Filed return & arranged for IRS to withdraw tax from banking account. Realized I needed to amend and owe more. Is this amendment amount in addition to original return?

[JohnW15]

Yes -- this amount is in addition to what was on the original return.  

The refund amount (or amount due) on an amended return will be in addition to any previous refund amount (or amount due) that you received or owed on your originally-filed tax return. Please see the TurboTax FAQs below for additional information. These refer to refund scenarios, but the same logic applies to amounts owed.

How does the refund math work on amendments?

https://ttlc.intuit.com/replies/5410272

I received a refund when I filed, but now I owe taxes on the amendment. How do I handle this?

https://ttlc.intuit.com/replies/4642096