If you are amending your return to add income from Schedule K-1, then it is normal that the taxable portion of the Social Security benefits you previously entered may also change.
Whether or not your Social Security income is taxable depends on your total income, including your Social Security plus any other income.
See this help article for more information regarding the taxability of Social Security income. TurboTax will calculate the taxable amount when you input all of your income.
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