The US Child Tax Credit for Families in Canada: Why Claiming the Exclusion Forfeits It, and When the Credit Is Refundable Cash

The child tax credit is the largest US benefit most American families in Canada leave unclaimed, and the reason is a form choice made years earlier by a preparer optimizing the wrong number. The credit's rules: a credit per qualifying child under 17 at year-end who is a US citizen, national, or resident with a valid Social Security number issued before the return's due date, claimed as a dependent, and living with the taxpayer for more than half the year (with the residency test met by children living with the parent anywhere — the family need not be in the US); the credit is US$2,200 per qualifying child for 2025 and 2026 (raised from US$2,000 by the 2025 tax act and now indexed for inflation), phases out above modified adjusted gross income thresholds (US$200,000 single, US$400,000 joint), and is non-refundable to the extent of the taxpayer's US tax — with the refundable portion, the additional child tax credit, computed as 15% of earned income above a US$2,500 floor, up to US$1,700 per child, and paid as a refund even where the taxpayer's US tax is zero; the taxpayer (and spouse, on a joint return) must also now hold a Social Security number valid for employment. The family abroad's position: an American parent in Canada earning a Canadian salary has, after the foreign tax credit, little or no US tax — so the non-refundable credit has nothing to offset and only the refundable portion matters; and the refundable portion is unavailable to any taxpayer who claims the foreign earned income exclusion (or the foreign housing exclusion) for the year — the statute excludes them from the additional child tax credit entirely. The exclusion trap, then: a family whose preparer has been claiming the foreign earned income exclusion on the Canadian salary (because it zeros the US tax simply, and because US preparers reach for it by reflex) has forfeited the refundable child tax credit every year the exclusion was claimed — often a four-figure annual refund, for each child, for as many years as the exclusion ran; the foreign tax credit method, by contrast, also zeros the US tax on the Canadian salary (Canadian tax exceeds US tax at nearly every income level), preserves the refundable portion, and produces excess credits that carry forward — the credit method is better for families in Canada on every axis, and the exclusion is right only for expats in low-tax countries, which Canada is not. Switching methods: a taxpayer who has claimed the exclusion may revoke it (by claiming the credit instead on a return, with the revocation statement), but a revocation bars re-electing the exclusion for five years without IRS consent — a constraint that doesn't bother the Canadian-resident family (they won't want the exclusion back) but that should be understood; and amended returns for open years (three years from filing) can switch to the credit method and claim the refundable credit retroactively, recovering the forfeited refunds for those years — a routine repair in this corridor. The annual computation for the credit-method family: earned income (the Canadian salary, converted); the credit per child; the family's US tax after the foreign tax credit (usually zero); the additional child tax credit at the statutory percentage of earned income above the floor, capped per child, claimed on the appropriate schedule with the children's SSNs; the refund. The interactions: the children's Social Security numbers must exist — an American parent's child born in Canada is usually a US citizen by descent (the transmission rules in the citizenship-through-a-parent guide) and obtains an SSN through the consulate's report of birth abroad process, and a child without an SSN by the return's due date is not a qualifying child for the credit (an ITIN does not qualify); the Canada Child Benefit is excluded from the parent's US income under the documented position (the benefit guide) and does not affect the credit; the mixed couple's joint election (bringing the Canadian spouse into the US return) raises the phase-out threshold to the joint level and adds the Canadian spouse's earned income to the refundable computation — sometimes favorable, modeled per the joint-election guide; and the credit's interaction with the net investment income tax and other MAGI-based items runs on the credit method's higher MAGI (the exclusion reduces MAGI; the credit doesn't — but the exclusion is added back for most of those computations anyway). The catch-up angle: a family filing streamlined or delinquent returns for prior years uses the credit method on those returns and claims the refundable credit for each — but refunds are payable only for years within the refund statute (three years from the return's due date, for a late-filed return, measured from filing), so the oldest catch-up years' credits are lost while their compliance value remains — one of the concrete costs of delay the catch-up guides count.

Key takeaways

• The credit is available to families abroad: US$2,200 per qualifying child under 17 with a valid SSN (2025–2026, indexed), living with the parent anywhere; non-refundable against US tax, with a refundable portion (up to US$1,700 per child) computed on earned income.
• The refundable portion is the whole game for families in Canada: Canadian tax zeros the US liability, so only the refund matters — and it is a per-child cheque for families with earned income above the floor.
• The exclusion forfeits it: claiming the foreign earned income exclusion disqualifies the family from the additional child tax credit entirely; the foreign tax credit method zeros the same US tax and keeps the refund — the credit method wins for Canada on every axis.
• Switch and amend: revoking the exclusion (five-year re-election bar, irrelevant to Canadian residents) and amending open years to the credit method recovers forfeited refunds — a routine repair.
• SSNs are the gate: children need Social Security numbers by the return's due date (the report-of-birth-abroad process for Canadian-born children of US citizens); ITINs don't qualify.
• Interactions: the Canada Child Benefit doesn't affect it; the joint election can raise the threshold and the earned-income base; catch-up returns claim it but only within the refund statute.

The family's annual credit routine

Confirm each child's SSN and qualifying status. Report the Canadian salary and claim the foreign tax credit (never the exclusion). Compute the credit per child, the US tax after credits (usually zero), and the additional child tax credit on earned income. File with the refund claim. If prior years used the exclusion: amend the open years to the credit method and claim the refunds. If a child lacks an SSN: start the consular process now, because next year's credit depends on it. One schedule a year, and for many families the largest US tax refund they will ever receive.

Worked example

An American couple in Ottawa, both US citizens, earn C$150,000 combined in Canadian salaries and have three children, all US citizens with SSNs. Their prior preparer claimed the foreign earned income exclusion for both spouses for six years — US tax zero every year, and no child tax credit refund ever claimed (the exclusion barred it). The repair: the current year switches to the foreign tax credit method (revocation statement attached) — US tax after credits still zero, and the additional child tax credit on their earned income produces a refund of several thousand dollars for the three children; the three open prior years are amended to the credit method, recovering three years of forfeited refunds — a five-figure recovery in one filing season; the three closed years are lost, which is the cost of the six-year exclusion habit. Going forward: the credit method every year, the refund every spring, and the excess foreign tax credits carrying forward for the year one of them takes a US assignment. Their neighbor's version, with the same family and no repair: the exclusion continues, the refunds never arrive, and the preparer's explanation — "the exclusion is simpler" — costs a family more each year than the preparer's fee.

Official sources

"The Child Tax Credit is worth up to $2,200 per qualifying child," and to claim the full amount "your annual income" must be "not more than $200,000 ($400,000 if filing a joint return)"; each qualifying child "must have a Social Security number that is valid for employment in the United States and issued before the due date of the tax return." — Internal Revenue Service, Child Tax Credit, https://www.irs.gov/credits-deductions/individuals/child-tax-credit

The IRS explains that a qualifying taxpayer "may qualify to exclude your foreign earnings from income up to an amount that is adjusted annually for inflation." — Internal Revenue Service, Foreign Earned Income Exclusion, https://www.irs.gov/individuals/international-taxpayers/foreign-earned-income-exclusion

Practitioner note

The child tax credit is the largest US refund American families in Canada leave on the table, and the reason is always the same form: a preparer claiming the foreign earned income exclusion by reflex, which zeros a US tax the foreign tax credit would have zeroed anyway while forfeiting the refundable credit for every child. Our family routine uses the credit method without exception, amends the open exclusion years to recover the forfeited refunds, and starts the consular SSN process the year a child is born — because the credit's gate is a number, and the number takes months.

See also: For what claiming Canadian citizenship by descent changes on your taxes, see what claiming Canadian citizenship by descent changes on your taxes; and browse every cross-border tax topic guide, organized by situation.

Next step

Fairlight prepares the family credit engagement — method selection (foreign tax credit over exclusion) with revocation where needed, the annual child tax credit and refundable computation, amended returns for open exclusion years, and SSN coordination for Canadian-born children. See cross-border pricing or book a call.