If you're curious why, it's because of the California itemized deduction phase-out, line 29 in the instructions below [1].
CalFile only cares about handling "simple" items. Other notable exclusions [2] are capital gains, health savings accounts, Schedule C, Schedule E, and Roth IRA conversions and distributions.
FWIW I've used calfile with capital gains and it worked fine, I was able to file properly and it gave me the same numeric results as TurboTax. HSA gains/dividends can also go in with your regular income, since California doesn't recognize them with any sort of special tax treatment.
One of the calfile devs shows up on HN every once in a while. I got the feeling that the real impediments were more bureaucratic than on the technical or accounting side of things.
One of the calfile devs shows up on HN every once in a while. I got the feeling that the real impediments were more bureaucratic than on the technical or accounting side of things.