Enter your IRA contribution (traditional [TIRA] or Roth) in TurboTax (TT). If TT determines that you are eligible for a TIRA deduction, it will put it on line 19 of Schedule 1. It will not enter a Roth contribution on any IRS forms*, but will prepare a work sheet to help you track your contributions (both Roth & TIRA).
*If TT determines that you are eligible for the Retirement Savings Contributions Credit, it will prepare form 8880 to claim the credit. The credit goes on line 4 of Schedule 3. Both TIRA & Roth contributions are eligible for the credit.
The Retirement Savings Contributions Credit (“Saver’s credit”) is very limited and is for low income people. See the table on Form 8880: https://www.irs.gov/pub/irs-pdf/f8880.pdf
Added (edited): If you make a non-deductible TIRA contribution, TT will report that on form 8606, as part of your tax return. Your "bank" (IRA custodian) will also report all contributions on form 5498. Form 5498 is only an informational form and you do not report it on your tax return.
