33 pages; For use in preparing 2025 Returns. "This publication explains the federal income tax rules for social security benefits and equivalent tier 1 railroad retirement benefits.... [It] covers ... [1] Whether any of your benefits are taxable. [2] How to report taxable benefits. [3] How much is taxable. [4] How to treat lump-sum benefit payments. [5] Deductions related to your benefits, including a deduction or credit you can claim if your repayments are more than your gross benefits."  MORE >>