Generally, you are covered by the nation where you have residence and you and your employer will pay social security to that nation. Under the new agreement, if your employer sends you from one country to work for that employer or an affiliate in the other country for five years or less, you will continue to be covered by your home country and you will be exempt from coverage in the other country. For example, if a U.S. company sends an employee to work for that employer or an affiliate in the Czech Republic for no more than five years, the employer and the employee will continue to pay only U.S. Social Security taxes and will not have to pay in the Czech Republic. See the table below for a quick comparison.