https://ttlc.intuit.com/community/state-taxes/discussion/2024-california-deduction-wrong/01/3706753#M181939 <P>According to the California Franchise Tax Board, my turbotax generated California itemized deduction is off by about 14%, meaning I now owe additional taxes and penalties.&nbsp; Unfortunately, when I contacted FTB, they couuld not provide any meaningful insight as to why the calculations were so far off.&nbsp; Their only suggestions was to hire a CPA to understand the problem -- not that this would reduce the taxes, but that they would explain the discrepancy.&nbsp; I don't think going over the numbers myself would make any difference as I've already double and triple checked the numbers and going over them yet another time won't fix anything unless I know what I did wrong in the first place.&nbsp; My normal process is to enter everything in the federal forms and do several verification passes.&nbsp; Then for California, I just go with default for everything as I don't have anything beyond normal 1099-INT, DIV, B and the occasional K-1.</P><P>&nbsp;</P><P>So my question is: what are things that are different between CA and Fed that TurboTax might not know about or that I might have gotten wrong?&nbsp; This is the first time I've had this problem.&nbsp; Should I just hire a CPA next year?&nbsp; The discrepancy is resulting in additional taxes and penalty in the amount of over $3k.</P> Mon, 13 Oct 2025 18:51:05 GMT gtchen66 2025-10-13T18:51:05Z https://ttlc.intuit.com/community/state-taxes/discussion/2024-california-deduction-wrong/01/3706753#M181939 <P>According to the California Franchise Tax Board, my turbotax generated California itemized deduction is off by about 14%, meaning I now owe additional taxes and penalties.&nbsp; Unfortunately, when I contacted FTB, they couuld not provide any meaningful insight as to why the calculations were so far off.&nbsp; Their only suggestions was to hire a CPA to understand the problem -- not that this would reduce the taxes, but that they would explain the discrepancy.&nbsp; I don't think going over the numbers myself would make any difference as I've already double and triple checked the numbers and going over them yet another time won't fix anything unless I know what I did wrong in the first place.&nbsp; My normal process is to enter everything in the federal forms and do several verification passes.&nbsp; Then for California, I just go with default for everything as I don't have anything beyond normal 1099-INT, DIV, B and the occasional K-1.</P><P>&nbsp;</P><P>So my question is: what are things that are different between CA and Fed that TurboTax might not know about or that I might have gotten wrong?&nbsp; This is the first time I've had this problem.&nbsp; Should I just hire a CPA next year?&nbsp; The discrepancy is resulting in additional taxes and penalty in the amount of over $3k.</P> Mon, 13 Oct 2025 18:51:05 GMT https://ttlc.intuit.com/community/state-taxes/discussion/2024-california-deduction-wrong/01/3706753#M181939 gtchen66 2025-10-13T18:51:05Z https://ttlc.intuit.com/community/state-taxes/discussion/re-2024-california-deduction-wrong/01/3706759#M181941 <P>Hard to speculate since we can’t see your return. Might be a good idea to have a professional tax preparer look at your return. &nbsp;</P> Mon, 13 Oct 2025 19:35:12 GMT https://ttlc.intuit.com/community/state-taxes/discussion/re-2024-california-deduction-wrong/01/3706759#M181941 Bsch4477 2025-10-13T19:35:12Z