My W2 income is $9,000. Turbotax is saying my wife

When I tried to enter $7,000 for my Roth IRA and $2,000 for my wife's Roth IRA, TurboTax said our combined earned income was only $7,940 and we would be penalized for any contribution she makes to a Roth IRA over $940. Why is the amount lower than my income and how does TurboTax figure our combined earned income?