She may use your earned income to make an IRA contribution as long as she has not reached age 70½ during the tax year. She may make a contribution up to $5,500 ($6,500 if over age 50) or your taxable compensation, whichever is less. For tax year 2015, you may deduct her contribution as long as your joint adjusted gross income is less than $183,000. Between $183,000 and $193,000 the amount deductible phases out to zero. See the instructions for either Form 1040 or 1040A for a work sheet you can use to compute the amount that is deductible.