Income Splitting Strategies in Canada (and TOSI Limits)

Income splitting is the practice of shifting taxable income from a family member in a high tax bracket to one in a lower bracket, so the household pays less tax overall. It works because Canada taxes individuals, not families, on a rising scale: a dollar of income taxed at a low rate in one spouse’s hands costs the household far less than the same dollar taxed at a top rate in the other’s. The challenge is that the Canada Revenue Agency has long anticipated this, and the rules that police it have tightened considerably.

This guide is for couples, families, retirees, and business owners in Ottawa and across Canada who want to understand which splitting strategies still work, which no longer do, and where the limits sit. It is an overview, not advice for your situation; confirm any arrangement with your accountant before relying on it.

Why income splitting works

Because tax rates climb as income rises, two households with identical total income can pay very different tax depending on how that income is divided between the partners. A couple where one person earns everything and the other earns nothing generally pays more than a couple splitting the same total evenly, because the single earner climbs into higher brackets while the other’s low brackets go unused.

Understanding this comes back to your marginal rate, the tax on your next dollar. Our note on marginal vs. average tax rate explains why moving income from a high marginal rate to a low one is where the saving comes from. The strategies below are simply different, legal ways to accomplish that shift.

The two rules that limit everything

Before the strategies, it helps to know the two gatekeepers.

The attribution rules generally prevent simple gifting from moving investment income to a lower bracket. If you give your spouse money to invest, the investment income is usually taxed back in your hands. Gifts to minor children face similar treatment on income, though capital gains are treated differently.

The tax-on-split-income (TOSI) rules target private-corporation income. They apply the top marginal rate to dividends and certain other amounts paid to family members unless the recipient meets a specific exclusion. Common exclusions include being a spouse of an owner aged 65 or older, working in the business an average of at least 20 hours a week, or meeting age and share-ownership tests. TOSI is why the casual dividend sprinkling of a decade ago no longer works.

The legitimate tools that still work

Several splitting tools remain available and widely used. The first is the spousal RRSP. A spousal RRSP lets a higher-earning spouse contribute to a plan owned by the lower-income spouse. The contributor takes the deduction now; the lower-income spouse eventually withdraws the funds, taxed in their lower bracket. It is a clean way to equalise retirement income between partners, particularly where one spouse will have a much smaller pension or RRSP of their own. Our dedicated guide, spousal RRSPs explained, covers the attribution timing rules that apply to withdrawals.

For retired couples, pension income splitting is the simplest and most reliable tool of all. It is an election made on your tax return that lets you allocate up to half of eligible pension income to your spouse. It is not caught by TOSI, requires no restructuring, and can also preserve credits and reduce exposure to the OAS clawback. Our article on pension income splitting walks through which income qualifies and how the election is made.

The prescribed-rate loan is one of the few durable ways to split investment income around the attribution rules. Instead of gifting money to a lower-income spouse, the higher earner lends it at the CRA’s prescribed interest rate, locked in for the life of the loan. The lower-income spouse invests the funds, pays the annual interest to the lender by the deadline, and keeps all growth above that rate, taxed in their lower bracket. Our note on the prescribed-rate loan strategy explains the documentation required. The strategy is most attractive when prescribed rates are low, and the paperwork must be exact.

A business owner can pay a family member a reasonable salary for work they actually perform. Reasonable means what you would pay an arm’s-length employee for the same job. Paid properly, salary is deductible to the business, builds RRSP room for the family member, and is not caught by TOSI because it is employment income for real work, not a dividend. The caution is that the work and the amount must be genuine and defensible, with records to match. For incorporated owners this sits inside the broader subject of how to reduce taxes as a business owner.

What no longer works well

It is as important to know what to avoid:

• Sprinkling dividends to non-active adult children or a non-working spouse is generally caught by TOSI and taxed at the top rate.
• Simply gifting investment funds to a spouse triggers attribution, so the income returns to you.
• Paying a family member more than the work is worth is not deductible and invites reassessment.

A simplified illustration

The table below is an illustrative, hypothetical example comparing a household’s combined tax where income is concentrated versus split. Figures are rounded, assume mid-range rates, and are not a forecast; your result depends on your province and circumstances.

Scenario	Spouse A income	Spouse B income	Illustrative combined tax
No splitting	$160,000	$0	Highest
Pension splitting in retirement	$100,000	$60,000	Lower
Prescribed-rate loan shifts investment income	$140,000	$20,000	Lower still, on the investment portion

The point is the direction, not the exact dollars: moving income from a high bracket to an unused low bracket reduces the household total. How much depends on the gap between the partners’ rates.

Coordinating splitting with the whole plan

Income splitting is most valuable when it is planned years ahead rather than discovered at tax time. Equalising retirement income between spouses, for example, is far easier if spousal RRSP contributions and account ownership were arranged during the working years. That is why splitting belongs inside your broader tax planning and retirement planning, not treated as a last-minute adjustment.

For couples specifically, our guide to financial planning for couples covers how to structure ownership and savings so splitting options are available when you need them.

Splitting with minor children and the family

Parents sometimes hope to shift investment income to children in lower brackets. The rules make this difficult. Income earned on money given to a minor child is generally attributed back to the parent, and the TOSI rules treat most private-corporation income paid to a minor as taxed at the top rate. There are narrow exceptions: capital gains on gifted funds are generally not attributed to a parent, and contributions to a child’s registered education savings plan attract the Canada Education Savings Grant, which is its own form of family tax efficiency, covered in RESP government grants and the CESG.

For adult children the picture is slightly broader but still constrained. Paying a reasonable salary for genuine work in a family business remains available, and adult children who meet a TOSI exclusion, such as working the required hours, can receive dividends without the top-rate treatment. The common error is assuming adulthood alone unlocks free splitting; it does not.

It helps to understand why this area is so restricted. For years, incorporated professionals and business owners could sprinkle dividends to family members in low brackets, producing large household savings with little economic substance. The TOSI rules were introduced to curb that practice, drawing a line between genuine family participation in a business and arrangements designed only to move income. The result is that splitting now rewards real substance: actual work, genuine ownership tied to meaningful involvement, or the structural tools such as spousal RRSPs and prescribed-rate loans that Parliament still sanctions. Keeping clean records of hours worked and roles held is now part of any defensible splitting plan.

Next step

Income splitting can meaningfully lower a household’s lifetime tax, but the rules are detailed and the penalties for getting them wrong are real. If you would like a considered review of which strategies fit your family, structured correctly and confirmed with your accountant, book a private consultation with Kevin Hayes Financial Services.