If your IRA contributions when originally made were treated the same on your California tax return as on your federal tax return, the California taxable amount is the same as your federal taxable amount. This means that if all of your traditional IRA contributions were deductible on both your federal and California tax returns, the entire amount of the distribution is taxable on both returns and there should be no adjustment shown on California Schedule CA Part I Section A line 4 column B or column C. Perhaps @VolvoGirl can explain how to make that happen in TurboTax.
