A widow receives a $500,000 life insurance death benefit, which is generally tax-free, but the $10,000 interest earned on it is taxable and can increase Medicare Part B and D premiums. Medicare uses modified adjusted gross income (MAGI) to set premiums, and taxable interest can push income above surcharge thresholds. Filing single reduces income limits, but a spouse's death may allow an appeal to adjust premiums based on current income. Beneficiaries should consider payout timing and interest impact on taxes and Medicare costs.