I was able to file my federal amended return electronically with the RRC and it was accepted within an hour through turbo tax. It should ask you about the stimulus checks before final review.
You can only file federal amended returns electronically if you did your original federal return electronically. I have not been able to do my state amended electronically even though it says I’m owed a difference for the dependence status change but OH (state filed in) has a relatively easy amended process. It does state a lot longer though for paper to be processed so I have been holding off.
