What is the Alternative Minimum Tax (AMT)?

The Alternative Minimum Tax (AMT) is a separate, parallel tax system that runs alongside the regular federal income tax system. It was designed to ensure that high-income taxpayers, who might otherwise use various deductions, credits, and loopholes to significantly lower their tax bills, pay at least a minimum amount of tax. If a taxpayer's liability under the AMT rules is higher than their regular tax liability, they must pay the difference as AMT.

How is the AMT Calculated?

Calculating the AMT involves a separate set of rules where certain deductions allowed under the regular tax system are added back to your income. The process is as follows:

1. Start with Adjusted Gross Income (AGI).
2. Add back specific deductions and income items. The most common adjustment is for the State and Local Tax (SALT) deduction, which is limited to $10,000 for regular tax but is not deductible at all for AMT. Other adjustments include income from incentive stock options (ISOs) and tax-exempt interest from certain private activity bonds.
3. Subtract the AMT exemption. The IRS provides a generous exemption amount, but it phases out for higher-income individuals.
4. Apply the AMT tax rates. A two-tiered system of 26% and 28% is applied to the resulting income.
5. Compare and pay. If this "tentative minimum tax" is higher than your regular tax liability, you pay the difference.

Frequently Asked Questions (FAQ)

Who is most likely to pay the AMT?

While originally aimed at the very wealthy, the AMT can affect a broader range of taxpayers. You are more likely to be subject to the AMT if you:

• Have a high income (generally over $200,000).
• Claim large itemized deductions, especially the SALT deduction.
• Exercised a significant amount of incentive stock options (ISOs).
• Have large capital gains or qualified dividends.

For official guidance, refer to the instructions for IRS Form 6251, Alternative Minimum Tax—Individuals.

What is the AMT exemption for 2023?

The AMT exemption amount for the 2023 tax year depends on your filing status:

• Single / Head of Household: $81,300
• Married Filing Jointly: $126,500
• Married Filing Separately: $63,250

These exemptions begin to phase out at high income levels. The phaseout threshold starts at $578,150 for single filers and $1,156,300 for those married filing jointly.