As implied by DanaB27's answer, if entering a Roth IRA contribution into TurboTax increases your balance due, it means that it is being treated by TurboTax as an excess contribution. An excess contribution can result from not having sufficient compensation entered into TurboTax to support the contribution, entering a contribution of more than the overall annual limit, or modified AGI for the purpose being above the amount where that amount of Roth contribution is permitted.
Make sure that you are not entering as Roth IRA contributions any amounts shown in box 12 of your W-2. Amounts shown on box 12 of your W-2 are not Roth IRA contributions and are to be entered into TurboTax only in box 12 of TurboTax's W-2 form.
