How to Calculate Income Tax in India FY 2026-27: Step-by-Step with Worked Examples

How do you calculate income tax in India for FY 2026-27? Compute Gross Total Income across all five heads, subtract eligible deductions (old regime only), apply the applicable slab rates to arrive at tax before surcharge, add surcharge if income exceeds ₹50 lakh, then add 4% health and education cess. Under the new regime, income up to ₹12 lakh attracts zero net tax after the Section 87A rebate.

Income tax calculation in India follows a fixed sequence defined under the Income Tax Act, 1961. Whether you are a salaried employee, a business owner, or a retiree living on pension and fixed deposit interest, the five-step framework applies uniformly. The slabs, rebates, and standard deduction have changed significantly for FY 2026-27 (Assessment Year 2027-28), and understanding the exact numbers prevents both overpayment and ITR filing errors.

The 5-Step Framework for Calculating Income Tax in India

Every income tax computation begins with classifying income under the five heads recognised by the Income Tax Act, then working through the following sequence:

Step 1: Compute Gross Total Income (GTI) Add all income across the five heads:

• Salaries (including perquisites and allowances after exemptions)
• Income from House Property (net annual value after 30% standard deduction for let-out property)
• Profits and Gains from Business or Profession (PGBP)
• Capital Gains (short-term and long-term, computed separately with special rates)
• Income from Other Sources (FD interest, dividend above ₹10 lakh threshold, lottery winnings)

Step 2: Apply Chapter VI-A Deductions (old regime only) Under the old tax regime, deduct eligible amounts under sections such as 80C (up to ₹1.5 lakh), 80D (medical insurance), 80G (donations), and others. Under the new tax regime, these deductions are not available; only the standard deduction of ₹75,000 for salaried individuals and pensioners applies.

Step 3: Arrive at Total Taxable Income Total Taxable Income = GTI minus Chapter VI-A deductions (and minus standard deduction where applicable).

Step 4: Apply Slab Rates and Special Capital Gains Rates Apply the normal slab rates to the remaining income. Capital gains are taxed at special rates: long-term capital gains on listed equity above ₹1.25 lakh at 12.5%, short-term capital gains on listed equity at 20%, and other capital gains per applicable rates.

Step 5: Add Surcharge and Health & Education Cess If total income exceeds ₹50 lakh, a surcharge applies on the income tax computed in Step 4. Then add health and education cess at 4% on (income tax + surcharge). This gives the final tax payable.

New Tax Regime Slab Rates for FY 2026-27 (AY 2027-28)

The Finance Act 2025 revised the new regime slabs effective FY 2026-27. These are the rates applicable to individuals, HUFs, and firms opting for the new regime under Section 115BAC:

Key features: standard deduction of ₹75,000 for salaried employees and pensioners; Section 87A rebate wipes out tax liability when net taxable income does not exceed ₹12,00,000; salaried employees with gross salary up to ₹12,75,000 pay zero tax after the standard deduction reduces taxable income to ₹12,00,000.

Old Tax Regime Slab Rates for FY 2026-27

Standard deduction under the old regime is ₹50,000 for salaried employees. The Section 87A rebate under the old regime is ₹12,500, available only when total income does not exceed ₹5,00,000. The old regime permits Chapter VI-A deductions; for many taxpayers with large 80C, 80D, and HRA claims, it still computes lower tax than the new regime. See the old vs new tax regime comparison guide for a break-even analysis.

Surcharge and Health & Education Cess: How They Add Up

Surcharge is computed as a percentage of income tax (before cess) and depends on total income:

New Tax Regime:

Old Tax Regime:

The Marginal Relief provision prevents the incremental income above the surcharge threshold from being taxed more than the incremental income itself. After adding surcharge, health and education cess of 4% is applied to the combined amount. Cess has no minimum income threshold; it applies even if surcharge is zero.

Section 87A Rebate: When Your Tax Becomes Zero

Section 87A provides a tax rebate that reduces tax liability to zero for taxpayers below the income ceiling. For a full treatment of eligibility and edge cases, see the Section 87A rebate guide for AY 2026-27.

Under the new regime for AY 2027-28: if net taxable income (after standard deduction) does not exceed ₹12,00,000, the rebate equals the full tax computed on that income, making net tax payable nil. The rebate does not apply to special-rate income such as short-term capital gains on listed equities.

Under the old regime: the rebate is ₹12,500 and is available only when total income does not exceed ₹5,00,000.

Worked Example 1: Salaried Employee at ₹12 Lakh

Facts: Gross salary ₹12,00,000; new regime elected.

The employee pays zero income tax. The gross salary threshold for zero tax under the new regime for salaried employees is ₹12,75,000 (₹12L taxable after ₹75K deduction).

Worked Example 2: Salaried Employee at ₹15 Lakh (New Regime)

Facts: Gross salary ₹15,00,000; new regime.

The Section 87A rebate does not apply because taxable income (₹14.25L) exceeds ₹12L. For an evaluation of whether the old regime would reduce tax at this salary level given typical deduction profiles, the regime comparison guide provides a structured break-even table.

Worked Example 3: Business Owner at ₹30 Lakh Net Profit

Facts: Business net profit ₹30,00,000; new regime; no salary, no standard deduction available for business income.

No surcharge since income is below ₹50 lakh. Business owners must also compute advance tax instalments on this liability (15% by June 15, 45% by September 15, 75% by December 15, 100% by March 15). Review ITR filing plans at Tax Garden for assisted computation and filing.

Worked Example 4: Senior Citizen on Pension and FD Interest

Facts: Age 65; pension ₹5,00,000; FD interest ₹3,00,000; new regime; total income ₹8,00,000.

Pension is taxed as salary under the new regime; standard deduction of ₹75,000 applies.

The Section 87A rebate does not apply here because taxable income (₹7.25L) exceeds ₹12L? No: ₹7.25L is below ₹12L, so the rebate of ₹16,250 applies, and cess is levied on the post-rebate tax. Since the rebate equals the full tax, net tax is ₹0. The senior citizen pays zero income tax on this income combination under the new regime.

Note for old regime: the senior citizen basic exemption limit is ₹3,00,000 (not ₹2,50,000), and TDS on FD interest (Section 194A) has a higher threshold of ₹1,00,000 for senior citizens under Finance Act 2025 rules.

Quick Reference Table: Approximate Tax at Common Income Levels (New Regime, Salaried)

How to Verify Your Calculation Before Filing ITR

Three cross-checks prevent errors before you submit:

1. Form 16 vs. self-computed tax: The employer's tax deducted at source (TDS) shown in Part B of Form 16 should match your computed tax. Differences arise when the employer used the old regime but you elect the new regime in ITR, or vice versa.

2. Form 26AS and AIS: The Annual Information Statement lists all income reported to the tax department: salary TDS, FD interest TDS, dividend, property transactions, and securities transactions. Reconcile your GTI with AIS line items before computing tax.

3. Advance tax reconciliation: If you had business or investment income beyond salary, verify that advance tax paid (from challan 280) matches the instalments due. Shortfall attracts interest under Sections 234B and 234C.

The Income Tax Department's e-filing portal offers a built-in tax calculator, but it does not account for marginal relief on surcharge, special capital gains rates, or regime-optimisation scenarios. A practitioner review catches these differences before filing.

Frequently Asked Questions

What is the income tax on a ₹10 lakh salary under the new regime for FY 2026-27?

For a salaried employee with gross salary of ₹10 lakh, the standard deduction of ₹75,000 reduces taxable income to ₹9.25 lakh. Tax on ₹9.25 lakh works out to ₹32,500 (nil on ₹4L, 5% on ₹4L to ₹8L = ₹20,000, 10% on ₹8L to ₹9.25L = ₹12,500). Since taxable income is below ₹12 lakh, the Section 87A rebate covers the full ₹32,500, making net tax payable zero.

Is the Section 87A rebate automatically applied, or do I need to claim it separately?

The rebate under Section 87A is applied automatically by the ITR filing system when your net taxable income is within the eligible limit (₹12 lakh under the new regime, ₹5 lakh under the old regime). You do not need to claim it in a separate schedule. However, the rebate does not apply to special-rate income such as short-term capital gains on listed equities under Section 111A, even if total income is below the threshold.

How does surcharge affect my tax if my income crosses ₹50 lakh?

Surcharge is an additional charge on the income tax itself (not on income). Under the new regime, crossing ₹50 lakh triggers a 10% surcharge on the tax computed at slab rates. On an income of ₹55 lakh, for example, the tax is approximately ₹13.1 lakh; surcharge at 10% adds ₹1.31 lakh; then 4% cess is applied on the combined ₹14.41 lakh, giving total liability of about ₹14.98 lakh. Marginal relief prevents the tax on the ₹5 lakh above ₹50 lakh from exceeding ₹5 lakh itself.

Should I choose the old or new tax regime for FY 2026-27?

The new regime is generally beneficial for taxpayers with limited deductions. Salaried employees with total Chapter VI-A deductions (80C + 80D + HRA + other) below approximately ₹3.75 lakh for incomes in the ₹15 to ₹20 lakh range will pay less tax under the new regime. Taxpayers with home loan interest, large HRA exemptions, and full 80C utilisation often find the old regime more beneficial. The break-even point shifts by income level; a regime-specific computation is the only reliable method.

This article is based on the Finance Act 2025 provisions applicable to FY 2026-27 (AY 2027-28). Slab rates, rebate limits, and surcharge thresholds are sourced from the Income Tax Act, 1961 as amended. The worked examples assume no capital gains income unless stated. Taxpayers with equity investments, property transactions, or foreign income should obtain a separate computation for those components.