Cost with reference to certain modes of acquisition.
49. [(1)] Where the capital asset became the property of the assessee—
(i) on any distribution of assets on the total or partial partition of a Hindu undivided family;
(ii) under a gift or will;
(iii) (a) by succession, inheritance or devolution , or
(b) on any distribution of assets on the dissolution of a firm, body of individuals, or other association of persons, where such dissolution had taken place at any time before the 1st day of April, 1987, or]
(c) on any distribution of assets on the liquidation of a company, or
(d) under a transfer to a revocable or an irrevocable trust, or
(e) under any such transfer as is referred to in clause (iv) [or clause (v)] [or clause (vi)] [or clause (via)] [or clause (viaa)] [[or clause (vica) or [clause (vicb)] of section 47];
(iv) such assessee being a Hindu undivided family, by the mode referred to in sub-section (2) of section 64 at any time after the 31st day of December, 1969,]
the cost of acquisition of the asset shall be deemed to be the cost for which the previous owner of the property acquired it, as increased by the cost of any improvement of the assets incurred or borne by the previous owner or the assessee, as the case may be.
the act does not say any thing about the treatment of advance money forfeited by the previous owner.
Advance money received.
51. Where any capital asset was on any previous occasion the subject of negotiations for its transfer, any advance or other money received and retained by the assessee in respect of such negotiations shall be deducted from the cost for which the asset was acquired or the written down value or the fair market value, as the case may be, in computing the cost of acquisition.
In this section forget about the treatment of advance money forfeited by the previous owner, "PREVIOUS OWNER" ye word to entire section me kahin use bhi nahi hua hai.