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Registered Pension Plans (RPPs) affect your RRSP contribution limit.
In your T4 slip, it includes a pension adjustment (PA) amount. The PA reduces your RRSP contribution room, allowing you to contribute less for the current tax year.
Based on the information u shared, your contribution limit for the tax 2020 will be $10,000.
You can find more detailed information about RRSP and RPPs in a link How do contributions to a pension plan affect RRSP