I think you are trying to determine the amount of your social security benefits that are not subject to federal income tax. If so, it would be the amount listed on line 6 of your Form 1040 (social security benefits) less the amount listed on line 6(b) (taxable social security benefits).
To view your form 1040 and schedule 1 to 3:
- Choose Tax Tools from your left menu bar in TurboTax Online
- Choose Tools
- Choose View Tax Summary
- See the Preview my 1040 option in the left menu bar and click on it
- Choose the Back option in the left menu bar when you are done
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