Introduction to Income Tax Act
Unit I • Direct Taxation Foundations
Introduction to Income Tax
The Income-tax Act, 1961 from first principles — the definitions, the basis of charge, residential status, the five heads of income, key exemptions under Section 10, and how a 2,300-year-old treatise on statecraft still echoes through the modern tax code.
From Kautilya's treatise on statecraft to the modern Income-tax Act — the underlying questions have barely changed
I. The Income-tax Act, 1961 — An Overview
Income tax in India is levied under the Income-tax Act, 1961, which came into force on 1 April 1962 and remains the governing law for income earned up to FY 2025-26 (Assessment Year 2026-27). The Act is administered by the Central Board of Direct Taxes (CBDT) under the Department of Revenue, Ministry of Finance, and is supplemented every year by the Finance Act, which prescribes the applicable rates of tax.
A new Income-tax Act, 2025 has been enacted and comes into force from 1 April 2026, applying prospectively to income earned from FY 2026-27 (referred to as "Tax Year 2026-27") onwards. Returns for AY 2026-27 and all earlier years continue to be governed entirely by the 1961 Act, which is why this unit — like current filings — uses the familiar terms "Assessment Year" and "Previous Year."
II. Key Definitions
Person [Section 2(31)]
"Person" is defined inclusively and covers seven categories: (i) an individual, (ii) a Hindu Undivided Family (HUF), (iii) a company, (iv) a firm, (v) an Association of Persons (AOP) or a Body of Individuals (BOI), whether incorporated or not, (vi) a local authority, and (vii) every artificial juridical person not falling within any of the preceding categories.
Assessee [Section 2(7)]
An "assessee" is a person by whom any tax or other sum of money is payable under the Act. The definition also extends to: a person in respect of whom any proceeding has been taken for the assessment of their income (or of the income of another person for which they are assessable, or of a loss/refund due to them); a person who is deemed to be an assessee under any provision of the Act (a "deemed assessee"); and a person who is deemed to be an "assessee in default" — for instance, for failing to deduct or deposit tax at source.
Income [Section 2(24)]
"Income" is also defined inclusively rather than exhaustively, and covers: profits and gains; dividends; voluntary contributions received by a trust; the value of any perquisite or profit in lieu of salary; capital gains chargeable under Section 45; winnings from lotteries, crossword puzzles, races, card games, and similar activities; and several other specified receipts. Because the definition is inclusive, courts have consistently held that "income" carries a wider meaning than its ordinary, everyday sense.
Gross Total Income [Section 80B(5)]
Gross Total Income (GTI) is the aggregate of income computed under each of the five heads of income, after adjusting for any permissible set-off and carry-forward of losses, but before allowing the deductions available under Chapter VI-A (Sections 80C to 80U). Total Income (the figure actually taxed) is arrived at by deducting the Chapter VI-A deductions from the Gross Total Income.
III. Agricultural Income [Section 2(1A)]
Agricultural income is fully exempt from income tax under Section 10(1), on the constitutional basis that taxation of agricultural income falls within the legislative domain of the States rather than the Union. Section 2(1A) defines it to cover three limbs:
- Rent or revenue derived from land situated in India and used for agricultural purposes.
- Income derived from such land through agriculture itself, or through a process ordinarily employed by a cultivator to render the produce fit for the market, or through the sale of such produce.
- Income from a farmhouse, subject to specified conditions regarding its location and its necessity to the agricultural operations carried out on the land.
Although fully exempt, agricultural income is still relevant for tax computation: where an individual has substantial non-agricultural income (above the basic exemption limit) alongside agricultural income exceeding ₹5,000, agricultural income is included only for the limited purpose of determining the tax rate to be applied to the non-agricultural income — a method known as the "partial integration" of agricultural income.
IV. Previous Year and Assessment Year
| Term | Meaning |
|---|---|
| Previous Year [Sec. 2(34) & 3] | The financial year (1 April to 31 March) in which income is actually earned. For a newly set-up business or profession, the previous year begins on the date of setting up and ends with that financial year. |
| Assessment Year [Sec. 2(9)] | The financial year immediately following the previous year, in which the income of the previous year is assessed and taxed. For income earned in FY 2025-26, the Assessment Year is 2026-27. |
As a rule, income is taxed in the Assessment Year following the Previous Year in which it is earned. Certain exceptions exist where income is assessed in the same year it is earned (for example, income of a person leaving India permanently, or of a business that is discontinued during the year), so as to protect the interests of revenue collection.
V. Basis of Charge [Section 4]
Section 4 is the charging section of the Act. It provides that income tax shall be charged for any assessment year at the rate(s) prescribed by the Finance Act of that year, in respect of the total income of the previous year of every person. Tax is deducted at source, or paid in advance, wherever the Act so provides, in accordance with the relevant provisions.
The charge under Section 4 rests on four foundational elements: there must be a person; that person must have income; the income must relate to the relevant previous year; and the income must be taxed at the rate(s) prescribed for the corresponding assessment year.
VI. Residential Status of an Individual [Section 6]
Residential status — not citizenship — determines how much of a person's income India can tax. It is determined afresh for every previous year, based mainly on the number of days of physical presence in India.
Step 1 — Basic Conditions (to become "Resident")
An individual is a Resident for a previous year if either of the following is satisfied:
- They are in India for 182 days or more during the previous year; or
- They are in India for 60 days or more during the previous year, and for 365 days or more during the four years immediately preceding it.
If neither condition is met, the individual is a Non-Resident (NR) for that year, and only their India-sourced income is taxable in India.
Special relaxation of the 60-day condition
- For an Indian citizen leaving India for employment abroad, or as a crew member of an Indian ship: the "60 days" condition is replaced by 182 days.
- For an Indian citizen or Person of Indian Origin (PIO) visiting India, whose total income (other than foreign-source income) exceeds ₹15 lakh: the "60 days" condition is replaced by 120 days.
Step 2 — Additional Conditions (Resident and Ordinarily Resident, or Not)
A Resident individual is further classified as Resident and Ordinarily Resident (ROR) only if both additional conditions under Section 6(6) are satisfied:
- Resident in India in at least 2 out of the 10 previous years immediately preceding the relevant previous year; and
- Present in India for 730 days or more during the 7 years immediately preceding the relevant previous year.
If either condition fails, the individual is classified as Resident but Not Ordinarily Resident (RNOR). An RNOR (and an NR) is taxed in India only on income received, accrued, or arising in India; an ROR is taxed on their worldwide income.
VII. Different Heads of Income [Section 14]
For computation purposes, all income is classified under five heads. Every source of income must fall under one, and only one, of these heads:
| Head | Covers |
|---|---|
| A. Salaries | Income from an employer-employee relationship — wages, allowances, perquisites, and profits in lieu of salary. |
| B. Income from House Property | Annual value of property (building or land appurtenant to it) owned by the assessee, other than property used for their own business or profession. |
| C. Profits and Gains of Business or Profession | Income earned from carrying on any trade, commerce, manufacture, or profession. |
| D. Capital Gains | Profit arising from the transfer of a capital asset. |
| E. Income from Other Sources | Any income not falling under the first four heads — e.g., interest, dividends, family pension, winnings from lotteries. |
VIII. Exempted Incomes under Section 10
Section 10 lists incomes that are wholly or partly excluded from total income altogether — distinct from a Chapter VI-A "deduction," which first includes the income and then subtracts an eligible amount. Some of the most commonly encountered exemptions are:
| Section | Exemption |
|---|---|
| 10(1) | Agricultural income |
| 10(5) | Leave Travel Allowance/Assistance (LTA), for travel within India, subject to conditions |
| 10(10) | Gratuity received on retirement, subject to prescribed limits |
| 10(10AA) | Leave encashment on retirement, subject to prescribed limits |
| 10(10D) | Sum received under a life insurance policy, including bonus, subject to conditions |
| 10(13A) | House Rent Allowance (HRA), to the extent prescribed by Rule 2A |
| 10(16) | Scholarships granted to meet the cost of education |
| 10(34A)/10(38) etc. | Certain specified capital receipts and income of specified categories of persons/entities |
IX. Fundamentals of Arthashastra in Modern Taxation
Long before the Income-tax Act, 1961, Kautilya's Arthashastra (circa 4th century BCE) laid out a detailed treatise on statecraft, economics, and public finance for the Mauryan empire — and much of its thinking on taxation still resonates in the principles behind the modern Act.
- Taxation as a fair exchange, not extraction: Kautilya famously compared the king's collection of taxes to a bee gathering nectar from a flower — taking enough to sustain the state, without damaging the source. This is echoed in the modern principle that tax policy must balance revenue needs against the taxpayer's capacity to pay and continue producing income.
- Ability-to-pay and proportionality: The Arthashastra prescribed differing rates of the king's share (bhaga, typically around one-sixth of produce) depending on the fertility of land and the taxpayer's circumstances — an early articulation of the same graduated, ability-based approach reflected in today's slab-rate taxation and exemption thresholds.
- Taxation in exchange for protection: Kautilya framed tax as the price of the security and order the state provides to its subjects — a social-contract justification for taxation that still underlies the modern rationale for compulsory, non-quid-pro-quo levies enforced by the state.
- Diversity of levies: The Arthashastra describes multiple distinct heads of state revenue — land revenue, customs duties (shulka), tolls, and levies on specific trades and professions — conceptually similar to how the modern Act separates income into distinct heads (salary, house property, business, capital gains, other sources) for more precise and equitable computation.
- Administrative discipline and record-keeping: Kautilya placed heavy emphasis on accurate accounts, honest officials, and audit of revenue collectors — a precursor to the modern framework of assessments, audits, TDS reconciliation, and penalties for tax evasion or misreporting.
Reading the Arthashastra alongside the Income-tax Act is a reminder that the underlying questions of taxation — how much to collect, from whom, and in fair exchange for what — are far older than any single statute, even as the specific mechanics have been rewritten many times over.
This post is intended for educational purposes as introductory theory notes and reflects provisions applicable for Assessment Year 2026-27 under the Income-tax Act, 1961. Please refer to incometax.gov.in and the relevant Finance Act for authoritative and updated provisions before relying on this content for compliance or filing purposes.
No comments