CRA publishes prescribed interest rates each quarter. If you are in arrears to the government, for example, late in paying your income tax instalment, you will be charged interest. Visit Interest rates for the fourth calendar quarter – Canada.ca for the new Q4 (October 1 – December 31, 2023) rates.
This new online form was created to make applying for the DTC an easier and more efficient process. Applicants no longer need to print out the form and take it to their doctor.