Group 1 - The article discusses the components of taxable income for retirement, specifically focusing on Social Security, pension, and 401(k) withdrawals [2][3][4] - It highlights the importance of calculating "combined income" to determine the taxable portion of Social Security benefits, which includes adjusted gross income, tax-exempt interest, and half of Social Security benefits [5][6] - The article outlines income thresholds that affect the taxation of Social Security benefits, indicating that up to 50% may be taxable for combined incomes between $25,000 and $34,000, and up to 85% for incomes exceeding $34,000 [7]