Canada's tax system is built on the principle that income is taxed in the hands of the person who earned it. Attribution rules are the Income Tax Act's enforcement mechanism for that principle — they exist specifically to prevent higher-income Canadians from shifting investment income to lower-earning family members to reduce the household's overall tax bill. If you have ever considered giving money or assets to a spouse or child to have the investment returns taxed at their lower rate, attribution rules are the reason that plan likely will not work the way you intended.
Attribution rules are provisions in the Income Tax Act (ITA) that "attribute" income or capital gains earned on transferred property back to the person who originally transferred it — the transferor. In plain terms: if you give or lend money or property to a family member and that property generates income, CRA may treat that income as yours for tax purposes, even though the money is legally sitting in your spouse's or child's account.
The rules exist to close what would otherwise be a straightforward income-splitting loophole. Without them, a high-earning professional could simply transfer a portfolio to a lower-income spouse, have the dividends taxed at 20% instead of 50%, and achieve a dramatic reduction in the household tax burden. Parliament decided that income earned on transferred family property should not escape the transferor's tax bracket that easily.
Understanding where these rules apply — and where they do not — is essential for any meaningful tax planning involving family members.
The spousal attribution rules are the most comprehensive version of the regime. Under section 74.1 of the ITA, if you transfer or loan property to your spouse or common-law partner, any income or loss from that property is attributed back to you. This applies to dividends, interest income, and rental income. The attribution is automatic — CRA does not need to audit you specifically; it simply applies to all qualifying transfers unless an exception is in place.
What makes the spousal rules particularly broad is section 74.2, which extends attribution to capital gains. If you gift property to your spouse and they later sell it at a profit, that capital gain is attributed back to you and included in your income — not theirs. This capital gains attribution is unique to the spousal relationship; it does not apply to transfers to minor children, which creates a planning distinction worth noting.
The spousal attribution rules apply as long as the spouses are still married or in a common-law partnership at the time the income or gain arises. Attribution stops on separation or divorce. It also does not apply if the transferred property is acquired at fair market value (i.e., the spouse actually pays for it), or if a prescribed-rate loan structure is used, which is discussed below.
Attribution rules for transfers to children under 18 work somewhat differently from the spousal rules. Under section 74.1, if you transfer or loan property to a child who is under 18 at the time the income arises, any income — dividends, interest, rent — earned on that property is attributed back to you.
However, here is a meaningful distinction: capital gains on property transferred to minor children are not attributed back to the transferor. If you transfer shares or other capital property to a child under 18 and those shares appreciate in value, the capital gain when the shares are sold belongs to the child. This is a genuine planning opportunity, particularly for families looking to establish investment accounts for children that are oriented toward growth rather than income.
Attribution for minor children stops automatically when the child turns 18. From that point forward, income earned on the formerly attributed property is taxed in the child's hands — though TOSI rules (discussed below) may apply if the child is involved in a family business context.
The prescribed rate loan is the primary legitimate tool for achieving income splitting with a spouse or family member while navigating attribution rules. If you lend — not give — money to a family member at CRA's prescribed interest rate, and the loan is properly structured, the attribution rules do not apply.
The prescribed rate is set quarterly by CRA based on the Government of Canada 90-day Treasury bill rate. The current prescribed rate is 4%. Once a loan is established at a given rate, that rate is locked for the life of the loan — the rate does not increase if CRA raises the prescribed rate in a future quarter, which was a significant advantage during the period when prescribed rates were at 1% or 2%.
To make the exception work, several conditions must be met. The loan must be documented in writing. The borrowing family member must actually pay the interest by January 30 of each following year — not just accrue it, but physically pay it. If even one year's interest payment is missed, the attribution rules apply retroactively from that point forward.
Here is how the math works in practice. Suppose you lend $200,000 to your spouse at the prescribed rate of 4%. Your spouse invests the funds and earns an 8% return — $16,000 annually. Your spouse pays you $8,000 in interest (4% on $200,000), which is deductible to your spouse and included in your income. Your spouse keeps the remaining $8,000 in investment profit, which is taxed at their lower marginal rate. If your spouse's marginal rate is 30% and yours is 50%, the tax saving on that $8,000 is $1,600 annually — and it compounds as the portfolio grows.
This structure requires careful documentation and annual compliance. The Swift Accounting Calgary team works with clients regularly on prescribed-rate loan setups to ensure the paperwork is correct and the annual interest payments are tracked and processed on time.
The Tax on Split Income rules, commonly called TOSI, represent a separate but related set of provisions that target income splitting with adult family members in the context of a private corporation or family business. TOSI applies to individuals 18 and older who receive certain types of income — typically dividends or income from a partnership — from a business in which a related family member is significantly involved.
When TOSI applies, the income is taxed at the top marginal rate regardless of the recipient's actual income level, which eliminates the benefit of the split entirely. The rules are complex, with numerous exclusions for adults who are genuinely active in the business, family members over 65, and certain other situations.
TOSI planning requires professional analysis of each family member's role and the specific income flows involved. It is not an area to navigate without advice, as the consequences of getting it wrong are a tax bill calculated at the highest possible rate.
Attribution rules do not close every avenue for family tax planning. Several strategies operate entirely outside the attribution framework.
TFSA contributions for a spouse: You can give money to your spouse specifically for them to contribute to their TFSA. Because TFSA income is not taxable, attribution rules have nothing to attribute — the income simply does not appear on anyone's return. This is one of the cleanest income-splitting tools available.
Spousal RRSP: Contributing to a spousal RRSP shifts future retirement income to the lower-income spouse. Attribution applies only if the funds are withdrawn within three calendar years of any spousal RRSP contribution being made. Plan withdrawals carefully around this window.
Canada Child Benefit: The CCB is paid to the lower-income spouse by default and can be invested in the child's name without attribution concerns, as the funds originate from the government rather than from a transfer between family members.
Pension income splitting: Retirees with eligible pension income can allocate up to 50% of that income to their spouse for tax purposes through the pension income splitting election on their returns. No transfer of property is involved, so attribution rules do not apply.
For most families, a combination of these strategies — properly documented and reviewed annually — produces meaningful tax savings without triggering CRA's attribution provisions.
No. Attribution rules apply to investment income and capital gains from transferred property — not to reasonable salaries earned by a spouse who genuinely works in your business. Paying a spouse a reasonable wage for actual work performed is a separate matter governed by section 67 of the ITA, which requires the salary to be reasonable for the services rendered. CRA scrutinizes inflated wages between family members, but a legitimate salary for real work is not an attribution issue.
Yes, once a child turns 18, the attribution of income from transferred property stops. Going forward, income earned on those assets is taxed in their hands at their marginal rate. However, if they are involved in a family business, TOSI rules may now apply. The transition at age 18 is worth reviewing with an accountant to confirm the tax picture has shifted the way you expect.
Missing the annual interest deadline is a serious compliance failure. If your family member does not pay the required interest by January 30 of the following year, attribution applies from that point on — all income earned on the loaned funds is attributed back to you. CRA does not provide grace periods for this deadline. The loan does not automatically repair itself in future years; professional advice is needed to assess your options if a payment is missed.
Yes. Loans established now lock in at the current prescribed rate of 4% for the life of the loan. While 4% is higher than the historic lows of recent years, the structure still makes mathematical sense if your family member is in a significantly lower bracket and the expected investment return meaningfully exceeds the prescribed rate. A Swift Accounting Calgary advisor can model whether the spread justifies the structure given your specific income levels.
Attribution rules are among the more technical areas of Canadian personal tax law, and the consequences of misapplying them — or unknowingly triggering them through a well-intentioned family transfer — can be significant. Contact Swift Accounting to review your family's tax position and ensure any income-splitting strategies you are using are structured to withstand CRA scrutiny.
Free 30-Min Consultation · No Obligation
Our Calgary team handles personal tax, corporate returns, GST/HST, payroll, and bookkeeping — all under one roof.
Swift Ltd · Calgary, Alberta · swiftltd.ca