Troubleshooting

The amount on Line 20800 might have gotten added if you used the Canada Revenue Agency (CRA) AutoFill my Return (AFR) service and had an Unused RRSP Contribution that was automatically entered.

To check this:

If you are using TurboTax Online, you can search for RRSP contributions on the Tax Home page. 

If you are using TurboTax Desktop in EasyStep mode, select Registered Savings Plans>Registered Savings Plans Profile from the left side menu. 

If you are using TurboTax Desktop in Forms mode, you can search for the RRSP worksheet by clicking on the Forms icon in the blue icon bar.