Estate Planning With Mixed-Citizenship Children: Which Assets to Leave to the American Kid, Which to the Canadian, and Why Equal Isn't Identical

Parents instinctively draft symmetric wills — everything divided equally, in kind, among the children — and for mixed-citizenship families symmetry is precisely the error. The same asset carries different after-tax value depending on which child receives it, because the American child's inheritance keeps generating US filings and US tax character forever, while the Canadian child's version of the identical bequest is domestic simplicity. The matching logic runs asset class by asset class. Canadian mutual funds and Canadian-listed ETFs: PFICs in the American child's hands — Forms 8621, punitive default taxation, an inheritance that arrives pre-complicated; route them to Canadian children, or direct the executor to liquidate before distributing the American's share. Interests in continuing Canadian trusts: the American beneficiary's annual 3520s, beneficiary statements, and throwback exposure make the ongoing-trust bequest the highest-maintenance gift in the toolbox — where control or protection genuinely requires a trust for the American child, it gets designed for US legibility (current distributions, US-clean holdings, cooperative trustees) rather than inherited from the Canadian sibling's template. US-situs assets — the Florida condo, the US brokerage positions: neutral-to-favorable for the American child (domestic assets to their system, stepped-up basis, no cross-border machinery), while the Canadian child inheriting them takes on FIRPTA-at-sale, US estate-situs exposure of their own, and T1135 lines — the clean matching sends American dirt and American paper south to the American. Registered plans: RRSP/RRIF proceeds tax on the parent's final return regardless of heir, so the money arrives as cash either way — allocable freely — though naming the American child as direct beneficiary of the plan itself adds their withholding-and-credit mechanics on post-death amounts. Cash and GICs: the universal solvent, matching anyone, which is why equalization runs through it. The drafting that implements the logic: specific-asset gifts or executor allocation powers with a memorandum of wishes stating the matching principle; an equalization clause that trues up by after-tax-aware value; the executor granted express authority to liquidate designated classes before distribution (the pre-distribution sale of the funds destined for the American child converts a PFIC problem into cash at stepped values); and the passport audit — the planning ritual every mixed family's file opens with — refreshed at each review, because the daughter's green card or the grandson's Buffalo birth re-sorts the matrix.

Key takeaways

• Equal by value, not by kind: symmetric in-kind division hands the American child assets their system punishes; asset-matched wills equalize dollars while sorting classes to the child whose tax system treats each kindly.
• The sort, condensed: Canadian funds and fund-heavy accounts → Canadian children (or liquidate for the American's share); ongoing Canadian trusts for American children → redesign or avoid; US real estate and US securities → American children; cash and registered-plan proceeds → the equalizer.
• Executor powers do the heavy lifting: authority to allocate in satisfaction of shares, to liquidate specified classes pre-distribution, and to consider tax character in equalization — drafted expressly, guided by a memorandum, so the matching survives whichever assets exist at death.
• The trust exception is designed, not defaulted: where the American child's share needs a trust (age, protection, control), it distributes income currently, holds US-clean assets, and issues beneficiary statements — the batch-29 spousal-trust discipline applied down a generation.
• Life insurance is the mixed-family workhorse: proceeds arrive tax-free in Canada and are not US-situs for a Canadian insured — clean value to either child, and the standard tool for equalizing a business or property that logically goes whole to one child.
• Refresh on family events: marriages, moves, green cards, and US-born grandchildren each re-run the matrix; the passport audit is an annual review line, and the will's flexibility powers are what keep redrafting rare.

The equalization worksheet

The working document behind the will is a two-column worksheet: each asset class at projected value, annotated with its after-tax friction in each child's hands (the PFIC drag, the trust's annual compliance, the FIRPTA process, the clean-cash zero), and a draft allocation that matches classes then trues up with cash and insurance. The worksheet also surfaces the lifetime moves that beat testamentary ones: the parents' own portfolio migrating out of Canadian funds (serving their US-situs exposure too), the pre-death gift program where exemptions and deemed-disposition costs favor it, and the beneficiary designations — plan by plan — aligned with the same matrix. Estate planning for mixed families is the same worksheet run at three ages, and the will is merely its final printout.

Worked example

A widowed Oakville mother, estate C$4.2 million, has a Toronto daughter and a Chicago son (US citizen). Her holdings: the C$1.4M house, C$1.1M of Canadian equity funds, C$700,000 of US-listed stocks, a C$600,000 RRIF, and C$400,000 cash. The symmetric draft — everything split in kind — would hand her son C$550,000 of PFICs (a decade of 8621s), half a Canadian house sale process, and his share of a fund-heavy estate account. The matched draft instead: the daughter's share is anchored by the Canadian funds and her preferred claim on the house; the son's share is anchored by the US-listed stocks (domestic to him, stepped-up basis) and cash; the RRIF — taxed on the final return, arriving as cash — and the remaining cash true up the values; the executor holds express power to liquidate any Canadian funds falling to the son's share before distribution; and a C$300,000 last-to-die insurance policy, added at the review, covers the equalization stretch so neither child's share depends on selling the house on a deadline. The memorandum states the principle in three sentences so the executor — the daughter — can defend allocations that look unequal in kind. At the mother's death, the son receives US assets and cash requiring one Form 3520 and nothing else annually; the daughter receives Canadian assets her system handles natively; and the values match to the dollar — equal, because it wasn't identical.

Official sources

"A U.S. person that is a direct or indirect shareholder of a passive foreign investment company (PFIC) files Form 8621 if they: Receive certain direct or indirect distributions from a PFIC ... Recognize a gain on a direct or indirect disposition of PFIC stock ... [or] are reporting information with respect to a QEF or section 1296 mark-to-market election." — Internal Revenue Service, About Form 8621, https://www.irs.gov/forms-pubs/about-form-8621

"U.S. persons (and executors of estates of U.S. decedents) file Form 3520 to report: Certain transactions with foreign trusts. Ownership of foreign trusts under the rules of sections Internal Revenue Code 671 through 679. Receipt of certain large gifts or bequests from certain foreign persons." — Internal Revenue Service, About Form 3520, https://www.irs.gov/forms-pubs/about-form-3520

Practitioner note

Mixed-family wills fail through fairness instincts: the equal-in-kind division that reads as love drafts a compliance sentence for the American child. Our planning meetings run the two-column worksheet — every class priced in each child's hands — and the outputs are always the same four: matched allocations, executor liquidation powers, insurance closing the equalization gap, and a memorandum that lets the executor be unequal in kind because the parents said why. The annual line item that keeps it current is the passport audit.

See also: For Canadian parents gifting money to US children, see Canadian parents gifting money to US children; and browse every cross-border tax topic guide, organized by situation.

Next step

Fairlight prepares the mixed-citizenship estate design — the asset-matching worksheet, will and memorandum drafting with executor powers, insurance-based equalization, beneficiary designation alignment, and the annual passport audit. See cross-border pricing or book a call.