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Guide · Income Tax

Income Tax in India —
A Complete Beginner's Guide

What income tax is, the five heads of income, new vs old regime slabs for FY 2025-26 (AY 2026-27), the ₹12.75 lakh zero-tax point for salaried, ITR forms and due dates.

TaxClue Editorial Desk Updated 18 August 2026 6 min read 17 FAQs answered
Updated for AY 2026-27 CA Reviewed New Regime Default
Quick Answer

Income tax is a direct tax the central government levies on the income you earn in a financial year — from salary, business, property, capital gains and other sources. For FY 2025-26 (AY 2026-27) the new regime is the default: a Section 87A rebate makes tax NIL up to ₹12,00,000 taxable income, so a salaried person pays zero tax up to about ₹12.75 lakh after the ₹75,000 standard deduction.

Salaried zero-tax ₹12.75L
Basic exemption (new) ₹4L
Standard deduction ₹75,000
Top rate 30%
The basics

Who Administers Income Tax in India?

Income tax is now governed by the Income-tax Act, 2025 — the consolidated, renumbered successor to the Income-tax Act, 1961, applicable from AY 2026-27. It is administered by the Central Board of Direct Taxes (CBDT) under the Department of Revenue, Ministry of Finance. All filings, payments and communications happen on the official portal incometax.gov.in.

Tax is charged on the income of a financial year (FY) and assessed in the following assessment year (AY). So income earned between 1 April 2025 and 31 March 2026 (FY 2025-26) is assessed in AY 2026-27, with returns generally due by 31 July 2026.

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How income is classified

The Five Heads of Income

All income is grouped under five heads. Your Gross Total Income is the sum across all heads (after set-off of losses); deductions are then subtracted to reach Net Taxable Income.

Head of IncomeWhat it CoversExamples
1. SalariesRemuneration for employmentSalary, HRA, bonus, gratuity, pension
2. House PropertyIncome from owning propertyRent received; home-loan interest deduction
3. Business / ProfessionProfits from trade, commerce or a professionShopkeeper profit, freelancer fees, CA/doctor income
4. Capital GainsProfit on sale of capital assets (STCG / LTCG)Shares, mutual funds, property, gold
5. Other SourcesResidual head — income not in the aboveFD/savings interest, dividends, lottery, gifts > ₹50,000

Gross Total Income − deductions = Net Taxable Income, on which slab rates apply.

Step by step

How Income Tax Is Calculated

Add all headsSalary + house + business + gains + other
Less deductionsStd deduction; 80C etc. (old regime)
Apply slab ratesNew or old regime slabs
Rebate & cess87A rebate, 4% cess, less TDS

After slab tax, add a 4% Health & Education Cess (and surcharge if income exceeds ₹50 lakh), subtract the Section 87A rebate, then subtract TDS and advance tax already paid. The balance is tax payable — or a refund if you paid excess. Try our income tax calculator to estimate it.

Default regime

New Tax Regime Slabs — FY 2025-26 (AY 2026-27)

The new regime is the default for FY 2025-26. These are the slab rates for individuals (a ₹75,000 standard deduction applies to salary/pension income):

Taxable IncomeTax Rate
Up to ₹4,00,000Nil
₹4,00,001 – ₹8,00,0005%
₹8,00,001 – ₹12,00,00010%
₹12,00,001 – ₹16,00,00015%
₹16,00,001 – ₹20,00,00020%
₹20,00,001 – ₹24,00,00025%
Above ₹24,00,00030%

Add 4% Health & Education Cess. Surcharge applies above ₹50L (capped at 25% in the new regime). Full table at /income-tax-slabs.

Zero tax up to ₹12.75 lakh — how it works

The Section 87A rebate makes tax NIL up to ₹12,00,000 of taxable income under the new regime. A salaried person also gets a ₹75,000 standard deduction, so gross salary up to about ₹12.75 lakh can attract zero tax. Above that, the rebate no longer applies and normal slab tax is due (with marginal relief just past ₹12L).

Salaried · ₹12.75L gross (new regime)

Gross salary₹12,75,000
Less standard deduction₹75,000
Taxable income₹12,00,000
Tax before rebate₹60,000
Section 87A rebate−₹60,000
Tax payable₹0

Salaried · ₹16L gross (new regime)

Gross salary₹16,00,000
Less standard deduction₹75,000
Taxable income₹15,25,000
Tax (slabs)₹1,08,750
+ 4% cess₹4,350
Tax payable≈ ₹1,13,100

See the exact tax on your salary for AY 2026-27.

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Choose wisely

Old Regime vs New Regime

The new regime has lower slab rates but almost no deductions. The old regime is optional — it keeps Chapter VI-A deductions (80C, 80D etc.) and HRA, with a ₹50,000 standard deduction and 87A rebate up to ₹5 lakh.

New

New regime (default)

  • Lower slab rates; nil up to ₹4L
  • 87A rebate → nil tax up to ₹12L taxable
  • ₹75,000 standard deduction
  • Most deductions (80C, HRA) not allowed
  • Best if you invest/claim little
vs
Old

Old regime (optional)

  • Slabs: 2.5L nil / 5% / 20% / 30%
  • 87A rebate up to ₹5L taxable
  • ₹50,000 standard deduction
  • 80C, 80D, HRA, home-loan interest allowed
  • Best with large deductions/rent/home loan
Taxable Income (Old Regime)Tax Rate
Up to ₹2,50,000Nil
₹2,50,001 – ₹5,00,0005%
₹5,00,001 – ₹10,00,00020%
Above ₹10,00,00030%

Old-regime basic exemption is ₹3L for seniors (60–80) and ₹5L for super-seniors (80+). Add 4% cess.

Pick the NEW regime if

  • You have few deductions or investments
  • You want the ₹12L nil-tax benefit
  • You prefer simpler, lower flat slabs
  • You don't pay rent / have no home loan

Pick the OLD regime if

  • You max out 80C/80D and other deductions
  • You claim large HRA or home-loan interest
  • Your deductions exceed the new-regime saving
  • You have significant Chapter VI-A claims

Not sure which regime saves you more?

Compare Old vs New →
Which form?

ITR Forms — Who Files Which

An Income Tax Return (ITR) is your annual declaration of income, deductions and tax paid, filed on incometax.gov.in — usually due by 31 July of the assessment year. Pick the form that matches your income:

ITR FormWho Should File
ITR-1 (Sahaj)Resident individual · salary/pension + one house property + other sources · total income up to ₹50L
ITR-2Individuals/HUFs with capital gains but no business income
ITR-3Individuals/HUFs with business or professional income
ITR-4 (Sugam)Presumptive taxation (44AD/44ADA/44AE) · income up to ₹50L
ITR-5 / 6 / 7Firms/LLPs/AOPs · companies · trusts & specified entities

Filing is mandatory once income exceeds the basic exemption limit, and in specified cases (refunds, foreign assets, large deposits) even at zero tax.

Must you file?

When Filing Is Mandatory

  • Total income exceeds the basic exemption limit
  • You want a TDS refund
  • You hold foreign assets or foreign income
  • Bank deposits over ₹1 crore in the year
  • Foreign travel spend over ₹2 lakh
  • Electricity bills over ₹1 lakh
  • You are a company or firm (always)
  • You have carry-forward losses to preserve
Zero tax does not always mean no filing

Under the new regime a salaried person up to ~₹12.75 lakh pays no tax, but filing an ITR can still be mandatory — e.g. to claim a TDS refund, if you hold foreign assets, or if you cross the specified high-value transaction thresholds. When in doubt, file.

Government sourcesSlabs, forms & e-filing: incometax.gov.in · CBDT / Department of Revenue: incometaxindia.gov.in · New-regime slabs & 87A rebate: Union Budget 2025 (Finance Act 2025) · Law: Income-tax Act, 2025 (in force from AY 2026-27)
People also ask

Frequently Asked Questions

Basics
What is income tax in India?
Income tax is a direct tax the central government levies on the income earned by individuals, HUFs, companies, firms and other entities in a financial year. It is governed by the Income-tax Act, 2025 (the consolidated successor to the 1961 Act) and administered by the CBDT under the Ministry of Finance. Income from salary, business, house property, capital gains and other sources is added up, deductions are subtracted, and tax is computed on the net figure using the applicable slab rates.
What is the difference between financial year and assessment year?
The financial year (FY) is the year in which you earn income — e.g. 1 April 2025 to 31 March 2026 is FY 2025-26. The assessment year (AY) is the following year in which that income is assessed and taxed — AY 2026-27. Your ITR for FY 2025-26 is filed in AY 2026-27, generally by 31 July 2026.
Who has to pay income tax in India?
Any person — resident or non-resident — whose taxable income exceeds the basic exemption limit must pay income tax. This includes individuals, HUFs, companies, firms, LLPs, AOPs and BOIs. For individuals under the new regime, the basic exemption is ₹4 lakh, and the 87A rebate means no tax up to ₹12 lakh taxable income.
What are the five heads of income?
Income is classified under five heads: (1) Salaries, (2) Income from House Property, (3) Profits and Gains of Business or Profession, (4) Capital Gains, and (5) Income from Other Sources. Total income is the sum across all heads after set-off of eligible losses.
Slabs & Regimes
What are the new regime income tax slabs for FY 2025-26?
For AY 2026-27 under the default new regime: up to ₹4 lakh Nil; ₹4–8 lakh 5%; ₹8–12 lakh 10%; ₹12–16 lakh 15%; ₹16–20 lakh 20%; ₹20–24 lakh 25%; above ₹24 lakh 30%. A 4% Health & Education Cess is added, plus surcharge above ₹50 lakh (capped at 25%).
Is income really tax-free up to ₹12.75 lakh?
For salaried individuals, effectively yes under the new regime for FY 2025-26. The Section 87A rebate makes tax NIL up to ₹12 lakh of taxable income, and salary income also gets a ₹75,000 standard deduction — so gross salary up to about ₹12.75 lakh can attract zero tax. Above that, the rebate stops and normal slab tax applies.
What are the old regime income tax slabs?
Under the optional old regime: up to ₹2.5 lakh Nil; ₹2.5–5 lakh 5%; ₹5–10 lakh 20%; above ₹10 lakh 30%, plus 4% cess. The basic exemption is ₹3 lakh for senior citizens (60–80) and ₹5 lakh for super-senior citizens (80+). The 87A rebate applies up to ₹5 lakh taxable income, and Chapter VI-A deductions like 80C and 80D are available.
Which is better — old or new tax regime?
It depends on your deductions. The new regime (default) has lower rates but almost no deductions and is better if you invest or claim little. The old regime keeps 80C, 80D, HRA and home-loan interest, so it can win if your total deductions are large. Compare both using our old vs new regime calculator before you choose.
What is the Section 87A rebate?
Section 87A gives a rebate that reduces your tax to nil if taxable income is within a limit — up to ₹12 lakh under the new regime for FY 2025-26, and up to ₹5 lakh under the old regime. The rebate applies to residents only and is available before adding cess. Marginal relief keeps tax reasonable just above the ₹12 lakh new-regime limit.
What is the standard deduction for FY 2025-26?
The standard deduction on salary and pension income is ₹75,000 under the new regime and ₹50,000 under the old regime. It is a flat deduction that needs no proof and is the main reason a salaried person can be tax-free up to about ₹12.75 lakh under the new regime.
Calculation
How is income tax calculated in India?
Add income from all five heads to get Gross Total Income; subtract eligible deductions to get Net Taxable Income; apply the old or new regime slab rates; add surcharge (if income exceeds ₹50 lakh) and 4% Health & Education Cess; subtract the Section 87A rebate. Finally subtract TDS and advance tax already paid — the balance is payable, or the excess is a refund.
What is Health and Education Cess?
Health and Education Cess is an additional 4% charged on the income tax (plus surcharge, if any). It funds health and education initiatives and applies under both the old and new regimes, added after the slab tax and the 87A rebate are computed.
What is the surcharge on income tax?
Surcharge is an extra levy on high incomes: broadly 10% above ₹50 lakh, 15% above ₹1 crore, 25% above ₹2 crore and 37% above ₹5 crore under the old regime. In the new regime the highest surcharge is capped at 25%. Surcharge is calculated on the tax amount, and marginal relief prevents an unfair jump at each threshold.
ITR & Filing
What is an Income Tax Return (ITR)?
An ITR is your annual declaration to the Income Tax Department of income earned, deductions claimed and tax paid during the financial year, filed on incometax.gov.in. For most individuals the due date is 31 July of the assessment year (31 July 2026 for FY 2025-26). Filing is mandatory once income crosses the basic exemption limit, and in specified cases even at zero tax.
Which ITR form should I file?
Salaried individuals with income up to ₹50 lakh from salary, one house property and other sources file ITR-1 (Sahaj). Those with capital gains file ITR-2; business or professional income uses ITR-3; presumptive taxpayers use ITR-4 (Sugam). Firms, LLPs, companies and trusts use ITR-5, ITR-6 or ITR-7.
Is filing ITR mandatory if my tax is zero?
Sometimes yes. Even if the 87A rebate makes your tax nil, filing is mandatory if your income exceeds the basic exemption limit, or in specified cases — to claim a TDS refund, if you hold foreign assets or income, or if you cross high-value thresholds such as bank deposits over ₹1 crore, foreign travel over ₹2 lakh or electricity bills over ₹1 lakh. When in doubt, file.
What is PAN and why do I need it?
PAN (Permanent Account Number) is a unique 10-character alphanumeric ID issued by the Income Tax Department. It is mandatory for filing an ITR, paying tax, opening bank accounts, and for most high-value financial transactions. Your PAN links all your tax records and must be quoted on your return and Form 26AS/AIS.
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