I have rent income in Germany. For 2014, I filed that income in the US with my normal tax declaration. Now I learned I should have filed that income in Germany, and in the US only mention / file the tax that I paid over there, as part of the double taxation agreement between Germany and the US. In order to avoid double taxation, I probably now need to amend my US tax declaration for 2014. Can you confirm that this is right, and if so, where I can enter taxes paid abroad?
Based on Article 6 of the Germany-US tax treaty, the rental income is only taxable in Germany. https://www.irs.gov/pub/irs-trty/germany.pdf
you would enter the income on your US tax return, but also enter it as negative income under misc. income and attach form 8833 to claim the tax treaty exemption.