I currently pay about $1200, so $3-4K is not out of the question.
If correct, that means you must have an itemized deduction of around $50,000.
$65k AGI - $50k deductions - $4k exemption = $11k taxable->1184 in taxes.
Either you have the greatest tax accountant in the world, huge property taxes or huge charitable contributions. Or else I'm just missing something.