Canada's marginal tax system means the first dollars you earn are taxed at a low rate, and additional income is taxed at progressively higher rates. In a household where one partner earns significantly more than the other, shifting income to the lower-earning partner — legally — can reduce the total tax paid by the household substantially.
Why income splitting reduces tax
Consider a household with $150,000 of combined income:
| Scenario | Income distribution | Estimated combined federal tax |
|---|---|---|
| No splitting | $150,000 / $0 | ~$38,000 federal tax |
| Moderate splitting | $100,000 / $50,000 | ~$29,000 federal tax |
| Equal splitting | $75,000 / $75,000 | ~$26,000 federal tax |
The potential savings of $10,000–$12,000+ per year in federal tax alone (before provincial tax) illustrates why income splitting is one of the highest-priority tax planning strategies for households with income disparity.
Spousal RRSP contributions
A spousal RRSP allows the higher-earning spouse to contribute to an RRSP in the lower-earning spouse's name. The contributor gets the tax deduction (at their higher marginal rate), but withdrawals in retirement come out in the lower-earning spouse's hands — at their lower tax rate.
- Contributions use the contributor's RRSP room (not the spouse's)
- Withdrawals are attributed back to the contributor if made within 3 calendar years of the last contribution — the attribution rule must be understood to use this strategy correctly
- Most effective when there's a large projected income gap in retirement — one partner has a pension, the other doesn't, for example
- Can be combined with RRIF income splitting later for additional flexibility
Pension income splitting
Canadian tax law allows couples to split up to 50% of eligible pension income on their tax returns. This is one of the most powerful and simplest income splitting tools available — it requires no planning in advance, just the right elections at tax time.
- Eligible pension income includes: defined benefit pension payments, RRIF withdrawals (if the annuitant is 65+), and annuity payments from an RRSP
- CPP income cannot be split on the tax return (it has its own separate 'CPP sharing' mechanism)
- Both partners claim the pension income credit — doubling the credit value at virtually no cost
- The lower-earning spouse's income increases, but at a lower marginal rate than it would cost the higher earner to keep it
TFSA gifts to spouses
Unlike registered accounts, TFSA contributions made using money gifted from a higher-earning spouse to a lower-earning spouse do not trigger attribution rules. This means:
- You can gift money to your spouse to contribute to their TFSA
- Investment income and growth inside the TFSA is completely tax-free — attribution does not apply
- In retirement, the lower-earning spouse can draw from a larger TFSA, further equalizing income
- This strategy is simple, legal, and frequently overlooked
Family business income splitting
Incorporated business owners have historically had significant income splitting opportunities through salaries or dividends paid to family members. Note: The Tax on Split Income (TOSI) rules introduced in 2018 significantly limited this for adult family members — it's essential to get professional advice before implementing any family income splitting through a corporation.
- Paying a reasonable salary to a spouse who genuinely works in the business remains valid
- Dividends to adult family members who are significant contributors to the business may qualify
- Family trusts can be used in some circumstances — requires careful planning and professional advice
- Always document contributions of family members to justify any income allocated to them
Carrie's approach: Income splitting is most powerful when planned years in advance — especially spousal RRSP contributions, which require contributions well before retirement. If there's a significant income gap in your household, let's review your options to make sure you're not overpaying.
Carrie Wang
Carrie is the founder of Seven Lakes Financial Services Inc. and a Sun Life advisor serving clients across Ontario and Saskatchewan. She specializes in retirement, estate, and investment planning, with a warm, personalized approach. She is fluent in English, Mandarin, and Taiwanese.