The identifiers, filing requirements, and form selection decisions that every Indian taxpayer must get right before anything else.
The first step in filing an Indian income tax return is determining what form to use. Unlike the US, where most filers use Form 1040 and add schedules as needed, India has separate ITR forms for different categories of taxpayers. Choosing the wrong form leads to processing delays, defective return notices, and potentially scrutiny.
This lesson covers the foundational identification and classification decisions: PAN and Aadhaar (the identifiers that drive all tax compliance in India), the determination of who must file an ITR, the seven ITR forms and which applies to which type of taxpayer, and the basic concepts that flow through every subsequent lesson — Previous Year vs Assessment Year, residential status (the topic of Lesson 2), and the choice between Old and New Tax Regimes (which gets full treatment in Lesson 5).
This lesson assumes you're an individual filer (HUF and other entities are mentioned but not the focus). The curriculum throughout focuses on individuals.
Indian tax uses several terms that may be unfamiliar to filers from elsewhere. "Previous Year" or "PY" is the financial year in which income is earned (e.g., FY 2025-26 = PY 2025-26). "Assessment Year" or "AY" is the year following the PY, when tax is assessed and filed (e.g., FY 2025-26 corresponds to AY 2026-27). "Assessee" means a taxpayer. "ITR" means Income Tax Return. "TDS" means Tax Deducted at Source — the equivalent of US withholding but much broader. "DTAA" means Double Taxation Avoidance Agreement — bilateral tax treaty.
Two identifiers underpin every aspect of Indian income tax compliance: Permanent Account Number (PAN) and Aadhaar. Without these, you cannot file an ITR, claim refunds, or conduct most financial transactions.
PAN (Permanent Account Number). A 10-character alphanumeric identifier issued by the Income Tax Department. Format: 5 letters, 4 digits, 1 letter (e.g., ABCDE1234F). The fourth letter indicates the type of holder — "P" for individual, "C" for company, "H" for HUF, "F" for firm, etc.
Here's what a PAN card looks like and what each part tells you:
Who needs PAN.
Applying for PAN. Online through NSDL (now Protean eGov) or UTIITSL portals. Documents required: identity proof, address proof, date of birth proof. Standard processing takes 15-20 days; e-PAN (instant) available through Income Tax Department's portal for those with Aadhaar.
Aadhaar. A 12-digit unique identification number issued by UIDAI based on biometric and demographic data. Universal among Indian residents.
PAN-Aadhaar linkage — mandatory. Since 2017, every PAN holder must link their PAN to their Aadhaar. PANs not linked become inoperative — meaning you cannot file ITRs, claim refunds, conduct major financial transactions, and TDS is deducted at higher rates (20% or more on payments to you).
Restoring an inoperative PAN. Pay a late fee of ₹1,000 and complete the linkage. Once linked, PAN becomes operative again.
Exceptions to PAN-Aadhaar linkage.
Why both are needed for ITR. Filing an ITR requires PAN as the primary identifier. Aadhaar is needed for e-verification (Aadhaar OTP — the most common verification method). Linking is required before either can be used effectively.
Sourcing. Section 139A of Income Tax Act 1961; CBDT Notification on PAN-Aadhaar linkage; Income Tax Department portal.
This terminology distinction is foundational to Indian tax and trips up new filers regularly.
Previous Year (PY) or Financial Year (FY). The 12-month period in which income is earned. Indian financial year runs April 1 to March 31. So FY 2025-26 means April 1, 2025 to March 31, 2026.
Assessment Year (AY). The 12-month period immediately following the Previous Year, during which the income is assessed and the ITR is filed. AY 2026-27 corresponds to FY 2025-26.
Here's how the dates align:
Practical example. If you earned salary, business income, capital gains, etc. between April 1, 2025 and March 31, 2026, you file your return in AY 2026-27 — typically by July 31, 2026. The income earned is from FY 2025-26 / PY 2025-26 / "previous year" in tax terminology.
Why the distinction matters.
Filing deadlines for AY 2026-27 (FY 2025-26 income).
| Category | Deadline |
|---|---|
| Individuals and HUFs not subject to audit | July 31, 2026 |
| Taxpayers subject to audit under section 44AB | October 31, 2026 |
| Taxpayers required to file Transfer Pricing Report (Form 3CEB) | November 30, 2026 |
| Belated returns (with late fee) | Up to December 31, 2026 |
| Updated returns (with additional tax) | Up to 4 years from end of relevant AY (i.e., March 31, 2030 for AY 2026-27) |
Sourcing. Sections 2(34) and 2(9) of Income Tax Act 1961; Section 139 (return filing); CBDT extension notifications.
Filing is required in many situations beyond just having income above the basic exemption limit.
Income-based filing requirement.
Total income exceeds ₹4 lakh
Under Old Regime.
"Total income" for this purpose is computed before claiming most deductions under Chapter VI-A (80C through 80U) but after standard deduction and certain other deductions.
Filing required regardless of income — specified transactions.
Even if income is below the basic exemption limit, ITR filing is mandatory if you:
Resident with foreign assets. Any resident (not RNOR, not NR) holding foreign assets or signing authority on foreign accounts must file ITR regardless of income level — and must use ITR-2 or ITR-3 (not the simplified ITR-1 or ITR-4).
Why file even when not required.
Sourcing. Section 139(1) of Income Tax Act 1961; if you opt for the new tax regime in FY 2025-26, then, the threshold for filing ITR is Rs.4 lakhs; CBDT notification on specified transactions requiring ITR filing.
ITR-1, also called Sahaj (meaning "simple"), is the most commonly used form for resident salaried individuals with straightforward income.
Here's the structure of ITR-1 — what sections you'll be filling and where each piece of information goes:
Eligibility for ITR-1.
You can use ITR-1 if you're a Resident Individual (not RNOR or NR) with total income up to ₹50 lakh, where income consists of:
Who CANNOT use ITR-1.
You cannot use ITR-1 if you:
Taxpayers earning long-term capital gains from listed equity shares or equity mutual funds under Section 112A can now file using ITR-1 or ITR-4, provided their LTCG does not exceed ₹1,25,000 and they do not have any carry-forward capital losses. Previously, any capital gains forced filers into ITR-2 or ITR-3. This change reduces compliance burden for small equity investors.
What ITR-1 includes (the form structure).
Sourcing. Section 139 of Income Tax Act 1961; CBDT Notification on ITR forms for AY 2025-26; ITR-1 (Sahaj) is designed for resident individuals whose income sources are straightforward and limited.
ITR-2 is for individuals and HUFs who don't have business or professional income but have more complex income situations than ITR-1 can accommodate.
ITR-2 contains many more schedules than ITR-1 — here's the schedule structure:
Eligibility for ITR-2.
Use ITR-2 if you're an Individual or HUF with income from any of the following (and NO business/professional income):
ITR-2 also required if you:
Key situations forcing ITR-2 instead of ITR-1.
What ITR-2 includes (additional sections vs ITR-1).
Sourcing. Section 139 of Income Tax Act 1961; CBDT Notification on ITR forms for AY 2025-26.
ITR-3 is for individuals and HUFs with income from business or profession under regular accounting (not presumptive).
Eligibility for ITR-3.
Use ITR-3 if you're an Individual or HUF with income from:
Common situations requiring ITR-3.
Key features of ITR-3.
Sourcing. Section 139 of Income Tax Act 1961; Sections 44AB, 44AD, 44ADA, 44AE for audit and presumptive thresholds.
ITR-4, called Sugam (meaning "easy"), is for taxpayers under presumptive taxation schemes — a simplified income computation method for small businesses and professionals.
Eligibility for ITR-4.
You can use ITR-4 if you're a Resident Individual, HUF, or Firm (other than LLP) with:
Total income limit: ₹50 lakh.
Presumptive taxation concept.
Who CANNOT use ITR-4.
Once you opt for presumptive under 44AD and then later choose to use regular books, you cannot opt back into presumptive for 5 subsequent years. This makes the in/out decision consequential.
Sourcing. Sections 44AD, 44ADA, 44AE of Income Tax Act 1961; CBDT Notification on ITR forms for AY 2025-26; the presumptive taxation scheme is designed to give relief to small taxpayers from the burden of maintaining books of accounts with a turnover not exceeding Rs.2 crore (Rs.3 crore in special cases).
Non-residents face restricted ITR form choices and additional disclosure requirements.
Non-Resident filers.
RNOR (Resident but Not Ordinarily Resident) filers.
Residents with foreign assets.
Residents with foreign income.
Sourcing. Section 6 of Income Tax Act 1961 (residential status); Section 90 (DTAA); Black Money Act 2015; CBDT Notification on ITR forms.
While this curriculum focuses on individuals, brief overview of entity forms helps individuals understand which form their firm/company files (and what they receive from it).
ITR-5. For firms, LLPs, AOPs (Association of Persons), BOIs (Body of Individuals), local authorities, artificial juridical persons, business trusts, and investment funds. NOT for individuals, HUFs, companies, or those claiming exemption under Section 11.
ITR-6. For companies (other than those claiming exemption under Section 11). All companies file ITR-6 electronically with digital signature.
ITR-7. For persons including companies required to furnish return under Section 139(4A) to 139(4F) — generally trusts, political parties, scientific research organizations, news agencies, universities, and similar specified entities.
Partners receive from firm. Partners in partnership firms receive a share of profit (exempt from tax in their hands since taxed at the firm), plus remuneration and interest from the firm (taxable as business income). They file ITR-3 individually.
Shareholders receive from company. Shareholders receive dividends (taxable in hands of recipient as Income from Other Sources at slab rates). They file the appropriate individual ITR based on their other income.
LLP partners receive from LLP. Similar to partnership firm partners — share of profit exempt, remuneration/interest taxable as business income, file ITR-3.
Sourcing. Sections 139(4A) to 139(4F) of Income Tax Act 1961; CBDT Notification on ITR forms.
Indian tax law classifies all income into five "heads" — categories with their own computation rules. Understanding these heads is essential because each ITR form expects you to compute income under each applicable head separately.
Gross Total Income. Sum of income under all five heads after applicable head-level deductions and loss adjustments.
Total Income. Gross Total Income minus Chapter VI-A deductions (under Old Regime) minus rebate under Section 87A. Tax is calculated on Total Income.
Sourcing. Sections 14-59 of Income Tax Act 1961 (heads of income); Section 80A et seq (deductions).
A critical choice every filer must make: Old Regime or New Regime. This gets full treatment in Lesson 5, but a brief overview is necessary in Lesson 1 since the regime choice affects every subsequent calculation.
New Regime (default for FY 2025-26). Lower tax slab rates but most deductions and exemptions disallowed. The new tax regime is the default tax regime for FY 2025-26, as per the provisions of section 115BAC of the Income Tax Act, 1961.
Slab rates under New Regime (FY 2025-26).
| Income Range | Tax Rate |
|---|---|
| Up to ₹4 lakh | Nil |
| ₹4 lakh to ₹8 lakh | 5% |
| ₹8 lakh to ₹12 lakh | 10% |
| ₹12 lakh to ₹16 lakh | 15% |
| ₹16 lakh to ₹20 lakh | 20% |
| ₹20 lakh to ₹24 lakh | 25% |
| Above ₹24 lakh | 30% |
Individual tax payers who opt for the new tax regime and have annual taxable income of up to Rs. 12 lakh will be eligible for 100% tax rebate up to Rs. 60,000. Such individuals are eligible for a standard deduction of Rs. 75,000 annually.
A salaried individual under the New Regime pays zero income tax up to ₹12.75 lakh total income (₹12 lakh taxable + ₹75,000 standard deduction). This is a major change from Budget 2025.
Old Regime. Original tax structure with higher slab rates but many deductions and exemptions available.
Slab rates under Old Regime (FY 2025-26, unchanged from prior years).
For individuals under 60:
For Senior Citizens (60-79): basic exemption ₹3 lakh
For Super Senior Citizens (80+): basic exemption ₹5 lakh
Rebate under Section 87A (Old Regime). Up to ₹12,500 for income up to ₹5 lakh, effectively making income up to ₹5 lakh tax-free.
Surcharge and cess. Apply to both regimes.
Switching between regimes.
Which is better. Depends on the level of deductions you can claim. Roughly:
Sourcing. Section 115BAC of Income Tax Act 1961; Finance Act 2025; the Budget 2025 proposed new tax slab rates under section 115BAC i.e., the New Tax Regime or the Default Tax Regime.
Filing an ITR is a two-step process: submission and verification. The return is not considered filed until verification is complete.
E-filing on Income Tax portal. All ITRs must be filed electronically through incometax.gov.in (the e-filing portal). The portal supports:
Pre-filled data. The portal pre-fills many fields from Form 26AS, AIS (Annual Information Statement), TIS (Taxpayer Information Summary), and previous ITRs. Always verify pre-filled data — discrepancies can cause issues.
Verification methods.
After filing, verify within 30 days using any of:
ITR not verified within 30 days is treated as invalid — meaning the return is not filed for legal purposes. If the filing deadline has passed, late filing penalties may apply. Verify immediately after filing.
Sourcing. Section 139 of Income Tax Act 1961; CBDT Notification on verification methods; Income Tax Department portal documentation.
Gathering the right documents before starting your ITR speeds up filing and reduces errors.
For all filers.
For salaried filers.
For house property income.
For capital gains.
For business or profession.
For deductions (Old Regime).
For other income.
For foreign income/assets (if applicable).
Sourcing. Income Tax Department guidance on filing; Form 26AS user guide.
Key Takeaways
What does 'Assessment Year 2026-27' refer to?