Ok, so for the form 540 you're going to enter everything the exact same as it is on the original return EXCEPT for the income that you are changing. That will change the tax due, of course, and result in form 540 showing that you are due a refund - but a smaller refund than you already received. Then you are done with form 540.
Nothing else should be changed on the 540. It should look exactly like the return that you would have filed if you had had all of your information when you filed the original tax return.
That brings you to Schedule X. Schedule X asks how much your refund is on the amended return and then how much you received originally. When you subtract the refund you originally received from the smaller refund shown on your amended 540 it will result in a negative number that is your tax due.
Schedule X also offers you the opportunity to calculate the penalty and interest amounts for the tax that you'll be paying. Since you are talking about a very small amount of income I would leave those amounts blank and submit the return with only the tax payment. That will let the California FTB calculate the penalty and interest for you and send you a bill (which they may or may not even do).
@cathiexu
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