Part 1: Income Tax Slabs, Regimes & The Basics (FY 2026-27)

Before you can save a single rupee on taxes, you need to understand how the Indian income tax system works. This part lays the absolute foundation — the tax slabs, the two regimes, and the critical first decisions you need to make every financial year.

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🏛️ The Two Regimes: A Fork in the Road

Since FY 2020-21, India has offered taxpayers a choice between two fundamentally different tax frameworks. As of FY 2026-27, the New Tax Regime is the default. You do not need to do anything to opt into it. However, if you want the Old Tax Regime, you must actively choose it during your tax declaration at the start of the financial year.

New Tax Regime — Lower Rates, Fewer Deductions

The New Tax Regime offers significantly lower tax rates, but strips away almost all deductions and exemptions. The philosophy is simple: “We will tax you less, but you cannot deduct anything.”

Tax Slabs (FY 2026-27, New Regime):

Taxable Income (₹)	Tax Rate
Up to 4,00,000	Nil
4,00,001 to 8,00,000	5%
8,00,001 to 12,00,000	10%
12,00,001 to 16,00,000	15%
16,00,001 to 20,00,000	20%
20,00,001 to 24,00,000	25%
Above 24,00,000	30%

Key Feature — The ₹12 Lakh Rebate (Section 87A): If your total taxable income under the New Regime is ₹12,00,000 or below, you pay zero tax thanks to the rebate under Section 87A. This is an extraordinarily powerful benefit for early-career professionals.

Standard Deduction: ₹75,000 (flat deduction from salary income, no proof needed).

Deductions Allowed in New Regime:

• Standard Deduction (₹75,000)
• Employer’s contribution to NPS under Section 80CCD(2) (up to 14% of Basic + DA)
• That’s it. No 80C, no 80D, no HRA, no home loan interest.

Old Tax Regime — Higher Rates, Maximum Deductions

The Old Tax Regime taxes you at higher rates but allows you to claim a vast array of deductions and exemptions (80C, 80D, HRA, home loan, NPS, LTA, etc.).

Tax Slabs (FY 2026-27, Old Regime):

Taxable Income (₹)	Tax Rate
Up to 2,50,000	Nil
2,50,001 to 5,00,000	5%
5,00,001 to 10,00,000	20%
Above 10,00,000	30%

Standard Deduction: ₹50,000 (lower than the New Regime).

Why choose Old? If your total deductions (80C + 80D + HRA + Home Loan + NPS + LTA etc.) add up to a significant amount (typically exceeding ₹8-9 Lakhs), the Old Regime can result in a lower final tax bill despite the higher slab rates.

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📊 The Surcharge & Cess Layer

On top of your base tax, the government levies:

• Health & Education Cess: 4% on total income tax (applies to both regimes).
• Surcharge: Applicable if your total income exceeds ₹50 Lakhs.
  • ₹50L to ₹1Cr: 10% surcharge
  • ₹1Cr to ₹2Cr: 15% surcharge
  • ₹2Cr to ₹5Cr: 25% surcharge
  • Above ₹5Cr: 37% surcharge

This means the effective maximum tax rate in India is approximately 42.74% for ultra-high earners under the old regime (30% tax + 37% surcharge + 4% cess).

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🎯 The Decision Framework: New vs Old?

Here is a quick decision tree:

1. Is your gross income below ₹12.75 Lakhs? Choose the New Regime. After the ₹75,000 standard deduction, your taxable income is ₹12 Lakhs or less, and the Section 87A rebate makes your tax liability zero.

2. Is your gross income between ₹12.75 Lakhs and ₹25 Lakhs? Calculate your total deductions. If they exceed ₹4 to ₹5 Lakhs (80C + 80D + HRA + NPS etc.), the Old Regime will likely save you more. Otherwise, stay with the New Regime.

3. Is your gross income above ₹25 Lakhs? You almost certainly need the Old Regime if you are maximizing every possible deduction (especially HRA for metro-city employees and home loan interest). Run the numbers in a tax calculator to be sure.

We will dive into a complete, detailed comparison with actual salary breakdowns in Part 8.

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💼 Understanding Your Salary Structure

Your CTC (Cost to Company) is not your taxable income. Here is how a typical IT salary breaks down:

• Basic Salary: Usually 40-50% of CTC. This is fully taxable.
• House Rent Allowance (HRA): Partially or fully exempt depending on rent paid and city of residence (covered in Part 4).
• Special Allowance: Fully taxable.
• Employer PF Contribution: Not taxable up to 12% of Basic.
• Employer NPS Contribution: Not taxable up to 14% of Basic + DA (available in both regimes!).
• Leave Travel Allowance (LTA): Exempt on actual travel expenses (Old Regime only).
• Reimbursements (Food, Telephone, Internet): Tax-free up to limits if supported by bills.

Pro Tip for TCS/IT Employees: If your company allows you to restructure your salary, always maximize your Basic (for higher PF and gratuity) and HRA (for higher exemption under Old Regime). Speak to your HR portal about this during your annual declaration.

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📅 Key Tax Calendar Dates (FY 2026-27)

Date	Event
April 1, 2026	Financial Year begins. Submit tax regime choice to employer.
June 15, 2026	First Advance Tax installment due (if applicable).
July 31, 2026	ITR filing deadline for salaried individuals.
September 15, 2026	Second Advance Tax installment due.
December 31, 2026	Deadline for belated ITR filing (with late fee).
March 31, 2027	Deadline for revised return filing. Last day to make 80C investments.

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Summary

This part established the foundation. You now understand the two regimes, the tax slabs, the surcharge and cess structure, and your salary components. In the next part, we dive into the most famous section in Indian tax law — Section 80C — and explore every single instrument that qualifies for the ₹1.5 Lakh deduction.

Next: Part 2 — Section 80C: The ₹1.5 Lakh Shield →

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