Income Splitting Across the Border: What Canada Allows, What the US Allows, and What Stops Working When a Spouse Moves

Canada and the United States take opposite approaches to taxing couples, and the income-splitting strategies that work in one country do not transfer to the other. The US taxes married couples on a joint return with wide brackets, which is itself a form of splitting; Canada taxes each spouse individually and then permits specific, narrow forms of splitting (pension income, spousal RRSPs, prescribed-rate loans) while blocking others with attribution rules and the tax on split income. A couple that moves, or that lives on opposite sides of the border, finds that the Canadian tools stop working when one spouse is a non-resident and the US joint return brings in income Canada never expected to see.

Key takeaways

• Canada taxes individuals. Splitting tools: pension income splitting (up to 50% of eligible pension income, RRIF income after 65, and certain annuities allocated to the spouse on Form T1032); spousal RRSP contributions (deducted by the contributor, withdrawn by the spouse after three years); prescribed-rate loans to a spouse or family trust; CPP pension sharing. Blockers: attribution of income and gains on property gifted or lent to a spouse or minor child; the tax on split income (TOSI), which taxes dividends and certain income from a related private business to family members at the top rate unless an exclusion applies.
• US taxes married couples jointly if they elect: the joint brackets and standard deduction are twice the single amounts, which splits income between spouses automatically. No pension splitting, no spousal retirement contribution rule beyond the spousal IRA, no TOSI; gifts between US-citizen spouses are unlimited and income on gifted property is taxed to the recipient.
• Cross-border: pension income splitting requires both spouses to be Canadian residents at year-end; a spousal RRSP contribution for a non-resident spouse is permitted but the withdrawal is taxed to the non-resident with Part XIII withholding; TOSI applies regardless of the family member's residence; the US joint return under section 6013(g) with a Canadian spouse imports that spouse's worldwide income.

Canada's tools

Pension income splitting. A taxpayer with eligible pension income (registered pension plan payments at any age; RRIF, LIF, and annuity income at 65 or older) can allocate up to 50% to a spouse or common-law partner by joint election on Form T1032 each year. The allocation moves the income to the spouse's return and the withholding proportionately. Both spouses must be Canadian residents at the end of the year; a couple with one spouse in the US cannot split.

Spousal RRSP. The higher earner contributes to an RRSP in the spouse's name, deducts the contribution against their own income, and the spouse withdraws it in retirement at the spouse's rate. Withdrawals within three calendar years of a contribution are attributed back to the contributor. A non-resident spouse can hold a spousal RRSP; withdrawals are subject to 25% Part XIII withholding and taxed in the spouse's country of residence.

Prescribed-rate loans. A loan to a spouse or a family trust at the CRA's prescribed rate, with interest paid annually by January 30, avoids attribution on the income earned on the loaned funds above the prescribed rate. The strategy works while the borrower is a Canadian resident taxed at a lower rate.

CPP sharing. Spouses can share CPP retirement pensions earned during the relationship, reallocating up to half.

TOSI. Dividends, interest, and certain gains from a private corporation paid to a spouse, child, or other related person are taxed at the top marginal rate unless an exclusion applies (the recipient is 65 or older and the payer is the spouse; the recipient is 25 or older and holds excluded shares; the recipient actively worked in the business 20 hours a week in the year or any five prior years; the business is an excluded business). TOSI applies to Canadian-resident recipients; a non-resident recipient is subject to Part XIII withholding on the dividend instead, which can be lower.

The US approach

A married couple filing jointly reports combined income on one return with brackets and a standard deduction twice the single amounts; the result is roughly what two single filers with equal incomes would pay. No specific splitting mechanism is needed. Gifts between US-citizen spouses are unlimited and tax-free, and income on gifted property is taxed to the recipient (no attribution). The spousal IRA allows a non-working spouse to contribute to an IRA based on the working spouse's earned income. Community property states (California, Texas, Washington, Arizona, and others) split community income equally between spouses by operation of law, which matters for a couple filing separately.

When spouses are in different countries

Canadian resident with a US-resident spouse. Pension splitting is unavailable (the US spouse is not resident at year-end). Spousal RRSP contributions are permitted; the US spouse's withdrawals face 25% withholding and US tax. Prescribed-rate loans lose their point if the US spouse is taxed at a similar rate. Attribution on gifts to the non-resident spouse applies only to Canadian-source income taxable in Canada. The Canadian spouse may claim the spousal amount if the US spouse's worldwide income is low.

US citizen in Canada with a Canadian spouse. The 6013(g) joint-return election imports the Canadian spouse's worldwide income into the US return; the US joint brackets 'split' the income for US purposes, but the compliance cost (the Canadian spouse's TFSA, mutual funds, and corporation on the US return) usually exceeds the benefit. Canada's pension splitting and spousal RRSP work normally because both are Canadian residents.

Couple moving together to the US. Canadian pension splitting ends the year of departure (neither is resident at year-end). RRIF income is then taxed to the annuitant in the US with 15% Canadian withholding; the US joint return provides the splitting. Spousal RRSPs continue to be treaty-deferred. A Canadian corporation's TOSI rules stop mattering once the family is non-resident, but the corporation becomes a CFC.

Worked example

A retired Toronto couple with $80,000 of RRIF income to him and $10,000 of investment income to her move to Naples in June.

• Before departure. Form T1032 splits up to $40,000 of his RRIF income to her each year, saving roughly $8,000 of Ontario tax at their rates.
• Departure year. Neither is a Canadian resident at December 31; no pension splitting for the year. The RRIF income after departure is his alone with 15% withholding.
• After. The US joint return taxes their combined income at joint rates, which approximates the split; the 15% Canadian withholding on his RRIF is a foreign tax credit. Florida has no state tax.
• Net. The Canadian splitting tool is replaced by the US joint return; the outcome is similar, but the mechanism and the withholding are different.

Official sources

"If the transferring spouse or common-law partner and receiving spouse or common-law partner have jointly elected to split their eligible pension income by completing Form T1032, Joint Election to Split Pension Income, the transferring spouse or common-law partner must deduct on line 21000 of their return the elected split-pension amount." — Canada Revenue Agency, Line 21000 – Deduction for elected split-pension amount, https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/tax-return/completing-a-tax-return/deductions-credits-expenses/line-21000-deduction-elected-split-pension-amount.html

"Tax on split income (TOSI) is a special tax that applies to certain income received from a related business." — Canada Revenue Agency, Line 40424 – Federal tax on split income, https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/tax-return/completing-a-tax-return/deductions-credits-expenses/line-40424-federal-tax-on-split-income.html

"Each spouse must report their entire worldwide income for the year you make the choice and for all later years unless the choice is ended or suspended." — Internal Revenue Service, Nonresident Spouse, https://www.irs.gov/individuals/international-taxpayers/nonresident-spouse

Practitioner note

The Canadian splitting tools are conditional on residence, and the departure year is the year they stop: no pension splitting when one spouse is non-resident at December 31, spousal RRSP withdrawals taxed to a non-resident at 25%, prescribed-rate loans to a spouse in a no-tax state achieving nothing. We rework the couple's splitting plan for the departure year before the move, and we rebuild it on the US side with the joint return.

See also: Planning a move? Start with the Canada-to-US tax checklist and browse every corridor by city, province, and state.

Next step

Fairlight prepares the income-splitting analysis for cross-border couples, the departure-year adjustments, and the returns in both countries. See cross-border pricing or book a call.