Determining when your social security becomes taxable is based your combined income. Therefore, once your income level exceeds the floor amount, your Social Security starts to be taxed. So for example, as a single person, the threshold floor is $25,000 of combined income. Combined income for this purpose is defined as your adjusted gross income + nontaxable interest + 1/2 of your Social Security Benefits. As your combined income increases over the floor amount, the greater the percentage of you social security will become taxable. For a single person, at $34,000, 85% of you social security benefit will be taxable. For more information, please go to https://www.ssa.gov/benefits/retirement/planner/taxes.html
To determine the the actual effects on your withdrawal, please use the TurboTax Estimator, you will be able to see how the withdrawal will effect your taxes.
