Taxed for WorldWide income means that you will have to declare any money earned in any country of the world.... if you paid taxes on it in a country outside the US and the US has a tax treaty with that country you can claim a Foreign Tax Credit, so you dont get taxed twice.... If you did earn income in another country you can claim Foreign Income Exclusion up to $87,500 (see IRS Publication 54)
Do I have to meet the 330-day presence test or have a valid working resident visa to meet the requirement for foreign income exclusion?To claim the foreign earned income exclusion, the foreign housing exclusion, or the foreign housing deduction, you must have foreign earned income, your tax home must be in a foreign country, and you must be one of the following:
A U.S. citizen who is a bona fide resident of a foreign country or countries for an uninterrupted period that includes an entire tax year,
A U.S. resident alien who is a citizen or national of a country with which the United States has an income tax treaty with a nondiscrimination article in effect and who is a bona fide resident of a foreign country or countries for an uninterrupted period that includes an entire tax year, or
A U.S. citizen or a U.S. resident alien who is physically present in a foreign country or countries for at least 330 full days during any period of 12 consecutive months.
http://www.irs.gov/publications/p54/index.htmlForget about any money he made while living in another country, just start with what he made here and file a joint return. The IRS is bad but not like USCIS. The IRS is only going to care about what he made while working here.
There is also a very good section to help you decide if you want to be resident or non-resident....
Nonresident Alien Spouse Treated as a Resident If, at the end of your tax year, you are married and one spouse is a U.S. citizen or a resident alien and the other is a nonresident alien, you can choose to treat the nonresident as a U.S. resident. This includes situations in which one of you is a nonresident alien at the beginning of the tax year and a resident alien at the end of the year and the other is a nonresident alien at the end of the year.
If you make this choice, the following two rules apply.
You and your spouse are treated, for income tax purposes, as residents for all tax years that the choice is in effect.
You must file a joint income tax return for the year you make the choice.
This means that neither of you can claim tax treaty benefits as a resident of a foreign country for a tax year for which the choice is in effect.
You can file joint or separate returns in years after the year in which you make the choice.
http://www.irs.gov/publications/p54/ch01.html#d0e1278Hope this helps
Kez