In GvHD, the donated bone marrow or peripheral blood stem cells view the recipientâs body as foreign, and the donated cells/bone marrow attack the body. There are two forms of GvHD: 1  Acute graft versus host disease (aGvHD).
Self-employment tax is a tax consisting of Social Security and Medicare taxes primarily for individuals who work for themselves. It is similar to the Social Security and Medicare taxes withheld from the pay of most wage earners. You figure self-employment tax (SE tax) yourself using Schedule SE (Form 1040). Social Security and Medicare taxes of most wage earners are figured by their employers.
If you're employed, your employer pays for part of your Social Security and Medicare taxes, but as your own boss, you pay it all. In 2013, the IRS reports the rate is 12.4 percent for Social Security and 2.9 percent for Medicare, making a total of 15.3 percent self-employment tax. Since the IRS requires taxes to be paid at the time the income is earned, you may be subject to a penalty if you do not pay enough by the due date each quarter.