
Answer:
                           Smiths ($)   Millers ($)
Salary (earned by one spouse) Â Â $30,000 Â Â Â Â $95,000
Taxable interest income        $20        $1,000  Â
Gross Income                 $30,020     $96,000
Less: Deductible IRA Â Â Â Â Â Â Â Â Â Â $0 Â Â Â Â Â Â Â Â Â $6,000 Â
Contribution
Adjusted Gross Income (AGI) Â Â Â $30,020 Â Â Â Â $90,000
Less: Itemized Deductions       $900       $26,400
Taxable Income               $29,120      $63,600
Tax as per tax brackets         $3,106       $7,244
Withholding                   $750        $8,500
Tax due or (refund due) Â Â Â Â Â Â Â Â $2,356 Â Â Â Â Â Â ($1,256)
Workings on Tax as per tax brackets
Smiths
($19,400 * 10%) + [($29,120 - $19,400) * 12%]
= $3,106 Â
Millers
($19,400 * 10%) + [($63,600 - $19,400) * 12%]
= $7,244