Alternative Minimum Tax (AMT) Changes 2025: What High-Income Earners Need to Know

Page summary

2025 AMT changes: 20.5% rate, $177,882 exemption, 100% capital gains inclusion. Essential planning guide for high-income Canadian professionals.

• Article details: Tax Planning; published December 12, 2025; 8 min read.
• If you're a high-income professional, business owner, or investor in Ontario, the Alternative Minimum Tax (AMT) changes that took effect in 2024 might significantly impact your 2025 tax bill. These aren't minor adjustments—they represent the most substantial reform to Canada's AMT system in over 35 years.
• For many Markham and GTA professionals, particularly those with incorporated practices, significant investment income, or large capital gains, these changes could increase your tax liability by tens of thousands of dollars. Understanding the new rules and planning accordingly isn't optional—it's essential.
• Quick Answer: What Changed with AMT in 2025?
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• Disclaimer: This article provides general information about Alternative Minimum Tax for educational purposes. Tax rules are complex and situation-specific. Always consult with a qualified tax professional before making significant financial decisions. The examples provided are illustrative and may not reflect your specific circumstances.

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