Once the return is accepted, if you wish to begin amending the return, follow these steps:
- With your tax return open after having filed the return, you will be at Tax Home.
- Scroll down to Your tax returns & documents and Show.
- Select Amend(change) my return and follow the prompts.
For more details, see: How do I amend my 2020 TurboTax Online return?
Amending 2020 electronically is available. However, unless you live in Georgia, Michigan, New York, or Vermont, any state amended return must be paper filed.