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Income Tax Slab Calculator

Calculate your income tax slab liabilities under both the Old and New tax regimes for FY 2026-27 (AY 2027-28). Analyze slab-by-slab tax, rebate limits, and find how standard deductions affect your net tax.

Last Updated: June 2026Verified By: GSTWaala Editorial Team
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Calculator Inputs

Load Profile:
Interest, rental income, dividends, etc.
Leave blank to auto-apply standard deduction rules.

How to Use the Income Tax Slab Calculator

  1. Choose the Financial Year (FY 2026-27 default or FY 2025-26) to calculate correct slabs.
  2. Toggle between the New Tax Regime and the Old Tax Regime.
  3. Select your age category. This affects basic exemption slabs under the Old Regime.
  4. Enter your Gross Annual Salary and Other Income sources.
  5. If using the Old Regime, declare your eligible exemptions (Sec 80C, 80D, HRA, home loan interest).
  6. View the visual slab-by-slab calculator bars and the running totals tax breakdown table instantly.

Mathematical Formula & Calculations

Mathematical Formulas & Examples:

1. Taxable Income Formula:
Taxable Income = Gross Salary + Other Income - Standard Deduction - Eligible Exemptions

2. Cess Formula:
Cess = (Tax After Rebate + Surcharge) × 4%

3. New Regime Rebate u/s 87A (FY 2026-27):
If Taxable Income ≤ ₹12,00,000: Rebate = Tax Payable (up to ₹60,000).
If Taxable Income > ₹12,00,000: Marginal Relief applies if slab tax > (Taxable Income - ₹12,00,000).

Regime Slabs Comparison:
RateNew Regime SlabsOld Regime Slabs
0% (Nil)Up to ₹4,00,000Up to ₹2,50,000
5%₹4,00,001 - ₹8,00,000₹2,50,001 - ₹5,00,000
10% / 20%₹8,00,001 - ₹12,00,000 (10%)₹5,00,001 - ₹10,00,000 (20%)
15% / 30%₹12,00,001 - ₹16,00,000 (15%)Above ₹10,00,000 (30%)
20% / -₹16,00,001 - ₹20,00,000 (20%)-
25% / -₹20,00,001 - ₹24,00,000 (25%)-
30% / -Above ₹24,00,000 (30%)-

Ultimate Guide: Indian Income Tax Slabs & Calculations

1. What is Income Tax?

Income tax is a type of direct tax that individuals and entities pay to the government based on their earnings during a given financial year. In India, the Income Tax Department collects this tax under the provisions of the Income Tax Act of 1961. Direct taxation plays a key role in raising funds for public infrastructure, national defense, and social welfare programs. Income is classified under five main heads: Salary, House Property, Profits and Gains of Business or Profession (PGBP), Capital Gains, and Income from Other Sources.

2. Income Tax Slabs Explained

India follows a progressive taxation system where tax rates increase as taxable income rises. Tax slabs segment your total income into portions, applying specific tax percentages to each portion rather than taxing your entire income at a single rate. For example, under the New Tax Regime for FY 2026-27, the first ₹4 Lakh of taxable income is completely exempt from tax. The next ₹4 Lakh (₹4,00,001 to ₹8,00,000) is taxed at 5%, and subsequent portions are taxed at 10%, 15%, 20%, 25%, and 30%.

3. Old vs New Tax Regime

Taxpayers in India have the option to choose between two systems:

  • Old Tax Regime: Features higher tax slab rates but allows you to claim numerous exemptions and deductions under Section 80C, 80D, Section 24(b) (home loan interest), HRA exemptions, and NPS declarations. This regime rewards taxpayers who actively save, invest, and buy assets.
  • New Tax Regime: Features significantly lower tax slab rates and a higher rebate threshold (₹12 Lakh taxable income) but disallows almost all itemised exemptions and deductions. It is designed to simplify tax compliance, remove the hassle of documenting proofs, and leave more disposable income in taxpayers' hands.

4. Complete Worked Examples (FY 2026-27)

Let us look at 3 worked mathematical examples comparing tax under both regimes. We assume standard declarations of ₹2.5 Lakh under the Old Regime:

Example 1: Gross Salary of ₹8,00,000

  • Old Regime: Deductions: ₹50,000 (std) + ₹2,50,000 = ₹3,00,000. Taxable Income: ₹5,00,000. Tax calculated on ₹5 Lakh is exactly ₹12,500. Rebate u/s 87A is ₹12,500. Net Tax Payable = ₹0.
  • New Regime: Deductions: ₹75,000 (std). Taxable Income: ₹7,25,000. Tax on first ₹4L is Nil. Tax on ₹4L-₹7.25L @ 5% is ₹16,250. Since taxable income is under ₹12 Lakh, Section 87A rebate wipes it out. Net Tax Payable = ₹0.

Example 2: Gross Salary of ₹15,00,000

  • Old Regime: Deductions: ₹3,00,000. Taxable Income: ₹12,00,000. Slab Tax: 2.5-5L (12.5k) + 5-10L (1L) + 10-12L (60k) = ₹1,72,500. Cess (4%) = ₹6,900. Net Tax Payable = ₹1,79,400.
  • New Regime: Deductions: ₹75,000. Taxable Income: ₹14,25,000. Slab Tax: 4-8L (20k) + 8-12L (40k) + 12-14.25L (33.75k) = ₹93,750. Cess (4%) = ₹3,750. Net Tax Payable = ₹97,500.
  • Savings: The New Tax Regime saves you exactly ₹81,900.

Example 3: Gross Salary of ₹25,00,000

  • Old Regime: Deductions: ₹3,00,000. Taxable Income: ₹22,00,000. Slab Tax: 112.5k (up to 10L) + 3.6L (on 12L) = ₹4,72,500. Cess (4%) = ₹18,900. Net Tax Payable = ₹4,91,400.
  • New Regime: Deductions: ₹75,000. Taxable Income: ₹24,25,000. Slab Tax: 4-8L (20k) + 8-12L (40k) + 12-16L (60k) + 16-20L (80k) + 20-24L (1L) + 24-24.25L (7.5k) = ₹3,07,500. Cess (4%) = ₹12,300. Net Tax Payable = ₹3,19,800.
  • Savings: The New Tax Regime saves you ₹1,71,600.

5. Which Regime Should You Choose?

To choose the optimal regime, identify your total itemised exemptions. If your salary is ₹15 Lakh, the breakeven threshold is around ₹3.6 Lakh of deductions. If your declarations (like rent payments under HRA, NPS contributions, health insurance policies, and home loan interest) exceed this threshold, opt for the Old Regime. If not, the New Regime is more beneficial.

6. Tax Saving Tips for Indian Taxpayers

If you choose the Old Tax Regime, optimize your savings with these strategies:

  • Section 80C: Max out your limit of ₹1,50,000 using safe tax savers like Public Provident Fund (PPF), Equity Linked Saving Schemes (ELSS), or Voluntary Provident Fund (VPF).
  • National Pension System (NPS): Utilize Section 80CCD(1B) to invest ₹50,000 in NPS Tier-I, which is completely separate from Section 80C.
  • Health Protection: Secure your family with medical policies and claim up to ₹25,000 (or ₹50,000 for parents) under Section 80D.

7. Common Tax Filing Mistakes

  1. Incorrect regime selection during declaration: If you select the wrong regime with your employer, higher TDS might be deducted. However, you can switch back when filing your final ITR.
  2. Failing to declare HRA correctly: HRA requires rent receipts and landlord PAN details. Ensure these are verified.
  3. Mixing standard deduction rules: Remember that standard deduction is ₹75,000 under the New Regime and ₹50,000 under the Old Regime for salaried workers.

8. Explore More GSTWaala Financial Tools

Simplify your compliance and finance tasks with our other free, production-ready calculators:

Frequently Asked Questions

Income Tax is a direct tax levied by the Central Government of India on the annual income earned by individuals, businesses, HUFs, and other legal entities. The taxation process is regulated by the Income Tax Act of 1961, and rates vary based on income levels, tax slabs, and regimes selected.
Tax slabs are the progressive income brackets defined by the Ministry of Finance. As your income increases and crosses into higher slabs, that portion of your income is taxed at progressively higher rates (e.g., 5%, 10%, 15%, 20%, 25%, and 30%). This ensures a progressive direct tax system.
The New Tax Regime is the default option and is generally better for individuals who do not make heavy investments, as it offers lower slab rates, a ₹75,000 standard deduction, and a full Section 87A rebate up to ₹12 Lakh (nil tax up to ₹12.75 Lakh gross salary). The Old Regime is better only if your total itemised deductions (80C, 80D, HRA, home loan interest) exceed ₹3.75 Lakh to ₹4.25 Lakh.
The Health & Education Cess is calculated at a flat rate of 4% on the total income tax payable after accounting for any Section 87A tax rebates or surcharges. It is not calculated directly on your gross income.
Yes. Salaried individuals who do not have any business or professional income (under the head PGBP) are eligible to switch between the Old and New tax regimes every year at the time of filing their ITR. If you have business income, your choice to switch is a once-in-a-lifetime option.
Under the New Tax Regime for FY 2025-26 and FY 2026-27, Section 87A provides a full rebate of tax up to ₹60,000 if your net taxable income does not exceed ₹12,00,000, bringing your net tax liability before cess to zero.
Taxable Income under the Old Regime is calculated as: Gross Salary + Other Income - Standard Deduction (₹50,000) - Section 80C investments (up to ₹1.5L) - Section 80D medical (up to ₹25k/50k) - HRA tax exemption - NPS contributions (up to ₹50k) - Home loan interest (up to ₹2L).
Yes. Salaried individuals and pensioners are entitled to a standard deduction of ₹75,000 under the New Tax Regime. Under the Old Regime, the standard deduction is capped at ₹50,000.
No. Section 80C deductions are completely disallowed under the New Tax Regime. You must opt for the Old Tax Regime if you wish to claim these tax deductions.
No. House Rent Allowance (HRA) exemptions under Section 10(13A) are disallowed under the New Tax Regime. HRA exemptions are only available under the Old Tax Regime.
Section 80CCD(1B) allows an additional deduction of up to ₹50,000 for contributions made to the National Pension System (NPS) Tier-I account. This deduction is over and above the ₹1.5 Lakh limit of Section 80C, but is only available under the Old Tax Regime.
Under the New Tax Regime, the maximum surcharge rate is capped at 25% for taxable incomes exceeding ₹2 Crore. In the Old Regime, the maximum surcharge remains at 37% for incomes exceeding ₹5 Crore.
Marginal relief applies in the New Regime if your taxable income slightly exceeds ₹12 Lakh. It ensures that the tax payable (before cess) does not exceed the extra income earned above ₹12 Lakh, preventing a scenario where earning a small amount more results in a massive tax increase.
No. The New Tax Regime features a uniform basic exemption slab of ₹4 Lakh for all individuals, regardless of age. Higher basic exemption slabs for senior citizens (₹3 Lakh) and super seniors (₹5 Lakh) are only available under the Old Tax Regime.
No. Salaried professional tax paid (usually ₹2,400/year) is allowed as a deduction from gross salary only under the Old Tax Regime. It is disallowed under the New Tax Regime.

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Compliance Note

All calculations are updated to reflect the tax codes, slabs, and deductions in effect for Financial Year 2025-26 (Assessment Year 2026-27). This tool runs entirely client-side; no data is transmitted or stored on our servers.
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