Information about denying livelihood
The tax office is requesting from us a statement for 2009, stating from which sources we cover our cost of living. In our 2009 income tax return, we did not declare any income as there were no earnings. However, due to a business operated by the wife until April 13, 2009, we were obligated to submit the tax return.
It is important to note that since 2009 we have been living abroad and paying taxes on our income there, therefore we did not declare these foreign earnings in the German income tax return. We still maintain a German residence and bank account.
Do we need to respond to the tax office's inquiry, and if so, do we need to declare these foreign earnings, which are already properly taxed abroad? We can prove that we have no expenses in Germany (living with parents, no car, no telephone connection, no mobile phone, etc.) as we have bank statements, so do we need to provide any further proof?
How should our response to the tax office be legally correct?