A non-refundable tax credit reduces income tax payable but cannot create a refund. Each credit starts as a dollar "amount" (for example the $16,452 basic personal amount), and the total of the amounts on line 35000 is multiplied by the lowest federal rate, 14 percent for 2026 (14.5 percent for 2025). Provinces run a parallel system on their own forms, using their own amounts and their lowest rate (5.05 percent in Ontario). Unused credits are generally lost, except where specific carry-forward or transfer rules apply.
Every taxpayer gets the same rate of relief, regardless of income, which makes credits more progressive than deductions.
If tax is already zero, extra credits have no value, so low-income taxpayers often cannot use them fully.
Some credits can be transferred to a spouse, parent or grandparent; some can be carried forward to future years.
Transferable to a spouse or partner (line 32600): age amount, pension income amount, disability amount, Canada caregiver amount for children, and up to $5,000 of current-year tuition.
Transferable to a parent or grandparent: up to $5,000 of tuition, and the disability amount of a dependant.
Carry forward: tuition (indefinitely), student loan interest (five years), donations (five years).
Flexible claimant: medical expenses and donations can be pooled and claimed by either spouse.