Two weeks ago, a few filers from Idaho reported a similar issue for Idaho state taxes (https://ttlc.intuit.com/community/taxes/discussion/salt-deduction-error/00/3745484). The published formula for the add-back for SALT to the Idaho tax forms is clear and should result in correctly adding back all the federally reported SALT back in as income for the state, but Turbo Tax is not following the formula. Two weeks ago we provided our specific data for TurboTax to investigate and correct this simple mistake, but we have not had any responses from TurboTax since then. It's frustrating TurboTax lists these state forms as finalized, but these calculation errors persist. Because of TurboTax's lack of transparency, I suspect most people will likely file not realizing there is an error that could lead to significant underpayment of state taxes.
