For 2012, the AMT exemption levels for the various tax statuses are as follows:
Single and Head of Household $50,600
Married Filing Joint and Qualifying Widow(er) $78,750
Married Filing Separate $39,375
If your taxable income, based on filing status, is greater than the AMT exemption levels listed above, you may have to pay the AMT rather than the amount of tax based on your income less your deductions.
Seeing as there are different rules used when calculating the AMT, we strongly recommend you utilize a professional tax preparer to complete your returns. A seasoned tax professional will be able to help you calculate the tax levels correctly, possibly saving you money.