions on the same day. Many people take CPP at 65 and delay U.S. Social Security to 70 to lock in the 8% annual delayed credit on the larger check.

What to Do Before You File

Two things are worth thinking through carefully:

1. Apply through the SSA and ask specifically about a totalization claim. SSA coordinates directly with Service Canada, which spares you from navigating two bureaucracies in separate countries. Bring records of your Canadian employment dates and any old pay stubs or T4 slips you can find.
2. Decide your claiming ages separately for each system. The U.S. delayed credits and the Canadian adjustment factors are different math. Treating them as one decision usually leaves money behind.

The hardest mistake to undo is assuming foreign work years are worthless and never filing at all. Totalization agreements exist with more than 30 countries, and the rules vary by treaty, so anyone with a stretch of work abroad should check the SSA list before retiring. Your specific numbers will depend on your earnings history in each country, so confirm with both agencies before locking in a claiming date.