TurboTax program has innate function with which users may export their tax return files (most often .tax) as PDF documents, which is what tax to pdf conversion usually represents. The same can most likely be also achieved with the print function in case a virtual PDF printer is installed on the computer.
In any case a lot of people are searching just for a way to print their tax formats to PDF. For this you just have to look for some sort of PDF export function in your tax preparation file.
Open TAX file Open PDF file