It won't let you efile the California return until the federal return is also fileable.
You are correct that the information that you enter is not going to be entirely correct if you enter that the payment was made on April 15th. But the IRS is aware of the date that they received the payment and having them compute the penalty for you is the thing the system wants you to do. The possibility that the overall tax return will result in no penalty because of the difference in what is owed overall means that maybe you don't owe that $25 penalty. I would recommend that you change the date to April 15th and then see if you receive a bill for the $25. That's what the system is recommending as well.
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