Social Security benefits are taxable at highly variable rates, with the poor and the rich benefiting the most. The middle class tax burden has been doubling each ten years -- and will triple in the next decade. Why? Because this tax is not 'inflation-indexed' -- means that more and more retirees at lower levels will be sending some of their SS benefits back to the Treasury. It's a silent tax increase that keeps on growing and growing.
http://www.statesman.com/business/personal-finance/the-middle-class-tax-that-keeps-on-rising-2437978.html?printArticle=y
http://www.statesman.com/business/personal-finance/the-middle-class-tax-that-keeps-on-rising-2437978.html