Corporate Tax Slabs 2026: Old Rates vs New 22% Regime (Sec 115BAA)

Key Takeaways

• Significant Rate Reduction: The new default regime under the proposed Direct Tax Code 2025 offers a substantially lower base corporate tax rate of 22%, compared to the 30% primary rate under the old Income Tax Act, 1961.
• Elimination of Key Deductions: To access the lower tax rate, companies must forego a comprehensive list of exemptions and deductions, including those for Special Economic Zones (SEZ) under Sec 10AA, additional depreciation, and various investment-linked deductions.
• Exemption from MAT: A major compliance benefit of the new scheme is the complete exemption from the provisions of Minimum Alternate Tax (MAT), which was a significant consideration for capital-intensive companies under the old regime.
• Irrevocable Choice: The decision to transition to the new, lower-rate regime is permanent. Once a company opts in, it cannot revert to the old structure in subsequent financial years, making the initial analysis critical.

PART 1: EXECUTIVE SUMMARY

This guide outlines the critical transition for domestic corporate taxpayers from the legacy framework of the Income Tax Act, 1961, to the new default tax regime, modeled on the principles proposed for the Direct Tax Code 2025 and currently available under Section 115BAA. The transition represents a fundamental shift in corporate taxation philosophy, moving from a high-rate, incentive-based system to a simplified, lower-rate structure with fewer exemptions.

• The Old Law (1961): Previously, domestic companies were primarily taxed at a base rate of 30% (or 25% for companies with turnover up to ₹400 crore), plus applicable surcharge and cess. This regime allowed for a multitude of deductions and incentives aimed at encouraging specific economic activities. However, it also mandated compliance with the Minimum Alternate Tax (MAT) under Section 115JB, calculated on book profits if the normal tax liability fell below a certain threshold.

• The New Law (2025): The new default scheme offers a concessional tax rate of 22%, plus a standard 10% surcharge and 4% cess, resulting in an effective tax rate of 25.168%. This benefit is contingent upon the company forgoing a specified list of deductions and exemptions. A significant advantage of this new regime is the complete exemption from MAT.

• Who is Impacted: This change impacts all domestic companies. The decision is most critical for:

  • Companies with low to moderate reliance on tax incentives, who may find the lower headline rate immediately beneficial.
  • Capital-intensive companies or those with large book profits but low taxable income under the old regime, for whom the MAT exemption is a major relief.
  • Businesses in SEZs or those claiming significant investment-linked deductions, who must perform a rigorous cost-benefit analysis before transitioning.

PART 2: DETAILED TAX ANALYSIS

1. The Regime Transition Context

The move towards the new tax structure, which we refer to as the Default 2025 Scheme, is driven by the government's objective to simplify the tax code, reduce litigation, and align India's corporate tax rates with global standards. This new scheme is not a newly proposed concept but is embodied in the existing Section 115BAA of the Income Tax Act, 1961. The "transition" is the strategic decision each company must make to shift from the old, deduction-heavy regime to this streamlined, lower-rate alternative. The core trade-off is clear: a lower tax rate in exchange for surrendering specified tax benefits. A pivotal aspect of this context is the role of Minimum Alternate Tax (MAT). MAT was introduced to ensure that companies claiming substantial exemptions, resulting in low to nil taxable income, still paid a minimum amount of tax on their book profits. By opting for the Default 2025 Scheme (Section 115BAA), companies are entirely removed from the MAT provisions, simplifying compliance and potentially unlocking significant cash flow.

2. Detailed Comparison: Old Scheme vs Default 2025 Scheme

The choice between the two regimes has profound financial implications. Below is a detailed comparative analysis:

3. Break-Even Mathematical Analysis

The decision to transition hinges on a critical break-even point. A company benefits from the Default 2025 Scheme if the tax saved from the lower rate exceeds the tax shield lost from the surrendered deductions.

The Core Calculation: A company should consider transitioning if: Tax on Taxable Income (Old Rate) - Tax on Taxable Income (New Rate) > Tax Benefit of Foregone Deductions

Simplified Analysis: Let's consider a company with a turnover exceeding ₹400 crore and total income over ₹10 crore, making its effective old tax rate 34.944%. The new effective rate is 25.168%.

• Tax Rate Differential: 34.944% - 25.168% = 9.776%

The company forgoes deductions that would have saved tax at the old rate of 34.944%. The break-even point is reached when the value of the foregone deductions as a percentage of pre-tax profit results in a tax shield equal to the savings from the rate cut.

Illustrative Scenarios:

• Company A: Low Deductions

  • Profit Before Tax & Deductions: ₹100 Crore
  • Foregone Deductions: ₹5 Crore
  • Old Regime: Taxable Income = ₹95 Cr. Tax @34.944% = ₹33.20 Cr
  • New Regime: Taxable Income = ₹100 Cr. Tax @25.168% = ₹25.17 Cr
  • Decision: The new regime is clearly beneficial. The tax saving is over ₹8 Crore.

• Company B: High Deductions (e.g., SEZ Unit or High Capex)

  • Profit Before Tax & Deductions: ₹100 Crore
  • Foregone Deductions: ₹40 Crore (e.g., from Sec 10AA)
  • Old Regime: Taxable Income = ₹60 Cr. Tax @34.944% = ₹20.97 Cr
  • New Regime: Taxable Income = ₹100 Cr. Tax @25.168% = ₹25.17 Cr
  • Decision: The old regime is significantly more favorable. The tax outgo is lower by over ₹4 Crore.

The critical factor is the quantum of deductions. Companies with deductions forming a substantial portion of their profits (roughly >25-30%) will likely find the old regime more tax-efficient. Conversely, companies with lower deduction claims will benefit from the straightforward rate reduction.

4. How to Opt-Out (If Applicable)

The language surrounding this choice can be confusing. It is more accurate to frame it as "How to Opt-In" to the new scheme, as the old regime remains the default until a conscious choice is made.

• The Mechanism: A domestic company must exercise the option to be taxed under Section 115BAA.
• Prescribed Form: This choice is made by electronically filing Form 10-IC.
• Timeline: The form must be submitted on or before the due date for filing the income tax return (ITR) under section 139(1) for the financial year in which the company wishes to start availing the new rate.
• Irrevocability: This is the most critical compliance point. Once Form 10-IC is submitted and the company is assessed under Section 115BAA for a given year, the choice is binding for all subsequent assessment years. There is no provision to "opt-out" and return to the old regime.

5. Final Recommendation

The transition to the Default 2025 Scheme (Sec 115BAA) is a strategic, one-time decision that requires careful financial modeling.

1. For Service-Based and Low-Deduction Companies: Our team strongly recommends a swift evaluation and likely transition to the new scheme. The benefit of the ~25.17% flat tax rate and exemption from MAT compliance is immediate and substantial for companies that do not rely on the specific deductions disallowed under the new regime.

2. For Manufacturing, Infrastructure, and SEZ-Based Companies: A highly cautious approach is warranted. These companies must project their capital expenditure, R&D spending, and SEZ-related profits for the foreseeable future. The loss of benefits like additional depreciation and Section 10AA exemptions can easily outweigh the gains from a lower tax rate. The lapsing of any available MAT credit must also be factored into the financial cost of the transition.

3. Final Assessment: The decision should not be based on a single year's data. We advise a multi-year projection (at least 5 years) of taxable income and tax liability under both scenarios. This analysis must quantify the value of deductions that will be forfeited and compare it against the savings from the tax rate reduction. If the company has significant brought-forward MAT credit, its write-off upon transition is a real financial cost that must be considered.

This guide recommends that all domestic companies undertake a comprehensive review with their tax advisors to mathematically determine the most advantageous path forward before the due date for filing their next return.

💡 Tax Planning Tip: Use a reliable tax calculator to check your break-even point between the Old and New Regime in 2026.