Lending Money Within the Family in Canada: Tax Rules and Legal Pitfalls

Lending money within the family feels like a private matter — a handshake between people who trust each other. But in Canada, the Income Tax Act has a lot to say about those arrangements. Whether you are helping a child with a down payment, transferring capital to a lower-income spouse for investing, or floating a sibling's small business, the Canada Revenue Agency (CRA) may be watching for opportunities to tax income that was shifted between family members.

Understanding the tax and legal considerations when lending money within the family in Canada does not require an accounting degree, but it does require knowing the right questions to ask before money changes hands. Getting the structure right at the start is far easier than unwinding a poorly documented loan years later — especially if CRA disagrees with how you characterized it.

This article walks through the key rules, common scenarios in Ontario, and the risks that accompany each approach. For the numbers — current prescribed interest rates, exact dollar thresholds — always confirm with CRA or a qualified accountant, as those figures change.

Is a Family Loan a Gift in CRA's Eyes?

The benefit: A true loan is not income. The borrower receives money they will repay, and the lender's capital is not permanently transferred. Done right, a family loan keeps the lender's estate intact and the borrower's tax footprint manageable.

The risk: CRA scrutinizes family loans because they are a classic vehicle for income-splitting — shifting income from a high-tax family member to a lower-tax one. If CRA concludes that a "loan" is really a disguised gift, it can apply the attribution rules under the Income Tax Act, which send any income or capital gain earned on the transferred funds back to the original transferor for tax purposes. The borrower used the money, but the lender pays the tax. That is a bad outcome for everyone.

CRA looks for indicia of a genuine commercial loan: documented terms, an intention to repay, and actual repayment behaviour. A verbal promise over dinner does not clear that bar.

Documenting the Loan: Why Paperwork Matters

The benefit: A written promissory note — signed, dated, stating the principal, interest rate (if any), repayment schedule, and what happens on default — is your first line of defence against CRA recharacterization. It shows intent. It creates a legal record. It also gives both parties clarity if the relationship sours.

The risk: Missing or sloppy documentation is the single most common reason a family loan gets recast as a gift. If there is no promissory note, no repayment schedule ever followed, and no interest paid, CRA has a strong argument that no real loan existed. Even well-meaning families sometimes skip paperwork because it feels cold — and then face a reassessment years later.

A lawyer can draft a promissory note that is enforceable in Ontario court and satisfies the kind of documentary record CRA expects to see. That is exactly the kind of legal structuring Treadstone Law handles.

Interest-Free Family Loans and Attribution Risk

The benefit: An interest-free loan keeps things simple. No cash interest changes hands between family members, and the borrower keeps more of whatever they earn on the borrowed funds.

The risk: Interest-free loans between spouses or common-law partners, or from a parent to a minor child, trigger attribution almost automatically under the Income Tax Act. Any income or taxable capital gain the borrower earns with the borrowed money is attributed back to the lender and taxed at the lender's (higher) marginal rate. The income-shifting goal is defeated entirely. With minor children, attribution applies to income earned on the funds. With spouses, it applies to both income and capital gains. Confirm the precise scope with your accountant, as the rules have nuances depending on the type of income generated.

Charging Interest: How Much Is Enough?

The benefit: Charging at least the CRA prescribed rate (set quarterly — confirm the current rate with CRA or an accountant before structuring a loan) and actually collecting that interest annually breaks attribution. The lender declares the interest income, but the borrower can deduct it as a cost of earning income, and any further returns belong to the borrower. The income-splitting works.

The risk: Two pitfalls lurk here. First, if you charge below the prescribed rate, attribution applies to the income earned on the shortfall — CRA does not give partial credit. Second, if you set the rate correctly but fail to collect interest each year before the deadline (generally January 30 of the following year), the entire structure can unravel retroactively. Collecting interest is not optional formality; it is a condition of the strategy working. This approach is sometimes called the prescribed rate loan strategy — a full treatment is beyond this article's scope, but it is worth a dedicated conversation with your accountant.

Common Scenarios in Ontario Families

Lending a Child Money for a Down Payment

Ontario's housing market means many first-time buyers rely on parental help. If you lend (not gift) your child money for a down payment, the character of that arrangement has real consequences.

The benefit: A formal loan preserves your estate — the money is expected to come back. It can also be coordinated with your child's First Home Savings Account (FHSA) strategy. A child who receives a documented parental loan still qualifies for the FHSA (the two are separate instruments), and the child can continue making FHSA contributions from their own income in parallel.

The risk: A documented loan counts as a liability on your child's mortgage application, which can reduce their borrowing capacity at the bank. Some lenders specifically require a "gift letter" stating that parental funds are not repayable — which changes the tax and legal character of the transfer entirely. Make sure your documentation matches reality. If the "loan" is never repaid and no interest is charged, CRA may treat it as a gift — which changes estate equalization among siblings and could raise fair market value questions on your death.

Lending Between Spouses for Investment

The benefit: A properly structured prescribed rate loan from a higher-income spouse to a lower-income spouse can meaningfully reduce the family's overall tax burden over time, since investment returns are taxed at the lower-income spouse's rate rather than the higher-income spouse's rate.

The risk: Attribution applies aggressively here. One missed interest payment, or an interest rate set below the prescribed rate at the time the loan was made, eliminates the benefit. The rate in effect when the loan is established is what governs — a rate that rises later does not help you, but a rate locked in at a low quarter can benefit you for years. This structure requires ongoing discipline. Get the paperwork right from day one and calendar the annual interest payment.

Lending to Adult Children for a Business

The benefit: A loan to an adult child's business can be structured to return capital to the parent while supporting the next generation's entrepreneurial goals. The attribution rules that apply so forcefully to spouses and minor children do not apply in the same way to loans to adult children, provided the loan is genuine.

The risk: CRA still looks at whether the arrangement is a real loan. If the "business loan" carries no interest, has no repayment terms, and is never pursued on default, it may be treated as an equity contribution — with different tax and legal consequences. There are also creditor priority issues: if the business fails, an informal family loan is typically last in line behind secured creditors. Consider whether a formal security interest — registered under Ontario's Personal Property Security Act — is appropriate to protect the lender.

What Happens If the Loan Is Forgiven?

The benefit: Sometimes life happens. A family member cannot repay, and the lender decides to forgive the debt. Forgiveness resolves the practical situation and can, in some cases, serve as a deliberate estate planning tool — effectively making a gift at a time and amount of the lender's choosing, rather than waiting for the estate to distribute.

The risk: Forgiven debt can trigger the debt forgiveness rules under the Income Tax Act. Depending on the borrower's circumstances, forgiveness may reduce the borrower's tax attributes (such as loss carryforwards or capital cost allowance pools) rather than generating income directly — but the exact impact depends on the borrower's specific situation. In some cases, forgiveness can produce income in the borrower's hands. This is not a simple outcome and is worth reviewing with an accountant before you forgive, not after.

Family Loans vs. Gifts: Choosing the Right Approach

Loans work better when: you want the capital back, you are managing estate equalization among multiple children, or you are deliberately pursuing income-splitting using the prescribed rate loan structure.

Gifts work better when: you have no real expectation of repayment, you want to simplify estate planning by distributing assets now, or the amounts are modest and the administrative burden of maintaining a formal loan structure outweighs the tax benefit.

The risk with getting this wrong: treating something as a loan when it functions as a gift (no repayment, no interest, no documentation) exposes you to attribution, potential estate disputes among beneficiaries, and CRA reassessment. Treating something as a gift when it was intended to be a loan means you may have no legal recourse if the relationship changes.

The Limitation Period: When Does a Debt Expire?

In Ontario, the right to sue to enforce a debt — including a promissory note — is subject to limitation periods. The general rule under the Ontario Limitations Act imposes a two-year window from the date you discovered (or ought to have discovered) the claim, with an ultimate limitation of fifteen years. However, the rules around demand loans, acknowledgement of debt, and part-payment can extend or restart those clocks in ways that are not always intuitive.

A long-standing practical concern in family loan situations is that a debt left completely inactive for many years can become difficult or impossible to enforce in court. Many practitioners reference a general concept of approximately seven years as a commonly discussed window for informal family debts, but you should confirm the current limitation period with a lawyer before relying on that figure — limitation law in Ontario has evolved, and your specific loan terms affect how the period runs.

A properly documented loan with ongoing acknowledgements — such as annual interest payments or written acknowledgement of the balance — keeps the limitation clock in check and preserves the lender's options.