What is Alternative Minimum Tax (AMT) in the U.S.? How does Alternative Minimum Tax get calculated?

What conditions are likely to trigger an AMT assessment versus a regular tax assessment?

Are there any useful online calculator tools to help determine if one may be subject to an AMT assessment?


With all the deductions, credits, and other shenanigans in the tax code, it has become possible for more and more people to end up paying nothing in taxes even though their income is relatively high.

This is not good from a revenue point of view. The AMT is a way for the government to decide the discounts you got were too many and that you indeed to owe tax money.

The issue is of relevance today because of higher home ownership and other offsets, more and more people are subject to the alternative minimum tax than ever before. If you manually file your paperwork, be aware.

If you make more than $75,000 a year and have some large deductions, you might be subject to the tax.

Most (if not all) reputable accountants or filing software will calculate the need for you. Be sure you know, because not paying when you should means paying penalties if you are audited. The IRS does not forget, nor does it forgive.


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    Another problem with AMT is that the law wasn't designed to adjust for inflation and consequently it is affecting far more than just the "rich" people it was intended to. – JohnFx Jan 19 '10 at 20:09
  • "deductibles", or deductions? – myron-semack Mar 24 '11 at 19:41
  • @msemack - how dare you! – MrChrister Mar 24 '11 at 20:53
  • I have edit privileges and was gonna fix it, but then I second-guessed myself because I wasn't sure there it there was some interesting relationship between insurance deductibles and AMT that I didn't know about. Sorry :-P – myron-semack Mar 25 '11 at 15:12
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    I believe I have shown myself to be barely literate, so feel free to fix my mistakes. I take no offense =) – MrChrister Mar 25 '11 at 17:04

AMT is technically a second tax code ....citizens of the US pay the greater of the two.

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