As you made your RRSP withdrawal for your HBP in 2020, you will need to buy your payment's amount in RRSP in the year 2022. You will then include this RRSP as repayment in your 2022 tax return which you will be filing in the calendar year of 2023. Yes, it can be confusing but look at the tax return you are filing right now. It is for the 2021 taxation year but you are filing it in 2022.
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