How much a married couple has to make to pay taxes?

For the 2009 tax year a married couple filing a married filing joint income tax return both under the age of 65 filing a 1040 federal income tax return could have 18700 of adjusted gross income free of federal income tax after the 1040 federal income tax return is completed correctly and completely to the 1040 page 2 line 43 TAXABLE INCOME AMOUNT -0- ZERO.