Concept · C:antidilution

Antidilution

Working definition

The exclusion of a potential common-share effect when its inclusion would increase EPS or reduce loss per share under the applicable control-number test.

On this page
  1. Apply it
  2. Keep the boundary clear
  3. Authority

Antidilution belongs in a reconciled numerator-and-denominator workpaper. Antidilution excludes a potential common-share effect when including it would increase EPS or reduce loss per share under the control-number test. Compare the running result before and after each ordered instrument.

Apply it

If the running diluted EPS is $2.40 and the next convertible issue would produce $2.46, the issue is antidilutive and is excluded. Keep its potential shares and exclusion reason in the disclosure inventory.

Review antidilution against eps control number. Reconcile antidilution to diluted eps ordering, the dated antidilution evidence, and its final presentation.

The antidilution record ties eps control number to its source date, measured amount, and diluted eps ordering effect.

Keep the boundary clear

An instrument can change from dilutive to antidilutive between periods or after other instruments are included. Exclusion is a period-specific calculation result, not a permanent classification.

Authority

Read ASC 260-10-45-17 for the prohibition on antidilutive assumptions.

Learning objectives

Put the concept to work

Learning level

Apply this concept

  • Explain and apply antidilution within a reconciled numerator-and-denominator workpaper using supplied authoritative facts.

Learning resources

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Updated Sep 11, 2026 Review due Dec 11, 2026