If I ammended my state taxes, would that postpone my federal return?

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No, amending your return state will not postpone your federal refund. The identity of Original returns and amended returns remain separate (dispite where they originate from).  

Reminder: Wait to submit your amended return until after your original return is approved.

Amended returns must be mailed. If a refund is due, it will be delivered on a paper check.

You can track your amended return 3 weeks after you mail your amendment using the IRS tracking system.

It may take up between 12-16 weeks to receive your amended refund.

To track the status of your amended return use the IRS link below or by call 866-464-2050. 

https://www.irs.gov/filing/individuals/amended-returns-form-1040-x/wheres-my-amended-return-1