Even if you are not required to register your business with the host government, you may still want to register with the . government. Remember, if you are out of the . for at least 330 days per year, you can claim in 2010 up to $91,500 of Foreign Earned Income for which you are not taxed. If your company is registered in the ., it will be easier to substantiate the origin of your income. You may also want to buy credits for your Social Security Account quarterly so that you continue to build your lifelong average income.