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The section 481(a) adjustment period is generally 1 year for a net negative adjustment and 4 years for a net positive adjustment
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https://www.irs.gov/instructions/i1120f
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https://www.irs.gov/publications/p505
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https://www.irs.gov/publications/p334
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https://www.irs.gov/publications/p225
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https://www.irs.gov/publications/p17
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