You would need to provide more information and have a better understanding of what exactly the IRS changed on your return. The IRS frequently uses the term "calculation error" generically when they change something.
And the "error" did not cost you anything.
You can contact customer support to discuss it.
To call TurboTax customer support
https://ttlc.intuit.com/questions/1899263-what-is-the-turbotax-phone-number
They are available from 5 a.m. to 5 p.m. Pacific time Monday - Friday.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
