The IRS provides more information about this in IRS Publication 542, Corporations. Self Employment Tax. Self-employment tax is social security and Medicare tax for people who are self-employed. This tax applies to those who are sole proprietors with a net profit of $400 or more during the year.
The Mekong River originates at the Lasagongma Spring. The spring is located in the high plateaus of Tibet. It is estimated to be 4,350 kilometers long. 1 person found this useful.
It flows through the countries of China, Burma, Thailand, Laos, Cambodia, and finally Vietnam. The Mekong begins in the plateaus of Tibet, now a part of China, and flows about 2,703 miles (4,350 km) south-east to the South China Sea.