I need to correct the social insurance # in 2018, 2019, 2020. It carried through to all 3 years and it is wrong

Thank you for choosing TurboTax.

You can't change the SIN in a return that's been paid for. Instead:

1. Sign in to TurboTax and select the Copy link underneath your return in Return Manager.
2. Open the copied return.
3. Select Find in the upper right corner.
4. Type Personal and select Go.
5. Change your SIN and select Continue.
6. Call us to transfer the payment from your first return to the new copy. Here's how to reach us: Contact Us