Your amended return will take up to 3 weeks after you mailed it to show up on our system. Processing it can take up to 16 weeks. If you owed the IRS on an amended return, you should pay the amount shown on the amended return when you filed the return.
https://www.irs.gov/filing/wheres-my-amended-return
You can pay any taxes due the IRS on their website. See the following:
https://www.irs.gov/payments
