Accounting gain on sale of intangibles occurs when:
The sale proceeds exceed the carrying (book) value of the intangible asset.
The gain is recorded as “Other Income” in the profit and loss account.
Calculation: Sale Price – Book Value = Gain.
It is a non-operating income unless the business regularly trades such assets.
The gain is subject to income tax under the head “business income” or “capital gain,” depending on nature.