Family Tax Planning: How to Reduce Your Household Tax Bill Legally

Canada taxes individuals, not households. That means a family where one spouse earns $200,000 and the other earns $0 pays dramatically more tax than a family where both earn $100,000 - even though the household income is identical. Family tax planning is the deliberate process of legally moving income, credits, and deductions across the household to flatten that disparity and minimize the CRA’s share of your hard-earned wealth.

The bracket math you’re working against

The Canadian tax system is progressive, meaning the next dollar you earn is taxed at a higher rate than the first. In Ontario, the combined marginal rates (federal + provincial) escalate quickly.

Every bracket you can keep a spouse out of is worth ~10–15 cents per dollar moved. If Spouse A is in the 53.53% bracket and Spouse B is in the 20.05% bracket, shifting $10,000 of income from A to B saves the family over $3,300 in cold, hard cash.

1. Spousal RRSPs: The Arbitrage Play

The higher-earning spouse contributes to an RRSP in the name of the lower-earning spouse. The contributor gets the deduction at their high marginal rate (say, 48%); in retirement, the lower-earning spouse withdraws the funds and is taxed at their likely lower rate (say, 20%).

### Numerical Example: Spousal RRSP Benefit

• Spouse A Income: $220,000 (Marginal Rate: 48.29%)
• Spouse B Income: $45,000 (Marginal Rate: 20.05%)
• Action: Spouse A contributes $10,000 to Spouse B’s Spousal RRSP.
• Immediate Tax Refund: $4,829 (goes to Spouse A).
• Future Withdrawal: If Spouse B withdraws the $10,000 in retirement while in the bottom bracket, they pay ~$2,005 in tax.
• Net Family Gain: $2,824 in tax savings purely from shifting who claims the income.

2. Prescribed rate loans

For households with significant non-registered investment capital, a prescribed rate loan moves investment income from the high-bracket spouse to the low-bracket spouse legally and durably. This bypasses the "attribution rules" that normally prevent you from just giving money to a spouse to invest.

How it works:

1. 01The high-income spouse loans capital to the low-income spouse (or a family trust).
2. 02The loan documents the CRA prescribed rate at the date of the loan - that rate is locked for the life of the loan.
3. 03The low-income spouse invests the capital and pays tax on the returns at their low bracket.
4. 04The low-income spouse pays the prescribed interest to the high-income spouse by January 30 each year.

3. Pension income splitting

Once one spouse receives eligible pension income (a defined-benefit pension at any age, or RRIF withdrawals after 65), they can elect to allocate up to 50% to their spouse for tax purposes on Form T1032.

This single election is one of the most powerful tools for seniors. It can:

• Equalize retirement income overnight to keep both spouses in lower brackets.
• Prevent the OAS clawback (which starts at roughly $93,500 for 2026).
• Unlock a second $2,000 pension income amount credit and potentially a second age amount credit.

4. TFSA, FHSA, RESP, and the family credit pile

5. Stack medical and donation credits

The CRA allows spouses to combine certain credits on one return to maximize the tax benefit.

### Numerical Example: Medical Expense Optimization

• Household Income: Spouse A ($150,000), Spouse B ($40,000).
• Medical Expenses: $4,000.
• Spouse A Floor: 3% of $150k = $4,500. Result: $0 claimable (expenses are below the floor).
• Spouse B Floor: 3% of $40k = $1,200. Result: $2,800 claimable.
• Family Savings: By moving the expenses to Spouse B, the family gets a tax credit on $2,800 that would otherwise be wasted.

6. Pay your spouse (legally) if they work in your business

A spouse who genuinely works in the family business can be paid a reasonable salary for actual duties performed - invoicing, bookkeeping, scheduling, marketing. Document the role, the hours, and pay them through payroll like any other employee.

### Step-by-Step Salary Calculation

1. 01Determine Market Rate: What would you pay a stranger to do the same task? (e.g., $25/hour for bookkeeping).
2. 02Track Hours: Keep a simple log of hours worked per month.
3. 03Issue T4: Pay the salary, withhold CPP/EI (if applicable), and issue a T4 at year-end.
4. 04Deduct: The business deducts the salary, and the spouse reports it at their (presumably) lower tax rate.

Family planning is rarely about one big move. It’s the compounding effect of equalizing income across spouses, year after year, while keeping all of it within the four corners of CRA-approved mechanics. If you’re ready to optimize your family’s tax footprint, let’s talk about building a multi-year strategy.