Thank you so much for expressing your concerns. Form 4626 is required to file with a corporation tax return unless a filing exclusion applies. Based on IRS Form 4626 instruction, taxpapers can choose to apply the safe harbor method (simplified method) if qualified. IRS clarifies rules for new corporate alternative minimum tax generally applies to large corporations with average annual financial statement income exceeding $1 billion.
If taxpayer qualified for safe harbor method (most corporation may qualify), they can click the "yes" box on Form 1120 Sch K Line 29c to avoid filing Form 4626.
If you have received an IRS letter regarding this issue, you may file amendment with updated Form 1120 with line 29c box checked yes. Or, you may also respond to IRS letter with Form 4626
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