Summarize the following court judgment. Appeal No. 494 of 1970. From the judgment and order dated the 24th January	 1969 of the Delhi High Court in Income Tax Ref. No. 51 of 1966. V. C. Desai	 J. Ramamurthy and R. N. Sachthey	 for the appellant. K. Sen and H. K. Puri	 for the respondent. The Judgment of the Court was delivered by SARKARIA	 J. This appeal is directed against the Judgment	 dated 24 1 1969	 of the High Court of Delhi answering in the affirmative the following question referred to it under section 66(1) of the Indian Income tax Act	 1922 (for short	 the Act) by the Commissioner of Income tax . "Whether on the facts and in the circumstances of the case the capital loss of Rs. 28	662/ could be determined and carried forward in accordance with the provisions of Section 24 of the Indian Income tax Act	 1922	 when the provisions of section 12B of the Income tax Act	 1922 itself were not applicable in the assessment year 1955 56. " The assessee (respondent) is a Private Limited Company. The assessment year under reference is 1955 56 and the relevant previous year is from 1 5 1953 to 30 4 1954. On 10 1 1952 the assessee pur 698 chased 1124 shares of M/s. Intercontinent Travancore Pvt. Ltd. at a cost of Rs. 1	12	400/ from M/s. Escorts (A&M) Ltd. In the relevant accounting year ending on 30 4 195 3 the assessee received 562 bonus shares from the same company. It thus acquired a total number of 1686 shares. On 3 9 53	 i.e. during the relevant previous year the assessee sold all these 1686 shares to M/s. Escorts (Agents) Ltd. for Rs. 84	300 and claimed a loss of Rs. 84	862/ in the income tax return filed by it. The Income tax Officer disallowed the entire loss of Rs. 84	862 on the ground that it was a loss of a capital nature. The assessee carried an appeal to the Appellate Assistant Commissioner and contended that this loss of Rs. 84	862/ was a revenue loss arising out of dealing in shares. The Appellate Assistant Commissioner found that the assessee 's claim was exaggerated and that the actual lose was to the tune of Rs. 28	662/ only. He further held that this loss of Rs. 28	662/ was not a 'revenue loss	 but a 'capital loss ' arising out of change of investments. Against the decision of the Appellate Assistant Commissioner the assessee preferred an appeal before the Tribunal	 challenging the findings of the Commissioner both in regard to the amount of loss and its nature. At the stage of arguments before the Tribunal	 the assessee 's Counsel did not press these grounds of appeal but took up the plea that the amount of Rs. 28	662/ which had been held to be a "capital loss" by the authorities below	 should be allowed to be carried forward and set off against profits and gains	 if any	 under the head "capital gains" earned in future	 as laid down in sub sections (2A) & (2B) of section 24 of the Act. Despite objection from the Departmental Representative	 the Tribunal allowed this new ground to be raised with the observation that It was "a pure question of law and did not require investigation of any fresh fact '. It further accepted the contention of the assessee and directed that the "capital loss" of Rs. 28	662/ should be carried forward and set off against "capital gains" if any	 in future. At the instance of the Commissioner of Income tax	 the Tribunal referred the above question (set out at the commencement of this judgment) to the High Court under section 66(1) of the 1922 Act. It was contended before the High Court on behalf of the Revenue that the expression "capital gains" in sub section (2A) of section 24 has reference only to section 12B so that the loss suffered in the year in which the profits under the head "capital gains" were not taxable	 could not fall within sub section (2A) of section 24	 section K. Kapoor J.	 speaking for the Division Bench	 rejected this contention in these terms : "This argument overlooks the fact that the head of income chargeable to income tax are set out in section 6. "Section 12 B deals only with the computation of capital gains and with their taxability if they arise during a particular period. As a matter of fact	 section 12B itself refers to section 6 inasmuch as it says that "the tax shall be payable by an assessee under the bead "capital gains". This obviously has reference to the VIth head in section 6. The effect of 699 sub section (2A) and (2B) of section 24 read with section 6 and 12B	 therefore	 is that if a capital loss is incurred in a year in which a capital gain did not attract tax under section 12B such loss would still be loss under the head "capital gains" and if in subsequent year the assessee has any profit under that head it can still be carried forward and set off against the taxable capital gain. The Tribunal was in my opinion	 right in coming to the conclusion that it did. " Hence this appeal by the Commissioner of Income tax (Central) Delhi. Capital Gains Tax for the first time was introduced by the Income tax and Excess Profit Tax (Amendment) Act	 1947 (No. 22 of 1947) which inserted section 12B in the Act. This section made taxable "capital gains" which arose after March 31	 1946 The same Act of 1947 added as the VIth head "capital gains" in section 6 of the Act. It also inserted sub sections (2A) and (2B) in section 24 of the Act. The Indian Finance Act	 1949 virtually abolished the levy and restricted the operation of section 12B to "capital gains" arising before the ' 1st April	 1948. But section 12B in its restricted form	 and the VIth head	 capital gains ' in section 6	 and sub sections (2A) and (2B) of section 24 were not deleted and continued to form part of the Act. The Finance (No. reintroduced the "capital gains '	 tax with effect from the 31st March	 1956. It substantially altered the old section 12B and brought it into its present form. As a result of Finance Act (3) of 1956 "capital gains" again became taxable in the assessment year 1957 58. The position that emerges is that "capital gains" arising	 between 1 4 1948 and 31 3 1956	 were not taxable. The capital loss in question relates to this period. Mr. V. section Desai	 learned Counsel for the appellant contends that according to the scheme of the Act	 a "capital loss" occurring in a previous year	 could be allowed to be carried forward and set off against the capital gains of a subsequent year	 only if the income under that head was taxable in the relevant previous and subsequent years. Since during the period from 1 4 1948 to 31 3 1956	 capital gains (plus) or capital gains (minus) did not enter into computation of the	 total income of the assessee chargeable to tax under section 3 read with section 12B of the Act	 the question of carrying forward inch loss did not arise	 much less could such a loss be set off against the profits of any subsequent year. As against this	 Shri Ashok Sen	 learned Counsel for the assessee maintains that a	 right to carry forward a loss under any of the heads enumerated in section 6	 is not dependent upon the taxability of income under that head it is sufficient if at the relevant time "capital gains" is one of the heads of income recognized by the charging section 6 and the loss is adjustable against "capital gains"	 if any	 in future under section 24. The argument proceeds	 that section 6(vi) was not lying inert on the	 statute book but was operative	 throughout	 for the purpose of calculating the losses under that head. Shri Sen compared the non taxability of 700 capital gains during the period from 1 4 1948 to 31 3 1956	 to a tax holiday for those years. Another illustration given by the learned Counsel is of a person whose total income falls entirely on the negative side on account of losses suffered by him under any of the heads of income given in section 6. Such a person notwithstanding the fact that he had no assessable income has a right to file a return and get his losses computed by the Income tax Officer merely for the purpose of carrying forward the loss. The Income tax Officer	 it is added	 cannot ignore the return filed by the assessee	 voluntarily	 showing losses even though such a return is filed beyond time. In this connection	 Shri Sen has referred to Commissioner of Income tax	 Punjab vs Kulu Valley Transport Co. Ltd. (1)	 Jaikishan Gopikishan and Sons vs Commissioner of Income tax	 M.P. (2) and Commissioner of Income tax	 Madhya Pradesh vs Khushat Chand Daga(3). Before dealing with the contentions canvassed	 it will be appropriate to have a clear idea of the terms 'income '	 'total income '	 'computation of total income '	 'carrying forward ' of a loss and its purpose	 in the context of the scheme of the Act. Section 2 Cl. (15) defines "total income" to mean total amount of income	 profits and gains referred to in sub section (1) of section 4 computed in the manner laid down in this Act. Section 3	 captioned as "Charge of Income tax"	 emphasises that the income tax shall be charged in respect of the total income of the previous year of every assessee. Section 4 defines the ambit of that total income. Section 6 enumerates six heads of income	 profits and gains chargeable to income ax. They are : " (i) Salaries. (ii) Interest on securities. (iii) Income from property. (iv)Profits and gains of business	 profession or vocation. (v) Income from other sources. (vi) Capital gains. " Sections7	 8	 9	 10	 12 and 12B relate to payability and computation of taxunder the various heads of income. The material part of section 12B at the relevant time was as follows: "12B (1) The tax shall be	 payable by an assessee under the head "Capital gains" in respect of any profits or gains arising from the sale	 exchange or transfer of a capital asset effected after the 31st day of March 1946 and before the	 1st day of April	 1948 and such profits and gains shall be deemed to be income of the previous year in which the sale	 exchange or transfer took place. " (1) 7 (3) (2) 701 Section 22(1) requires a general notice to be published requiring every person whose total income during the previous year exceeds the maximum non taxable limit to Me a return. Sub section (2) of this section enables the Income tax Officer to issue notice to any such person requiring him to furnish a return. Sub section (2A) which was inserted by the Income tax Amendment Act 25 of 1953 with effect from 1 4 1952 provides "If any person who has not been served with a notice under sub section (2) has sustained a loss of profits or gains in any year under the head Profits and gains of business	 profession or vocation	 and such loss or any part thereof would ordinarily have been carried forward under sub section (2) of section 24	 he shall	 if he is to be entitled to the benefit of the carry forward of loss in any subsequent assssment	 furnish within the time specified in the general notice given under sub section (1) all the particulars required under the prescribed form of return. " The material part of section 24 runs thus : "24.(1) Where any assessee sustains a loss of profits or gains in any year under any of the heads mentioned in section 6	 he shall be entitled to have the amount of the loss set off against his income	 profits or gains under any other head in that year * * * * * Provided that in computing the profits and gains chargeable under the head "Profits and Gains of business	 profession or vocation"	 any loss sustained in speculative transaction which are in the nature of a business shall not be taken into account except to the extent of the amount of profits and gains	 if any	 in any other business consisting of speculative transactions * * * * * (2) Where any assessee sustains a loss of profits or gains in any year	 being a previous year not earlier than the previous year for the assessment for the year ending on the 31st day of March 1940	 in any business	 profession or vocation	 and the loss cannot be wholly set off under sub section (1)	 so much of the loss as is not so set off or the whole loss where the assessee bad no other head of income shall be carried forward to the following year	 and (i) where the loss was sustained by him in a business consisting of speculative transactions	 it shall be set off only against the profits and gains	 if any	 of any business in speculative transaction carried on by him in that year; (ii) where the loss was sustained by him in any other business	 profession or vocation	 it shall be set off against the profits and gains	 if any	 of any business	 profession or vocation carried on by him in that year pro 702 vided that the business	 profession or vocation in which the loss was originally sustained continued to be carried on by him in that year; and (iii) if the loss in either case cannot be wholly so set off	 the amount of loss not so set off shall be carried forward to the following year and so on. * * * * * * 2A. Notwithstanding anything contained in sub section (1)	 where the loss sustained is a loss falling under the head "Capital gains". such loss shall not be set off except against any profits and gains failing under that head. Where an assessee sustains a loss such as is referred to in sub section (2A) and the loss cannot be wholly set off in accordance with the provisions of that sub section	 the portion not so set off shall be carried forward to the following year and set off against capital gains for that year	 and if it cannot be so set off	 the amount thereof not so set off shall be carried forward to the following year and so on	 so however	 that no such loss shall be so carried forward for more than six years : Provided that where the loss sustained in any previous year does not exceed fifteen thousand rupees	 it shall not be carried forward. (3) When	 in the course of the assessment of the total income of any assessee	 it is established that a loss of profits or gains has taken place which he is entitled to have set off under the provisions of this section	 the Income tax	 Officer shall notify to the assessee by order in writing the amount of the loss as computed by him for the purposes of this section	. " Section 2(6C) provides that 'income ' includes (among other things) "(vi) any capital gain chargeable under Section 128. " From the charging provisions of the Act	 it is discernible that the words 'income ' or 'Profits and gains ' should be understood as including losses also	 so that	 in one	 sense 'profits and gains ' represent 'plus income ' whereas losses represent 'minus income '(1). In other words	 loss is negative profit. Both positive and negative profits are of a revenue character. Both must enter into computation	 wherever it becomes material	 in the game mode of the taxable income of the assessee. Although section 6 classifies income under six heads	 the main charging provision is section 3 which levies income tax	 as only one tax	 on the 'total income ' of the assessee as defined in section 2(15). An income in order to come within the purview of that definition must satisfy two conditions. Firstly	 it must comprise the "total amount of income	 (1) CIT vs Karamchand Prem Chand ; CIT V. Elphinston Spinning & Weaving Mills; 703 profits and gains referred to in s: 4(1). " Secondly	 it must be "computed in the manner laid down in die Act". If either of these conditions fails	 the income will not be a part of the "total income" that can be brought to charge. Now	 capital gains would be covered by the definition of 'income ' in sub section (6C) of section 2	 only if they were chargeable under section 12B. As noticed already	 s.12B as modified by the Finance Act	 1949	 did not charge any 'capital gains ' arising between 1 4 1948 to 14 1957. Indeed	 section 12B was not operative in these years (1948 57). During this period	 "capital gains"	 whether on the positive or the negative side	 could not be computed and charged under section 12B or any other provisions of the Act. In the instant case	 the second condition	 namely	 "the manner of computation laid down in the Act" which to use the words of Stone C.J.(1) "f an integral part of the definition of 'total income" ' was not satisfied. Thus in the relevant previous year and the assessment year	 or even in the subsequent year	 capital gains or "capital losses" did not form part of the "total income" of the assessee which could be brought to charge	 and were	 therefore	 not required to be computed under the Act. Before the insertion of sub section (2A) in section 22 by the amendment of 1 4 1952	 an assessee was entitled to carry forward a loss even if he had submitted no return for the year in which the loss was sustained. After the enactment of sub section (2A)	 it is a condition precent to the carry forward and set off of	 the loss	 that the assessee must file a return either in response to a general notice under sub section (1) of section 22 or voluntarily	 without any individual notice under sub section (2) of that section. If he does not Me the return for the year in which the loss was incurred and get the loss computed by the Income tax Officer	 the right to carry forward the loss will also be lost. But if the loss is from a source or head of income not liable to tax or congenitally exempt from income tax	 neither the assessee is required to show the same in the return	 nor is the Income tax Officer under any obligation to compute or assess it	 much less for the purpose of "carry forward". It is noteworthy that in the instant ease	 the assessee in his return had not shown any "capital losses". He had claimed this loss as a revenue loss. The Income tax Officer could	 therefore	 reject the assessee 's claim to carry forward the loss	 merely on the ground that it was not a "revenue loss". His further finding that it wag a "capital loss" was only incidental and	 in fact	 was not necessary. From what has been said above	 it follows as a necessary corollary	 that during the period section 12B did not make income under the he ad	 	capital gains ' chargeable	 an assessee was neither required to show income under that head in his return	 nor entitled to file a return showing "capital losses" merely for the purpose of getting the same computed and carried forward. Sub section (2A) of section 22 would not give him such a right because the operation of that sub section is	 in terms	 confined to (i) a loss which is sustained "under the head 'profits and gains	 of business	 profession or vocation" and would ordinarily (1) In re Kamdar 	 21. 704 have been carried forward under sub section (2) of section 24	 and (ii) to "income" which falls within the definition of 'total income '. Both these conditions necessary for the application of the sub section are lacking in the present case. Nor do we find any substance in the contention that under sub section (2) read with subsection (1) of section 24	 the assessee had an independent right to carry forward his capital loss	 even if it could not be set off	 owing to the non taxibility of capital gains	 against future profits	 it any	 in the immediate subsequent years. Sub section (2) of section 24 expressly refers to loss 'in any business	 profession or vocation '. It does not cover a "Capital loss"	 or the minus income under the head 'capital gains ' which at the relevant time	 were not chargeable and did not enter into computation of the 'total income ' of the assessee under the Act. It may be remembered that the concept of carry forward of loss does not stand in vacuo. It involves the notion of set off. Its sole purpose is to set off the loss against the profits of a subsequent year. It presupposes the permissibility and possibility of the carried forward loss being absorbed or set off against the profits and gains	 if any	 of the subsequent year. Set off implies that the tax is exigible and the assessee wants to adjust the loss against profit to reduce the tax demand. It follows that if such set off is not permissible or possible owing to the income or profits of the subsequent year being from a nontaxable source	 there would be no point in allowing the loss to be "carried forward". Conversely	 if the loss arising in the previous year was under a head not chargeable to tax	 it could not be allowed to be carried forward and absorbed against income in a subsequent year	 from a taxable source. Now let us test the claim of the assessee in the light of the above principles. The "capital loss" of Rs. 28	662/ in the present case	 was	 sustained in September 1953	 that is	 in the previous year 1953 54. Let us assume that in the subsequent years 1955 56 and 1956 57 when the capital gains were not taxable	 he made huge capital gains far exceeding this loss	 could he be obliged to show those capital gains ill his return? Could the loss of the year 1953 54 be absorbed or set off against such capital gains of the subsequent years? The answer is emphatically in the negative. The cases cited by Shri Sen are not relevant. In all those cases	 the heads of income under which the	 losses were sustained	 were chargeable to tax. None of them was a case of 'capital loss ' pertaining to the period	 1948 to 1957. For the foregoing reasons	 we are of the opinion that the High Court was in error in answering the question referred to it	 in favour of the assessee. We would reverse that answer in favour of the Revenue. In the result	 the appeal is accepted with costs. Appeal allowed.

By the Income tax and Excess Profit Tax (Amendment) Act	 1947 section 12B was inserted in the Indian Income tax Act	 1922	 making capital gains which arise after March 31	 1946	 taxable. The same Act inserted sub sections (2A) and (2B) in section 24 of the Income tax Act. As a result of the Indian Finance Act	 1949 which restricted the operation of section 12B to capital gains arising before April 1	 1948	 and the Finance (No. 3) Act	 of 1956 which restored tax on capital gains with effect from April 1	 1948 capital gains arising from 1 4 1949 to 31 3 1956 were not taxable. For the assessment year 1955 56 which relates to the period when capital gains were not taxable the assessee claimed a loss of Rs. 84	862/ arising from the sale of certain shares. The Income tax Officer disallowed the loss on the ground that it was a loss of capital nature. The Appellate Assistant Commissioner	 in appeal	 held that the assessee 's claim was exaggerated	 that the actual loss was only Rs. 28	662/ and agreed with the Income tax Officer that the loss was not a revenue loss but a capital loss. Before the Tribunal the assessee contended that the amount of Rs. 28	662	/ which had been held to be a capital less by the authorities should be allowed to be carried forward and set off against profits and gains under the head "Capital gains" earned in future as laid down in section 24(2A) and (2B). The Tribunal held in favour of the assessee. The High Court. in reference	 confirmed the order of the Tribunal holding that the effect of sub sections (2A) and (2B) of section 24 read with sections 6 and 12B was that if a capital loss was incurred in a year in which a capital gain did not attract tax under section 12B even then such loss would still be loss under the head 'capital gains ' and if in a subsequent year the assessee had any profit under that head it would still be carried forward and set off against the taxable capital gain. Allowing the appeal to this Court	 HELD : (1) From the charging provision of the Indian Income tax Act it is discernible that the words 'income ' or 'profits and gains	 should be understood as including losses	 so that both must enter into computation	 wherever it becomes material	 of the taxable income of the assessee. Although section 6 classifies income under six heads the main charging provision is section 3 which levies income tax as only one tax on the 'total income ' of the assessee as defined in section 2(15). An income in order to come within the purview of that definition must satisfy two conditions. (a) it must comprise the 'total amount of income	 profits and gains referred to in section 4(1)	 and (b) it must be computed in the manner laid down in the Act. If either of these conditions fails the income will not be a part of the total income that can be brought to charge. [702F 703B] (2)The concept of carry forward of loss does not stand in vacuo. Its sole purposeis to set off the loss against the profits of a subsequent year. Set off impliesthat the tax is exigible and the assessee wants to adjust the loss against profit to reduce the tax demand. It follows that if such set off is not Permissible or possible owing to the income or profits of the subsequent year being from a non taxable source	 there would be no point in allowing the loss to be carried forward. Also	 if the loss arising in the previous year was under a head not chargeable to tax it could not be allowed to be carried forward and absorbed against income in a subsequent year from a taxable source. [704C E] (3) Capital gains would be covered by the definition of income in section 2(6C) only if they were chargeable under s ' 12B. But section 12B was not operative in the years 1948 to 1956. Thus in the relevant previous year and the assessment year or even in he subsequent year capital gains ' or 'capital losses ' did not 697 form part of the total income of the assessee which could be brought to charge and were	 therefore	 not required to be computed under the Act. That is condition (b) which 'total income ' must satisfy is not satisfied in the present case. [703B D] (4) Under section 22(2A) it is a condition precedent to the carry forward and set off of the loss that the assessee must file a return either in response to a general notice	 under section 22(1) or voluntarily	 without any individual notice under subsection (2). If he does not file the return for the year in which the loss was incurred and get the loss computed by the Income tax Officer	 the right to carry forward the loss will also be lost. But if the loss is from a source or head of income not liable to tax or exempt from tax neither the assessee is required to show the same in the. return nor is the Income tax Officer under any obligation to compute or assess it	 much less for the purpose of carry farward. [703D F] (5) In the instant case. the	 assessee in his return had not shown any 	capital loss ' but claimed the loss as a revenue loss. The Income tax Officer should have rejected the assessee 's claim to carry forward the loss merely on the ground that it was not a revenue loss and he need not have given a finding that it was a capital loss	 because 'capital gains were not taxable during the year. [703F G] (6) Section 24(2) expressly refers to loss	 'in any business	 profession or vocation '. It does not cover a capital loss under the head 'capital gains ' which at the relevant time were not chargeable and did not enter into computation of the total income of the assessee. Therefore	 under a. 24(1) and (2) the assessee had no independent right to carry forward his capital loss even if it could not be set off owing to the non taxability of capital gains against future profits in the immediate subsequent years. [704B C] (7) Assuming	 therefore	 that the assessee in the subsequent years 1955 56 and 1956 57 when the capital gains were not taxable made huge capital gains he would not be obliged to show those capital gains in his return. Therefore	 the loss suffered by him in the relevant assessment year in the instant case could not be absorbed or set off against such capital gains. [704F]