A married couple, filing jointly, has an adjusted gross income (AGI) of $40,000, receives $5,000 in tax-exempt interest, and collects $30,000 in Social Security benefits. Based on the IRS formula for determining taxability, what portion of their Social Security benefits is subject to federal income tax?
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A
None of the benefits are taxable.
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B
Up to 50% of the benefits are taxable.
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C
Up to 85% of the benefits are taxable.
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D
The entire amount of the benefits is taxable.