What form do I file an amended return for a Form 1120-H - on a Form 1120X or a second Form 1120-H with notations on the top?

[sjrcpa · Accepted solution]

The answer is probably in the 1120-H instructions. There is usually a paragraph or two about amended returns.

[mojocpa]

Just looking at the 1120-H, there is box 4 at the top for amended return.