A joint tax return does not report income separately for each spouse. It only shows the total income for both of you. You would have to go through your own records, such as your W-2s, to see what income was yours and what was your spouse's. You might also have some joint income, such as investment income from a jointly owned mutual fund or brokerage account. You will have to decide how to handle that if you are trying to determine your individual incomes.