Chapter VI - Aggregation of Income
Section 103
Section 103: unexplained investment
Section 103 targets investments that do not appear in an assessee's books of account, or that exceed the amount actually recorded there. If the assessee cannot satisfactorily explain the nature and source of such an investment (or the excess amount), it is deemed to be the assessee's income for that tax year.
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Need advice on Section 103?
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
Where in any tax year, any investment has been made by the assessee which is not recorded in the books of account, if any, maintained by such assessee for any source of income, or, the Assessing Officer finds that the amount of such investment exceeds the amount recorded in such books of account and— (a) the assessee offers no explanation about the nature and source of such investment, or such excess amount, as the case may be; or (b) the explanation offered about the nature and source of such investment by the assessee, is not satisfactory in the opinion of the Assessing Officer, then, the value of such investment, or such excess amount, as the case may be, shall be deemed to be the income of the assessee of that tax year.
Introduction
Section 103 addresses an investment absent from the books or recorded below the amount actually invested. If its nature and source are unexplained or the explanation is unsatisfactory to the Assessing Officer, the unrecorded value or excess may be deemed income for that tax year.
Key takeaways
Unrecorded investment
An investment not recorded in the taxpayer's books, or an amount spent above what is recorded, can be treated as income of that tax year.
Explanation is central
The deeming rule applies when the taxpayer offers no explanation of the nature and source, or the Assessing Officer finds the explanation unsatisfactory.
What Section 103 says
Where in any tax year an assessee has made an investment that is not recorded in the books of account (if any) maintained for any source of income, or the Assessing Officer finds that the amount of an investment exceeds the amount recorded in the books, and the assessee either offers no explanation about the nature and source of the investment or excess amount, or the explanation offered is not found satisfactory by the Assessing Officer, then the value of the investment, or the excess amount, is deemed to be the assessee's income for that tax year.
Identify the amount at issue
For an entirely unrecorded investment the issue is its value; for a partially recorded investment the issue is the excess over the books. The taxpayer's explanation should address that particular difference.
Evidence of source
Bank records, investment documents and the relevant book entries help reconcile the amount invested with the stated source of funds.
Step-by-step flow for applying Section 103
- 1
Did the assessee make an investment during the tax year?
- No: Section 103 does not apply.
- Yes: Go to the next step.
- 2
Is the investment recorded in the books of account maintained for any source of income?
- Not recorded: The whole investment is in question.
- Recorded, but the AO finds the investment exceeds the recorded amount: Only the excess is in question.
- Recorded in full: Section 103 does not apply.
- 3
Has the assessee explained the nature and source to the Assessing Officer's satisfaction?
- Yes: No addition under Section 103.
- No explanation, or not satisfactory: The value of the investment, or the excess, is deemed income of that tax year.
- 4
Keep the source evidence together
Records showing where the funds came from (bank statements, the books themselves, and documents for any gift or loan) are what an explanation of nature and source rests on.
Practical checklist
Do
- Reconcile each investment document to the relevant tax-year ledger and payment trail.
- Explain both the investment's nature and the source of any unrecorded amount.
Avoid
- Do not treat every difference in book value as income before testing the statutory explanation condition.
- Do not ignore the tax year in which the investment was made.
Illustrative example
Worked example: plot bought for more than the books show
Hypothetical facts (illustration only, not a real taxpayer): Mr. Rawat buys a plot during the tax year. His books record the investment at ₹22,00,000. The Assessing Officer finds that the investment actually made was ₹30,00,000. Mr. Rawat cannot explain the source of the difference.
Excess over books
₹30,00,000 - ₹22,00,000 = ₹8,00,000 not recorded in the books.
Explanation
No satisfactory explanation of the nature and source of ₹8,00,000 is offered.
Deeming
Section 103 deems the excess amount to be his income.
Outcome
- ₹8,00,000 is deemed to be Mr. Rawat's income of that tax year.
- The recorded ₹22,00,000 is not added under this section.
Glossary
- Unrecorded investment
- An investment absent from the assessee's books for any income source.
- Excess amount
- The amount invested above the figure recorded in those books.
Frequently asked questions
What triggers Section 103?
An investment made by the assessee that is either not recorded at all in their books of account, or is recorded at a lower value than what the Assessing Officer finds was actually invested.
What if I can explain the investment's source?
If the explanation about the nature and source of the investment (or the excess amount) is found satisfactory by the Assessing Officer, Section 103 does not apply to deem it as income.
Is the whole investment added if only part of it is missing from the books?
No. Where the investment exceeds the amount recorded in the books, Section 103 deems only the excess amount to be income, and only if its nature and source are not satisfactorily explained.
Need help applying this provision to your situation?
Get help responding to an unexplained investment queryLast updated 9 October 2026