I filed my child on the wrong year and had to amend. The amendment was accepted. How do I know if there are penalties?

[jtrumble17617]

My ex and I claim our child every other year. I accidentally reversed it two years in a row so I amended this year and last. It looks like I broke even but how do I check for penalties?

[DoninGA]

If there are any penalties the IRS will send you a bill in the mail.