To determine whether any amount of your social security benefits will be taxable, you add 50% of your benefits to your other income and if this sum exceeds $25,000 then a portion of your benefits will be taxable. Because your other income is so high, 85% of your social security benefits will be taxable.
http://www.irs.gov/newsroom/article/0,,id=179091,00.html
See page 5 - http://www.irs.gov/pub/irs-pdf/p915.pdf
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