Please see the following from a TurboTax FAQ on how to resolve error TT600:
TT600 errors, including TT600, TT601, TT602, TT603, AND TT604, are
typically validation errors. This means you may have entered
something into your return that TurboTax cannot understand or has not
been programmed to accept.
The most common example is:
- Quotation marks, ampersands and other special characters in any
fields that accept text, such as your name, address, your dependant’s
names, etc.
Unfortunately, the errors don’t provide much context as to where the error is. In all cases, technical support should be contacted if you encounter a TT600 error.
So, if you’re getting a TT600-series error, please call us.