Most income reported on Form 1099-R, whether is is an IRA, a company pension, a 401K, an annuity, etc. are all taxable income on your return.
This is because most of these were pre-tax contributions, so they are taxed coming out, and they are all taxed at the same rate.
The only difference would be in the case where you made after-tax contributions to a retirement fund, and in that case, the non-taxable amount is shown in Box 5 on the 1099-R.
When entering your 1099-R, TurboTax specifically asks if the 'IRA' box is checked on your 1099-R. This is because some rules for rollovers/conversions, etc. are different for IRA's, and not because they are taxed differently.
So on your Form 1040, amounts for your retirement income will show on Lines 4a or 5a, and taxable amounts (usually same amounts) on 4b and 5b, and they are taxed the same.
You can review your entries in the 1099-R section to check your answers to the 'IRA box checked' question, but in the net out, income effects are the same either way.
Here's more info on Distributions Reported on Form 1099-R and Tax Tips in Retirement.
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