CRA has the following information on the T3012A form itself:
- Reporting the refund on your Income Tax and Benefit Return:
When you complete your Income Tax and Benefit Return for the year you receive the refund, report the total refund of unused contributions that you made to your own or your spouse's or common-law partner's registered plans. The amount is reported on line 12900 of the Income Tax and Benefit Return. You will find this total in box 20 of your own or your spouse's or common-law partner's T4RSP slips. Claim the deduction at line 23200 if the refund is received within the time frame outlined above.
Attach these T4RSP slips and a copy of this form showing the designated refund amount to your Income Tax and Benefit Return. After you have deducted the amount you entered on line 23200 from your income, you cannot deduct it on line 20800 for any year. We will reduce your unused RRSP contributions available to carry forward to later years by the amount of your refund.
So you will not need to do anything on your 2019 tax return if you have not received any refund of your unused contributions in 2019.
Here is a copy of that form with this information at the end of the 2nd page: Tax Deduction Waiver on the Refund of your Unused RRSP, PRPP, or SPP Contributions from your RRSP
