It's not an inheritance, because she's alive.
Your mother MAY need to file a federal gift tax return. She can give $14,000 per person ($28,000 if she gave two SEPARATE gifts, one to you and one to your wife) or after January 1, 2013 with no return needed. (The figure was $13,000 if this happened in 2012).
Unless the gifts were very large even if a return is needed there may not be a tax. Consult your CPA if the per person gift exceeded the amount listed.
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It's not inheritance if the person is still alive. Consult a CPA to determine the most advantageous tax treatment at this point. Doing so BEFORE she gave you the proceeds would have been a good idea.
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I agree with attorney Ashman. You receive an inheritance after someone dies. What you received is a gift, subject to gift tax by the donor (your mother-in-law) for amounts in excess of the yearly exemption.
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In addition to the possible need to file a gift tax return, if your mother-in-law sold her house for more than a $250,000 gain, she will owe income tax on the excess of the proceeds over that amount.
This is a gift not an inheritance. Any federal gift tax is an issue for the donor (your mother). Georgia does not have a gift tax. Gift tax would only apply if the amount exceeded lifetime total of 5.25M. If your mother gifted more than 14K to anyone individual, she would have to file a gift tax return (Form 709) when filing her income tax return. Failure to file penalties are based on the tax due, so if her total gifts over her life are less than $5.25M then no penalties or tax even if the return is filed late.
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