Back to work in September? What the second income is actually worth after daycare
Between tax, clawed-back benefits, and child-care fees, a second salary can shrink to a fraction of its sticker price. Here's how to run the real math before the school year starts.
September is when a lot of households flip from one income to two: parental leave ends, a child starts daycare or school, and someone goes back to work. The offer letter says one number. The family's bank account will see a much smaller one — and it's worth knowing how much smaller before committing to the commute and the daycare waitlist.
A second salary gets taxed and clawed back from the first dollar, then has to pay for the costs that only exist because both parents work. Three deductions do most of the damage.
1. Tax — at the household's marginal rate
The second earner's income stacks on top of nothing, so it starts in the lowest bracket — that part is fine. The real drag is what it does around the paycheque: CPP, EI, and any pension contributions come off the top too. Your take-home pay at the offer salary is the starting point, not the offer itself.
2. Clawed-back benefits
Income-tested benefits are calculated on family net income, so a second salary doesn't just get taxed — it also shrinks the Canada Child Benefit and credits like the new Groceries and Essentials Benefit. For a family in the CCB phase-out range, each extra dollar of income can quietly remove several cents of benefit on top of the tax. It's an invisible surtax on the second income specifically.
3. Child care — cheaper than 2020, not $10 yet
The good news: under the national child-care agreements, fees have fallen by up to half compared with 2020. The asterisk: the $10-a-day target hasn't landed everywhere. Ontario, for example, caps licensed under-6 fees in participating programs at $22/day, families are paying roughly $19/day on average, and the province's extended plan aims for a $12/day maximum by the end of 2026.
At $19/day, one child in full-time licensed care runs about $400 a month — roughly $4,800 a year, paid from after-tax dollars. Two kids, or a spot outside the subsidized system at $60–$90/day, changes the math completely.
The question isn't "is the salary good?" — it's "what does the last dollar of this salary buy the household, after tax, clawbacks, and care?"
What the math usually shows
Run honestly, the second income is worth keeping far more often than not — but its first-year value is routinely 30–50% below the sticker price once tax, benefit clawbacks, care, commuting and work costs are netted out. And the long game matters: staying attached to the workforce protects future raises, CPP contributions, and pension years that a one-year snapshot ignores.
The second income calculator does this arithmetic for your province, salary, and child-care costs in one pass — including the benefit clawbacks that are nearly impossible to eyeball.
The takeaway
Don't judge a return-to-work offer by the salary line. Net it down: tax and payroll deductions, then lost benefits, then care costs that only exist because of the job. The remaining number — plus the career and pension upside — is what you're actually deciding on.