These organisms are classified as a kingdom, Fungi, which is separate from the other eukaryotic life kingdoms of plants and animals. A characteristic that places fungi in a different kingdom from plants, bacteria, and some protists is chitin in their cell walls.
If you will reach full retirement age in 2015, you may earn up to $3,490 per month without losing any of your benefits. But for every $3 you earn over that amount in any month, you will lose $1 in Social Security benefits.
As if that isn't complicated enough, Social Security offers a sweeter deal in the year in which you reach full retirement age. In that year, you can make up to $40,080 without seeing your benefit reduced, and the reduction is $1 for every $3 earned over the $40,080 threshold.