The 3% Trick: How High-Income Canadian Families Legally Pay Less Tax On Investment Income
If you are a high-income earner in Canada with after-tax savings sitting in a non-registered investment account, you are likely paying over 53% tax on every dollar of interest income you earn in Ontario. Meanwhile, your children may have no income at all and can earn over $15,000 before paying a cent in tax.
That gap between your tax rate and your children's tax rate is not just frustrating. It is an opportunity. And there is a strategy built directly into the Income Tax Act that lets you take advantage of it.
It is called a prescribed rate loan to a family trust. And it costs you 3%.
How It Works
The strategy has three components. First, you set up a family trust with your children as beneficiaries. A tax advisor and a lawyer handles this. Second, you loan your after-tax savings to the trust at the CRA prescribed interest rate, which is currently 3% for Q2 2026. Third, the trust invests those funds and earns a return. After paying you the 3% interest, the remaining income is distributed to your children, who pay tax at their own much lower rates.
The critical detail is that this must be a loan, not a gift. If you gift money to a trust for your minor children, CRA's attribution rules cause all the income to be taxed in your hands. But if you charge interest at the prescribed rate, those attribution rules do not apply. And once the loan is established at 3%, that rate is locked in for the life of the loan, even if the prescribed rate increases in the future.
This is how many high-income families fund private school tuition, tutoring, sports programs, and other expenses. Instead of paying for these with after-tax dollars taxed at 53%, the income flows through a trust structure and is taxed at close to nothing.
The Numbers: What Does This Actually Save?
We built a detailed model to quantify the savings across different investment types and loan amounts. Here is what the numbers look like for a $500,000 loan at an 8% annual return in Ontario.
Without a trust, you invest the $500,000 directly. On $40,000 of interest income at a 53.53% combined rate, you pay approximately $21,400 in tax. Your family keeps about $18,600.
With the trust structure, the trust earns the same $40,000 but pays you $15,000 in interest (the 3% prescribed rate). You pay about $8,000 in tax on that interest. The remaining $25,000 is distributed to two children at $12,500 each, well under the basic personal amount. Their tax: approximately zero.
The result: your family keeps approximately $30,400 instead of $18,600. That is almost $12,000 more per year. Over 10 years, that is nearly $120,000 in cumulative tax savings on the same investment.
The New AMT Rules Change Everything
For years, this strategy worked cleanly across virtually all investment types. But the 2024 amendments to the alternative minimum tax rules have introduced a significant complication.
Under the new AMT regime, trusts face a separate minimum tax calculation. The AMT rate for trusts is 20.5%, and critically, inter vivos family trusts receive no AMT exemption. The $173,000 basic exemption that applies to individuals does not apply to regular family trusts.
Two specific AMT adjustment impact this strategy. First, only 50% of the interest paid by the trust (the carrying charges) is deductible for AMT purposes. This means even though the trust distributes all its net income, AMT may still apply on the disallowed portion. For interest income, this creates a manageable cost of roughly $1,500 on a $500,000 loan.
Second, capital gains are included at 100% for AMT purposes at the trust level, compared to the regular 50% inclusion rate. This is the critical finding: on a $500,000 loan invested entirely in capital gains generating assets, the trust strategy actually costs the family over $5,200 more per year than simply investing directly. The strategy does not just fail. It backfires.
Which Investments Work And Which Do Not
Based on our modelling for a $500,000 prescribed rate loan at 8% in Ontario:
Interest income: saves approximately $11,845 per year. The strategy works as designed.
Eligible dividends: saves approximately $6,161 per year. Still beneficial, but the gap is smaller because the personal dividend tax rate is already lower.
Capital gains: loses approximately $5,240 per year. The 100% AMT inclusion makes the strategy counterproductive.
Blended portfolio (40% interest, 30% dividends, 30% capital gains): saves approximately $5,322 per year. Worthwhile, but significantly less than the pure interest scenario.
The type of income inside the trust is not a minor implementation detail. It determines whether the strategy saves your family money or costs you money.
The January 30th Rule
There is one compliance requirement that cannot be missed. The trust must actually pay the prescribed rate interest to you within 30 days of the trust's year-end. For most calendar-year trusts, that deadline is January 30th.
This is not an accrual. It is not a journal entry. It is a real payment, documented with a paper trail, from the trust's bank account to yours. If the payment is missed by even one day, all income distributed to the children is attributed back to you, not only for the current year, but for every year going forward until the loan is repaid. The entire structure collapses.
Who Should Consider This Strategy
This strategy is most effective for families with at least $200,000 to $300,000 in after-tax savings, minor children or other low-income beneficiaries, and an investment portfolio weighted toward interest-bearing or dividend-paying investments rather than capital gains. You should also be prepared to maintain the structure properly: a drafted trust agreement, a documented loan, annual trust tax returns, distribution resolutions, and the January 30th interest payment without fail.
This is not a loophole. It is a strategy built into the Income Tax Act under section 74.5. CRA knows about it. They expect taxpayers to use it. But it requires proper implementation and, with the new AMT rules, careful modelling before committing.