Hi Rupert, I’m happy to hear you were approved as it will help a little bit.
The disability tax credit (DTC) is a non-refundable tax credit which means that you, or a supporting person, must have a taxable income in order to benefit from the credit. The DTC is available for people of all ages meeting the DTC definition of disability. The bottom line value of the DTC to you will depend on which province you live in on December 31, your age and a few other complex factors which can’t easily be addressed in a posting. For example, a child eligible for the DTC will be eligible for a higher credit than a person over 18. The “federal” disability amount used in the calculation is the same for all qualified Canadians, but the “provincial” disability amount varies quite a bit as provinces can set their own disability amounts. This is why the range you’ve seen of $1,500 to $2,000 is generally accurate as a bottom line benefit for most eligible DTC claimants.
Note that the DTC is a non-refundable tax credit, and the tax relief/bottom line benefit is the same to all DTC claimaints in your province whether you have a low income or a high income. Other types of “deductions” from income or credits can receive tax relief at your marginal tax rate, which would mean that a high income person, who pays a high tax rate on the last dollar earned, would benefit a lot more than a low income person who pays tax at a lower rate. The DTC works differently and benefits everyone in a taxable income situation the same.
In summary, the bottom line benefit of the DTC to you depends on the province where you reside, not the level of your/your supporting person’s taxable income (assuming, of course, a person’s income is at a taxable level).