@jennyebean The calculation is fairly simple, so it is unlikely that TurboTax did not calculate it properly. However, since TurboTax guarantees the accuracy of their calculations, you can submit an accuracy guarantee claim to TurboTax and they will investigate and refund any interest or penalties you incur as a result of a bad calculation in TurboTax. Here is a link to submit a claim:
https://ttlc.intuit.com/community/charges-and-fees/help/how-do-i-submit-a-claim-under-the-turbotax-1...
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