The Alternative Minimum Tax frequently is described as a “separate” or “parallel” tax system in an attempt to distinguish it from the “Regular” tax system that applies to all other taxpayers. But there really is only one tax system in the U.S. – our Internal Revenue Code – that applies to everyone. This article will illustrate how both the AMT and the Regular tax calculations follow the same common principles of taxation, as a useful starting point in understanding the individual AMT items that will be explored in future articles.
Here are the basic income tax concepts:
- we pay taxes on a number that we calculate that is known as “taxable income”
- we arrive at taxable income by adding up our various sources of income and then subtracting a certain allowable number of deductions
- not all income is subject to tax
- little of what we spend each year may be taken as a tax deduction
- we then apply the appropriate income tax rate to our taxable income
- the result then is each of our individual shares of the national tax burden.
These basic concepts apply both for the AMT as well as for the Regular Tax, with differences in the individual components of the computations:
- on the income side, more is taxed under the AMT than under the Regular Tax
- on the deduction side, fewer are allowed under the AMT than under the Regular Tax.
The real “hit” from the AMT is that the tax that ultimately is due is the greater of the AMT or the Regular Tax. This is just the way the tax law works.
Most of the AMT hit comes from the deduction side – deductions that an individual is allowed to take for the Regular Tax but is not allowed to take for the AMT. Some deductions are not allowed at all for the AMT, while others are allowed, but to a lesser degree. The Regular Tax deductions that are not allowed at all for the AMT are:
- the standard deduction
- the deduction for personal exemptions
- the itemized deduction for state and local taxes
- interest on certain second mortgages and home equity lines of credit
- miscellaneous itemized deductions
The Regular Tax deductions that are allowed, but to a lesser extent for the AMT are:
- the itemized deduction for medical and dental expenses
- many business expenses such as depreciation, depletion, and research expenses, among others
On the income side, there are fewer differences. The more significant ones are:
- tax-exempt bond interest that is from a “private activity bond”
- income from the exercise of an “incentive stock option” (“ISO”)
- state income tax refunds
It is important to note that tax planning opportunities exist for each and every one of these AMT items. Each one is different, of course, but AMT planning generally can be grouped into the following categories:
- payment of expenses that are AMT items in one year versus another
- choice of a different investment strategy in terms of stocks, bonds, etc.
- choice of a different financing strategy when taking out a loan
- choice of a different business accounting method
Certain AMT items cannot be avoided (property taxes for homeowners, for example), but because income and deductions and tax rates do not remain static from year to year, the AMT frequently can be reduced simply by moving an AMT item like property taxes into a different year. Other AMT items may be eliminated in part or in full if they are covered by one of the other tax planning strategies listed above.
The essence of AMT planning is to 1) first determine which items are causing the taxpayer to fall into the AMT, and then 2) take the appropriate action to lessen, if not eliminate, the effect of each item. All of the AMT-reducing planning opportunities will be individually explored in future articles.

