How the DTC Affects Your Income Tax Return
Which line of your tax return carries the DTC?
See where the DTC goes on a Canadian tax return, how transfers and the under-18 supplement work, and why low tax payable can limit its value.
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Once the Disability Tax Credit (DTC) is approved, it changes the calculation on a tax return rather than creating a payment. The disability amount is entered on the appropriate federal line, a transfer uses a different line, and the credit can reduce tax payable only until that tax reaches zero. A low-tax year may leave part of its value unused.
This guide focuses on the mechanics after approval for Canadians, including people filing in Quebec. It uses the confirmed 2025 tax-year figures and line numbers in the Canada Revenue Agency (CRA) facts for this article. Provincial rules and amounts vary by province, so the examples below describe the federal DTC only.
Which line of your tax return carries the DTC?
The line depends on who is claiming the disability amount. Claim it for yourself on line 31600, claim an amount transferred from a dependant on line 31800, or report an amount transferred from a spouse or common-law partner on line 32600. These lines identify the DTC path before the non-refundable credit affects federal tax payable.
| Situation | Tax return line | What the line represents |
|---|---|---|
| You are claiming your own disability amount | 31600 | Disability amount for self |
| You are claiming an amount transferred from a dependant | 31800 | Disability amount transferred from a dependant |
| You are claiming an amount transferred from a spouse or common-law partner | 32600 | Amounts transferred from a spouse or common-law partner |
What goes on line 31600?
Line 31600 is the route for the disability amount when the person with the approved DTC claims it for themselves. For the 2025 tax year, the confirmed disability amount for a person aged 18 or older is $10,138. That is an amount used in the federal credit calculation. It is not a cheque for $10,138 and it is not automatically the amount removed from income.
The federal non-refundable rate is about 15%. As an arithmetic illustration, applying 15% to $10,138 gives about $1,521 in potential federal tax reduction before considering the person's actual tax payable. The facts for this article summarize that result as roughly $1,500. The exact usable result depends on the return and the amount of federal tax otherwise payable.
What if a supporting person uses the amount?
If the person with the disability cannot use all or part of the disability amount, an eligible supporting person may be able to claim a transferred amount. The return must use the line that matches the relationship and transfer route. A dependant transfer is reported on line 31800. A transfer from a spouse or common-law partner is reported on line 32600.
Do not treat these lines as interchangeable labels. Line 31800 describes a disability amount transferred from a dependant. Line 32600 describes amounts transferred from a spouse or common-law partner. The practical question is who the transfer came from, not merely who receives the tax effect.
The transfer can move usable tax relief within a family, but it does not turn a non-refundable credit into cash. The receiving person still needs enough tax payable to use the amount. If the receiving person's federal tax payable is low, the family may not realize the full illustrative value of the disability amount.
For background on the application step before this filing step, see REEI's DTC application support. Approval is required before the DTC can be claimed and before an RDSP can be opened or maintained.
How should related deductions be kept separate?
The DTC line is not a catch-all for disability-related costs. Other expenses have their own lines and may interact with the under-18 supplement. Child care expenses belong on line 21400. The disability supports deduction belongs on line 21500. Medical expenses are reported on line 33099 or line 33199, including a practitioner's fee for completing the DTC form when it qualifies as a medical expense under the CRA rules.
| Item on the return | Line or lines | Why it matters here |
|---|---|---|
| Child care expenses | 21400 | Can reduce the under-18 DTC supplement when claimed for the child |
| Disability supports deduction | 21500 | Can matter when the child claims attendant care expenses under the supplement rule |
| Medical expenses | 33099 or 33199 | Can reduce the under-18 supplement when attendant care expenses are claimed for the child, and can include a qualifying practitioner fee |
These entries should be checked together instead of assuming that every disability-related amount belongs beside the DTC. A credit and a deduction are different parts of the return. The line number helps identify which calculation is being made, while the surrounding facts determine whether an amount is usable.
How does a DTC transfer appear when someone else claims it?
A transfer changes who reports the usable disability amount, not the underlying reason for the DTC. The person's return uses line 31800 for an amount transferred from a dependant, while a spouse or common-law partner transfer uses line 32600. The receiving person's tax payable, not the transfer label alone, limits the result.
What is the difference between a dependant transfer and a spouse transfer?
Use line 31800 when the return is claiming a disability amount transferred from a dependant. Use line 32600 for amounts transferred from a spouse or common-law partner. This distinction is important because the CRA return is organized by the relationship behind the transfer. It also prevents a family from putting a transferred amount on the self line by mistake.
The transfer is not a new DTC approval for the supporting person. The approved disability status belongs to the person whose impairment was assessed. The transfer simply allows an amount that the person with the disability cannot use to be considered on the supporting person's return, subject to the applicable rules and available tax payable.
What should the supporting person check before filing?
First, confirm that the DTC approval covers the tax year being claimed. Next, identify whether the amount is transferred from a dependant or from a spouse or common-law partner. Then check the receiving person's federal tax payable. A transfer can be correctly reported and still produce less value than the full amount when tax payable is too low.
Keep the transfer mechanics separate from other family benefits. DTC approval may connect to other programs, but a transfer line on a return does not itself create a monthly payment. For a practical estimate based on personal inputs, use the DTC calculator, then compare the estimate with the return's tax payable.
When the recipient is a spouse or common-law partner, line 32600 is the specific line identified in the facts for this article. When the recipient claims an amount from a dependant, line 31800 is the specific line. Rechecking that pair before filing is a simple safeguard against a damaging line-number error.
Can a transfer use the entire disability amount?
Not automatically. The usable amount is constrained by the credit rules and by tax payable. If the person with the disability has some tax payable, they may use part of the disability amount themselves, with any eligible transfer considered under the applicable rules. The return should reflect the amount actually available for that claimant's situation, not a blanket assumption that the full figure moves.
This is also why a headline figure can mislead. The 2025 disability amount for a person aged 18 or older is $10,138, while the approximate federal tax effect is about $1,500 at the confirmed rate. Neither figure guarantees that the full approximate tax reduction will be used. The non-refundable rule applies whether the claimant is the person with the disability or a supporting person.
What happens to the under-18 supplement?
For the 2025 tax year, a child under 18 has a disability amount of $10,138 plus an under-18 supplement of $5,914, for a combined amount of $16,052. The supplement is reduced when specified child care or attendant care expenses are claimed. The reduction rule must be checked alongside lines 21400, 21500, 33099 or 33199.
| Under-18 DTC component | 2025 tax-year amount | What to verify |
|---|---|---|
| Disability amount | $10,138 | The child has an approved DTC and the claim covers the relevant year |
| Under-18 supplement | $5,914 | Specified child care or attendant care expenses may reduce it |
| Combined under-18 amount | $16,052 | The combined figure does not override the reduction rule or the non-refundable limit |
Which expenses can reduce the supplement?
The under-18 supplement is reduced if, in the year, someone claimed child care expenses for the child on line 21400. It can also be reduced if someone claimed attendant care expenses for the child on line 33099 or line 33199. The rule is about the expenses claimed for the child, so the return entries need to be reviewed together.
The supplement can also be reduced if the child claimed attendant care expenses on line 21500 or on line 33099. That is why line 21500 belongs in the review even though it is described as the disability supports deduction. The relevant question is whether the specified attendant care expense was claimed in the way covered by the supplement rule.
| Claim that may reduce the under-18 supplement | Relevant line | Review question |
|---|---|---|
| Child care expenses claimed for the child | 21400 | Was child care claimed for the child in the same year? |
| Attendant care expenses claimed for the child | 33099 or 33199 | Was attendant care claimed for the child on either medical-expense line? |
| Attendant care expenses claimed by the child | 21500 or 33099 | Did the child claim the expense under the disability supports or medical-expense line? |
Does the supplement guarantee a larger tax reduction?
No. The supplement increases the under-18 disability amount used in the calculation when it has not been reduced, but it remains part of a non-refundable credit. A family can therefore face two separate limits: the supplement may be reduced by specified expenses, and the remaining credit may be worth less than its full illustrative federal value when tax payable is low.
Do not infer a reduction merely because a family paid for care. Match the expense to the line and the claimant described in the rule. Conversely, do not ignore a possible reduction because the child has an approved DTC. The DTC approval and the supplement calculation are related, but they are not the same check.
What does non-refundable mean in practice?
Non-refundable means the DTC can reduce tax payable, but unused credit value is not paid out as a refund. The federal disability amount is applied against the tax otherwise payable. If the available credit could reduce tax below zero, the reduction stops at zero, and the excess is not returned as cash.
What is a low-tax-payable example?
Here is an illustrative calculation, not a CRA amount. Assume a person aged 18 or older has the confirmed 2025 disability amount of $10,138 on line 31600 and federal tax payable of $900 before the DTC. Assume the approximate federal rate of 15% for this illustration. The arithmetic value is $10,138 multiplied by 15%, or about $1,521.
| Illustrative step | Assumption or arithmetic | Result |
|---|---|---|
| Disability amount | Confirmed 2025 amount for self | $10,138 |
| Approximate federal rate | Assumption based on the facts | 15% |
| Approximate credit value | $10,138 multiplied by 15% | About $1,521 |
| Federal tax payable before DTC | Illustrative assumption | $900 |
| Usable reduction in this illustration | Limited by tax payable | $900 |
| Approximate unused value | About $1,521 minus $900 | About $621, not paid as a refund |
Under those assumptions, the DTC is worth $900 in the current calculation, not about $1,521, because the person has only $900 of federal tax payable to reduce. The difference is an illustration of the non-refundable limit. It is not a promise about an individual's result, and it is not a CRA-published calculation for a specific taxpayer.
What if tax payable is higher?
If the same illustrative credit value is available and federal tax payable is high enough, more of the approximate value may be used. The result still depends on the return's actual calculation. The DTC reduces tax payable; it does not create a payment simply because the disability amount is large.
The same principle applies to a transferred amount. A supporting person with enough tax payable may use more of the transferred credit than a supporting person with little or no tax payable. This is why a family should review the claimant, transfer line, disability amount, related deductions and tax payable as one filing picture.
How does this differ from a deduction?
A deduction and a non-refundable credit work at different stages. A deduction, such as the disability supports deduction on line 21500, is considered in the calculation of income. The DTC is a non-refundable credit applied to tax payable. The line numbers are not interchangeable, and claiming one does not mean the other has been claimed.
Medical expenses on line 33099 or line 33199 and child care expenses on line 21400 also have their own place in the return. They may matter to the under-18 supplement rule, but they do not become the DTC simply because they relate to disability or care. Check the claim, claimant and line before estimating the result.
Can the DTC help with past years?
Eligible individuals can claim the DTC for previous tax years, with a confirmed retroactive window of up to 10 years. Each year has its own confirmed disability amount and under-18 supplement. A past-year reassessment still follows the same basic logic: use the appropriate line, check the supplement rule where relevant and remember that the credit is non-refundable.
The confirmed disability amounts and supplements are different across the years. For example, the disability amount is $9,872 and the supplement is $5,758 for 2024, while the 2025 figures are $10,138 and $5,914. Do not carry the current year's figure into an earlier return. The REEI DTC information page can help with the broader claim context, while the CRA's line 31600 guidance is the federal reference for the self line.
What should you check before submitting?
Use a short final check: identify the claimant, select line 31600, 31800 or 32600 as appropriate, and confirm the year-specific amount. If the claimant is under 18, review lines 21400, 21500, 33099 and 33199 for expenses that can reduce the supplement. Finally, compare the credit's approximate tax effect with actual tax payable.
For the official retroactive rule, see the CRA's DTC claiming guidance. For a child under 18, the CRA's Child Disability Benefit guidance is a separate reference. The DTC mechanics on a return remain the same: correct line, correct year, correct claimant and a realistic view of what non-refundable means.
