Most likely you entered his W-2 as belonging to you. Go back and update the W-2 section under federal Taxes, Wages and Income. Edit the W-2 in question. Right at the top, above Employer Information ir shows in orange "This w-2 belongs to" with checkmark for Taxpayer or Spouse . This choice refers to the person listed first on the return (TP) and the person listed second as Spouse (SP). You probably need to correct that.