Chapter IV - Computation of Total Income

Section 80

Section 80: fair market value deemed to be full value of consideration in certain cases

Section 80 is a short but important fallback rule: if the consideration for the transfer of a capital asset is not ascertainable or cannot be determined, the fair market value of that asset on the date of transfer is deemed to be the "full value of consideration", and capital gains are computed on that value.

Official text

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This article is for general information. Refer to the Income-tax Act, 2025 as amended by the Finance Act, 2026 and the Taxation and Other Laws (Amendment) Act, 2026 for the official provisions. If you need professional advice for your situation, contact Bizeneed.

Statutory text

Bare law

If the consideration received or accruing from the transfer of a capital asset is not ascertainable or cannot be determined, its fair market value on the date of transfer shall be deemed to be the full value of consideration received or accruing as a result of such transfer for the purposes of computing income under the head "Capital gains".

Introduction

The whole capital gains computation rests on Section 72, and the starting point of Section 72 is the "full value of consideration". In other words, you first need to know what was received in return for the transfer; only then can the cost of acquisition and the cost of improvement be deducted from it to arrive at the gain. Some transactions, however, have no such figure at all, or the figure simply cannot be worked out.

In such cases an old problem used to arise: if the computation machinery could not work, the charging section also failed and the transfer escaped tax altogether. Section 80 closes exactly this gap. It says that when the consideration is not ascertainable, the fair market value (FMV) of the asset on the date of transfer is to be treated as the consideration. As a result, the computation machinery is never left empty-handed.

Note that Section 80 is a deeming provision, not an anti-avoidance penalty provision. It applies when the consideration genuinely cannot be determined, not when consideration exists but has been understated. The Act has separate provisions for understated consideration (Section 78 for land or building, and Section 79 for unquoted shares).

Key takeaways

The trigger applies in only two situations

Section 80 is activated only when either of these conditions is met:

The consideration received or accruing is "not ascertainable", meaning the transaction has no determinable figure at all
The consideration "cannot be determined", meaning the value remains unknown even after an attempt to work it out

"Deemed" means a legal fiction

The section says "deemed to be", so treating FMV as the consideration is not optional; in the eyes of the law, that is the actual consideration. It also means you cannot argue that "I received nothing, so the gain is zero". The FMV has to be determined.

Only for capital gains, not for other heads

The last words of the section are "for the purposes of computing income under the head 'Capital gains'". This deeming fiction is therefore limited to the capital gains computation. The rule does not apply to business income, income from other sources or any other head.

FMV is defined in the Act itself

Under Section 2(44), "fair market value" in relation to a capital asset means the price that the asset would ordinarily fetch on sale in the open market on the relevant date; and if that price is not ascertainable, the price determined in the prescribed manner.

The valuation date is fixed: the date of transfer

FMV must be taken as on the date of transfer, not the date of the agreement, the date of payment or the date of assessment. It is therefore important to record the exact date of transfer clearly in the documents.

The Assessing Officer can refer the valuation to a Valuation Officer

Section 91 provides that, for ascertaining FMV for this Chapter, the AO may refer the valuation to a Valuation Officer, for example where the assessee has claimed a registered valuer's value but the AO considers that it is at variance with the FMV. Sections 269(3) to (8) apply to such a reference.

This section does not cover the cost side

Section 80 corrects only the consideration side. The cost of acquisition and cost of improvement are still worked out under the normal rules (Sections 72 to 76, and the deemed cost rules in Section 73). If the cost itself cannot be determined, this section will not help.

When Section 80 is used

In practice, this section applies where a transfer has taken place but what was received in return has no clear rupee value. Some typical examples:

An exchange of assets (barter), such as giving a plot and receiving in return something that has no determinate market value figure
Transfer of an asset under a family arrangement or settlement, where no monetary consideration was ever decided
Contingent consideration that cannot be quantified at the time of transfer and has no determinable basis
Business restructuring transactions where an asset moved but no separate value was assigned to it

When Section 80 does NOT apply

This distinction is the one most often misunderstood, so it is worth making clear. Section 80 does not apply when:

The consideration is determinable but low: if the sale deed states a figure and it is genuinely paid, the consideration is ascertainable, even if it is below FMV
The transfer is of land or building and the consideration is less than the stamp duty value: in this case Section 78 applies, not Section 80
The transfer is of an unquoted share and the consideration is less than the prescribed FMV: in this case Section 79 applies
There is only difficulty in working out the consideration: "difficult" and "cannot be determined" are two different things. The section is not triggered merely because effort is required
The asset is transferred by a person to a firm or other association of persons or body of individuals (not being a company or co-operative society) in which he is or becomes a partner or member, by way of capital contribution or otherwise: Section 67(9)(b) deems the amount recorded in the books of account of the firm, association or body as the value of the asset to be the full value of consideration, so Section 80 has no role even if that recorded value is below market value
An individual or HUF transfers land or building under a "specified agreement" - a registered agreement allowing another person to develop a real estate project in consideration of a share, being land or building or both, in the project (Section 67(15)(b)): Section 67(14) taxes the gain in the tax year in which the certificate of completion for the whole or part of the project is issued, and deems the stamp duty value of the owner's share on that date, increased by any consideration received in cash or by cheque, draft or any other mode, to be the full value of consideration. If the owner transfers the share on or before that date, Section 67(16) makes the gain income of the tax year of that transfer, and the other provisions of the Act decide the full value of consideration

Sections 78, 79 and 80: which provision applies when

Chapter IV has three separate rules that replace the full value of consideration. Their trigger, coverage and relief are entirely different:

Aspect	Section 78	Section 79	Section 80
Which asset	Land or building (or both)	Share of a company other than a quoted share	Any capital asset
Trigger	Actual consideration is less than the stamp duty value	Actual consideration is less than the prescribed FMV	Consideration is not ascertainable / cannot be determined
Deemed consideration	Stamp duty value	FMV determined in the prescribed manner	FMV on the date of transfer
Safe harbour	Yes - if the stamp duty value does not exceed 110% of the consideration, the actual consideration is accepted	No - but a prescribed class of persons may be exempted	Not applicable - there is no actual figure to compare against
Valuation Officer reference	Yes - under Section 78(2), with Sections 269(3)-(8) applying	Value is worked out by the prescribed method	AO may refer under Section 91

How to establish FMV

Section 2(44) defines FMV as the open-market price, but Section 80 does not lay down any single prescribed way of proving it. In practice, the following evidence carries the most weight:

A registered valuer's report valuing the asset as on the date of transfer (not a later date)
For immovable property, the circle rates / ready reckoner rates for that area, as corroborating evidence
Records of comparable transactions around the same time
For shares or business interests, a valuation working based on audited financial statements
If even the open-market price is not ascertainable, the prescribed manner under Section 2(44)(b)

Step-by-step flow for applying Section 80

1
Has a capital asset been transferred?
First confirm that the transaction does not fall in the Section 70 list of transactions not regarded as transfer.
- No: No question of capital gains arises - Section 80 does not apply either.
- Yes: Go to the next step.
2
Is the asset land/building, or an unquoted share?
The Act has separate specific rules for these two categories, which are examined before Section 80. Also check first whether Section 67(9) (transfer to a firm, AOP or BOI in which the transferor is or becomes a partner or member) or Section 67(14) (land or building transferred by an individual or HUF under a registered joint development agreement for a share in the project) applies - each fixes the full value of consideration itself, leaving no room for Section 80.
- Land/building: See Section 78 - the stamp duty value rule, with the 110% safe harbour.
- Unquoted share: See Section 79 - the prescribed FMV rule.
- Any other asset: Go to the next step.
3
Is the consideration ascertainable?
That is, do the transaction documents yield a determinate rupee figure?
- Yes: Section 80 does not apply. Use the normal computation under Section 72.
- No: Go to the next step.
4
Can the consideration be determined in any way?
The value of non-monetary consideration, a determinable basis for a contingent amount - anything from which a figure can be worked out.
- Yes: Use that determined value - Section 80 is not needed.
- No: Section 80 is triggered - go to the next step.
5
Determine the FMV on the date of transfer
Valuation date = date of transfer. Take the open-market price under Section 2(44); if that is also not ascertainable, use the prescribed manner. Keep a registered valuer's report ready - the AO may refer the valuation to a Valuation Officer under Section 91.
6
Compute the gain treating FMV as the full value of consideration
Capital gain = FMV (deemed consideration) - (cost of acquisition + cost of improvement + transfer expenses), under the rules in Section 72. Section 80 has no effect on the cost side.
7
Apply tax according to the holding period
The short-term or long-term classification follows the normal rules, and the applicable rate and indexation (where available) are applied accordingly.

Practical checklist

Do

Record the exact date of transfer clearly in the documents - the entire FMV depends on this date
Get a registered valuer's valuation report as on the date of transfer itself; do not rely on a backdated report prepared later
Keep the supporting evidence for the valuation safely - comparable transactions, circle rates, audited financial statements
If the consideration is non-monetary, have a full description of what was received written into the agreement
Disclose in the return that the consideration was not ascertainable and the basis on which FMV was taken
If the AO questions the valuation, follow the Valuation Officer reference process under Section 91

Avoid

Do not treat Section 80 as a shortcut for an undervalued sale - Section 78 or 79 applies there
Do not try to make consideration appear artificially "non-ascertainable" - this is under-reporting and can attract penalty under Section 439
Do not take FMV as on the date of assessment or the date of agreement - the law requires the date of transfer
Do not rely on this section for the cost of acquisition - it corrects only the consideration side
Do not put only your own estimate on file without a registered valuer's report
Do not ignore the AO's valuation questionnaire - if you do not respond, a best-judgment valuation may go against you

Illustrative example

Case study: exchange of a plot where no price was ever fixed

Hypothetical facts (illustration only, not a real taxpayer): Mr. Verma gave his commercial plot to a developer. In return, he received some undefined "future rights" in one of the developer's under-construction projects - no rupee amount was written in the agreement, and no flat number or area was specified. The agreement does not give him any share, being land or building, in the project. The date of transfer is 12 August 2026. The plot was bought in 2015 for Rs. 18 lakh.

Whether there was a transfer
Possession of and title to the plot passed to the developer, and the transaction does not fall in the Section 70 list of transactions not regarded as transfer. So there has been a transfer.
Whether the joint development rule in Section 67(14) applies
Mr. Verma is an individual who handed land to a developer, so Section 67(14) has to be checked first. It applies only where land or building is transferred under a "specified agreement", which Section 67(15)(b) defines as a registered agreement under which the owner allows another person to develop a real estate project in consideration of a share, being land or building or both, in the project. Here the agreement gives no share in land or building in the project - no flat, no area, no built-up space - only undefined rights. It is therefore not a specified agreement, Section 67(14) does not apply, and the gain is chargeable for the tax year in which the transfer took place under Section 67(1).
Which provision applies
The asset is land, but the issue here is not that the consideration is less than the stamp duty value - the issue is that there is no figure for the consideration at all. Section 78 needs an actual consideration to compare, which is not available here. Section 80 therefore applies.
Is the consideration ascertainable?
The "future rights" have no defined area, no price and no payment schedule. There is no basis for converting them into any determinate rupee value. So the consideration is neither ascertainable nor determinable.
Determine the FMV
A registered valuer assessed the open-market value of the plot on 12 August 2026 (the date of transfer) at Rs. 95 lakh, on the basis of three comparable sale instances in that area. Under Section 2(44), this is the FMV.
Compute the gain
Under Section 80, Rs. 95 lakh is treated as the full value of consideration. The cost of acquisition (Rs. 18 lakh, with indexation where available) and transfer expenses are deducted from it under the normal rules in Section 72.

Outcome

The capital gain is computed on the deemed consideration of Rs. 95 lakh, even though Mr. Verma did not receive a single rupee in cash on the date of transfer.
The holding period runs from 2015, so this is a long-term capital gain and is taxed at the applicable LTCG rate.
If Mr. Verma had shown a lower FMV and the AO had obtained a higher value from a Valuation Officer under Section 91, the difference would have been treated as under-reporting, creating exposure to penalty under Section 439.
If the facts were different - a registered agreement giving Mr. Verma identified flats or built-up area in the project - Section 67(14) would apply instead of Section 80. The gain would be taxed in the tax year in which the certificate of completion for the whole or part of the project is issued, and the full value of consideration would be the stamp duty value of his share on that date, increased by any consideration received in cash or by cheque, draft or any other mode - not the FMV of the plot on the date of transfer. If he transferred his share on or before the date of that certificate, Section 67(16) would make the gain income of the tax year of that transfer.

Judicial pronouncements

CIT v. B. C. Srinivasa Setty - (1981) 128 ITR 294 (SC)

The Supreme Court held that the charging section and the computation provisions form an integrated code - if the computation machinery cannot work at all for an asset (in that case self-generated goodwill, which had no cost of acquisition), no capital gains can be charged on its transfer. This "machinery failure" principle is the gap that Section 80 closes on the consideration side: computation no longer fails when the consideration is not ascertainable, because the FMV becomes the deemed consideration.

Judicial principles

"Not ascertainable" means impossible, not difficult

Courts have consistently taken the view that a deeming provision is invoked only when there is no basis at all for working out the value. A provision is not triggered merely because the valuation exercise is complex or time-consuming.

A deeming fiction extends only to its stated purpose

A legal fiction is not extended beyond its words. Section 80 itself says "for the purposes of computing income under the head 'Capital gains'", so this fiction cannot be used for any other head or any other computation.

Valuation must rest on fact-finding on the record

FMV is a question of fact. Both the assessee and the AO have to support their values with material evidence - an ad hoc estimate without material does not survive at the appellate stage.

The valuation date cannot be shifted

Where the statute specifies a valuation date, no other date can be substituted. In Section 80, that date is the "date of transfer".

Glossary

Capital asset: Property of any kind held by the assessee, other than the specific exclusions given in the Act.
Fair market value (FMV): Under Section 2(44), the price that the capital asset would ordinarily fetch on sale in the open market on the relevant date; and if that price is not ascertainable, the price determined in the prescribed manner.
Full value of consideration: The total amount received or accruing in return for the transfer - the starting figure of the capital gains computation under Section 72.
Deeming provision: A rule that creates a legal fiction - something is treated as what it actually is not, only for the purposes of that statute.
Date of transfer: The date on which the transfer of the capital asset took effect - under Section 80, FMV is taken as on this date.
Assessing Officer (AO): The income-tax officer who assesses your return and can question the valuation.
Valuation Officer: A departmental valuation expert to whom the AO can make a reference under Section 91 to work out the FMV of an asset.
Registered valuer: An independent valuer registered with the prescribed authority, whose report supports the FMV claimed by the assessee.
Stamp duty value: The value adopted by the State authority for stamp duty - the trigger for Section 78, not Section 80.

Section 80 is the safety net of the capital gains computation. When the consideration for the transfer of a capital asset is neither ascertainable nor capable of being determined, its fair market value on the date of transfer is treated as the full value of consideration, so that the transfer does not escape tax because the computation machinery fails. This section is not for undervalued sales (for those, Section 78 applies to land or building and Section 79 to unquoted shares); it is for genuine cases where no price figure exists at all, such as barter or family arrangements without a defined value. It also gives way to the specific rules in Section 67: a transfer to a firm, AOP or BOI by way of capital contribution is valued at the amount recorded in its books under Section 67(9)(b), and land or building transferred by an individual or HUF under a registered joint development agreement is valued under Section 67(14). The practical safeguard is simple: record the date of transfer clearly, keep a registered valuer's report as on that date, and disclose the basis of the FMV in the return.

Frequently asked questions

What consideration figure is used if the actual sale price of a capital asset cannot be determined?

The fair market value of the asset on the date of transfer. Under Section 80, that value is treated as the full value of consideration, and the capital gain is computed on it under the rules in Section 72.

What is the difference between Section 80 and Section 78?

Section 78 applies only to land or building, and only when the actual consideration is less than the stamp duty value - there, a consideration figure exists and is simply replaced (subject to the 110% safe harbour). Section 80 can apply to any capital asset and applies when there is no consideration figure at all. Section 78 answers understatement; Section 80 answers absence.

Will Section 80 apply even if I received nothing in return for the transfer?

If a transfer has taken place and it does not fall in the Section 70 list of transactions not regarded as transfer, then yes - the gain is computed treating FMV as the consideration. The whole point of the deeming provision is that the gain cannot be shown as zero by saying "nothing was received". However, if the transaction is genuinely a gift or a transfer excluded under Section 70, the question of Section 80 does not arise.

Who determines the FMV - me or the Assessing Officer?

The assessee first claims the FMV in the return, usually on the basis of a registered valuer's report. If the AO considers that the claimed value is at variance with the FMV, the AO may refer the valuation to a Valuation Officer under Section 91, and Sections 269(3) to (8) apply to that reference.

On which date should FMV be taken - the agreement date or the registration date?

On the date of transfer. Section 78 gives an option to take the value on the agreement date in certain conditions, but Section 80 gives no such choice - the text clearly says "fair market value on the date of transfer".

Does Section 80 apply to companies and firms as well?

Yes. The section does not specify any category of assessee - it applies to every person whose capital asset has been transferred, whether an individual, HUF, firm, LLP or company.

What happens if I show a lower FMV?

The AO can have the value worked out by a Valuation Officer under Section 91. If the assessed FMV turns out higher than your declared value, tax will be charged on the difference, and there is also exposure to penalty for under-reporting or misreporting under Section 439. In serious cases of wilful evasion, prosecution under Section 478 is also possible.

Does Section 80 also solve the problem of cost of acquisition?

No. This section works only on the consideration side. The cost of acquisition and cost of improvement are still worked out under Section 72 and its related provisions (such as the deemed cost rules in Section 73).

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Last updated 11 October 2026

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