In general, if you have already filed and you need to include additional income or make a change to your return, then you will need to file an amended return. If for some reason the IRS does not accept your filed return, then you can make the addition or change before it is resubmitted.
If your return is accepted by the IRS and your Form 1099-G is reporting income from unemployment, then you will need to complete an amended return to include that income.
If your Form 1099-G is reporting a state tax refund for your 2019 return which you received in 2020, then an amended return may not be necessary. If you used the standard deduction on your 2019 Federal return, then the state tax refund will not be taxable on your 2020 return and you would not need to amend your return.
Keep the following TurboTax article handy for reference. As the tax season progresses, the links will be updated with the instructions for amending your return that has already been filed.
How to amend (change or correct) a return you already filed
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
