Your worldwide income is subject to U.S. income tax, regardless of where you reside.
Not true. If you reside somewhere else and earn income somewhere else, the US has no authority to tax you. You seem to think the US has some kind of taxing power that enables them to go all over the world taxing people in different countries because they happen to be US citizens. They don't.
Your taxes are paid on the income you claim in the US. If I make $10 million in Germany and claim it as income in the US, then I pay taxes on it.
"Not true. If you reside somewhere else and earn income somewhere else, the US has no authority to tax you. You seem to think the US has some kind of taxing power that enables them to go all over the world taxing people in different countries because they happen to be US citizens. They don't."
LOL
US Federal Tax Liability: Expat Tax USA
When moving overseas, one of the biggest questions many have concerns Expat Tax. Unfortunately, America is one of a handful of countries that vigorously pursues taxes worldwide – so don’t expect to avoid a U.S. tax debt by moving overseas. As a matter of fact, you’re not even allowed to give up your U.S. citizenship to eliminate a tax obligation.
Be aware that America has tax treaties with over 42 countries where the IRS and the foreign tax agencies exchange tax data on their residents.
Many Americans think because they’re earning money in another country – and paying that country’s taxes – they have no liability when it comes to their home country and that they are not required to pay expat tax USA. That’s totally not the case. You still should file a return with the U.S. every year, whether you have income or not. You are not legally required to do so if you don’t owe U.S. taxes, but it’s an important preventative measure as there is a Statute of Limitations on tax disputes. If there is a dispute over back taxes, you start running out the clock on the Statute of Limitations if you file. If you don’t, the IRS can conduct a personal audit at any time in the future and you’ll be liable if they decide against you.
The IRS provides a tax guide for citizens living abroad, this can be found
here. There are also some basic facts you need to know about taxation in 2012.
Tax liabilities if you are a US citizen living abroad. : Expat Info Desk
I am an American living and working abroad. Do I need to file a US tax return?
Regardless of where you live now, being a United States citizen requires that you file a yearly tax return with the IRS. Green card holders and all US citizens are required to file a US return, no matter where they live, as long as their income (earned in the US and abroad) is just over $9,000. Many people wrongly assume that because they have never owed money to the IRS, they simply don't have to file.
Earning anything over $9,350.00 does require you to file, however. The US has treaties with many foreign countries that will reduce or even eliminate actual owed tax. You cannot, however, take advantage of these benefits if you don't file.
US Taxes While Living Abroad FAQ :: American Citizens Abroad (ACA)