@pvwedding
Items that can be included in the adjusted cost basis are listed in IRS publication 523 beginning on page 8.
https://www.irs.gov/pub/irs-pdf/p523.pdf
Sometimes TurboTax is not clear on this. Depending on what version of the program you are using and what section you are working on, you can be asked for your cost when the program should be asking for your adjusted cost basis. In other sections of the program, there is a calculator to help you calculate your adjusted cost basis, but it may not list all the eligible items. If you can calculate your own adjusted cost basis, you should use that.
