What Is an Income Tax Calculator India?

An Income Tax Calculator India estimates tax payable by applying Indian income tax slabs, deductions, rebate, surcharge, and cess to a taxpayer’s income. This calculator is designed for FY 2025-26 / AY 2026-27 and also includes FY 2024-25 / AY 2025-26 comparison support. It helps salaried individuals, pensioners, freelancers, and taxpayers compare the old tax regime and new tax regime.

The Income Tax Department states that the new tax regime under section 115BAC is the default regime for eligible taxpayers, while eligible taxpayers can opt out and choose the old regime. This makes comparison important because the lower-tax regime depends on income level, deductions, exemptions, age, and eligibility.

Core Income Tax Formula

The basic income tax formula is:

\[ Gross\ Total\ Income = Salary + Other\ Income + House\ Property + Business + Interest \]

\[ Taxable\ Income = Gross\ Total\ Income - Eligible\ Deductions \]

\[ Gross\ Tax = Slab\ Tax(Taxable\ Income) \]

\[ Tax\ After\ Rebate = Gross\ Tax - Rebate \]

\[ Final\ Tax = Tax\ After\ Rebate + Surcharge + Cess \]

This calculator applies the formula separately under the old regime and new regime because deductions and slabs differ.

New Tax Regime Slabs for FY 2025-26 / AY 2026-27

For FY 2025-26 / AY 2026-27, the new regime slabs for individuals are:

For salaried taxpayers, the standard deduction commonly used in FY 2025-26 planning under the new regime is ₹75,000. Rebate under Section 87A under the new regime can make normal taxable income up to ₹12,00,000 effectively tax-free for eligible resident individuals, with simplified marginal relief around the threshold in this calculator.

Old Tax Regime Slabs

The old tax regime keeps traditional deductions and exemptions such as Section 80C, Section 80D, HRA, home loan interest, and other deductions where eligible. The basic old-regime slabs depend on age.

Old Regime vs New Regime

The new regime usually has lower slab rates and fewer deductions. The old regime usually has higher slab rates but allows many deductions and exemptions. A taxpayer with very few deductions may benefit from the new regime. A taxpayer with large deductions, HRA, home loan interest, Section 80C, Section 80D, NPS, and other eligible deductions may still find the old regime competitive.

The comparison formula is:

\[ Tax\ Saving = Higher\ Tax - Lower\ Tax \]

The better regime is the one with lower final tax after rebate, surcharge, and cess.

Section 87A Rebate

Section 87A rebate can reduce tax for eligible resident individuals. Under the old regime, the common rebate is up to ₹12,500 when taxable income is up to ₹5,00,000. Under the new regime for FY 2025-26, normal taxable income up to ₹12,00,000 can be covered by rebate up to ₹60,000, subject to eligibility and special-income limitations.

Rebate estimate formula:

\[ Tax\ After\ Rebate = \max(0, Slab\ Tax - Rebate) \]

This calculator treats special-rate income separately because some special-rate income may not receive the same rebate treatment.

Health and Education Cess

Health and education cess is generally calculated at 4% of income tax plus surcharge:

\[ Cess = (Income\ Tax + Surcharge)\times4\% \]

The final tax formula is:

\[ Final\ Tax = Income\ Tax + Surcharge + Cess \]

Surcharge

Surcharge can apply at high income levels. This calculator includes a simplified automatic surcharge estimate. In the new regime, the highest surcharge on certain income can be capped differently compared with the old regime. Surcharge and marginal relief can be complex, especially when income includes capital gains or special-rate income. For high-income taxpayers, professional calculation is recommended.

Standard Deduction

Standard deduction reduces salary or pension income before tax calculation. This calculator includes editable standard deduction fields:

\[ Taxable\ Salary = Salary - Standard\ Deduction \]

For FY 2025-26 planning, the calculator uses ₹75,000 under the new regime and ₹50,000 under the old regime by default. These fields are editable to support future changes.

Worked Example: New Regime

Suppose gross salary is ₹12,75,000 and standard deduction under the new regime is ₹75,000.

\[ Taxable\ Income = 12,75,000 - 75,000 = 12,00,000 \]

Slab tax before rebate under FY 2025-26 new regime:

\[ 0\% \text{ on first } 4,00,000 = 0 \]

\[ 5\% \text{ on next } 4,00,000 = 20,000 \]

\[ 10\% \text{ on next } 4,00,000 = 40,000 \]

\[ Gross\ Tax = 60,000 \]

If eligible for Section 87A rebate:

\[ Tax\ After\ Rebate = 60,000 - 60,000 = 0 \]

Worked Example: Old Regime

Suppose gross salary is ₹12,75,000, standard deduction is ₹50,000, 80C is ₹1,50,000, 80D is ₹25,000, and NPS 80CCD(1B) is ₹50,000.

\[ Taxable\ Income = 12,75,000 - 50,000 - 1,50,000 - 25,000 - 50,000 = 10,00,000 \]

For a taxpayer below 60 under old regime:

\[ Tax = 12,500 + 20\%\times(10,00,000-5,00,000)=1,12,500 \]

Cess:

\[ Cess = 1,12,500\times4\%=4,500 \]

Final tax:

\[ Final\ Tax = 1,12,500 + 4,500 = 1,17,000 \]

Common Deductions Under Old Regime

New Regime Limitations

The new regime generally does not allow many traditional deductions and exemptions, though some items such as standard deduction and employer NPS contribution may be available subject to law and conditions. This calculator therefore applies only standard deduction and employer NPS under the new-regime deduction model.

How to Use This Calculator

1. Select financial year and regime mode.
2. Choose age category.
3. Enter salary, interest, rental, business, and other income.
4. Enter special-rate income separately if applicable.
5. Enter standard deduction, Section 80C, Section 80D, NPS, HRA, home loan interest, employer NPS, and other deductions.
6. Select residential status and rebate options.
7. Click Calculate Income Tax.
8. Review old-regime tax, new-regime tax, better regime, tax saving, taxable income, slab breakdown, and formula steps.

Common Mistakes

Why This Page Does Not Include Exam Score Tables

An Income Tax Calculator India is a finance and tax-estimation tool, not an exam score calculator. Score guidelines, score tables, and next exam timetables do not apply directly to this page. The equivalent useful material is current tax slabs, rebate rules, cess and surcharge logic, old-vs-new regime comparison, deduction explanation, worked examples, and slab breakdown.

Suggested internal links: salary calculator, HRA calculator, 80C calculator, old vs new tax regime calculator, capital gains tax calculator, budget calculator, and personal finance calculators.