Most incorporated physicians and dentists assume that passing wealth to their children tax-efficiently means waiting for an estate freeze, a will, or a large one-time gift late in life. But there’s a structure available right now — while you’re still building your practice and your holding company — that can start shifting future investment growth to your children’s hands each year, without triggering the income attribution rules that normally punish family income splitting.
It’s called a prescribed rate loan, and paired correctly with a family trust, it’s one of the more underused tools in a Canadian medical professional’s tax planning toolkit.
Why Simply Gifting Money to Your Kids Backfires
If you gift cash or investments directly to a minor child, or even an adult child who doesn’t truly control the funds, the Income Tax Act’s attribution rules generally pull any investment income earned right back onto your personal return. You’ve moved the capital, but not the tax bill. This is precisely why so many incorporated professionals give up on income splitting with family altogether — the naive version simply doesn’t work.
What a Prescribed Rate Loan Actually Does
A prescribed rate loan sidesteps attribution by structuring the transfer as a genuine loan rather than a gift. You (or your corporation) lend funds to a lower-income family member — often a spouse, or a family trust for the benefit of your children — at the CRA’s prescribed interest rate, which is locked in for the life of the loan at the rate in effect when the loan is signed.
The borrower invests the loaned funds, pays you the prescribed rate of interest annually (by January 30 of the following year, without exception), and keeps any investment return above that interest cost. You report the interest received as income; the borrower deducts the interest paid and reports the investment income and growth in their own, typically lower, tax bracket.
Why this matters for incorporated professionals specifically:
- Physicians and dentists frequently have surplus retained earnings sitting inside a holding company earning passive income that erodes the small business deduction — funds that could instead be lent out and start compounding in a lower-taxed hand.
- The loan can be structured from your holding company directly to a family trust, which then allocates investment income annually to adult beneficiaries (typically adult children) in their own tax brackets.
- Because the rate is locked at signing, a loan set up when the prescribed rate is low can remain advantageous for years, even if rates rise later — timing the initial loan matters more than most professionals realize.
Why a Family Trust Is Usually the Right Vehicle
Lending directly to a minor child doesn’t work well — minors can’t legally manage investment accounts or loan obligations, and income allocated to a minor from a trust is often still subject to the “kiddie tax” if it’s not earned appropriately. A discretionary family trust solves this:
- The trust borrows the funds and invests them.
- Each year, the trustees decide how much income and capital gains to allocate to which beneficiaries, based on each child’s own tax situation.
- Once a beneficiary turns 18 and the income is genuinely paid or made payable to them, ordinary graduated tax rates typically apply rather than the top marginal rate — provided the income isn’t caught by the Tax on Split Income (TOSI) rules.
Where TOSI and Professional Corporation Rules Intersect
TOSI can apply to dividends or income sprinkled to family members from a business the professional is “actively engaged in” — this is exactly why professional corporation share structures are so tightly regulated by provincial colleges in the first place. A prescribed rate loan strategy is generally structured to fall outside TOSI because the return the family member earns comes from their own invested capital and their own investment decisions, not from dividends flowing out of the practice itself. That said, TOSI’s exceptions are fact-specific, and the loan documentation, trust deed, and annual interest payments all need to be handled with precision — this is not a strategy to set up informally between family members.
A Research-Backed Note on What Gets Invested
Once the funds are inside the trust, how they’re invested matters as much as the structure itself. It’s tempting for physicians to steer family trust dollars toward pharmaceutical or biotech names they feel they understand from clinical practice. Decades of empirical asset-pricing research — most notably Eugene Fama’s work on market efficiency — consistently shows that concentrated stock-picking, even by well-informed insiders, does not reliably beat a broadly diversified portfolio once risk and costs are factored in. A globally diversified, low-cost portfolio built around established, compensated risk factors tends to be the more durable home for a family trust’s long-term capital than a handful of familiar-sounding tickers.
The Bottom Line
A prescribed rate loan strategy, layered with a properly drafted family trust, lets incorporated doctors and dentists start moving future investment growth to the next generation years — sometimes decades — before an estate freeze or inheritance ever comes into play. Done correctly, it’s one of the more powerful, CRA-sanctioned ways to pass wealth to kids tax-free while you’re still actively building your practice.
Curious whether a prescribed rate loan or family trust fits your corporate structure? Book a private consultation with the team at financialadvise.ca or call at 587 718 8001 and let’s map out a tax-efficient path for passing wealth to the next generation.
This content is for general information purposes only and is not tax, legal, or financial advice. Consult a qualified professional before acting on any strategy discussed.
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