Sep 25, 2025 By Rick Novak
The Alternative Minimum Tax (AMT) is a tax system intended to ensure that taxpayers with high incomes pay at least some federal income taxes. It does this by setting an alternative minimum tax rate and applying it to taxpayers who would otherwise not have to pay income taxes. The AMT was created in the late 1960s when Congress noticed that certain taxpayers were taking advantage of deductions and credits to avoid paying federal income taxes, despite having high-income levels.
The Alternative Minimum Tax is a federal income tax system that applies to taxpayers who would otherwise not have to pay taxes due to deductions and credits. It requires them to pay a minimum amount of tax that cannot be reduced through any other means. The AMT rate has been set at an alternative rate higher than the regular income tax rates.
The Alternative Minimum Tax works by applying a predetermined minimum tax rate on taxpayers eligible for certain deductions and credits. This rate is typically higher than the regular federal income tax rates, so it serves as an additional form of taxation for those with high incomes or significant amounts of deductions and credits. To determine whether you need

The AMT's purpose is to ensure that these wealthy individuals do not use their deductions or credits to reduce their taxable incomes too much. It works because if a taxpayer’s regular tax liability (before credits, deductions, and exemptions) is lower than the AMT rate, they must pay that amount instead of the standard tax rate. This means that even if someone has a lot of deductions or credits, they could end up paying more taxes in total due to the alternative minimum tax.
It would help if you first determined your regular tax liability to determine how much AMT you owe. Then you will need to compare it to the alternative minimum tax rate. You must pay the difference as additional taxes if your regular tax liability is less than the AMT rate. For example, if your regular tax liability is $3,000 and the AMT rate is $4,000, you would owe an additional $1,000 in taxes due to the alternative minimum tax.
The AMT affects higher-income individuals but can reduce their taxable income through various deductions or credits. The taxpayers most likely influenced by the AMT include those with significant medical expenses or high state and local taxes, those with lots of dependents, and those who own expensive homes in states with high property taxes. It also impacts stock options exercised by employees needing more time to pay the associated taxes.
The AMT generally disallows some deductions and exemptions on your regular tax return. Examples include state and local taxes, real estate taxes, personal property taxes, medical expenses, and miscellaneous itemized deductions such as investment fees or unreimbursed employee business expenses. The amount of these deductions or credits you can apply to reduce your regular tax liability is not allowed under the AMT rules.
The Alternative Minimum Tax does not allow many deductions and credits to be applied on the regular tax return. If you are eligible for certain credits or deductions on your federal, state, or local returns, they cannot be considered when determining your liability under the AMT. Any refundable credits you may receive from filing your taxes will not reduce your AMT liability.

If you fail to pay the AMT when it is due, you may face several penalties. These can include late payment penalties, interest on the outstanding balance, and an extra 5% penalty if the amount remains unpaid after 60 days. Failure to pay the total amount of your AMT liability could also result in IRS collection actions such as liens and levies against your property or assets.
The alternative minimum tax can be complicated to understand and calculate. If you may owe additional surcharges due to the AMT, you must speak with a professional tax preparer or accountant who can help ensure that you are paying all that you owe.
The Alternative Minimum Tax is an essential tool the Internal Revenue Service uses to ensure that wealthy individuals cannot reduce their taxable income too much. It requires taxpayers to compare their regular tax liability with the AMT rate and then pay the difference if it is lower than the AMT rate. The AMT affects those with high incomes and significant medical expenses, dependents, expensive homes, or stock options exercised by employees.
Q: What deductions and exemptions are not allowed under the AMT?
A: The AMT generally disallows some of the deductions and exemptions available on your regular tax return, such as state and local taxes, real estate taxes, personal property taxes, medical expenses, and miscellaneous itemized deductions.
Q: How does the AMT affect my tax credits or deductions from other taxes?
A: Any credits or deductions you are eligible for on your federal, state, or local returns cannot be considered when determining your liability under the AMT. Any refundable credits you may receive from filing your taxes will not reduce your AMT liability.