The stimulus payments are based on the 2020 tax return that you haven't filed yet. If you don't get either the first or second payments because your 2019 return shows that you can be claimed as somebody else's dependent, you can claim the Recovery Rebate Credit when you file your 2020 taxes and it will provide the same amount of payment as the stimulus would have. TurboTax will guide you through this when you prepare your return. But amending your 2019 return won't help you get a payment any earlier, and you'll need to wait until you file your 2020 return to receive the money.
You can reach the IRS at 800-829-1040 if you need to discuss your prior year returns.
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