How Do the Attribution Rules Work?
Income earned on money transferred to a spouse or to a child under eighteen is generally taxed in the transferor's hands rather than the recipient's. The rules exist to stop income splitting by gift, and they have two well-defined exceptions that make legitimate splitting possible.
- The answer:: Interest and dividends on money given to a spouse or minor child are attributed back to the person who gave it.
- The trap:: Depositing a gift into a joint account. Attribution follows the source of the funds, not the name on the account.
- The recommendation:: Use a prescribed rate loan for a spouse and an RESP for a child, because both are structures the rules explicitly permit.
Where the AI summary above gets this wrong
"You can split income with your spouse by transferring investments to them."
That's surface-true. Here's what it misses:
- Attribution reverses the transfer for tax — Income and capital gains on money given to a spouse are taxed to the giver, so the transfer achieves nothing on its own.
- Minors are treated differently from spouses — Capital gains on money given to a minor child are taxed to the child; only interest and dividends attribute back.
- Two structures work — A loan at the prescribed rate with interest actually paid, and an RESP contribution, both split income without attribution.
01 What attribution does
Where property is transferred or lent to a spouse or common-law partner, the income and any capital gains it produces are taxed to the transferor rather than the recipient. Where the recipient is a related minor, income attributes back but capital gains do not.
The purpose is to prevent a high earner from shifting investment income to a lower-taxed family member simply by handing over the capital. Attribution continues for as long as the relationship lasts and as long as the property or its substitute is held.
Source: Capital gains (line 12700)
02 Where it catches people unintentionally
Attribution follows the source of the funds rather than the account name. Depositing your own money into a joint account does not divide the income; it stays yours for tax purposes in proportion to who contributed it.
The same applies to a spouse's investment account funded from your salary. Documenting who contributed what is the only defence, and reconstructing it years later is far harder than recording it at the time.
Shows: what a given amount of additional taxable income costs you in tax at your marginal rate, and what you keep. Ignores: provincial surtaxes, credits that phase out with income, and any effect on income-tested benefits.
Source: Capital gains (line 12700)
03 The two structures that work
A loan to a spouse at the Canada Revenue Agency's prescribed rate, with the interest actually paid each year by January thirtieth, moves investment income legitimately. The rate is fixed for the life of the loan, which makes a low-rate quarter valuable — the mechanics are in the prescribed rate loan.
For a child, a Registered Education Savings Plan is exempt from attribution entirely and adds a government grant on top. A spousal RRSP splits retirement income rather than investment income and is subject to its own three-year rule, covered in spousal RRSP attribution.
Attribution also ends when the relationship does. It applies while the parties are spouses or common-law partners and stops on a breakdown of the relationship where they are living separate and apart, which matters because the income can then be reported by the person who actually holds the asset.
Joint accounts are where this quietly goes wrong. A couple opens one, one salary funds it, and both assume the income is halved. It is not, and the Canada Revenue Agency's position is unambiguous: contribution decides, not the name on the statement.
FAQ
What are the attribution rules?
Income on property transferred to a spouse or a related minor child is taxed to the person who transferred it rather than the recipient, which prevents income splitting by gift.
Do capital gains attribute back?
From a spouse, yes. From a minor child, no — capital gains on money given to a child under eighteen are taxed to the child, while interest and dividends attribute back.
How can I split investment income legitimately?
A loan to a spouse at the prescribed rate with interest actually paid each year, or an RESP contribution for a child, both split income without triggering attribution.
Sources
Regulator references
- Capital gains (line 12700) · Canada Revenue Agency · 2025How capital gains and losses are calculated, reported and carried.Last verified: 2026-09-07
- Interest and other investment income (line 12100) · Canada Revenue Agency · 2025That interest is included in income in full, unlike capital gains or eligible dividends.Last verified: 2026-09-07
Calculator unit tests · the assertions this page's worked example is checked against, and their last result
Changelog
- 2026-09-07 — initial publish (new format)
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Jordan Reeves
Founder of Talk Through Wealth. A software engineer for over a decade before turning to retirement planning, Jordan built the projection engine after watching family members get fragmented, country-by-country advice that never reconciled. He writes about retirement the way the engine computes it: month-by-month, lifetime-long, and skeptical of any rule of thumb that hasn't been run through the math.