Provided that you proceed through TurboTax in sequence by clicking Continue each time it appears, TurboTax does ask the necessary questions to determine the taxable amount of a distribution reported on a Form 1099-SA.
To make a code-1 or code-3 Form 1099-SA nontaxable, when asked by TurboTax you must indicate that the distribution was used for qualified medical expenses or was rolled over to another HSA or MSA, whichever applies.
If you received a code-2 Form 1099-SA, the amount shown in box 2 is taxable.
If you received a code-4 or code-6 Form 1099-SA, the amount that is taxable is reduced by the amount of the decedent's pre-death expenses that you paid within the one-year period following the date of death, which you must enter when TurboTax asks.
I'll page a knowledgeable person in this area, @dmertz but you may have to contact Support:
Provided that you proceed through TurboTax in sequence by clicking Continue each time it appears, TurboTax does ask the necessary questions to determine the taxable amount of a distribution reported on a Form 1099-SA.
To make a code-1 or code-3 Form 1099-SA nontaxable, when asked by TurboTax you must indicate that the distribution was used for qualified medical expenses or was rolled over to another HSA or MSA, whichever applies.
If you received a code-2 Form 1099-SA, the amount shown in box 2 is taxable.
If you received a code-4 or code-6 Form 1099-SA, the amount that is taxable is reduced by the amount of the decedent's pre-death expenses that you paid within the one-year period following the date of death, which you must enter when TurboTax asks.
If you have not filed, go back through the interview and make sure you answer all the questions. You can add more details here if you need followup advice.
If you already filed, and just noticed you paid tax on a withdrawal that should be non-taxable, you can file an amended return to correct the problem and get a refund.