Key Takeaways
- 1.The federal DTC for a child under 18 combines a $9,872 base and $5,758 supplement (2025), yielding a non-refundable credit of $2,344.50 at the 15% federal rate.
- 2.Quebec's provincial credit is separate from the federal DTC — you must file form TP-752.0.14-V with Revenu Québec. The combined Quebec amount of $5,274 yields a provincial credit of approximately $738 at 14%.
- 3.The Child Disability Benefit (CDB) adds up to $3,322/year tax-free, paid monthly through the CCB — automatically triggered once the DTC is approved.
- 4.Retroactive claims go back 10 years. A Quebec family at $100K income can recover $20,000+ federally plus $6,000–$7,000 provincially in missed credits.
- 5.DTC approval opens the RDSP: the Canada Disability Savings Bond deposits $1,000/year for low-to-moderate-income families — no personal contributions required. Over 18 years, that is $18,000 in free government money.
Federal DTC Value for a Child Under 18: The 2025 Calculation
The Disability Tax Credit is a non-refundable tax credit. For a child under 18 at the end of the tax year, the claimant — typically a parent — can claim both the base disability amount and the child supplement. Since the child usually has no taxable income, the full credit transfers to the supporting parent.
Federal DTC calculation for a child under 18 (2025):
Base disability amount: $9,872
Child supplement: $5,758
Total DTC-eligible amount: $15,630
Federal credit rate: 15%
Federal DTC value: $15,630 × 15% = $2,344.50
Supplement reduction:
If child-care expenses (line 21400) claimed for this child = $3,000:
Reduced supplement: $5,758 − $3,000 = $2,758
Reduced total: $9,872 + $2,758 = $12,630
Reduced federal credit: $12,630 × 15% = $1,894.50
The child supplement is reduced dollar-for-dollar by child-care expenses claimed for that child by either parent. If you claim $5,758 or more in child-care expenses for the child, the supplement is fully eliminated — but the base $9,872 amount (worth $1,480.80 in federal credits) remains unaffected.
Quebec Provincial Credit: TP-752.0.14-V and the Separate Rate Schedule
This is the gap that every major DTC calculator misses. Quebec does not simply apply a provincial percentage to the federal DTC base amount the way Ontario, BC, or Alberta do. Quebec has its own impairment credit with its own dollar amounts, its own eligibility certificate (TP-752.0.14-V), and its own rate schedule.
Quebec provincial disability credit (2025):
Quebec amount for severe and prolonged impairment: $3,864
Quebec supplement for dependant under 18: $1,410
Total Quebec credit-eligible amount: $5,274
Quebec lowest tax rate: 14%
Quebec provincial credit: $5,274 × 14% = $738.36
Compare this to Ontario, where the provincial DTC credit is simply the federal base amount ($9,872) multiplied by Ontario's lowest rate (5.05%), yielding $498.54 — and there is no separate provincial child supplement at all. Quebec families actually receive a higher combined provincial credit than Ontario families because of the dedicated Quebec child supplement of $1,410. For a broader look at Quebec provincial tax mechanics, see our Quebec income tax calculator.
Combined Federal + Quebec Credit Value at Three Income Levels
The DTC itself is a non-refundable credit calculated at the lowest marginal rate, so the credit value does not change with income. However, the Child Disability Benefit (CDB) — the tax-free monthly supplement paid through the CCB — does phase out with income. Here is the combined annual value of all DTC-triggered benefits for a Quebec family with one eligible child and no child-care expenses claimed.
| Benefit | $75K Income | $100K Income | $130K Income |
|---|---|---|---|
| Federal DTC (base + supplement) | $2,345 | $2,345 | $2,345 |
| Quebec provincial credit | $738 | $738 | $738 |
| Child Disability Benefit (CDB) | ~$3,100 | ~$2,500 | ~$1,800 |
| Total annual value | ~$6,183 | ~$5,583 | ~$4,883 |
Federal DTC and Quebec credit are non-refundable credits that reduce tax owing. CDB is a tax-free monthly payment. CDB amounts are approximate and depend on total CCB entitlement, number of children, and adjusted family net income. Assumes no child-care expenses claimed for the eligible child. 2025 amounts.
A Quebec family at $75,000 income receives over $6,100 per year in combined credits and benefits from a single DTC approval for one child with Type 1 diabetes. Even at $130,000 income, the annual value exceeds $4,800. These amounts recur every year until the child turns 18 — and the base DTC continues into adulthood.
Quebec vs. Ontario: Why the Provincial Credit Mechanism Matters
Most DTC calculators default to Ontario rates and assume the provincial credit is simply a percentage of the federal base. For Quebec families, this produces the wrong number.
| Component | Quebec | Ontario |
|---|---|---|
| Provincial credit-eligible amount (impairment) | $3,864 | $9,872 (federal amount) |
| Provincial child supplement | $1,410 | $0 |
| Provincial lowest tax rate | 14% | 5.05% |
| Provincial credit value | $738 | $499 |
| Eligibility form | TP-752.0.14-V | Federal T2201 only |
| Combined federal + provincial credit | $3,083 | $2,844 |
Quebec uses its own amount and rate schedule for the provincial disability credit. Ontario applies 5.05% to the federal base amount and has no provincial child supplement. The Quebec combined credit is approximately $239 more per year than Ontario. For families also claiming child-care expenses, the gap narrows because Quebec's supplement is smaller than the federal supplement and reduces faster relative to its size.
10-Year Retroactive Claim: How Much Can a Quebec Family Recover?
If your child was diagnosed with Type 1 diabetes years ago and you never applied for the DTC, the CRA allows you to request adjustments to your tax returns for up to 10 prior years. Each year's refund uses that year's DTC amounts and tax rates. Revenu Québec similarly allows retroactive adjustments for the provincial credit.
Estimated 10-year retroactive refund (Quebec family, child under 18):
Federal DTC refund (10 years):
Average annual federal credit (2016–2025): ~$2,100
(DTC amounts have increased with indexation each year)
Estimated 10-year federal refund: ~$21,000
Quebec provincial refund (10 years):
Average annual Quebec credit (2016–2025): ~$650
Estimated 10-year Quebec refund: ~$6,500
Combined retroactive recovery: ~$27,500
Plus retroactive CDB (up to 11 months):
The CRA can pay retroactive CDB for up to 11 months from the
date the DTC application is approved — not 10 years.
At $75K income: ~$2,850 retroactive CDB
At $100K income: ~$2,290 retroactive CDB
The retroactive federal refund is straightforward: file T1 Adjustment Requests for each year. The Quebec retroactive claim requires separate adjustment requests to Revenu Québec. You need the T2201 approved by the CRA and the TP-752.0.14-V approved by Revenu Québec, each specifying the effective date of the disability. The medical practitioner must certify that the impairment existed during the retroactive period. For context on how Quebec handles other family-related registered accounts, see our blended family RESP calculator covering Quebec grants.
RDSP: The $1,000/Year Bond That Requires No Contributions
Once a child is approved for the DTC, a parent can open a Registered Disability Savings Plan (RDSP) on the child's behalf. The RDSP is the only registered account in Canada that receives direct government deposits even when the account holder contributes nothing.
Canada Disability Savings Bond (CDSB) — no contributions required:
Family net income below $36,502 (2025): $1,000/year
Family net income $36,502–$56,491: Prorated amount
Family net income above $56,491: $0
Lifetime bond limit: $20,000
Maximum years of bond eligibility: 20 (from first eligible year to age 49)
18-year projection (child approved at birth, income below $36,502):
Total CDSB deposits: 18 × $1,000 = $18,000
At 5% average annual return: ~$28,100 by age 18
Canada Disability Savings Grant (CDSG) — matches contributions:
If the family also contributes $1,500/year:
CDSG match: 300% on first $500 + 200% on next $1,000 = $3,500/year
Lifetime grant limit: $70,000
Combined government deposits (bond + grant) on $1,500/year contribution:
$1,000 bond + $3,500 grant = $4,500/year from the government
The RDSP has a 10-year hold rule: any government grants and bonds received in the 10 years before a withdrawal are repaid to the government ($3 for every $1 withdrawn, up to the assistance holdback amount). This makes the RDSP a long-term vehicle — ideally held until the beneficiary reaches adulthood and needs financial support. For families managing other registered accounts alongside the RDSP, see our FHSA vs. RRSP comparison for Quebec residents.
Step-by-Step: How to Apply for the DTC in Quebec
The application process involves two separate agencies. Missing either one means leaving money on the table.
Step 1: Federal T2201 (CRA)
• Download Form T2201 from canada.ca
• Part A: completed by the parent/applicant
• Part B: completed by a medical practitioner (MD, NP, or optometrist
depending on impairment type)
• For Type 1 diabetes: the practitioner certifies the child requires
life-sustaining therapy at least 3 times per week, averaging 14+ hours
• Submit to the CRA by mail or through the practitioner's digital portal
• Processing time: 8–16 weeks
Step 2: Quebec TP-752.0.14-V (Revenu Québec)
• Download form TP-752.0.14-V from revenuquebec.ca
• Must be completed by a medical practitioner (same doctor can do both)
• Submit to Revenu Québec separately from the federal form
• Processing time: 6–12 weeks
Step 3: Retroactive adjustments (if applicable)
• Federal: file T1-ADJ for each year, or submit through My Account
• Quebec: file TP-1.R for each year, or submit through Mon dossier
Step 4: Open RDSP
• Bring DTC approval letter to a participating financial institution
• Apply for the CDSB and CDSG (same form)
• Request retroactive bonds/grants for any missed years (up to 10 years)
Full Worked Example: Quebec Family, $100K Income, Child Age 8
A Quebec couple with a combined household income of $100,000 has an 8-year-old child diagnosed with Type 1 diabetes at age 3. They never applied for the DTC. Here is the complete financial picture when they apply now.
| Benefit Stream | One-Time Recovery | Annual (Ongoing) |
|---|---|---|
| Federal DTC (5 years retroactive, ages 3–7) | ~$10,800 | $2,345/yr |
| Quebec provincial credit (5 years retroactive) | ~$3,400 | $738/yr |
| Child Disability Benefit (11 months retroactive) | ~$2,290 | ~$2,500/yr |
| RDSP bonds (5 years retroactive carry-forward) | ~$5,000 | varies by income |
| Total | ~$21,490 | ~$5,583/yr |
Retroactive federal DTC amounts are approximate and reflect indexed amounts for each prior tax year. RDSP bond carry-forward is limited to one additional year of bond per year (maximum $11,000 in a single year). Family income of $100K may partially reduce the bond amount. Figures assume no child-care expenses claimed for the eligible child.
From age 8 to 18, this family receives approximately $55,800 in ongoing federal and provincial credits plus CDB payments — on top of the $21,490 one-time recovery. If they contribute even $1,500 per year to the RDSP, they receive up to $3,500 annually in matching grants from the government. For families also managing Quebec-specific tax situations, see our lifetime capital gains exemption calculator for Quebec.
Child-Care Expense Interaction: How the Supplement Reduces
The child supplement ($5,758 federally, $1,410 provincially in Quebec) is reduced by child-care expenses claimed for the child. This creates a planning decision: should you claim child-care expenses for a DTC-eligible child?
Child-care expense trade-off (federal only):
Child-care expenses claimed: $8,000
Child-care expense deduction value (at 40.12% Quebec marginal rate): $3,210
DTC supplement reduction: $5,758 reduced to $0 (fully eliminated)
Lost DTC credit: $5,758 × 15% = $863.70
Net benefit of claiming child-care expenses: $3,210 − $863.70 = $2,346.30
Claiming child-care expenses is almost always worth it because the
deduction value at your marginal rate (20%–53%) far exceeds the 15% credit
lost on the supplement. The supplement reduction is a cost, not a reason to skip
the child-care deduction.
Beyond Age 18: What Changes When the Child Becomes an Adult
When the child turns 18, the child supplement ($5,758 federal, $1,410 Quebec) ends. The base DTC amount ($9,872) continues for as long as the disability persists. The Child Disability Benefit also ends at 18, but the adult may qualify for the Canada Disability Benefit (CDB-A) when it launches. The RDSP continues and can receive contributions until the beneficiary turns 59, with grants and bonds available until age 49. For families planning registered account strategies as children age, see our RRSP vs. TFSA comparison for long-term savings.
| Benefit | Under 18 | 18+ |
|---|---|---|
| Federal DTC base ($9,872) | Yes (transfers to parent) | Yes (claimed by individual) |
| Federal child supplement ($5,758) | Yes | No |
| Quebec impairment amount ($3,864) | Yes | Yes |
| Quebec child supplement ($1,410) | Yes | No |
| Child Disability Benefit | Up to $3,322/yr | Ends |
| RDSP grants and bonds | Yes | Yes (to age 49) |
Common Mistakes That Cost Quebec Families Thousands
1. Filing only the federal T2201 and not the Quebec TP-752.0.14-V
Cost: ~$738/year in missed provincial credits. Over 10 years: ~$6,500.
2. Not opening an RDSP after DTC approval
Cost: Up to $1,000/year in missed CDSB bonds (no contribution required) plus
up to $3,500/year in missed CDSG grants (if contributing $1,500/year).
3. Not filing retroactive adjustments
Cost: The full retroactive recovery — potentially $20,000–$30,000
depending on the number of years and income level.
4. Assuming the DTC requires total disability
Type 1 diabetes qualifies because insulin therapy is life-sustaining therapy
requiring 14+ hours per week. Many conditions that require ongoing, regular
treatment meet the CRA's criteria — the bar is "markedly restricted"
or "life-sustaining therapy," not total disability.
5. Not requesting retroactive RDSP bonds and grants
The RDSP allows carry-forward of unused bond and grant room for up to 10 years.
A family opening an RDSP when the child is 8 can request catch-up deposits for
prior years, subject to annual limits ($11,000/year for bonds, $10,500 for grants).
For more on how Quebec families manage registered account contributions across multiple children, see our TFSA contribution room calculator for newcomers.
Important Disclaimer
This article provides general information about the federal Disability Tax Credit, the Quebec provincial disability credit, the Child Disability Benefit, and the Registered Disability Savings Plan. It is not legal, financial, or tax advice. The federal DTC base amount of $9,872 and child supplement of $5,758 are the 2025 indexed amounts as published by the CRA. Quebec's impairment amount of $3,864 and child supplement of $1,410 are based on Revenu Québec's 2025 tax guide. The Child Disability Benefit maximum of $3,322 is for the July 2025–June 2026 benefit year. RDSP bond and grant amounts are set by Employment and Social Development Canada and depend on family net income and contribution levels. Eligibility for the DTC is determined by the CRA (federally) and Revenu Québec (provincially) based on medical certification — approval is not guaranteed. Retroactive claim periods and adjustment request procedures are subject to CRA and Revenu Québec guidelines. Consult a qualified tax professional for advice specific to your family's situation.