You will need IRS form 2555 - you can check for the entry with foreign pension. Then you will need to calculate what part of your pension may or may not be deductible - for that you will want to look up the "tax treaty" between the USA and the foreign pension. My interest was in Ireland and the tax treaty came right up and was very readable. Be aware that form 2555 has several pages to complete - pay attention to detail.
