<prompt> Human: Credit Karma Tax made a serious error in filling out the California Schedule CA form, and copying it over to the 540. It transferred the wrong number to the form. I got a letter from the California revenue office, and a lower refund than I was expecting. When I messaged Credit Karma, they said it was a known bug that affected very few customers uh, California is the largest state.Bottom line, dont use Credit Karma! You get what you pay for  <response>: I filled everything out in TaxAct and Credit Karma. CK isnt quite there yet and didnt handle my investments particularly well, but all in all was only a couple bucks off from TaxAct. 