Corporate Tax Advisory in India: MAT, Section 40(a) Disallowances & AI Scrutiny

23 Jan 2026

Updated: May 2026

Corporate Tax Advisory in India: MAT, Section 40(a) Disallowances, and Strategic Compliance

Corporate taxation in India involves a layered set of provisions that go well beyond applying the headline rate to book profits. For finance teams and business owners, the most consequential areas are the applicable tax rate regime, Minimum Alternate Tax under Section 115JB, the extensively litigated disallowances under Section 40(a), and the disciplined management of advance tax and transfer pricing obligations. This guide covers the statutory framework and practical implications of each.

Corporate Tax Rates: Choosing the Right Regime

Domestic companies operate under three possible rate structures:

• Section 115BAA — 22% flat rate: Available to all existing domestic companies that forego specified deductions and exemptions (80-IC, 80-IE, SEZ deductions, additional depreciation, etc.). Once opted, the regime is irrevocable. Effective tax rate including 10% surcharge and 4% cess: approximately 25.17%.
• Section 115BAB — 15% flat rate: Available to new manufacturing companies incorporated on or after 1 October 2019 and commencing manufacturing before the applicable sunset date. Effective rate including surcharge and cess: approximately 17.01%.
• Default rate — 30%: For companies not opting 115BAA or 115BAB, with surcharge at 7% for income between ₹1 crore and ₹10 crore and 12% above ₹10 crore, plus 4% cess. This route retains access to deductions under Chapter VI-A and other incentive provisions.

Companies under Sections 115BAA and 115BAB are exempt from Minimum Alternate Tax — a significant structural advantage when book profits are high relative to taxable income.

Minimum Alternate Tax: Section 115JB

MAT applies to companies not covered under Sections 115BAA or 115BAB. The rate is 15% of Book Profit as defined under Section 115JB, before surcharge and cess. Book Profit is not the same as net profit per the P&L account — it requires specific adjustments prescribed under Section 115JB(2).

Additions to net profit to arrive at Book Profit:

• Income tax paid or payable and deferred tax charged to P&L
• Provisions for unascertained liabilities and contingent losses
• Provisions for bad and doubtful debts (if not written off)
• Depreciation computed under the Companies Act, 2013 (charged back to P&L)

Deductions from net profit:

• Actual depreciation allowable under the Companies Act
• Brought-forward book losses or unabsorbed depreciation (whichever is lower)
• Exempt income (e.g., dividend income under applicable provisions)

When MAT liability exceeds normal tax, the excess is available as MAT Credit under Section 115JAA, carried forward for up to 15 years and set off in any future year when normal tax exceeds MAT liability. MAT credit is a valuable balance sheet asset for capital-intensive companies in early years and must be correctly tracked and disclosed in financial statements.

Section 40(a) Disallowances: The Most Litigated Area in Corporate Tax Assessments

Section 40(a) disallowances arise from non-deduction or non-deposit of TDS against expense payments. This is consistently among the highest-volume additions made by Assessing Officers in corporate assessments.

Section 40(a)(ia): 30% of any sum payable to a resident on which TDS was not deducted, or was deducted but not deposited with the Government by the due date of filing the return. Covered payments include salary, contractor payments (Section 194C), professional fees (Section 194J), rent (Section 194I), and interest (Section 194A). The 30% disallowance applies even where the payee has declared the income in their own return.

Section 40(a)(i): 100% disallowance for any sum paid to a non-resident on which TDS was not deducted under Section 195. This is the more severe provision and applies regardless of whether the payment was for royalty, interest, technical services fees, or any other income deemed to accrue in India.

Remedy: If TDS is deducted and deposited in a subsequent year before the due date of filing the return for that year, the deduction is allowed in the year of deduction. This creates an incentive for late but voluntary compliance — protecting deductibility of the expense, albeit with interest liability under Section 201(1A).

Section 40(a)(ii): Rates and taxes paid in India (including income tax and wealth tax) are not deductible as business expenses.

Section 40(a)(iii): Salary paid to an employee outside India without TDS deduction is fully disallowed — directly relevant for companies with expatriate employees or offshore payroll structures.

Section 43B: Expenses Deductible Only on Actual Payment

Regardless of method of accounting, the following expenses are deductible only in the year of actual payment — not on accrual:

• PF, ESIC, gratuity, and other employee welfare fund contributions
• Interest on loans from scheduled banks, public financial institutions, and the government
• Leave encashment
• MSME dues — Section 43B(h): Payments to Micro and Small Enterprises must be made within 45 days of acceptance of goods or services (15 days where no written agreement exists). Outstanding MSME dues beyond this period are disallowed until the year of actual payment. A creditor ageing review for MSME vendors is now an essential part of year-end tax planning.

Transfer Pricing: Sections 92 to 92F

Transfer pricing provisions apply to international transactions between associated enterprises and specified domestic transactions. Every such transaction must be at arm's length price, computed using one of the prescribed methods under Section 92C: Comparable Uncontrolled Price (CUP), Resale Price Method (RPM), Cost Plus Method (CPM), Profit Split Method (PSM), or Transactional Net Margin Method (TNMM). Where aggregate international transactions exceed ₹1 crore, a Transfer Pricing Study and Form 3CEB (accountant's report) are mandatory.

Advance Tax for Companies

Companies pay advance tax in four instalments under Sections 207 to 211:

• 15 June: at least 15% of assessed income
• 15 September: at least 45% of assessed income
• 15 December: at least 75% of assessed income
• 15 March: 100% of assessed income

Interest under Sections 234B and 234C applies to shortfall in advance tax. For companies subject to MAT, advance tax must be computed on whichever is higher — normal tax liability or MAT liability — at each instalment date.

For comprehensive corporate tax advisory including MAT credit optimisation, Section 40(a) risk assessment, and transfer pricing documentation, visit www.smeadvisory.in.

Regi Tom Antony And Associates is a Chartered Accountant firm in Kakkanad, Kochi, providing corporate tax advisory, statutory audit, transfer pricing, MAT planning, and advance tax management for companies across Kerala and India. Write to us at letstalk@rtaandassociates.com.