Income splitting — shifting income from a high-income family member to a lower-income one to reduce the family's overall tax bill — is a natural goal for many Canadian families. But the Income Tax Act contains a comprehensive set of income attribution rules designed to prevent abusive income splitting. Understanding these rules is essential before lending money to a spouse, transferring investments to a minor child, or setting up a family trust. Get the structure wrong, and the income comes back to you — taxed at your higher rate — as if the transfer never happened.
The Core Principle of Attribution
Attribution rules work by treating income earned on property transferred or loaned to certain related persons as if it were earned by the transferor. The income does not flow through back to you as a payment — it is simply attributed to you for tax purposes, while the actual recipient keeps the money. The effect is that you pay tax on income you did not receive, effectively nullifying the tax benefit of the transfer.
Spousal Attribution: ITA Section 74.1 and 74.2
Loans and Transfers to Spouses
If you transfer or loan property to your spouse or common-law partner (or to a trust for their benefit), and they use that property to earn income, that income is attributed back to you. This applies to:
- Income from property (interest, dividends, rent) earned on the transferred or loaned funds — attributed back under ITA s.74.1
- Capital gains and losses on the subsequent sale of transferred property — attributed back under ITA s.74.2
Attribution continues as long as you and your spouse remain a couple and the original property (or a substituted property) is still held. It stops if you separate and live apart because of a relationship breakdown.
The Prescribed Rate Loan Exception
You can avoid spousal attribution entirely by making a bona fide loan at CRA's prescribed interest rate in effect at the time the loan is made. The prescribed rate is set quarterly by CRA. For a loan made when the prescribed rate was 2%, for example, you must charge your spouse 2% interest — and they must actually pay it to you by January 30 of the following year — every year for the life of the loan.
The key advantage: if the loaned funds earn more than the prescribed rate, that excess income is taxed in your spouse's hands (at their lower rate), not attributed back to you. The prescribed rate is locked in at the time the loan is made, so loans made in low-rate environments can provide lasting income splitting benefits. Once the rate rises, new loans must use the new (higher) rate, but existing loans can retain the original lower rate.
Minor Child Attribution: ITA Section 74.1(2)
If you transfer or loan property to a minor child (under 18 at the end of the year), income earned on that property is attributed back to you. However, capital gains realized by minor children are not attributed back — only income (interest, dividends, rent). This creates a planning opportunity: transferring growth-oriented investments to minors can shift capital gains to the child's hands, where they are taxed at the child's (typically zero) rate.
Attribution to minors stops when the child turns 18. After that, income and gains are taxed in the child's hands without attribution — though the kiddie tax (TOSI) may apply if dividends are received from a private corporation.
The Tax on Split Income (TOSI) Rules: ITA Section 120.4
TOSI — sometimes called the "kiddie tax" — goes beyond simple attribution. It applies a flat tax at the top marginal rate to certain types of split income received by:
- Minor children (regardless of source)
- Adult family members under 25 who are not actively engaged in the business
- Adult family members of any age in some circumstances
Types of income subject to TOSI include dividends from private corporations, income from partnerships or trusts where the source is a related-party business, and gains on the sale of shares of a corporation. TOSI effectively eliminates the income splitting benefit on these amounts regardless of how they are structured.
There are excluded amounts — income that escapes TOSI — but the rules are detailed. Adult family members who are "reasonably contributing" to the business, family members over 65, and certain amounts from arm's-length sources may qualify for exclusions. Proper documentation of contributions is important.
Family Trusts and Attribution: ITA Section 74.4
Attribution rules also apply to certain transfers of property to trusts for the benefit of spouses or minor children. Additionally, ITA s.74.4 provides specific anti-avoidance rules for transfers of property to a corporation where a spouse or related minor child holds shares — aimed at preventing indirect income splitting through corporate structures.
A properly structured family trust can still be an effective income-splitting vehicle, but it requires careful attention to TOSI, the attribution rules, and 21-year deemed disposition rules. Family trusts are most useful for income splitting with adult children who are actively involved in the business and for multiplying access to the lifetime capital gains exemption on a business sale.
Re-Attribution: Avoiding Double Attribution
When income is attributed back to the transferor, it is not taxed again in the transferee's hands on the same amount. CRA's attribution mechanism ensures the income appears on only one return for tax purposes. However, the transferee may still have reporting obligations, particularly where a T3 trust return or T5 investment income slip is involved.
Practical Planning Within the Rules
There are legitimate ways to split income without triggering attribution:
- Prescribed rate loans to a spouse — charge the prescribed rate, document the loan agreement, and ensure interest is paid by January 30 each year
- Paying a reasonable salary to a family member who genuinely works in the business — wages paid at fair market value for actual services rendered are deductible and taxed in the recipient's hands
- Spousal RRSP contributions — contributions to a spousal RRSP reduce the contributing spouse's taxable income and, after a three-year holding period, withdrawals are taxed in the lower-income spouse's hands
- Capital gains splitting with adult children — transferring appreciated investments to adult children (not minors) is not subject to attribution (TOSI may still apply to dividends from private corporations)
At Swift Accounting Ltd. Calgary, we help families structure their investments and business ownership to maximize income splitting within the rules — avoiding costly attribution surprises at filing time.
Frequently Asked Questions
If I give my spouse money and they invest it, will the investment returns be attributed back to me?
Generally yes, if the gift or transfer is made directly to your spouse. Both income (interest, dividends, rent) and capital gains on transferred property are attributed back to the transferor under ITA sections 74.1 and 74.2. To avoid attribution, the transfer must be at fair market value, or a bona fide loan at the prescribed rate must be used.
Does attribution apply to capital gains earned by my minor child?
No — attribution of capital gains does not apply to minor children. Under ITA s.74.1(2), only income (not capital gains) earned on transferred property is attributed back when the transferee is a minor. However, the TOSI rules may apply to certain income earned by minors from family businesses or trusts.
What is the prescribed rate for spousal loans in 2025?
CRA sets the prescribed rate quarterly based on Government of Canada 90-day Treasury bill rates. For the exact current rate, check CRA's website or contact a tax professional. The critical point is that the rate in effect when the loan is made is locked in for the life of the loan — making loans made during low-rate environments particularly valuable for income splitting.
Can I pay my spouse a salary from my business to split income?
Yes — a reasonable salary paid to a spouse who genuinely works in the business is a legitimate income-splitting strategy and is not subject to attribution. The salary must be reasonable for the work actually performed (i.e., what you would pay an arm's-length employee for the same work) and must be actually paid. Unreasonable or fictional salaries will be disallowed by CRA.
The income attribution rules are technical, but navigating them correctly opens significant tax-saving opportunities for families. The team at Swift Accounting Ltd. Calgary can review your investment and business structure to identify legitimate income-splitting strategies and ensure your arrangements comply with the rules. Contact us today to schedule a tax planning consultation.