Pensions go on Form 1040 line 5a/b, IRA income on line 4a/b. Make sure that the income ended up on the correct line. If it ended up on the wrong line, the IRS could conclude that the income was not reported despite that it was included but on the wrong line, add it to your AGI (without subtracting it from the wrong line) which could result in an increase in the taxable amount of properly entered Social Security income, and an increase in your tax liability.
Some users of TurboTax also make the mistake of using the Simplified Method to calculate an incorrect taxable amount of pension income when the correct taxable amount is shown in box 2a of the Form 1099-R. Again, if the income needs to be added to your AGI it can result in an increase in the taxable amount of Social Security.
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