Unaccounted business receipts evidenced by third-party loose sheets require corroboration and a demonstrated nexus with the taxpayer; project-specific details and conduct in offering related profit supported the receipt quantum. Only the embedded profit in established on-money receipts is taxable, and an admission made to buy peace does not conclusively determine the applicable rate; absent material supporting a higher margin, profit was estimated using an 8% presumptive-tax benchmark. No further telescoping applies where unaccounted expenditure has already been treated as funded from those receipts. A challenge to penalty initiation is premature until a penalty order is made.

Reassessment under Section 148 requires the Assessing Officer's independent satisfaction, based on recorded material, that income has escaped assessment. Where an invalid return disclosed interest income, related expenditure and net profit, treating the entire gross interest income as escaped without material showing that expenditure was inadmissible did not establish a genuine basis for reopening. Reopening solely to comply with a CBDT instruction for invalid returns selected for scrutiny, rather than on independent satisfaction, renders the Section 148 notice and consequential reassessment void ab initio.

Reassessment initiated after four years is jurisdictionally invalid where the capital-gain transaction was fully disclosed, examined in the original assessment, and reopening rests on no fresh tangible material or identified failure of full and true disclosure. Reconsidering the same transaction constitutes a change of opinion. Reassessment is also invalid where a return filed in response to a section 148 notice is followed by no notice under section 143(2). Issuance of that notice is mandatory after receipt of the return; treating the return as non est or relying on delayed filing does not cure its omission. The reassessment order and consequential addition therefore cannot survive.

Rectification proceedings under section 154 can address a typographical error in reporting capital gains where co-owners each disclosed the full gain despite equal ownership. A mistaken variation in income under a particular head does not amount to a fresh claim requiring a revised return. An appellate authority may consider the correction in an appeal from a section 154 order and undertake verification to prevent taxation beyond the assessee's real income. Tax may be levied only in accordance with law under Article 265 of the Constitution; accordingly, taxability limited to the assessee's 50% share requires verification in accordance with law.

Revision under section 263 requires both an erroneous assessment order and prejudice to Revenue. Interest reimbursed on a back-to-back basis to an intermediary for payment to ultimate debenture holders, where the intermediary retains no income beyond its taxed margin, does not create tax-deduction liability under section 194A or disallowance under section 40(a)(ia). Revisionary action also lacks basis where profit-before-tax and ICDS explanations, supporting material, and relevant records were already before the assessment authority; further verification without demonstrated error and prejudice is a roving enquiry. On these principles, the original assessment remains operative.

Interest-free advances are presumed to be funded from interest-free capital where such funds exceed the advances and no nexus is established between borrowed funds and the advances; proportionate interest disallowance under Section 36(1)(iii) was therefore deleted. Book profit credited to partners' capital accounts, supported by audited accounts and corresponding profit-and-loss appropriation entries, does not constitute an unexplained cash credit under Section 68 because it records no unexplained receipt or inflow. Reassessing disclosed profit as cash credit would amount to double taxation. Depreciation claimed in computing income does not alter the explained nature of the book profit. Both additions were removed.

Accepted trade-creditor liabilities arising from undisputed credit purchases cannot be treated as unexplained cash credits solely because suppliers do not respond to verification notices. Absent material disproving purchases, showing payment of liabilities, or establishing that liabilities are fictitious, the Section 68 addition was deleted. The Form 26AS receipt difference required fresh verification where tax was deducted on gross receipts including service tax that was separately accounted for and excluded from income. Rejection of books and net-profit estimation were also unsustainable where ledgers and major vouchers had been provided, adequate time for remaining vouchers was not granted, and no specific expenditure was found unverifiable.

Unrecorded transport receipts linked to a taxpayer through customer confirmation, PAN reporting and claimed tax deducted at source credit are treated as business turnover unless reliable contrary evidence establishes diversion. Gross turnover is not wholly taxable income where transport operations necessarily entail expenditure; taxation applies to the reasonably estimated profit embedded in those receipts. A disclosed profit margin need not be mechanically applied to unrecorded receipts when related expenditure is unverifiable, permitting estimation at a higher margin. Assessment is therefore confined to the estimated profit component of undisclosed transport turnover rather than the full gross receipts.

Taxation of outstanding trade creditors requires proof that the taxpayer obtained a benefit through remission or cessation; missing confirmations, bills or vouchers alone do not establish that result where creditor-wise material and subsequent payments show that liabilities continue. Unsecured-loan additions require material addressing identity, creditworthiness and genuineness; confirmations, tax records and bank statements cannot be rejected without specific defects or contrary evidence. Material additional evidence may be considered where sufficient cause exists and its merits are examined without demonstrated prejudice; Rule 46A safeguards procedural fairness. CASS scrutiny parameters define the scope of scrutiny but do not independently establish taxable income.

Unreconciled jewellery found during a search falls within undisclosed income where it is unrecorded in regular records or not disclosed before the search, and no contemporaneous evidence establishes an earlier acquisition. An admission during a section 132(4) statement and subsequent inclusion as income support that characterisation. The concessional penalty framework applies where the income is admitted during search, the relevant asset and manner of earning are identified and substantiated, tax and interest are paid, and the amount is declared in the return. Identification of the unreconciled asset may sufficiently explain the unexplained investment when no further particulars are sought during search. Omission from the original return prevents full immunity but does not necessarily require the residuary penalty rate.

Section 68 requires an accommodation-entry provider to furnish beneficiary-wise particulars and supporting material to explain each bank credit. Identified beneficiary credits are confined to commission income, while credits left unexplained after verification are taxable as unexplained cash credits. Computerised data from the provider's own system forms part of its books, but departmental possession of raw data does not remove the provider's burden; reasonable access to relied-upon seized material and an opportunity to explain additions must be given. Section 37(1) denies deductions only for expenditure incurred for an offence or prohibited purpose, so legitimate routine operating expenses may be deducted in computing commission income despite the unlawful activity.

Payments to non-resident diamond grading and certification entities are not fees for technical services merely because the providers use specialised expertise, equipment or personnel. The relevant inquiry is the nature of the service received: independent reports on diamonds' physical characteristics, without advisory, consultancy, managerial, technical-solution, methodology, know-how or process transfer, do not constitute technical services. Where an applicable treaty requires technical knowledge, experience, skill, know-how or process to be made available, that condition is not met. As the charges are not taxable in India, Section 195 does not require tax deduction at source, and the related demand and interest do not survive.

Documented stock-exchange transactions supported by contract notes, demat records and actual consideration cannot be treated as artificial penny-stock losses solely on general investigation material, abnormal price movements or weak scrip fundamentals. Disallowance requires evidence specifically linking the taxpayer to manipulation or accommodation entries. A consequential unexplained-expenditure addition for alleged commission cannot stand without independent proof of commission expenditure. Interest on borrowings remains deductible where an interest-free advance to a related company is commercially expedient, connected with the taxpayer's business, and no diversion of interest-bearing funds for non-business purposes is established.

Unverifiable purchases may justify rejecting books of account to that extent where the supplier cannot be produced, stock records are lacking, and adverse information undermines purchase invoices. Where manufacturing, corresponding sales, and business use of goods are accepted, with no evidence that goods were not received or used, the full purchase value should not be taxed. The addition may instead be confined to the profit element from procurement through unrecorded sources; an estimate of 12.5% was treated as reasonable based on the disclosed gross-profit rate and consistent treatment of similar transactions.

Deduction for donations to an approved scientific research institution under Section 35(1)(ii) remains supportable where the donor substantiates payment through bank records, donation receipts, registration material and approval valid on the donation date. The recipient institution's failure to comply with a verification notice under Section 133(6) does not by itself disprove a genuine donation, absent evidence that funds were returned to the donor in cash. Subsequent withdrawal of the institution's approval does not retrospectively affect deductions for payments made while approval subsisted.

Convenience fee retention by an online ticket-booking platform does not attract tax deduction at source as commission or brokerage unless the platform receives consideration while acting on behalf of the theatre operator. Independent provision of booking, payment-processing and customer-facing services, ownership of customer data, assumption of operational and consumer-claim risks, and entitlement of the theatre operator only to ticket price plus a fixed per-ticket amount indicated no agency relationship. A cap on convenience charges and commercial coordination did not establish representative authority. Without an underlying commission obligation and agency relationship, retention could not constitute constructive payment. Consequently, no tax-deduction obligation or related interest liability arose.

Manpower-supply businesses may claim the employment-generation deduction for personnel they recruit, retain on their payroll and depute to client premises where they pay wages and statutory dues, control assignment, remuneration, discipline and termination, and remain responsible for labour-law compliance. Client-side daily supervision does not by itself displace the employer-employee relationship. Recovering wage costs plus a service margin through client invoices is a commercial arrangement and does not negate the supplier's independent wage and statutory obligations. The incentive should be construed liberally to advance employment generation, and consistent treatment may be relevant where identical claims were previously accepted without material factual or business changes.

Buy-back of a company's own shares below fair market value, followed by statutorily required extinguishment, constitutes a reduction of share capital rather than receipt of property for section 56(2)(x). Interest expenditure is not disallowable under section 36(1)(iii) where interest-free own funds exceed advances, borrowings lack nexus to those advances, and mixed funds alone cannot justify a proportionate disallowance. Loans written off qualify as bad debts under sections 36(1)(vii) and 36(2)(i) when they arise in the ordinary course of an organised money-lending business and are actually written off; a lending licence is not determinative.

Disputed stamp-duty valuation of jointly purchased immovable property, supported by the assessee's valuation material, requires a reference to the Departmental Valuation Officer before determining any taxable difference. The Assessing Officer must address a request for such reference and reconsider the valuation after providing a reasonable hearing. Where ownership shares are identified, the entire differential amount cannot be assessed in one co-owner's hands merely because the other co-owner's share was not assessed; taxation must reflect the respective ownership interests.

Expenditure written off on an abandoned manufacturing project may be deductible as business expenditure where the project expands an existing business rather than establishing a separate line of business. Failure to obtain water-supply approval and the absence of any completed capital asset or enduring advantage support revenue treatment. The expenditure's real commercial character prevails over its earlier classification as capital work-in-progress. The matching principle does not bar a statutory deduction merely because the expenditure was accumulated in prior years. The project write-off was therefore allowable in the relevant year.