HomeNewsBusinessPersonal FinanceTata Motors demerger decoded: How your cost splits between PV and CV shares, and what the 2018 rule means for you

Tata Motors demerger decoded: How your cost splits between PV and CV shares, and what the 2018 rule means for you

Under the Income-Tax Act, when a company undergoes a demerger, the original cost of acquisition of your shares in the parent company must be apportioned between the demerged (old) company and the resulting (new) company.

November 16, 2025 / 10:58 IST
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Tata Motors demerger: Taxation Rules
Tata Motors demerger: Taxation Rules

Shares of Tata Motors’ commercial vehicle arm made their market debut on the NSE on November 12, listing at Rs 335 per share, a 28.5 premium premium over the discovered price. The listing marks the completion of Tata Motors’ demerger, separating its passenger and commercial vehicle businesses into two distinct entities.

Since Tata Motors has announced a major restructuring splitting its business into two listed entities, one focused on Passenger Vehicles (PV) and the other on Commercial Vehicles (CV), investors have been curious not only about business strategy but also about their tax position. After all when you hold shares in the original company and it gets divided, what cost basis do you apply when the new company’s shares arrive in your demat account for taxation purposes?

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Abheet Sachdeva, Partner, Nangia Group explains that under the Income-Tax Act, when a company undergoes a demerger, the original cost of acquisition of your shares in the parent company must be apportioned between the demerged (old) company and the resulting (new) company. The formula is based on the ratio of: Net book value of assets transferred : Net worth of the demerged company as a whole before demerger.

In plain terms: if the parent company had, say, a net worth of 100 units and you know the portion of assets that moved into the new company is 40 units, then the ratio is 40:100 = 40% to the new company, and 60 percent remains with the old company.