The Canada Child Benefit and the Ontario Child Benefit: How Yours Is Calculated

For a lot of households in Ottawa, the Canada Child Benefit is the largest single payment they receive from any government, and almost nobody can explain why theirs is the amount it is. The payment arrives, it changes in July, and occasionally it drops by a few hundred dollars a month with no letter that explains the mechanism.

The mechanism is not complicated. It is a maximum amount per child, reduced by a percentage of your income above two thresholds, with the percentage set by how many children you have. Once you can do that arithmetic, you can predict your own payment and you can see exactly what a raise, a bonus or an RRSP contribution does to it.

The three inputs

The CRA calculates the Canada Child Benefit from three things only: the number of children in your care, their ages, and your adjusted family net income (AFNI) from the previous year’s return. The benefit is not taxable and is not reported on your return.

AFNI is your family net income (line 23600 on both spouses’ returns) minus any Universal Child Care Benefit and registered disability savings plan income received, plus any of those amounts repaid. For most families it is simply the two line 23600 figures added together.

Two consequences follow immediately. First, the payment you receive between July 2026 and June 2027 is based on your 2025 income, so an income change shows up a year later than people expect. Second, anything that reduces line 23600, an RRSP contribution being the obvious one, increases next year’s benefit as well as cutting this year’s tax.

The maximums and the two thresholds

For the July 2026 to June 2027 benefit year, the CRA’s how much you can get page sets the maximum at $8,157 per year for each child under 6 and $6,883 per year for each child aged 6 to 17. The full amount is paid where AFNI is under $38,237. Above that, two reduction bands apply, and the rates depend on the number of eligible children.

These amounts and thresholds are indexed every July, so confirm the current figures on the CRA page before you plan around them.

Doing the arithmetic yourself

Take a couple with two children, one aged 4 and one aged 9, and an AFNI of $95,000. The maximum is $8,157 plus $6,883, which is $15,040. Because AFNI is above the second threshold and there are two children, the reduction is $6,022 plus 5.7 percent of the excess over $82,847.

The excess is $12,153. At 5.7 percent that is $692.72, so the total reduction is $6,714.72 and the annual benefit is $8,325.28, or roughly $693.77 a month.

The useful number to pull out of that calculation is the marginal one. With two children in the upper band, every extra dollar of family income costs 5.7 cents of CCB. Between the thresholds it costs 13.5 cents. That sits on top of your ordinary marginal tax rate and on top of any other income-tested benefit, which is why an income-splitting or RRSP decision made only on the tax rate can be badly wrong. The same logic drives the attribution rules and family income splitting.

The Ontario Child Benefit rides along

Ontario runs its own benefit for low and moderate income families, worth up to $1,760 per child per year according to Ontario’s Ontario Child Benefit page. The CRA administers it on Ontario’s behalf, and there is no separate application: applying for the CCB automatically assesses you for the OCB.

The condition people trip over is the filing requirement. You must file a return every year to qualify, even with no income to declare. The same is true federally. A stay-at-home parent with no income who stops filing is the single most common way a household loses a benefit it was entitled to, and the money is recoverable only by filing the missed years. A return filed purely to keep the benefits flowing, with no tax owing on it, carries no late-filing penalty, so the fix is simply to get the returns in. The CRA will generally reassess entitlement for those years once it has the income information.

Ontario also delivers the Ontario Trillium Benefit through the same annual return, so one missed filing can interrupt several payments at once.

Shared custody: fifty percent, and nothing else

Where the CRA considers custody to be shared, each parent receives 50 percent of what they would have received with full custody, calculated on their own AFNI. The CRA is explicit that it will not split the amount in any other proportion and will not pay the full amount to one parent. A 60/40 parenting schedule does not produce a 60/40 benefit split.

This matters in a separation because the benefit is not negotiable between the parties in the way support is. Two parents with very different incomes will receive very different halves. The interaction with support payments and the eligible dependant credit is covered in financial planning after a divorce.

Children with a disability

Where a child qualifies for the Disability Tax Credit, the family may also be entitled to the child disability benefit, which is paid monthly with the CCB. It is not a separate application either: it follows automatically from DTC approval, which is why getting the Disability Tax Credit certified promptly is worth more than the credit itself. DTC approval is also the gateway to the RDSP and to the higher child care expense limit.

Why did my payment change?

Your CCB changed. Work through these in order.
│
├── Did it change in July?
│   └── Yes → Normal annual recalculation on last
│             year's AFNI. Compare the two returns.
│
├── Did a child turn 6 or 18?
│   └── The rate drops at 6; the benefit ends the
│       month the child turns 18.
│
├── Did your marital status change?
│   └── A new spouse adds their income to AFNI from
│       the month after the change. Report it.
│
├── Did you or your spouse not file?
│   └── Payments stop until both returns are filed.
│
└── None of these?
    └── Check for an overpayment recovery. The CRA
        offsets past overpayments against current
        payments without a separate notice.

The practical points

• Report a marital status change promptly. The CRA recalculates from the month after the change, and a late report usually produces an overpayment that is clawed back from future months. The broader effects of a status change are in what changes when you marry or become common-law.
• Newcomers should apply immediately. Entitlement does not wait for a first tax return, but the CRA needs income information for the prior years, which is part of the first Canadian return.
• Use the CRA’s own estimator rather than guessing. The child and family benefits calculator applies the current year’s figures and the provincial add-ons together.
• Keep the eligibility conditions in view. The who can apply page turns on residency and on who is primarily responsible for the child’s care, and the CRA does ask for proof.

If your benefit dropped and you cannot see why, or you are weighing an RRSP contribution against a benefit clawback and want the combined number rather than the tax number, send me both spouses’ returns and the CRA benefit notice and I will work out what the payment should be and what a contribution is actually worth. Get in touch and include the notice, not just the amount.