Article Highlights: What Is AMT? AMT Triggers Medical Deductions Deduction for Taxes Paid Home Mortgage Interest Miscellaneous Itemized Deductions Personal Exemptions Standard Deduction Incentive Stock Options Although Congress has been promising to repeal the alternative minimum tax (AMT), they failed to do that when they passed tax reform in 2017. Instead, they lessened the effects of the AMT by increasing AMT exemptions (an amount of income exempt from AMT taxation) and raising the income thresholds for when the exemptions are phased out. These two steps and some other changes covered below lessen your chances of being hit by the AMT, but it is still there, so it is wise to be aware of how the AMT is determined and the things that might trigger it. There are two ways to determine your tax: the regular way, which most everyone is familiar with, and the alternative method. Your tax will be the higher of the two. So, what is the alternative tax and why might you get hit with it? Well, many, many years ago, Congress, in an effort to curb tax shelters and tax preferences of wealthy taxpayers, created an alternative method for computing tax that disallows certain deductions and adds preference income and called it the AMT. Although originally intended to apply to the wealthy, years of inflation caused more than just wealthy taxpayers to be caught up in the tax. What Triggers the AMT? The list of tax deductions and preferences not allowed when computing the AMT is substantial and, at times, complicated. However, the typical taxpayer does not encounter most of them. In the past, the seven following items routinely caused taxpayers to be hit by the AMT. As you will note, tax reform has lessened or eliminated the impact of some of these. Medical Deductions – For many years, medical deductions were allowed to the extent they exceeded 7.5% of a taxpayer’s income for regular tax purposes and 10% for the AMT computation. The 2.5% difference was one of the items that added to the AMT tax. (For 2013 through 2016, the percentage for taxpayers under age 65 was 10% for both regular tax and AMT, and they had no AMT adjustment.) For 2017 and 2018, tax reform made the medical limit 7.5% for both regular and AMT purposes. After 2018, the percentage of income that reduces medical expenses will be 10% for both regular tax and AMT. Therefore medical expenses also will not impact the AMT in 2019 and later years. Deduction for Taxes Paid – When itemizing deductions on a federal return, a taxpayer is allowed to deduct a variety of state and local taxes, including real property, personal property, and state income or sales tax. But, for AMT purposes, none of these taxes is deductible, thus creating an AMT adjustment. However, tax reform imposed a $10,000 limit on state and local tax deductions, lessening the difference in the regular tax and AMT adjustment, especially for higher income taxpayers and those living in states with high taxes. However, when combined with other triggering items, the state and local taxes deducted for regular tax can still create an AMT. Home Mortgage Interest – For both the regular tax and AMT computations, interest paid on a debt to acquire or substantially improve a main home or second home is deductible as long as the $1 million debt limit ($750,000 for loans incurred after 2017) isn’t exceeded. Prior to 2018, for regular tax purposes, the interest on up to $100,000 of equity debt on first and second homes was also deductible, creating a difference between the regular tax and AMT deduction, as equity debt interest is not allowed for AMT purposes. Additionally, interest on debt to acquire a motor home or boat that is used as a taxpayer’s home or second home is deductible for regular tax purposes but not for AMT purposes. Starting in 2018, tax reform no longer allows homeowners to deduct the interest on equity debt, which eliminates another difference between what is deductible for regular tax and the AMT and reduces the chances of being saddled with the AMT. Miscellaneous Itemized Deductions – The category of miscellaneous deductions, which includes employee business expenses and investment expenses, is not deductible for AMT purposes. For certain taxpayers with deductible employee business expenses or high investment advisor fees, this has created a significant AMT. Here again, tax reform has eliminated these same miscellaneous deductions for regular tax beginning in 2018, thus eliminating another difference between the AMT and the regular tax computation. Personal Exemptions – Through 2017, a deduction for personal exemptions was allowed for regular tax but not for the AMT, creating a difference in the computation and adding to the chance of being subject to the AMT. As of 2018, exemptions are no longer allowed for regular tax, which eliminates yet another difference. Standard Deduction – For regular tax purposes, a taxpayer can choose to itemize their deductions or use the standard deduction. However, for the AMT, only itemized deductions are allowed. Tax reform substantially increased the standard deduction used to figure regular tax, and this can increase chances of being affected by the AMT. There is a strategy that can be used to mitigate the AMT for taxpayers who would normally use the standard deduction, which is forcing itemized deductions even if they total an amount that is less than the standard deduction amount. Even the smallest of charitable deductions will benefit at a minimum of 26% (the lowest bracket for the AMT). This strategy is tricky and best left to a tax professional to figure out. Exercising Incentive Stock Options and Holding the Stock – Many employers offer stock options to their employees. One type of option is called a qualified or incentive stock option. The taxpayer does not recognize income when the options are exercised and becomes qualified for long-term capital gain treatment upon sale of the stock acquired from the option if the stock is held more than a year after the option was exercised and two years after the option was granted. However, for AMT purposes, the difference between the option price and the exercise price is AMT income in the year the option is exercised, which frequently triggers an AMT tax when large blocks of stock are exercised. Tax reform did not change this provision.