For self-employment income earned in 2013 and 2014, the self-employment tax rate is 15.3%. The rate consists of two parts: 12.4% for social security (old-age, survivors, and disability insurance) and 2.9% for Medicare (hospital insurance).
A seedbed is a plot of garden set aside to grow vegetables seeds, which can later be transplanted. seedbed is a plot of garden set aside to grow vegetables seeds, which can later be transplanted.
A seed the fertilized embryo of a plant that is encased in a  protective covering (the testa) and surrounded by a food supply  (the cotyledon - monocotyledonous plants or cotyledons -  dicotyledonous plants).