It depends.
If you have filed your state returns electronically, you will also need to wait until the return is accepted.
You will then follow the same procedures to amend the state return.
As far as the state tax due, as it typically does take a while for the amended returns to be processed, I would recommend sending your payment in based upon your original return. Make sure you reflect this payment on your amended return. You will then be refunded for the difference and will avoid any potential late payment penalties that could occur if your amended return is not processed by the due date of the return as originally filed.
Steps for amending a tax return
Steps to amend a state tax return
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