Cross-Border Alimony and Child Support: Tax When Payments Cross the Canada-US Border

Alimony and child support that cross the Canada-US border create a tax mismatch that the treaty does not fully resolve. The US eliminated the tax deduction for alimony paid under agreements executed after December 31, 2018, and simultaneously eliminated the income inclusion for the recipient. Canada still operates under the traditional model: the payer deducts support payments, and the recipient includes them in income. When the payer is in one country and the recipient is in the other, these contradictory rules collide.

How is alimony taxed in the US after 2018?

For agreements executed or modified after December 31, 2018 (without specifying that the pre-2019 rules apply), the Tax Cuts and Jobs Act eliminated both the deduction for the payer and the income inclusion for the recipient. Alimony is now a non-event for US federal income tax: the payer pays with after-tax dollars, and the recipient receives it tax-free.

For agreements executed before January 1, 2019 (and not subsequently modified to adopt the new rules), the old rules still apply: the payer deducts alimony, and the recipient includes it in income. These pre-2019 agreements are grandfathered and will continue under the old rules unless the parties amend the agreement and explicitly elect the new treatment.

The US rules apply regardless of where the recipient lives. A US payer who sends alimony to a recipient in Canada cannot deduct the payment (post-2018 agreement). A US recipient who receives alimony from a Canadian payer does not include it in US income (post-2018 agreement).

How is alimony taxed in Canada?

Canada did not follow the US change. Under ITA 56(1)(b), the recipient of a “support amount” includes it in income. Under ITA 60(b), the payer deducts it. A “support amount” is a periodic payment for the maintenance of the recipient, the children of the recipient, or both, payable under a court order or written agreement.

The deduction/inclusion model applies to all support amounts that meet the definition, regardless of when the agreement was executed. Canada did not create a pre-2019/post-2018 distinction.

The critical distinction in Canada is between “support amounts” (deductible/taxable) and “child support amounts” (not deductible/not taxable). Since May 1, 1997, child support (amounts specifically identified as being solely for the support of a child) is neither deductible by the payer nor taxable to the recipient. Only the “spousal support” component (or unallocated support that is not specifically designated as child support) follows the deduct/include model.

Payments made directly to a third party, such as a mortgage lender or a school, can still qualify as support amounts if the court order or written agreement specifies them as such.

What happens: payer in the US, recipient in Canada?

This is the most common mismatch scenario. A US-resident payer sends alimony to a Canadian-resident recipient under a post-2018 agreement.

US payer’s position: No deduction. The payment is made with after-tax dollars. No US reporting obligation related to the alimony (no 1099, no Form 1040 line item).

Canadian recipient’s position: The CRA’s position is that if the payment meets the definition of a “support amount” under ITA 56(1)(b) (periodic, for maintenance, under a written agreement or court order), the Canadian recipient must include it in income. The fact that the US does not allow the payer a deduction does not change Canada’s domestic inclusion rule. Canada taxes what Canada’s rules say is taxable, regardless of the other country’s treatment.

The result is an asymmetry: the payer gets no tax benefit, and the recipient pays tax. Under the old (pre-2019) rules, the payer would have deducted and the recipient would have included, producing a roughly symmetric result. The new rules shift the after-tax cost entirely to the payer (who cannot deduct) while the recipient still bears Canadian tax on the receipt.

The treaty does not fix this. Article XVIII(3) provides that alimony and similar payments arising in one country and paid to a resident of the other country are taxable only in the residence country of the recipient (or in the country of the payer, if the payer claims a deduction). Since the US payer does not claim a deduction (cannot claim one under post-2018 law), the alimony is taxable only in Canada (the recipient’s country). This is the same result the domestic rules produce: Canada taxes the recipient, and the US does not tax or allow a deduction.

What happens: payer in Canada, recipient in the US?

The reverse scenario. A Canadian-resident payer sends alimony to a US-resident recipient.

Canadian payer’s position: Deducts the support amount under ITA 60(b), reducing Canadian taxable income.

US recipient’s position: For a post-2018 agreement, the US does not tax the alimony. The recipient does not include it in US income. The payment is tax-free in the US.

This creates a different asymmetry: the payer gets a tax benefit (Canadian deduction), and the recipient pays no tax. This is a favorable outcome for the paying spouse and the receiving spouse combined, as the total tax on the payment is negative (a net deduction with no corresponding inclusion).

The treaty analysis under Article XVIII(3): the alimony arises in Canada and is paid to a US resident. The Canadian payer claims a deduction, so under the treaty, Canada retains the right to tax the payment (which it does not, because Canada gives the deduction). The US is the residence country of the recipient, and the US does not tax it (post-2018 rules). The result: no tax anywhere on the alimony, with the Canadian payer getting a deduction that reduces their tax on other income.

This outcome is better than either the pure-US result (no deduction, no inclusion) or the pure-Canadian result (deduction plus inclusion). Cross-border couples divorcing under a post-2018 agreement may want to consider whether structuring the support payments from the Canadian-resident spouse (if that matches the facts) produces a better combined tax result.

How is child support treated across the border?

Child support is not deductible and not taxable in either country. The US has never allowed a deduction for child support. Canada eliminated the deduction/inclusion for child support (amounts specifically designated as child support) effective May 1, 1997.

Cross-border child support payments have no tax consequences for either the payer or the recipient. No special treaty analysis is needed, and no forms are required for the child support itself.

The distinction between spousal support and child support in the agreement matters enormously. An agreement that specifies $2,000/month in child support and $1,500/month in spousal support produces a clear allocation. An agreement that specifies $3,500/month in “family support” without allocating between spousal and child support may be treated as unallocated support, which Canada treats as entirely spousal support (deductible/taxable) unless the child support amount can be determined.

Does the foreign tax credit apply to support payments?

It generally doesn’t, because the two taxes fall on different taxpayers. The foreign tax credit relieves double taxation when the same person is taxed by both countries on the same income. When the payer is taxed in one country and the recipient is taxed in the other, neither can claim a credit for the other’s tax.

The exception is dual filers, mainly US citizens or green card holders living in Canada. A US citizen living in Canada who receives spousal support includes it in Canadian income under ITA 56(1)(b) and is also subject to US taxation on worldwide income. Under a post-2018 agreement, the US does not tax the alimony, so there is no US tax on it and no credit is needed. Under a pre-2019 agreement, the US would include the same payment as income, and the Canadian tax paid on it would be creditable on Form 1116.

Are lump-sum settlements deductible or taxable?

Lump-sum payments generally do not qualify for the deduction/inclusion treatment in Canada; the payments must be periodic to meet the definition of a support amount under ITA 60(b). The pre-2019 US rules also required periodicity. A one-time equalization payment is a property division, not alimony, and is not deductible or taxable as support in either country.

Arrears paid in a lump sum, catching up on periodic payments that were missed, can still qualify as periodic payments in Canada, because they represent unpaid periodic obligations rather than a new lump-sum settlement.

What about enforcement and collection across the border?

The Uniform Interstate Family Support Act (UIFSA) in the US and the Interjurisdictional Support Orders Act (ISO) in Canadian provinces provide mechanisms for enforcing support orders across the border. Canada and the US have reciprocal agreements for the enforcement and collection of support obligations.

The tax treatment follows the domestic rules of each country, not the enforcement mechanism. A Canadian court order enforced in the US through UIFSA does not change the US tax treatment of the payment (still non-deductible, non-taxable for post-2018). A US court order enforced in Canada through ISO does not change the Canadian tax treatment (still deductible by the payer, taxable to the recipient, for spousal support).

What forms are required?

US resident paying alimony to a Canadian recipient (post-2018):

• No US forms related to the alimony (no deduction, no reporting)
• The Canadian recipient files a T1 including the support amount in income

Canadian resident paying alimony to a US recipient (post-2018):

• Canadian T1 claiming the deduction on line 21999/22000
• The US recipient does not report the alimony on Form 1040

Pre-2019 agreements still under the old rules:

• US payer: deduction on Form 1040, Schedule 1 (line 19a), must report the recipient’s SSN or ITIN
• US recipient: income on Form 1040, Schedule 1 (line 2a)
• Canadian payer: deduction on line 21999/22000 of T1
• Canadian recipient: income on line 12800 of T1
• Foreign tax credit forms as applicable if the same payment is taxed in both countries

What should I do next?

If you are paying or receiving spousal support across the Canada-US border, start with the execution date of the agreement, because it decides which US rules apply. Then check which direction the money flows, because the tax result is not symmetric. Run the combined after-tax cost on both sides before you negotiate the amount.

• Cross-border divorce: splitting retirement accounts, the retirement account division companion
• Filing jointly with a non-resident Canadian spouse (section 6013(g)), relevant when the divorce hasn’t happened yet and a joint election is in place
• Income splitting: Canada vs US cross-border, the broader context of moving income between spouses
• Form 1116 and how Canadian tax changes affect the US credit, the FTC mechanics for dual filers receiving support

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.