Case Studies
Case Study: Impact of Bill C-4 for a Two-Income Household
Exploring how the affordability measures, tax rate change, and CGEB top-up affect a middle-class two-income family with children.
By NomadicTax Research Team • 5-8 min read • July 5, 2026
## Family Profile
**Parents**: Two working adults, income combined $90,000 annually (one earning $60,000; the other $30,000). Two children under age 18.
**Household in Ontario** for simplicity (provincial rates as 2026 in Ontario apply in addition to federal rates) ([canada.ca](https://www.canada.ca/en/revenue-agency/services/tax/individuals/tax-rates-brackets/current-year.html?utm_source=openai)).
## Before vs After: Key Changes From Bill C-4 + CGEB
| Policy | Before July 1, 2025 / Before CGEB | After (2026 and beyond) |
|--------|-------------------------------|---------------------------|
| Federal tax rate on first \$58,523 of income | 15% | **14%** for all persons ([canada.ca](https://www.canada.ca/en/department-finance/services/publications/report-impact-reducing-lowest-marginal-personal-income-tax-rate-non-refundable-tax-credits.html?utm_source=openai)) |
| GST/HST credit | Old benefit based on previous structure | Replaced by CGEB in July 2026 with **higher payments** plus one-time top-up in June ([canada.ca](https://www.canada.ca/en/revenue-agency/services/child-family-benefits/gst-hst-credit.html?utm_source=openai)) |
| One-time payment (June 5, 2026) | Not applicable | Approx. **50% of annual GST/HST credit** benefit amount for year July 2025-June 2026 ([canada.ca](https://www.canada.ca/en/revenue-agency/services/child-family-benefits/gst-hst-credit/how-much/one-time-top-up.html?utm_source=openai)) |
## Numerical Example
- **Federal Income Tax Savings**:
- In 2025, first \$58,523 taxed at **15%** → \$8,778.45 in federal tax on that portion.
- In 2026, same portion taxed at **14%** → \$8,193.22.
- **Savings** = \$585.23 annually just from that bracket.
- **CGEB Benefit**:
- Assume net income \$90,000: qualifies for CGEB. Under old GST/HST credit may have received say \$600 annually (estimate). Under CGEB, the family of four could receive **up to \$1,890 in 2026** including top-up. This implies a **significant increase** in benefit over old credit structure. ([canada.ca](https://www.canada.ca/en/revenue-agency/news/2026/04/canada-groceries-and-essentials-benefit-one-time-top-up-payment-to-make-groceries-and-other-essentials-more-affordable-is-coming-june-5.html?utm_source=openai)).
## Combined Effect on Household Budget
- **Lower taxes** mostly benefit the spouse with lower income, as more of combined income is taxed at a lower rate.
- **Higher benefit payments** (CGEB + top-up) add cash flow relief in summer and going into each quarter thereafter.
- These measures may reduce the impact of inflation on essentials, especially groceries and household expenses.
## Take-Action Recommendations
- Ensure family files both **2024 and 2025 tax returns** to qualify and correctly calculate benefits. Missing a filing could mean loss of top-up or future CGEB payments.
- Adjust payroll withholdings or instalments (if self-employed) to reflect lower rate — avoid overwithholding and improve cash flow throughout the year.
- Plan any large deductible expenditures (medical, charitable) to leverage non-refundable credits now that their rate of return is 14% instead of 15%.
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This case illustrates how a middle-class two-income household will benefit from the combined effect of Bill C-4 and the CGEB, noticeably in tax savings and benefits that help with growing cost pressures.