The 2018 TOSI rules closed several income-splitting doors for business owners and investors. But for families and employees, many powerful strategies remain fully intact — and largely unused. Here's a complete, honest rundown of what works, what doesn't, and how much each strategy actually saves.
Canada's progressive tax system means a family earning $180,000 from one spouse pays dramatically more tax than a family earning $90,000 each. Not slightly more — dramatically more. This gap is the entire reason income splitting strategies exist. For the CRA's explanation of how spousal income attribution rules work, see the CRA attribution rules guidance.
| Family Income Setup | Federal + Ontario Tax (2025, illustrative) | Difference |
|---|---|---|
| $180,000 — one spouse earns all | $57,840 | — |
| $90,000 + $90,000 — evenly split | $44,220 | Save $13,620/yr |
| $120,000 + $60,000 — partial split | $47,900 | Save $9,940/yr |
| $150,000 + $30,000 — minor split | $53,100 | Save $4,740/yr |
Illustrative estimates based on 2025 federal + Ontario provincial rates. Other provinces vary. Excludes credits and deductions. Not personalized tax advice — consult a licensed CPA.
A couple earning $180K as a single income pays $13,620 more in tax than a couple earning $90K each. Income splitting strategies aim to close that gap — legally.
Before 2018, business owners commonly paid dividends or business income to lower-income family members — even those who did little or no work in the business — to shift income into lower tax brackets. The 2018 TOSI rules ended this for most private corporation shareholders.
TOSI applies a flat 33% federal tax (the top marginal rate) to "split income" received by family members from a related business, unless a specific exemption applies. The exemptions are narrow: the family member must be actively involved in the business (20+ hours/week), have contributed capital at risk, or be over 65 and receiving pension income.
What TOSI does NOT affect: employment income, spousal RRSPs, pension splitting, TFSA income, or capital gains from personal investments. These remain fully available.
All strategies below are illustrative. Individual outcomes depend on income levels, province, account balances, and marital status. Consult a licensed advisor and CPA before implementing any income-splitting strategy. This article is educational only — not personalized tax advice.
Contribute to an RRSP in your spouse's name using your own contribution room. You get the tax deduction at your higher rate now. At retirement, they withdraw the funds at their lower rate. The result: income splitting without any business ownership or TOSI risk.
The 3-year rule: If your spouse withdraws from a spousal RRSP within 3 years of a contribution, the withdrawal is attributed back to you and taxed in your hands. Wait 3 years after the last contribution before withdrawing.
Retirees can elect to split up to 50% of eligible pension income with their spouse on their tax return — including RRIF withdrawals (after age 65), employer pension income, and annuity payments. This is the most powerful income-splitting tool available for retirees.
It's done entirely on the tax return — no actual transfer of funds required. The receiving spouse reports the income and may owe tax, but at their lower rate, saving the family net.
If you're self-employed or incorporated and your spouse performs genuine, documented work for the business, paying them a reasonable market salary is fully deductible and shifts income into their lower bracket. The salary must be reasonable for the work performed — CRA scrutinizes amounts that don't match market rates for the actual hours and duties performed.
This is distinct from TOSI — employment income paid to a family member for real work is not subject to TOSI. Keep time records and pay via payroll through a business account.
Give money to your spouse to contribute to their TFSA. Unlike non-registered accounts, investment income inside a TFSA is completely tax-free regardless of who originally provided the funds. Attribution rules do not apply to TFSA income.
If a higher earner gives $20,000 to a lower-earning spouse to invest in a TFSA that earns $1,400/year, that $1,400 is tax-free — versus the higher earner paying potentially $728 in tax on the same return in a non-registered account.
The higher-earning spouse loans money to the lower-earning spouse (or a family trust) at the CRA prescribed interest rate. The recipient invests the funds and pays investment returns — minus the loan interest — at their lower tax rate. The interest paid is deductible for the recipient and taxable (at the lower rate) for the lender.
2025 CRA prescribed rate: check CRA.gc.ca for the current quarter's rate. This strategy works best when rates are low and the investment return materially exceeds the prescribed rate. The rate is locked in at setup — it does not change for the life of the loan.
In certain structures, capital gains can be realized in the hands of a lower-earning spouse rather than a higher earner — particularly relevant for small business owners using the Lifetime Capital Gains Exemption (LCGE), which is $1,250,000 in 2025 for qualifying small business corporation shares (permanently increased as part of the 2024 federal budget).
For non-business investors, attribution rules generally prevent direct income shifting to spouses on gifted funds — but the prescribed rate loan structure above can enable this legally.
For completeness, here are the strategies that were common before 2018 and are now effectively shut down by TOSI for most families:
The Qualifying Small Business Corporation (QSBC) exemption, salary payments for legitimate work, and certain estate freeze structures remain powerful. The key post-2018 is documentation and ensuring family members are genuinely involved in the business at a reasonable compensation level. Consult a CPA with corporate tax experience for your specific structure.
Composite illustrative scenario — not a real client. Used to demonstrate how multiple strategies interact.
Ravi earns $120,000. His spouse Sunita earns $27,000 part-time. Without planning, the household pays an illustrative $41,200 in combined federal + Ontario tax.
With three strategies applied — spousal RRSP ($15,000 contribution), pension splitting modelled for retirement, and prescribed rate loan of $80,000 to Sunita's investment account — their effective household tax drops to an illustrative $34,800, a saving of $6,400/year.
Over 20 years to retirement, that's an illustrative $128,000 in tax savings. Individual results depend on actual marginal rates, investment returns, and specific circumstances. Consult a licensed advisor and CPA for projections based on your actual situation.
In a 45-minute session, we model your household income across all available splitting strategies and show you the illustrative dollar saving — before you commit to anything. Consult a CPA for the tax-filing specifics.
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