Thank you for providing the code. I have reviewed your data file.
Your manual calculations were made using the short method. According to the California instructions for Form 5805:
You may use the short method only if you are a calendar-year taxpayer and either one of the following apply:
- You made no estimated tax payments or your only payments were California income tax withheld.
- You paid estimated tax on the required due dates.
You may not use the short method if either of the following apply:
- You made any estimated tax payment late.
- You answered "Yes" to Part I, Question 3.
You didn't enter any state quarterly estimated payments in the area provided in the Federal section. You entered two additional payments, both made in November.
Based on your entries. TurboTax is correctly using Worksheet II, Regular Method, and the accompanying Underpayment Statement to figure your underpayment and penalty. The calculations are correct following that method.
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