I have the same problem as ljin011 using TurboTax Premier Desktop for Mac and filing a married filing jointly return. The problem is very simple to replicate. Just try $2M, $3M, $4M, upto $9M as the taxable income on line 19 of form 540. You will see that the tax on line 31 goes up by $130,708 for each $1M in income. This means that TT is using 13.0708% as the marginal rate. The top marginal rate for CA is 12.3%, so the calculation is clearly incorrect
