I recall the first year my wife and I filed a joint return. I was a graduate student with a part-time job. She was fresh out of nursing school and employed at a local hospital. When we prepared our tax return, we owed $400. That was a lot of money in 1970, especially for people in our situation. What happened? We were victims of having multiple sources of income between the two of us and did not have the correct amounts withheld from our incomes.