If you are retired and have social security, you may still have to pay some taxes on these benefits.  See this IRS tip, which includes the limitation amounts to help determine quickly if you may have to pay taxes on benefits:

http://content.govdelivery.com/accounts/USIRS/bulletins/f368d0?reqfrom=share

There may be other factors, like if you itemize or have additional income, that will change the factors that determine social security taxability.  If you have your return professionally done, it is best to talk to your preparer – they can quickly determine if you owe taxes on the benefits.

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