That means that you haven't had to pay the AMT tax in those prior years. Which means that you don't need to worry about those amounts.
The AMT was designed to stop high income taxpayers who didn't pay any income taxes through using too many deductions the pay an extra amount of tax by eliminating some of those deductions. That is why the amounts are so different. But the system calculates that for everyone. It doesn't mean that you will be responsible for paying it.
@waldo-bastian
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