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Blog The Sneaky Tax That Surprises Business Owners at Exit: Understanding Canada’s AMT

March 08, 2026

When you sell your business, you expect to celebrate a major milestone, not face an unexpected tax bill. Yet many Canadian business owners are caught off guard by the Alternative Minimum Tax (AMT), a parallel tax system that quietly runs alongside your regular tax calculation. If you plan to sell your company now or in the future, understanding AMT is essential to keeping more of the wealth you’ve built.

What Is AMT and Why Does It Matter When You Sell Your Business?

The Alternative Minimum Tax (AMT) is a secondary tax calculation designed by the CRA to ensure that high-income earners – particularly those using large deductions or tax preferences – pay a minimum level of tax. It applies most often to:

  • Business owners selling shares
  • Individuals claiming the Lifetime Capital Gains Exemption
  • People with large interest deductions
  • Individuals with significant capital gains

The Good News: AMT Is Recoverable – With the Right Strategy

The AMT you pay isn’t necessarily gone forever. In most cases, it’s recoverable over the next seven years as long as your regular tax in those years exceeds your AMT. This is where retirement income planning becomes a powerful strategy. To recover AMT, you need fully taxable income, such as:

  • RRSP withdrawals
  • Employment income
  • Fully taxable investment income
  • Eligible or non-eligible dividends

On the other hand, capital gains in retirement may not help, because they reduce regular tax relative to AMT. This is why planning ahead – especially in the year of your business sale and the years that follow – is critical. Without a strategy, the
AMT you paid could become a permanent tax.

How Business Owners Can Avoid Costly Surprises

Proactive planning is your best defence. Before selling your business, talk to your accountant and financial planning team about:

  • Timing the sale to optimize your tax position
  • Structuring income in the years following your exit
  • Using RRSPs strategically in retirement
  • Ensuring your business qualifies for the LCGE
  • Projecting AMT and planning to recover it

With the right approach, AMT doesn’t need to be a burden – it can simply be another tax factor to manage thoughtfully.

Authored by: Jason Nagel, at Three60 Wealth

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