TurboTax does partner with Sprinttax for both federal and state 1040NR filing. You will use Form 1040X to prepare your amendment.
Only demographic information (name, address, SSN) should be entered on page 1 of the 1040-X when completing for a 1040NR. The remaining lines of the 1040X page 1, and page 2 parts 1 and 2 will remain blank. An explanation of changes should be entered in part 3. The changes are then reflected on the new or corrected 1040NR return with 'AMENDED' printed at the top of the form.
Complete the Form 1040NR as if it were the original return. Include the Form 1040X and your original 1040, also I would advise sending a statement about the stimulus payments you received. Determine if you have a balance due, break even or additional refund based on netting the results using both original 1040 and the 1040NR.
This Sprintax blog will be helpful to explain what to do with the stimulus payment you received in error.
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