# Child Disability Benefit (CDB) 2026: Complete Guide for Canadian Parents
Child Disability Benefit (CDB): A tax-free monthly payment provided to families caring for a child under 18 who is eligible for the Disability Tax Credit. The CDB is administered as a supplement to the Canada Child Benefit (CCB) and does not need to be applied for separately — it is automatically calculated when a child's DTC is approved.
For a comprehensive overview of the DTC, see our Complete Guide to the Disability Tax Credit in Canada. For an overview of all child-related DTC benefits, see our Child Disability Benefits page.
What Is the Child Disability Benefit?
The Child Disability Benefit is a tax-free monthly supplement to the Canada Child Benefit (CCB), designed to help families caring for a child with a severe and prolonged disability. When your child is approved for the Disability Tax Credit, the CDB is automatically triggered — but most families don't receive the full amount they're entitled to.
Key Facts
| Detail | Information |
|---|---|
| Maximum annual amount | Up to $3,411 per child (2025–2026 benefit year) |
| Monthly payment | Up to ~$284 per eligible child |
| Income tested? | Yes — reduced when family net income exceeds ~$75,537 |
| Taxable? | No — the CDB is entirely tax-free |
| Separate application? | No — triggered automatically by DTC approval |
| Age limit | Under 18 years old |
How Much Will You Receive?
The CDB amount depends on your adjusted family net income (AFNI). For the 2025–2026 benefit year:
- Full amount: Up to $3,411/year (~$284/month) if AFNI is below the threshold
- Reduced amount: The benefit is gradually reduced for families with higher incomes
- Per child: The CDB is calculated per eligible child — if you have two DTC-eligible children, you receive the CDB for each
Even families with moderate incomes typically receive a significant portion of the CDB. The benefit is recalculated each July based on your previous year's tax return.
The Retroactive CDB Claim Most Families Miss
This is the most important section of this guide. When your child's DTC is approved retroactively, CRA handles the CDB in two different ways:
Automatic: Current + Previous Benefit Years
CRA automatically calculates and pays the CDB for the current benefit year and a limited number of previous benefit years. This happens without any action from you. You'll receive a lump-sum payment for the retroactive period plus ongoing monthly payments going forward.
Written Request Required: Additional Retroactive Years
For benefit years before the automatic calculation period, you must submit a written request to your CRA tax centre. Without this step, you may only receive a portion of the retroactive CDB you're entitled to — even if your child was approved for many years of DTC.
Important: CRA does not automatically calculate CDB for all retroactive years. You must send a written request to your local CRA tax centre to receive the full retroactive CDB. Most families never do this — leaving thousands of dollars unclaimed.
How to Submit the Written Request
- Write a letter to your CRA tax centre requesting retroactive CDB calculation
- Include your child's name, SIN, and the DTC approval dates
- Reference the specific benefit years you're requesting
- Mail it to the tax centre that handles your region
My Benefits Canada handles this step for every client. We prepare and submit the retroactive CDB written request on your behalf, ensuring you receive every dollar your family is entitled to.
Example: What a Retroactive Claim Can Look Like
Consider a family with one DTC-eligible child and a family income below the threshold:
| Benefit Component | Estimated Amount |
|---|---|
| DTC retroactive refund (up to 10 years) | $30,000–$40,000 |
| CDB automatic (current + recent years) | $7,000–$10,000 |
| CDB written request (additional retroactive years) | $10,000–$24,000 |
| Total combined | $47,000–$74,000 |
The written request portion alone can be worth tens of thousands of dollars. This is money that CRA will pay — but only if you ask for it.
DTC Supplement for Children Under 18
In addition to the CDB, children under 18 who are DTC-eligible receive an enhanced federal DTC amount — approximately $5,500 above the base DTC amount. This means the total federal DTC for an eligible child is approximately $14,928, resulting in a larger tax reduction and retroactive refund than for adults.
Common Conditions That Qualify Children for the DTC
Children with the following conditions frequently qualify for the DTC — and therefore the CDB:
- ADHD & Executive Function Disorders — when they cause marked restriction in mental functions
- Autism Spectrum Disorder — social communication, sensory processing, adaptive functioning
- Type 1 Diabetes — qualifies under life-sustaining therapy (14+ hours/week)
- Anxiety, Depression & PTSD — when persistent and significantly restricting daily functioning
- Down Syndrome & Intellectual Disabilities — cognitive and adaptive functioning restrictions
- Epilepsy & Seizure Disorders — when requiring ongoing therapy and causing daily restrictions
- Speech & Language Disorders — non-verbal autism, developmental speech delays
CRA evaluates eligibility based on functional impact, not diagnosis alone. Many children qualify but their families never apply.
RDSP: The Third Benefit Most Families Overlook
Once your child is DTC-approved, you can open a Registered Disability Savings Plan (RDSP). The government contributes:
- Canada Disability Savings Grant: Up to $3,500/year in matching grants (up to $70,000 lifetime)
- Canada Disability Savings Bond: Up to $1,000/year for low-income families (no contribution required)
- Carry-forward: Unused grant and bond room can be carried forward up to 10 years
An RDSP opened early in a child's life can accumulate hundreds of thousands of dollars by adulthood — providing long-term financial security.
How My Benefits Canada Helps Families
We provide a complete, medically coordinated DTC concierge service for families with children:
- Free eligibility assessment — determine if your child may qualify
- T2201 preparation — using CRA-aligned functional impact language
- Medical coordination — working directly with your child's paediatrician, psychologist, or specialist
- CRA submission & monitoring — we submit and track your application
- Retroactive tax adjustments — up to 10 years of refunds
- CDB retroactive written request — ensuring you receive every dollar of retroactive CDB
- RDSP guidance — how to open and maximize government contributions
Our fee is 25% of retroactive refunds only — collected after CRA approval. If your child's application is not approved, you pay nothing.
Frequently Asked Questions
Do I need to apply separately for the CDB? No. The CDB is automatically triggered when your child's DTC is approved. However, you must submit a written request for retroactive CDB beyond the automatic calculation period.
Can I receive the CDB for more than one child? Yes. The CDB is calculated per eligible child. If you have two DTC-approved children, you receive the CDB for each.
What if my income is too high? The CDB is reduced for higher-income families but is not eliminated entirely until income is well above the threshold. Most families receive at least a partial benefit.
Does the CDB affect my other government benefits? No. The CDB is tax-free and does not affect your eligibility for other benefits like the GST/HST credit or provincial benefits.
Take our free eligibility assessment → | Call 1-844-MY-BENEFITS (1-844-692-3633)
This guide is for informational purposes only and does not constitute tax or legal advice. All DTC eligibility decisions are made solely by the Canada Revenue Agency. My Benefits Canada is an independent service provider and is not affiliated with or endorsed by the CRA.
