After you file

The Form 1040-V is only for and can only be used on the original tax return, not the amended return.

 

If taxes are owed on an amended return it can only be paid with a check mailed with the return to the IRS or use the IRS payment website.

If the amended return has a tax refund the refund can only be paid by the IRS sending a check in the mail to the address on the amended return.